In the face of multiple,co-varying environmental threats,measuring anthropogenic impacts and species responses to them is essential for developing biomonitoring programs and for biodiversity conservation.One way of in...In the face of multiple,co-varying environmental threats,measuring anthropogenic impacts and species responses to them is essential for developing biomonitoring programs and for biodiversity conservation.One way of investigating species responses to different conditions is through indicator species indexes.In this context,we investigated zooplankton species indicators of system type(stream or pond),and the most responsive zooplankton indicators of land use changes(pasture and forest)and water quality(oxygen,pH,temperature,and conductivity)within each system type.We studied 221 sites(162 streams and 59 ponds)across one region of Acre state and seven regions of Parástate,Brazil.We sampled zooplankton and physical and chemical variables at each site and determined land use through digital image processing.We recorded 190 taxa(112 Rotifera,57 Cladocera,and 21 Copepoda).Thirteen species were pond indicators but none were stream indicators.Several species were indicators of land use and water quality in streams;for example,Disparalona tenuispina indicated highly forested streams and Alonella clathratula and Nicsmirnovius pagii indicated high pasture levels.In ponds,Ephemeroporus barroisi and Lecane doryssa indicated moderate pasture levels and no species indicated forested ponds.Temperature,pH,conductivity,and oxygen were the main drivers of species richness.Our results demonstrate that species-specific responses,rather than assemblage-level patterns,offer insights into the ecological status of these aquatic systems.Furthermore,landscape variables,such as forest and pasture cover,influence the selection of specific zooplankton species in streams but not in ponds.However,forested ponds had the highest species richness.Finally,we highlight the role of certain zooplankton species as sensitive bioindicators of ecosystem health.展开更多
Background The increasing demand for large-scale hydroelectric dam development in tropical developing countries has led to significant land-use changes that impact biodiversity,particularly in megadiverse countries,su...Background The increasing demand for large-scale hydroelectric dam development in tropical developing countries has led to significant land-use changes that impact biodiversity,particularly in megadiverse countries,such as Malaysia.Although many recent infrastructure projects incorporate sustainable concepts for wildlife monitoring and management,studies on the impacts of habitat fragmentation on ground-dwelling birds during the development phase remain scarce.This study aimed to assess the response of forest bird communities,particularly the ground-dwelling birds,across different phases of hydroelectric dam development using infrared camera traps.We collected data from 14 sampling sites in Nenggiri hydroelectric dam catchment area for 25 months across three developmental phases:pre-logging,logging,and construction.Results We recorded 1045 occurrences of 33 bird species,including the critically endangered Malayan Crestless Fireback Lophura erythrophthalma and the endangered Malayan Peacock-Pheasant Polyplectron malacense.There were significant changes between phases,with a notable decrease in the number of pheasants detected,such as the Great Argus Argusianus argus and Malayan Crested Fireback Lophura rufa,especially during the construction phase.Indicator species analysis(Ind Val)identified seven species showing strong associations(p<0.05)with specific development phases,including the Barred Cuckoo-Dove Macropygia unchall and Great Argus for the pre-logging phase.Conclusion These results highlight the vulnerability of ground-dwelling birds,particularly pheasants,to habitat disturbances from large-scale development activities.We propose incorporating camera trap assessments into major infrastructure projects to identify key locations of conservation-priority bird species,and to inform targeted rescue or translocation efforts,particularly during high-impact phases such as habitat clearance and dam impoundment.展开更多
As an important part in forest ecosystems, the arthropod communities in the forest litter are closely related to forest health.Based on the ecological function,community structure and biology of the arthropods,we disc...As an important part in forest ecosystems, the arthropod communities in the forest litter are closely related to forest health.Based on the ecological function,community structure and biology of the arthropods,we discuss the theoretical basis for the selection of particular groups of arthropods as bio-indicators in this paper,and suggest that the evenness and richness of Collembola(Collembolan), Coleoptera(Beetle) and Hymenoptera(Ant) can serve as forest health indicators.In terms of the relationship between forest litter arthropods and forest health,we summarize the main groups of forest litter arthropods suitable as bio-indicators and their ecological functions in forest ecosystems,and subsequently introduce a simple and accurate new method for selecting forest health indicator species by comparing the frequencies of the various species in different habitats.This method was tested with a real case using forest litter arthropods as a bio- indicator to evaluate rain forest health.Finally,the problems in using forest litter arthropods to evaluate and monitor forest habitat health are discussed and the use of multiple bio-indicator species in order to establish a balanced index system is recommended.展开更多
基金supported by Fundação de AmparoàPesquisa do Estado do Pará[FAPESPA-grant number 2022/1437669]the projects“Closing Linnaean and Wallacean Shortfalls in Aquatic Biota in the Amazon”,“Programa de Pesquisa da Biodiversidade da Amazônia Oriental”,and INCT-SinBiAm[Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq-processes 428961/2018-5,441257/2023-2 and 406767/2022-0,respectively]+2 种基金“Patterns of aquatic biodiversity distribution in the state of Pará”[FAPESPA and FAPESP-grant numbers 068/2020 and 2019/25445-1)“Avaliação da biodiversidade aquática de riachos do arquipélago do Marajó”[FAPESPA-grant number ICCAF:049/2021]TSM and LJ received productivity scholarships by Conselho Nacional de Desenvolvimento Científico e Tecnológico(processes:311835/2023-6,304710/2019-9,respectively).
文摘In the face of multiple,co-varying environmental threats,measuring anthropogenic impacts and species responses to them is essential for developing biomonitoring programs and for biodiversity conservation.One way of investigating species responses to different conditions is through indicator species indexes.In this context,we investigated zooplankton species indicators of system type(stream or pond),and the most responsive zooplankton indicators of land use changes(pasture and forest)and water quality(oxygen,pH,temperature,and conductivity)within each system type.We studied 221 sites(162 streams and 59 ponds)across one region of Acre state and seven regions of Parástate,Brazil.We sampled zooplankton and physical and chemical variables at each site and determined land use through digital image processing.We recorded 190 taxa(112 Rotifera,57 Cladocera,and 21 Copepoda).Thirteen species were pond indicators but none were stream indicators.Several species were indicators of land use and water quality in streams;for example,Disparalona tenuispina indicated highly forested streams and Alonella clathratula and Nicsmirnovius pagii indicated high pasture levels.In ponds,Ephemeroporus barroisi and Lecane doryssa indicated moderate pasture levels and no species indicated forested ponds.Temperature,pH,conductivity,and oxygen were the main drivers of species richness.Our results demonstrate that species-specific responses,rather than assemblage-level patterns,offer insights into the ecological status of these aquatic systems.Furthermore,landscape variables,such as forest and pasture cover,influence the selection of specific zooplankton species in streams but not in ponds.However,forested ponds had the highest species richness.Finally,we highlight the role of certain zooplankton species as sensitive bioindicators of ecosystem health.
基金funded by Tenaga Nasional Berhad Research(TNBR)grant number ST-2022–019
文摘Background The increasing demand for large-scale hydroelectric dam development in tropical developing countries has led to significant land-use changes that impact biodiversity,particularly in megadiverse countries,such as Malaysia.Although many recent infrastructure projects incorporate sustainable concepts for wildlife monitoring and management,studies on the impacts of habitat fragmentation on ground-dwelling birds during the development phase remain scarce.This study aimed to assess the response of forest bird communities,particularly the ground-dwelling birds,across different phases of hydroelectric dam development using infrared camera traps.We collected data from 14 sampling sites in Nenggiri hydroelectric dam catchment area for 25 months across three developmental phases:pre-logging,logging,and construction.Results We recorded 1045 occurrences of 33 bird species,including the critically endangered Malayan Crestless Fireback Lophura erythrophthalma and the endangered Malayan Peacock-Pheasant Polyplectron malacense.There were significant changes between phases,with a notable decrease in the number of pheasants detected,such as the Great Argus Argusianus argus and Malayan Crested Fireback Lophura rufa,especially during the construction phase.Indicator species analysis(Ind Val)identified seven species showing strong associations(p<0.05)with specific development phases,including the Barred Cuckoo-Dove Macropygia unchall and Great Argus for the pre-logging phase.Conclusion These results highlight the vulnerability of ground-dwelling birds,particularly pheasants,to habitat disturbances from large-scale development activities.We propose incorporating camera trap assessments into major infrastructure projects to identify key locations of conservation-priority bird species,and to inform targeted rescue or translocation efforts,particularly during high-impact phases such as habitat clearance and dam impoundment.
文摘As an important part in forest ecosystems, the arthropod communities in the forest litter are closely related to forest health.Based on the ecological function,community structure and biology of the arthropods,we discuss the theoretical basis for the selection of particular groups of arthropods as bio-indicators in this paper,and suggest that the evenness and richness of Collembola(Collembolan), Coleoptera(Beetle) and Hymenoptera(Ant) can serve as forest health indicators.In terms of the relationship between forest litter arthropods and forest health,we summarize the main groups of forest litter arthropods suitable as bio-indicators and their ecological functions in forest ecosystems,and subsequently introduce a simple and accurate new method for selecting forest health indicator species by comparing the frequencies of the various species in different habitats.This method was tested with a real case using forest litter arthropods as a bio- indicator to evaluate rain forest health.Finally,the problems in using forest litter arthropods to evaluate and monitor forest habitat health are discussed and the use of multiple bio-indicator species in order to establish a balanced index system is recommended.
