More than 200 research papers on the molecular phylogeny and phylogenetic biogeography ofbryophytes have been published since the beginning of this millenium. These papers corroborated assumptions of a complex genetic...More than 200 research papers on the molecular phylogeny and phylogenetic biogeography ofbryophytes have been published since the beginning of this millenium. These papers corroborated assumptions of a complex genetic structure of morphologically circumscribed bryophytes, and raised reservations against many morphologically justified species concepts, especially within the mosses. However, many molecular studies allowed for corrections and modifications of morphological classification schemes. Several studies reported that the phylogenetic structure of disjunctly distributed bryophyte species reflects their geographical ranges rather than morphological disparities. Molecular data led to new appraisals of distribution ranges and allowed for the reconstruction of refugia and migration routes. Intercontinental ranges of bryophytes are often caused by dispersal rather than geographical vicariance. Many distribution patterns of disjunct bryophytes are likely formed by processes such as short distance dispersal, rare long distance dispersal events, extinction, recolonization and diversification.展开更多
Symbiotic microbiomes of Sphagnum have been confirmed to play a fundamental role in carbon and nitrogen cycles, however, little is known about microbiomes associated with other bryophytes in subtropical peatland ecosy...Symbiotic microbiomes of Sphagnum have been confirmed to play a fundamental role in carbon and nitrogen cycles, however, little is known about microbiomes associated with other bryophytes in subtropical peatland ecosystems. To explore the differences in community structure, metabolic potential and interaction relationship of bacterial microbiomes associated with different bryophytes species, the gametophytes of three bryophyte species(Sphagnum palustre, Aulacomnium androgynum, and Polytrichum commune) and their underlying peat sediments were collected from the subtropical Dajiuhu Peatland and subjected to Illumina high-throughout sequencing of 16S r RNA gene. Results showed that bacterial diversity was lowest in S. palustre, the dominant moss species, among the three moss species investigated in Dajiuhu Peatland. Bacterial communities from bryophytes clearly separated with those from sediments as indicated by both phylogenetic and taxonomical approaches. Linear discriminant analysis effect size(LEf Se) identified 30 and 36 indicator taxa in mosses and peat sediments. Bacteroidetes, Verrucomicrobia and Thermoleophilia significantly enriched in S. palustre, A. androgynum and P. commune, Chloroflexi, Proteobacteria and Acidobacteria subgroup 6 was indicator taxa for corresponding underlying sediments, respectively. Despite of these differences in compositions, bacterial functional structures were similar among all bryophytes, such as abundant aerobic heterotrophs, rare nitrifiers and denitrifiers. This phenomenon was also observed among the underlying sediments. Network analysis indicated that Proteobacteria and Acidobacteria located in the center of network and exerted strong interactions to other taxa. The sub-network of bacterial communities in sediments was more connected and microbial groups were more competitive than those in bryophytes subnetwork. Our results offer new insight into the community structure, ecological function and interaction pattern of bacterial microbiomes in the Dajiuhu Peatland across different habitats.展开更多
In order to identify the species of bryophytes in Sygara Mountain in Tibet,2390 samples in the area were collected,identified and analyzed. The results show that bryophytes of Sygara Mountain have 26 families,70 gener...In order to identify the species of bryophytes in Sygara Mountain in Tibet,2390 samples in the area were collected,identified and analyzed. The results show that bryophytes of Sygara Mountain have 26 families,70 genera and 134 species; among them,25 families,69 genera and 133 species are mosses,and only one is liverwort,namely Conocephalum conicum( L.) Dum. 4 dominant families are in the descending order of Bryaceae,Dicranaceae,Pottiaceae,Polytrichaceae respectively,and the dominant genera are Hypnum,Brachythecium,Plagiomnium,Racomitrium and Dicranodontium.展开更多
Bases on studies of bryophytes collecled by Cao Tong in August 1997 from North Kolea, 81 species belonging to 52 genera, 26 families of mosses and 16 species belonging to 12 genera, 10 families of hepatics are recorde...Bases on studies of bryophytes collecled by Cao Tong in August 1997 from North Kolea, 81 species belonging to 52 genera, 26 families of mosses and 16 species belonging to 12 genera, 10 families of hepatics are recorded. Among these, 6 rpeciec and 1 form are new to bryoflora of the Korean Peninsula. These are : Campylopus gracilis (Mitt.) Jaeg.,Grimmia leavigata (Brid.) Brid., Okamura hakoniensis f. mutiflagellifera (Okam.) Nog., Orthotrchum erubescens C. Muell.,Scapania verrucosa Heeg., Schistidum strictum (Turn.) Loeske ex O. Maort. and Schistidium subconfertum (Broth.)Deguchi.展开更多
Tropical regions are biodiversity hotspots and are well-suited to explore the potential influence of global climate change on forest ecosystems. Bryophytes have essential ecological functions in tropical forest ecosys...Tropical regions are biodiversity hotspots and are well-suited to explore the potential influence of global climate change on forest ecosystems. Bryophytes have essential ecological functions in tropical forest ecosystems, but knowledge of the potential impact of global warming and possible changes in water availability patterns on terrestrial bryophytes is limited. We transplanted eight terres- trial moss species from two elevations (900 and 500 m) to warmer and drier elevations (500 and 100 m) during a halfyear observation period on Tai Mo Shan, southern China. The simulated climate change resulted in severely declined health status and marked decrease in growth of the trans- planted species when compared with their performance at the original elevations. Five of the eight selected species survived for six months after being transplanted to the warmer and drier lowlands, though their health status deteriorated severely. Sematophyllum subhumile , Pseudotaxiphyllum pohliaecarpum and Brachythecium buchananii were highly susceptible to changes in temperature and rainfall patterns and might be used as suitable bioindicators. As the tropics are expected to become hotter and drier, terrestrial mosses might be negatively affected or even be at risk of extinction. Bryophytes in the tropics could represent one of the best biological communities to reflect the direct adverse impact of climate change and provide early warning of the biological outcomes induced by ongoing climate crisis.展开更多
This article describes how the cartographic depth-to-water (DTW) index in combination with other variables can be used to quantify, model and map the distribution of common forest floor bryophytes, at 1 m resolution. ...This article describes how the cartographic depth-to-water (DTW) index in combination with other variables can be used to quantify, model and map the distribution of common forest floor bryophytes, at 1 m resolution. This was done by way of a case study, using 12 terrain and climate representative locations across New Brunswick, Canada. The presence/absence by moss species was determined at each location along upland-to-wetland transects within >10-m spaced 1-m2 forest floor plots. It was found that Bazzania trilobata, Dicranum polysetum, Polytrichum commune, Hylocomium splendens, and Pleurozium schreberi had greater probabilities of occurrence in well-drained forested areas, whereas Sphagnum fuscum and Sphagnum girgensohnii dominated in low-lying wet areas. The presence/absence of each species was quantified by way of logistic regression analyses, using DTW, slope, canopy closure, forest litter depth, ecosite type (8 classes), nutrient regime (4 classes, poor to rich);vegetation type (deciduous, coniferous, mixed, and shrubs), and macro- and micro-topography (upland, wetland;mounds, pits) as predictor variables. Among these, log10DTW and forest litter depth were the most consistent predictor variables, followed by mound versus pit. For the mapping purpose, only log10DTW and already mapped classifications for upland versus wetland and vegetation type were used to predict the probability of occurrences for the most frequent moss species, namely, D. polysetum, P. schreberi and Sphagnum spp. The overall accuracy for doing this ranged from 67% to 83%, with false positives and negatives amounting to 18% to 42%. The overall classification accuracy exceeded the probability by chance alone at 76.8%, with the significance level reached at 75.3%. The average level of probability by chance alone was 60.3%.展开更多
Slow growth is a bottleneck for the large-scale application of bryophytes in landscaping.The article reviewed the progress of artificial breeding researches,summarized several effective means of collecting germplasm r...Slow growth is a bottleneck for the large-scale application of bryophytes in landscaping.The article reviewed the progress of artificial breeding researches,summarized several effective means of collecting germplasm resources and cultivating and breeding,discussed the feasibility of specialized mosses garden,and proposed the approaches of scale breeding such as stereo-cultivation and optimization of cultivation media.展开更多
In order to study China's bryophyte,this paper uses bibliometrics for statistical analysis of literature about China's bryophyte during 2005-2015.The results show that in terms of published article distributio...In order to study China's bryophyte,this paper uses bibliometrics for statistical analysis of literature about China's bryophyte during 2005-2015.The results show that in terms of published article distribution of different journals,there are 13 kinds of journals with more than 5 papers about bryophyte,accounting for 32.5%; in terms of the number of papers published in different years,it was smallest in 2005,only 16,while it reached the largest number of 33 in 2008; in terms of the number of papers published for different first authors,there are most authors publishing less than 9 papers,accounting for 87.5%,there is only one author publishing 9 papers,and there are 5 people publishing more than 9 papers; in terms of author unit distribution,in the 278 articles collected,there are 12 units publishing papers of less than 6,accounting for 30%,the unit publishing the most papers(36) is Guizhou Normal University,5 units publish 6 papers,accounting for 12.5%,and the units publishing papers of less than 6 account for 57.5%; in terms of literature research level,there are most papers about basic and applied basic research(natural science),accounting for 91.2%,the papers about engineering and technology(natural science) account for 5.5%,and other papers account for 3.3%.展开更多
[Objectives]To study the characteristics of bryophytes in subalpine cold zone and related transition zone.[Methods]The study was divided into scale A and scale B.On the scale of A,specimens were collected from Tongmai...[Objectives]To study the characteristics of bryophytes in subalpine cold zone and related transition zone.[Methods]The study was divided into scale A and scale B.On the scale of A,specimens were collected from Tongmai-Pailong-Dongjiu-Lulang-Sejila Pass-Nyingchi Town-Bagi Village along the national Highway 318.A sample plot was set for each 100 m altitude increase,and samples were collected between each two sample plots as well.On the scale of B,bryophyte specimens were collected and studied in the fixed sample plot of the Tibetan Nyingchi Alpine forest Ecosystem Research Observatory.[Results]Through the sampling and collection of bryophytes in Sejila Mountain,more than 3000 specimens were identified with the classical classification method.There were 216 species of bryophytes belonging to 82 genera and 24 families.The bryophytes in the study area differed obviously in different vegetation types and slopes.The species richness of Sabina saltuaria-Abiesgeorgei var.smithii forest was the highest.Theαdiversity of Abiesgeorgei var.smithii forest was the highest,followed by Sabina saltuaria-Rhododendron forest,and that of alpine shrub was the lowest.Diversity studies showed that theβdiversity of Sabina saltuaria-Rhododendron forest and Rhododendron forest on the eastern slope was the largest,and those of alpine shrub and Sabina saltuaria-Abiesgeorgei var.smithii forest were the lowest.However,theβdiversity of Abiesgeorgei var.smithii forest on the western slope was the highest,and those of alpine shrub and Abiesgeorgei var.smithii forest were the lowest.[Conclusions]There are obvious differences in the distribution of bryophytes on the eastern and western slopes of Sejila Mountain of Tibet.展开更多
Habitat fragmentation in forest ecosystems poses a major threat to biodiversity,disrupting ecological corridors,limiting gene flow,and threatening persistence,especially for forest-dependent species.Among these specie...Habitat fragmentation in forest ecosystems poses a major threat to biodiversity,disrupting ecological corridors,limiting gene flow,and threatening persistence,especially for forest-dependent species.Among these species,woodland specialist bryophytes represent one of the most endangered groups,with Dicranum viride,an epiphytic moss of high conservation value protected under international regulations,exemplifying this conservation concern.Despite its legal status,the factors that influence its genetic connectivity and dispersal potential remain poorly understood.In this study,we integrated molecular analyses based on genome-wide single-nucleotide polymorphism(SNP)markers with spatial modelling,including least-cost path(LCP)analyses and circuit-based connectivity models,to assess the impact of forest continuity and management on the genetic structure and ecological corridors of D.viride across temperate forest ecosystems of Central Europe.Our results revealed a complex dispersal dynamic that combines short-distance clonal propagation with rare long-distance dispersal events.Genetic clustering analyses indicated that long-term forest continuity supports unique genetic lineages.LCP analyses and circuit-based connectivity models demonstrated that naturally regenerating forests(reflecting management regime)and forests with long-term continuity(reflecting habitat age and historical stability)provide dispersal corridors with the highest habitat permeability.Our findings highlight the critical role of long-term habitat stability in maintaining the genetic diversity and population dynamics of D.viride.Conservation strategies should prioritise the protection of mature forests,the maintenance of ecological corridors,and the integration of retention forestry practices to support epiphytic bryophytes.Our study improves the understanding of how landscape connectivity influences the persistence of rare epiphytic bryophytes,offering practical insights for the conservation of biodiversity and sustainable forest management.展开更多
Understanding the underlying mechanisms driving species assembly along elevational gradients is of great interest in ecology and biogeography.The Himalaya is one of the world’s hotspots of biodiversity,and the elevat...Understanding the underlying mechanisms driving species assembly along elevational gradients is of great interest in ecology and biogeography.The Himalaya is one of the world’s hotspots of biodiversity,and the elevational gradient of the central Himalaya in Nepal is one of the longest elevational gradients in the world.Mosses are important constituents of vegetation in the Himalaya,and knowledge of geographic patterns and ecological causes of phylogenetic structure of mosses along elevational gradients in the Himalaya is critical to understanding the assembly of plant diversity in general,and moss diversity in particular,in the Himalaya.Here,we investigate the relationships of phylogenetic structure metrics reflecting different evolutionary depths with elevation and climatic variables representing mean temperature and precipitation conditions,climate extremes,and climate seasonality for mosses distributed along an elevational gradient spanning about 5000 m in the central Himalaya,Nepal.For a given climatic variable,different metrics of phylogenetic structure show different spatial and climatic patterns,but all phylogenetic metrics standardized for species richness show that phylogenetic dispersion in moss assemblages tend to increase with increasing elevation and decreasing temperature.The standardized effect size of mean pairwise distance of moss assemblages shows a triphasic(zig-zag)pattern,which is generally consistent with the triphasic patterns previously found in angiosperms and ferns along the same elevational gradient.Our study shows that temperature-related variables and climate seasonality variables are more important drivers of phylogenetic dispersion in mosses in Nepal,compared with precipitation-related variables and climate extreme variables,respectively.展开更多
Species richness in any area results from the interplay of the processes of speciation,extinction,and dispersal.The relationships between species richness and climate should be considered as an outcome of the effects ...Species richness in any area results from the interplay of the processes of speciation,extinction,and dispersal.The relationships between species richness and climate should be considered as an outcome of the effects of climate on speciation,extinction,and dispersal.Diversificationrate represents the balance of speciation and extinction rates over time.Here,I explore diversificationrates in mosses across geographic and climatic gradients worldwide.Specifically,I investigate latitudinal patterns and climatic associations of the mean diversificationrate of mosses at global,hemispheric,and smaller scales.I findthat the mean diversificationrate of mosses is positively correlated with species richness of mosses,increases with decreasing latitude and increasing mean annual temperature and annual precipitation,and is more strongly associated with mean annual temperature than with annual precipitation.These findingsshed light on variation of species richness in mosses across the world.The negative relationship between species richness and latitude and the positive relationship between species richness and mean diversificationrate in mosses suggest that higher moss species richness at lower latitudes might have resulted,at least to some degree,from higher moss diversificationrates at lower latitudes.展开更多
Exploring the worldwide patterns of endemism and the processes that lead to the formation of highendemism centers is crucial in biogeography.This study examines the geographic distribution and ecological influences on...Exploring the worldwide patterns of endemism and the processes that lead to the formation of highendemism centers is crucial in biogeography.This study examines the geographic distribution and ecological influences on the endemism of liverworts across 390 regions worldwide.We assess phylogenetic endemism and relative phylogenetic endemism in relation to eleven environmental factors,which represent current and Quaternary climate variations,as well as topographic and environmental heterogeneity.Areas with higher endemism in liverworts tend to have higher temperatures,precipitation,and environmental heterogeneity,but lower temperature seasonality and lesser impacts from Quaternary climate changes.Regions exhibiting notably high endemism are predominantly found in tropical Asia,Madagascar,eastern Australia,and the Andes,while those with notably low endemism are generally in temperate Eurasia and North America,parts of Africa,and eastern South America.Centers of neo-endemism are mainly in southern Africa,whereas centers of paleo-endemism are in southern South America,tropical Asia,and New Zealand.Environment variability is a more significant predictor of phylogenetic endemism than current climate conditions,which are themselves more predictive than variables related to Quaternary climate changes.Nevertheless,these three types of explanatory variables combined explain only about one-third of the variance in phylogenetic endemism.展开更多
The non-specific lipid transfer proteins(nsLTPs)are small,basic proteins characterized by a tunnel-like hydrophobic cavity,capable of transferring various lipid molecules between lipid bilayers.Most nsLTPs are synthes...The non-specific lipid transfer proteins(nsLTPs)are small,basic proteins characterized by a tunnel-like hydrophobic cavity,capable of transferring various lipid molecules between lipid bilayers.Most nsLTPs are synthesized with an N-terminal signal peptide that localizes the protein to the apoplastic space.The nsLTPs have only been identified in seed plants,where they are encoded by large gene families.We have initiated an analysis of the evolutionary history of the nsLTP family using genomic and EST information from non-seed land plants and green algae to determine:(1)when the nsLTP family arose,(2)how often new nsLTP subfamilies have been created,and(3)how subfamilies differ in their patterns of expansion and loss in different plant lineages.In this study,we searched sequence databases and found that genes and transcripts encoding nsLTPs are abundant in liverworts,mosses,and all other investigated land plants,but not present in any algae.The tertiary structures of representative liverwort and moss nsLTPs were further studied with homology modeling.The results indicate that the nsLTP family has evolved after plants conquered land.Only two of the four major subfamilies of nsLTPs found in flowering plants are present in mosses and liverworts.The additional subfamilies have arisen later,during land plant evolution.In this report,we also introduce a modified nsLTP classification system.展开更多
Background: The deforestation caused by road construction is one of the main drivers for both biodiversity and function loss in tropical ecosystems. Terricolous cryptogams are pioneers in colonizing roadside and they ...Background: The deforestation caused by road construction is one of the main drivers for both biodiversity and function loss in tropical ecosystems. Terricolous cryptogams are pioneers in colonizing roadside and they are limited by environmental and edaphic factors, thus, cryptogams may act as pioneers for ecosystem rehabilitation at roadside.Methods: This research was aimed at determining the diversity and composition of terricolous cryptogams, as well as their relationship with elevation and soil properties among roadside of the tropical Andes of Ecuador, in order to establish indicator species of this anthropized ecosystems. Five elevations were selected and in each one 50grids of 20 cm×30 cm were sampled(250 in total along the road), where occurrence, cover and identification of every cryptogam species were recorded. To evaluate the effect of elevation and soil properties on cryptogam richness, a linear model was conducted. Species composition among elevations was compared by non-metric multidimensional scaling(NMDS), and their relationship with the environmental variables through a correlation with adjusted axes was performed. A total of 72 species were recorded, those being 44 bryophytes and 28lichens. Species richness and composition of terricolous cryptogams were influenced by elevation and soil properties, thus the richness is higher at elevations E1, E2 and E3(2600, 2200 and 1800 m a.s.l.), differing from low elevations E4 and E5(1400 and 1000 m a.s.l.). Higher elevations with specific soil conditions(e.g bulk density, nitrogen and silt) harbored different cryptogam communities than those in lower elevations.Conclusions: A combination of both elevation and soil properties are shaping the colonization by terricolous cryptogams commnunities. As such, 18 species were identified as the best indicators for all sets of environmental conditions at the roadside, which can therefore be considered for monitoring ecological processes in tropical areas. Use of biocrusts for restoration is an emerging field. If implemented in the study region, elevation and soil drivers may help to better chose the more suitable cryptogam species to manage and stabilize roadside in tropical roads.展开更多
Phylogenetic niche conservatism posits that species tend to retain ancestral ecological traits and distributions,which has been broadly tested for lineages originating in tropical climates but has been rarely tested f...Phylogenetic niche conservatism posits that species tend to retain ancestral ecological traits and distributions,which has been broadly tested for lineages originating in tropical climates but has been rarely tested for lineages that originated and diversified in temperate climates.Liverworts are thought to originate in temperate climates.Mean lineage age reflects evolutionary history of biological communities.Here,using regional liverwort floras across a long latitudinal gradient from tropical to arctic climates in North America,we test the age-component of the temperate niche conservatism hypothesis.Mean genus age(MGA)was estimated for each of 76 regional floras of liverworts.We related MGA to climatic variables for North America as a whole and for its eastern and western parts separately,and used variation partitioning analysis to assess the relative importance of temperature-versus precipitationrelated variables and of climate extremes versus seasonality on MGA.We found that older genera of liverworts tend to concentrate in humid regions of intermediate temperatures in the range of 10℃-20℃,from which liverworts have adapted to and diversified into more arid,colder,and hotter regions,supporting the temperate niche conservatism hypothesis.We also found that across North America the MGA of liverwort assemblages is more strongly affected by precipitation-related variables than by temperature-related variables,and is more strongly affected by climate extremes than by climate seasonality.Geographic patterns of the MGA of liverworts are consistent with the temperate niche conservatism hypothesis,rather than the tropical niche conservatism hypothesis,the latter of which is broadly supported by angiosperms.展开更多
基金support from the German Research Foundation(grants HE 3584/1-4)
文摘More than 200 research papers on the molecular phylogeny and phylogenetic biogeography ofbryophytes have been published since the beginning of this millenium. These papers corroborated assumptions of a complex genetic structure of morphologically circumscribed bryophytes, and raised reservations against many morphologically justified species concepts, especially within the mosses. However, many molecular studies allowed for corrections and modifications of morphological classification schemes. Several studies reported that the phylogenetic structure of disjunctly distributed bryophyte species reflects their geographical ranges rather than morphological disparities. Molecular data led to new appraisals of distribution ranges and allowed for the reconstruction of refugia and migration routes. Intercontinental ranges of bryophytes are often caused by dispersal rather than geographical vicariance. Many distribution patterns of disjunct bryophytes are likely formed by processes such as short distance dispersal, rare long distance dispersal events, extinction, recolonization and diversification.
基金jointly supported by National Natural Science Foundation of China (No. 41572325)China University of Geosciences (Wuhan) (Nos. CUGCJ1703 and CUGQY1922)。
文摘Symbiotic microbiomes of Sphagnum have been confirmed to play a fundamental role in carbon and nitrogen cycles, however, little is known about microbiomes associated with other bryophytes in subtropical peatland ecosystems. To explore the differences in community structure, metabolic potential and interaction relationship of bacterial microbiomes associated with different bryophytes species, the gametophytes of three bryophyte species(Sphagnum palustre, Aulacomnium androgynum, and Polytrichum commune) and their underlying peat sediments were collected from the subtropical Dajiuhu Peatland and subjected to Illumina high-throughout sequencing of 16S r RNA gene. Results showed that bacterial diversity was lowest in S. palustre, the dominant moss species, among the three moss species investigated in Dajiuhu Peatland. Bacterial communities from bryophytes clearly separated with those from sediments as indicated by both phylogenetic and taxonomical approaches. Linear discriminant analysis effect size(LEf Se) identified 30 and 36 indicator taxa in mosses and peat sediments. Bacteroidetes, Verrucomicrobia and Thermoleophilia significantly enriched in S. palustre, A. androgynum and P. commune, Chloroflexi, Proteobacteria and Acidobacteria subgroup 6 was indicator taxa for corresponding underlying sediments, respectively. Despite of these differences in compositions, bacterial functional structures were similar among all bryophytes, such as abundant aerobic heterotrophs, rare nitrifiers and denitrifiers. This phenomenon was also observed among the underlying sediments. Network analysis indicated that Proteobacteria and Acidobacteria located in the center of network and exerted strong interactions to other taxa. The sub-network of bacterial communities in sediments was more connected and microbial groups were more competitive than those in bryophytes subnetwork. Our results offer new insight into the community structure, ecological function and interaction pattern of bacterial microbiomes in the Dajiuhu Peatland across different habitats.
基金Supported by the National Natural Science Foundation of China(No.31640010)Tibet’s Research and Development of Characteristic Agriculture and Animal Husbandry Resources Synergy Innovation Center-Plateau Ecological,Natural Science+3 种基金Technology Foundation of Tibet Autonomous Region(2016ZR-15-41)Tibet Agriculture and Animal Husbandry College Graduate Innovation Projects(YJS2016-05)2016 Young University Teachers Innovation Support Program(QCZ2016-49)Tibet Science and Technology Department-Office for the Institute of Agriculture and Animal Husbandry School Fund(2016ZR-NY-03)
文摘In order to identify the species of bryophytes in Sygara Mountain in Tibet,2390 samples in the area were collected,identified and analyzed. The results show that bryophytes of Sygara Mountain have 26 families,70 genera and 134 species; among them,25 families,69 genera and 133 species are mosses,and only one is liverwort,namely Conocephalum conicum( L.) Dum. 4 dominant families are in the descending order of Bryaceae,Dicranaceae,Pottiaceae,Polytrichaceae respectively,and the dominant genera are Hypnum,Brachythecium,Plagiomnium,Racomitrium and Dicranodontium.
文摘Bases on studies of bryophytes collecled by Cao Tong in August 1997 from North Kolea, 81 species belonging to 52 genera, 26 families of mosses and 16 species belonging to 12 genera, 10 families of hepatics are recorded. Among these, 6 rpeciec and 1 form are new to bryoflora of the Korean Peninsula. These are : Campylopus gracilis (Mitt.) Jaeg.,Grimmia leavigata (Brid.) Brid., Okamura hakoniensis f. mutiflagellifera (Okam.) Nog., Orthotrchum erubescens C. Muell.,Scapania verrucosa Heeg., Schistidum strictum (Turn.) Loeske ex O. Maort. and Schistidium subconfertum (Broth.)Deguchi.
文摘Tropical regions are biodiversity hotspots and are well-suited to explore the potential influence of global climate change on forest ecosystems. Bryophytes have essential ecological functions in tropical forest ecosystems, but knowledge of the potential impact of global warming and possible changes in water availability patterns on terrestrial bryophytes is limited. We transplanted eight terres- trial moss species from two elevations (900 and 500 m) to warmer and drier elevations (500 and 100 m) during a halfyear observation period on Tai Mo Shan, southern China. The simulated climate change resulted in severely declined health status and marked decrease in growth of the trans- planted species when compared with their performance at the original elevations. Five of the eight selected species survived for six months after being transplanted to the warmer and drier lowlands, though their health status deteriorated severely. Sematophyllum subhumile , Pseudotaxiphyllum pohliaecarpum and Brachythecium buchananii were highly susceptible to changes in temperature and rainfall patterns and might be used as suitable bioindicators. As the tropics are expected to become hotter and drier, terrestrial mosses might be negatively affected or even be at risk of extinction. Bryophytes in the tropics could represent one of the best biological communities to reflect the direct adverse impact of climate change and provide early warning of the biological outcomes induced by ongoing climate crisis.
文摘This article describes how the cartographic depth-to-water (DTW) index in combination with other variables can be used to quantify, model and map the distribution of common forest floor bryophytes, at 1 m resolution. This was done by way of a case study, using 12 terrain and climate representative locations across New Brunswick, Canada. The presence/absence by moss species was determined at each location along upland-to-wetland transects within >10-m spaced 1-m2 forest floor plots. It was found that Bazzania trilobata, Dicranum polysetum, Polytrichum commune, Hylocomium splendens, and Pleurozium schreberi had greater probabilities of occurrence in well-drained forested areas, whereas Sphagnum fuscum and Sphagnum girgensohnii dominated in low-lying wet areas. The presence/absence of each species was quantified by way of logistic regression analyses, using DTW, slope, canopy closure, forest litter depth, ecosite type (8 classes), nutrient regime (4 classes, poor to rich);vegetation type (deciduous, coniferous, mixed, and shrubs), and macro- and micro-topography (upland, wetland;mounds, pits) as predictor variables. Among these, log10DTW and forest litter depth were the most consistent predictor variables, followed by mound versus pit. For the mapping purpose, only log10DTW and already mapped classifications for upland versus wetland and vegetation type were used to predict the probability of occurrences for the most frequent moss species, namely, D. polysetum, P. schreberi and Sphagnum spp. The overall accuracy for doing this ranged from 67% to 83%, with false positives and negatives amounting to 18% to 42%. The overall classification accuracy exceeded the probability by chance alone at 76.8%, with the significance level reached at 75.3%. The average level of probability by chance alone was 60.3%.
基金Sponsored by Youth Program of Fundamental Research Funds for the Central Universities of Southwest University for Nationalities(12NZYQN23)Sub-project of Sichuan Sci-tech Enterprises Self-dependent Innovation and Reconstruction Assistance Program(K20110125B)
文摘Slow growth is a bottleneck for the large-scale application of bryophytes in landscaping.The article reviewed the progress of artificial breeding researches,summarized several effective means of collecting germplasm resources and cultivating and breeding,discussed the feasibility of specialized mosses garden,and proposed the approaches of scale breeding such as stereo-cultivation and optimization of cultivation media.
基金Supported by Emergency Management Project of National Natural Science Foundation(31640010)Tibet's Research and Development Project of Characteristic Agriculture and Animal Husbandry Resources Synergy Innovation Center-Plateau Ecology+1 种基金Natural Science Foundation of Tibet Autonomous Region(2016ZR-15-41)Postgraduate Innovation Project of Xizang Agriculture and Animal Husbandry College(YJS2017-01)
文摘In order to study China's bryophyte,this paper uses bibliometrics for statistical analysis of literature about China's bryophyte during 2005-2015.The results show that in terms of published article distribution of different journals,there are 13 kinds of journals with more than 5 papers about bryophyte,accounting for 32.5%; in terms of the number of papers published in different years,it was smallest in 2005,only 16,while it reached the largest number of 33 in 2008; in terms of the number of papers published for different first authors,there are most authors publishing less than 9 papers,accounting for 87.5%,there is only one author publishing 9 papers,and there are 5 people publishing more than 9 papers; in terms of author unit distribution,in the 278 articles collected,there are 12 units publishing papers of less than 6,accounting for 30%,the unit publishing the most papers(36) is Guizhou Normal University,5 units publish 6 papers,accounting for 12.5%,and the units publishing papers of less than 6 account for 57.5%; in terms of literature research level,there are most papers about basic and applied basic research(natural science),accounting for 91.2%,the papers about engineering and technology(natural science) account for 5.5%,and other papers account for 3.3%.
基金Open Project of State Key Laboratory of Vegetation and Environmental Change(LVEC-2020KF01)National Natural Science Foundation of China(32060264).
文摘[Objectives]To study the characteristics of bryophytes in subalpine cold zone and related transition zone.[Methods]The study was divided into scale A and scale B.On the scale of A,specimens were collected from Tongmai-Pailong-Dongjiu-Lulang-Sejila Pass-Nyingchi Town-Bagi Village along the national Highway 318.A sample plot was set for each 100 m altitude increase,and samples were collected between each two sample plots as well.On the scale of B,bryophyte specimens were collected and studied in the fixed sample plot of the Tibetan Nyingchi Alpine forest Ecosystem Research Observatory.[Results]Through the sampling and collection of bryophytes in Sejila Mountain,more than 3000 specimens were identified with the classical classification method.There were 216 species of bryophytes belonging to 82 genera and 24 families.The bryophytes in the study area differed obviously in different vegetation types and slopes.The species richness of Sabina saltuaria-Abiesgeorgei var.smithii forest was the highest.Theαdiversity of Abiesgeorgei var.smithii forest was the highest,followed by Sabina saltuaria-Rhododendron forest,and that of alpine shrub was the lowest.Diversity studies showed that theβdiversity of Sabina saltuaria-Rhododendron forest and Rhododendron forest on the eastern slope was the largest,and those of alpine shrub and Sabina saltuaria-Abiesgeorgei var.smithii forest were the lowest.However,theβdiversity of Abiesgeorgei var.smithii forest on the western slope was the highest,and those of alpine shrub and Abiesgeorgei var.smithii forest were the lowest.[Conclusions]There are obvious differences in the distribution of bryophytes on the eastern and western slopes of Sejila Mountain of Tibet.
基金supported by the Wrocław University of Environmental and Life Sciences(Poland)as the Ph.D.research programme“Bon doktoranta SD UPWr”N020/0002/22.
文摘Habitat fragmentation in forest ecosystems poses a major threat to biodiversity,disrupting ecological corridors,limiting gene flow,and threatening persistence,especially for forest-dependent species.Among these species,woodland specialist bryophytes represent one of the most endangered groups,with Dicranum viride,an epiphytic moss of high conservation value protected under international regulations,exemplifying this conservation concern.Despite its legal status,the factors that influence its genetic connectivity and dispersal potential remain poorly understood.In this study,we integrated molecular analyses based on genome-wide single-nucleotide polymorphism(SNP)markers with spatial modelling,including least-cost path(LCP)analyses and circuit-based connectivity models,to assess the impact of forest continuity and management on the genetic structure and ecological corridors of D.viride across temperate forest ecosystems of Central Europe.Our results revealed a complex dispersal dynamic that combines short-distance clonal propagation with rare long-distance dispersal events.Genetic clustering analyses indicated that long-term forest continuity supports unique genetic lineages.LCP analyses and circuit-based connectivity models demonstrated that naturally regenerating forests(reflecting management regime)and forests with long-term continuity(reflecting habitat age and historical stability)provide dispersal corridors with the highest habitat permeability.Our findings highlight the critical role of long-term habitat stability in maintaining the genetic diversity and population dynamics of D.viride.Conservation strategies should prioritise the protection of mature forests,the maintenance of ecological corridors,and the integration of retention forestry practices to support epiphytic bryophytes.Our study improves the understanding of how landscape connectivity influences the persistence of rare epiphytic bryophytes,offering practical insights for the conservation of biodiversity and sustainable forest management.
文摘Understanding the underlying mechanisms driving species assembly along elevational gradients is of great interest in ecology and biogeography.The Himalaya is one of the world’s hotspots of biodiversity,and the elevational gradient of the central Himalaya in Nepal is one of the longest elevational gradients in the world.Mosses are important constituents of vegetation in the Himalaya,and knowledge of geographic patterns and ecological causes of phylogenetic structure of mosses along elevational gradients in the Himalaya is critical to understanding the assembly of plant diversity in general,and moss diversity in particular,in the Himalaya.Here,we investigate the relationships of phylogenetic structure metrics reflecting different evolutionary depths with elevation and climatic variables representing mean temperature and precipitation conditions,climate extremes,and climate seasonality for mosses distributed along an elevational gradient spanning about 5000 m in the central Himalaya,Nepal.For a given climatic variable,different metrics of phylogenetic structure show different spatial and climatic patterns,but all phylogenetic metrics standardized for species richness show that phylogenetic dispersion in moss assemblages tend to increase with increasing elevation and decreasing temperature.The standardized effect size of mean pairwise distance of moss assemblages shows a triphasic(zig-zag)pattern,which is generally consistent with the triphasic patterns previously found in angiosperms and ferns along the same elevational gradient.Our study shows that temperature-related variables and climate seasonality variables are more important drivers of phylogenetic dispersion in mosses in Nepal,compared with precipitation-related variables and climate extreme variables,respectively.
文摘Species richness in any area results from the interplay of the processes of speciation,extinction,and dispersal.The relationships between species richness and climate should be considered as an outcome of the effects of climate on speciation,extinction,and dispersal.Diversificationrate represents the balance of speciation and extinction rates over time.Here,I explore diversificationrates in mosses across geographic and climatic gradients worldwide.Specifically,I investigate latitudinal patterns and climatic associations of the mean diversificationrate of mosses at global,hemispheric,and smaller scales.I findthat the mean diversificationrate of mosses is positively correlated with species richness of mosses,increases with decreasing latitude and increasing mean annual temperature and annual precipitation,and is more strongly associated with mean annual temperature than with annual precipitation.These findingsshed light on variation of species richness in mosses across the world.The negative relationship between species richness and latitude and the positive relationship between species richness and mean diversificationrate in mosses suggest that higher moss species richness at lower latitudes might have resulted,at least to some degree,from higher moss diversificationrates at lower latitudes.
文摘Exploring the worldwide patterns of endemism and the processes that lead to the formation of highendemism centers is crucial in biogeography.This study examines the geographic distribution and ecological influences on the endemism of liverworts across 390 regions worldwide.We assess phylogenetic endemism and relative phylogenetic endemism in relation to eleven environmental factors,which represent current and Quaternary climate variations,as well as topographic and environmental heterogeneity.Areas with higher endemism in liverworts tend to have higher temperatures,precipitation,and environmental heterogeneity,but lower temperature seasonality and lesser impacts from Quaternary climate changes.Regions exhibiting notably high endemism are predominantly found in tropical Asia,Madagascar,eastern Australia,and the Andes,while those with notably low endemism are generally in temperate Eurasia and North America,parts of Africa,and eastern South America.Centers of neo-endemism are mainly in southern Africa,whereas centers of paleo-endemism are in southern South America,tropical Asia,and New Zealand.Environment variability is a more significant predictor of phylogenetic endemism than current climate conditions,which are themselves more predictive than variables related to Quaternary climate changes.Nevertheless,these three types of explanatory variables combined explain only about one-third of the variance in phylogenetic endemism.
文摘The non-specific lipid transfer proteins(nsLTPs)are small,basic proteins characterized by a tunnel-like hydrophobic cavity,capable of transferring various lipid molecules between lipid bilayers.Most nsLTPs are synthesized with an N-terminal signal peptide that localizes the protein to the apoplastic space.The nsLTPs have only been identified in seed plants,where they are encoded by large gene families.We have initiated an analysis of the evolutionary history of the nsLTP family using genomic and EST information from non-seed land plants and green algae to determine:(1)when the nsLTP family arose,(2)how often new nsLTP subfamilies have been created,and(3)how subfamilies differ in their patterns of expansion and loss in different plant lineages.In this study,we searched sequence databases and found that genes and transcripts encoding nsLTPs are abundant in liverworts,mosses,and all other investigated land plants,but not present in any algae.The tertiary structures of representative liverwort and moss nsLTPs were further studied with homology modeling.The results indicate that the nsLTP family has evolved after plants conquered land.Only two of the four major subfamilies of nsLTPs found in flowering plants are present in mosses and liverworts.The additional subfamilies have arisen later,during land plant evolution.In this report,we also introduce a modified nsLTP classification system.
基金funded by Universidad Tecnica Particular de Loja(UTPL-PROY_INV_CCBIO_2020_2773 and research scholarship Ⅰ-Ⅱ-Ⅲ CONV).
文摘Background: The deforestation caused by road construction is one of the main drivers for both biodiversity and function loss in tropical ecosystems. Terricolous cryptogams are pioneers in colonizing roadside and they are limited by environmental and edaphic factors, thus, cryptogams may act as pioneers for ecosystem rehabilitation at roadside.Methods: This research was aimed at determining the diversity and composition of terricolous cryptogams, as well as their relationship with elevation and soil properties among roadside of the tropical Andes of Ecuador, in order to establish indicator species of this anthropized ecosystems. Five elevations were selected and in each one 50grids of 20 cm×30 cm were sampled(250 in total along the road), where occurrence, cover and identification of every cryptogam species were recorded. To evaluate the effect of elevation and soil properties on cryptogam richness, a linear model was conducted. Species composition among elevations was compared by non-metric multidimensional scaling(NMDS), and their relationship with the environmental variables through a correlation with adjusted axes was performed. A total of 72 species were recorded, those being 44 bryophytes and 28lichens. Species richness and composition of terricolous cryptogams were influenced by elevation and soil properties, thus the richness is higher at elevations E1, E2 and E3(2600, 2200 and 1800 m a.s.l.), differing from low elevations E4 and E5(1400 and 1000 m a.s.l.). Higher elevations with specific soil conditions(e.g bulk density, nitrogen and silt) harbored different cryptogam communities than those in lower elevations.Conclusions: A combination of both elevation and soil properties are shaping the colonization by terricolous cryptogams commnunities. As such, 18 species were identified as the best indicators for all sets of environmental conditions at the roadside, which can therefore be considered for monitoring ecological processes in tropical areas. Use of biocrusts for restoration is an emerging field. If implemented in the study region, elevation and soil drivers may help to better chose the more suitable cryptogam species to manage and stabilize roadside in tropical roads.
文摘Phylogenetic niche conservatism posits that species tend to retain ancestral ecological traits and distributions,which has been broadly tested for lineages originating in tropical climates but has been rarely tested for lineages that originated and diversified in temperate climates.Liverworts are thought to originate in temperate climates.Mean lineage age reflects evolutionary history of biological communities.Here,using regional liverwort floras across a long latitudinal gradient from tropical to arctic climates in North America,we test the age-component of the temperate niche conservatism hypothesis.Mean genus age(MGA)was estimated for each of 76 regional floras of liverworts.We related MGA to climatic variables for North America as a whole and for its eastern and western parts separately,and used variation partitioning analysis to assess the relative importance of temperature-versus precipitationrelated variables and of climate extremes versus seasonality on MGA.We found that older genera of liverworts tend to concentrate in humid regions of intermediate temperatures in the range of 10℃-20℃,from which liverworts have adapted to and diversified into more arid,colder,and hotter regions,supporting the temperate niche conservatism hypothesis.We also found that across North America the MGA of liverwort assemblages is more strongly affected by precipitation-related variables than by temperature-related variables,and is more strongly affected by climate extremes than by climate seasonality.Geographic patterns of the MGA of liverworts are consistent with the temperate niche conservatism hypothesis,rather than the tropical niche conservatism hypothesis,the latter of which is broadly supported by angiosperms.
