Spatio-temporal distribution of chub mackerel Scomber japonicus is strongly susceptible to climate variability.In this study,a weighting-based habitat suitability index(HSI)model was established to assess the impacts ...Spatio-temporal distribution of chub mackerel Scomber japonicus is strongly susceptible to climate variability.In this study,a weighting-based habitat suitability index(HSI)model was established to assess the impacts of Pacific Decadal Oscillation(PDO)on habitat range and distribution of S.japonicus in the East China Sea(ECS)using vertical water temperature at depths of 2.5 m,25 m and 50 m.Results showed that the optimal HSI model selected from ten weighting scenarios can yield reliable predictions.Correlation analysis revealed a significant negative relationship between the PDO index and water temperature anomaly at different depths.The water temperatures at three different layers on the fishing ground of S.japonicus tended to be low in the warm PDO phase and high in the cold PDO phase,respectively.The range of suitable habitats and its spatial distribution exhibited large differences between the warm and cold PDO regimes.During a warm PDO phase,vertical water temperature became cool,and the monthly preferred water temperature at each depth for S.japonicus shifted southeastward.Consequently,habitat quality dramatically decreased,and suitable habitat ranges also reduced and moved southeastward.Conversely,in a cool PDO phase,with the warmer vertical water temperature and northwestward shift of the preferred water temperature,the suitable habitats enlarged and migrated in the same direction.Our findings indicate that the PDO produced significant impacts on habitat range and distribution of S.japonicus in the East China Sea.展开更多
The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sabl...The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sables(Martes zibellina), one of rodents within national first-class protected species, when roads are considered in Huzhong area in Da Hinggan Mountains, northeastern China. Employing published literatures about behavior ecology, aerial photographs and forest stand maps, we classified the study area into three habitat types including best-suitable, suitable and unsuitable habitats based on sable habitat requirements at the landscape scale including four variables derived from forest source map with attribute database. Results indicated the loss and significant fragmentation of best-suitable habitat and home range habitat when roads, especially 150 m avoidance distance of roads, were considered. The roads reduced and fragmented highly suitable habitats more significantly during earlier development period than the later development period. Additionally, the suitable area percentage increased with increasing distance to roads. This study helped to identify the suitable area for sables and location of sable population. Also, this study suggested the passage construction and road management involving road closure and removal will reduce the fragmentation functionally and benefit the sable population.展开更多
In this paper,the quantitative relationship between the wild fruit communities and direct environmental factors is discussed on the basis of detailed data on landscape scale habitats obtained through field vegetation ...In this paper,the quantitative relationship between the wild fruit communities and direct environmental factors is discussed on the basis of detailed data on landscape scale habitats obtained through field vegetation investigation.The results from TWINSPAN and DCCA showed that:1) In the distribution sections of the wild fruit forest in the Keguqin Mountain region,the basic patterns characteristic of the different habitats are due to topographic factors,nutrients and moisture conditions;2) The elevation affected the most basic differentiation of plant communities in the study area,indicating that the elevation condition was the most important factor restricting the distribution of the wild fruit communities in the study area;3) The close relationship between the moisture content in the upper soil layer and the elevation reflected the influence of moisture conditions on both wild fruit and herb-layer communities;4) Nutrient differences not only indicated that the habitat conditions were different in themselves but also showed that the present nutrient conditions of the habitats were seriously affected by human activities.In summary,under complicated mountainous topographic conditions,the habitat conditions for the communities differed very significantly,and the combination of elevation,soil moisture content,total nitrogen,slope aspect,and pH value influenced and controlled the formation of community distribution patterns in the study area.展开更多
A habitat suitability index model(HSI)was established to examine seasonal habitat pattern of Sthenoteuthis oualaniensis in the South China Sea and assessed the impacts of the El Niño event on habitat variations b...A habitat suitability index model(HSI)was established to examine seasonal habitat pattern of Sthenoteuthis oualaniensis in the South China Sea and assessed the impacts of the El Niño event on habitat variations based on sea surface temperature(SST),chlorophyll-a(Chla)and sea surface height(SSH).Environmental conditions and habitat patterns showed significant seasonal and spatial variations.Spatial pattern of favorable environmental conditions played important roles in regulating the ranges and longitudinal and latitudinal distributions of suitable habitats(areas with HSI≥0.6)of S.oualaniensis across seasons.Significant positive correlation was found between SST and HSI,whereas negative relationship was revealed between HSI and Chla as well as SSH by correlation analysis.Comparing to normal climate condition in spring 2014,the El Niño events in spring 2015 and 2016 yielded lower SST and higher Chla and SSH,which were unfavorable for the formation of high-quality habitats.Favorable ranges of environmental conditions showed decreasing trend from spring 2014 to 2016.Consequently,the suitable habitats in spring 2015 and 2016 largely contracted and became discontinuity.Our findings indicated that seasonal habitat patterns of S.oualaniensis in the South China Sea were strongly affected by the El Niño events and local environmental conditions.展开更多
A habitat suitability index model(HSI) was established to examine seasonal habitat pattern of Sthenoteuthis oualaniensis in the South China Sea and assessed the impacts of the El Nino event on habitat variations based...A habitat suitability index model(HSI) was established to examine seasonal habitat pattern of Sthenoteuthis oualaniensis in the South China Sea and assessed the impacts of the El Nino event on habitat variations based on sea surface temperature(SST),chlorophyll-a(Chla) and sea surface height(SSH).Environmental conditions and habitat patterns showed significant seasonal and spatial variations.Spatial pattern of favorable environmental conditions played important roles in regulating the ranges and longitudinal and latitudinal distributions of suitable habitats(areas with HSI≥0.6) of S.oualaniensis across seasons.Significant positive correlation was found between SST and HSI,whereas negative relationship was revealed between HSI and Chla as well as SSH by correlation analysis.Comparing to normal climate condition in spring 2014,the El Nino events in spring 2015 and 2016 yielded lower SST and higher Chla and SSH,which were unfavorable for the formation of high-quality habitats.Favorable ranges of environmental conditions showed decreasing trend from spring 2014 to2016.Consequently,the suitable habitats in spring 2015 and 2016 largely contracted and became discontinuity.Our findings indicated that seasonal habitat patterns of S.oualaniensis in the South China Sea were strongly affected by the El Ni?o events and local environmental conditions.展开更多
基金the National Key R&D Program of China(No.2018YFD0900906)the National Natural Science Foundation of China(No.41906073)+1 种基金the Natural Science Foundation of Shanghai(No.19ZR1423000)the Shanghai Universities First-Class Disciplines Project(Fisheries A).
文摘Spatio-temporal distribution of chub mackerel Scomber japonicus is strongly susceptible to climate variability.In this study,a weighting-based habitat suitability index(HSI)model was established to assess the impacts of Pacific Decadal Oscillation(PDO)on habitat range and distribution of S.japonicus in the East China Sea(ECS)using vertical water temperature at depths of 2.5 m,25 m and 50 m.Results showed that the optimal HSI model selected from ten weighting scenarios can yield reliable predictions.Correlation analysis revealed a significant negative relationship between the PDO index and water temperature anomaly at different depths.The water temperatures at three different layers on the fishing ground of S.japonicus tended to be low in the warm PDO phase and high in the cold PDO phase,respectively.The range of suitable habitats and its spatial distribution exhibited large differences between the warm and cold PDO regimes.During a warm PDO phase,vertical water temperature became cool,and the monthly preferred water temperature at each depth for S.japonicus shifted southeastward.Consequently,habitat quality dramatically decreased,and suitable habitat ranges also reduced and moved southeastward.Conversely,in a cool PDO phase,with the warmer vertical water temperature and northwestward shift of the preferred water temperature,the suitable habitats enlarged and migrated in the same direction.Our findings indicate that the PDO produced significant impacts on habitat range and distribution of S.japonicus in the East China Sea.
基金Under the auspices of National Natural Science Foundation of China(No.41271201,31070422,41201185)
文摘The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sables(Martes zibellina), one of rodents within national first-class protected species, when roads are considered in Huzhong area in Da Hinggan Mountains, northeastern China. Employing published literatures about behavior ecology, aerial photographs and forest stand maps, we classified the study area into three habitat types including best-suitable, suitable and unsuitable habitats based on sable habitat requirements at the landscape scale including four variables derived from forest source map with attribute database. Results indicated the loss and significant fragmentation of best-suitable habitat and home range habitat when roads, especially 150 m avoidance distance of roads, were considered. The roads reduced and fragmented highly suitable habitats more significantly during earlier development period than the later development period. Additionally, the suitable area percentage increased with increasing distance to roads. This study helped to identify the suitable area for sables and location of sable population. Also, this study suggested the passage construction and road management involving road closure and removal will reduce the fragmentation functionally and benefit the sable population.
基金National Technology Support Program (Grant Nos. 2007BAC17B06,2007BAC16B06,2006BAD26B0901)National Natural Science Foundation(Grant Nos. 31060062,110140101)
文摘In this paper,the quantitative relationship between the wild fruit communities and direct environmental factors is discussed on the basis of detailed data on landscape scale habitats obtained through field vegetation investigation.The results from TWINSPAN and DCCA showed that:1) In the distribution sections of the wild fruit forest in the Keguqin Mountain region,the basic patterns characteristic of the different habitats are due to topographic factors,nutrients and moisture conditions;2) The elevation affected the most basic differentiation of plant communities in the study area,indicating that the elevation condition was the most important factor restricting the distribution of the wild fruit communities in the study area;3) The close relationship between the moisture content in the upper soil layer and the elevation reflected the influence of moisture conditions on both wild fruit and herb-layer communities;4) Nutrient differences not only indicated that the habitat conditions were different in themselves but also showed that the present nutrient conditions of the habitats were seriously affected by human activities.In summary,under complicated mountainous topographic conditions,the habitat conditions for the communities differed very significantly,and the combination of elevation,soil moisture content,total nitrogen,slope aspect,and pH value influenced and controlled the formation of community distribution patterns in the study area.
基金This study was financially supported by the Major Projects of Basic and Applied Basic Research Programs in Guangdong Province(2019B030302004)Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(GML2019ZD0605)+1 种基金Key research and development project of Guangdong Province(2020B1111030001)Central Public-Interest Scientific Institution Basal Research Fund(2020TD05 and 2021 SD01).
文摘A habitat suitability index model(HSI)was established to examine seasonal habitat pattern of Sthenoteuthis oualaniensis in the South China Sea and assessed the impacts of the El Niño event on habitat variations based on sea surface temperature(SST),chlorophyll-a(Chla)and sea surface height(SSH).Environmental conditions and habitat patterns showed significant seasonal and spatial variations.Spatial pattern of favorable environmental conditions played important roles in regulating the ranges and longitudinal and latitudinal distributions of suitable habitats(areas with HSI≥0.6)of S.oualaniensis across seasons.Significant positive correlation was found between SST and HSI,whereas negative relationship was revealed between HSI and Chla as well as SSH by correlation analysis.Comparing to normal climate condition in spring 2014,the El Niño events in spring 2015 and 2016 yielded lower SST and higher Chla and SSH,which were unfavorable for the formation of high-quality habitats.Favorable ranges of environmental conditions showed decreasing trend from spring 2014 to 2016.Consequently,the suitable habitats in spring 2015 and 2016 largely contracted and became discontinuity.Our findings indicated that seasonal habitat patterns of S.oualaniensis in the South China Sea were strongly affected by the El Niño events and local environmental conditions.
基金financially supported by the Major Projects of Basic and Applied Basic Research Programs in Guangdong Province(2019B030302004)Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(GML2019ZD0605)+1 种基金Key research and development project of Guangdong Province(2020B1111030001)Central Public-Interest Scientific Institution Basal Research Fund(2020TD05 and 2021 SD01)
文摘A habitat suitability index model(HSI) was established to examine seasonal habitat pattern of Sthenoteuthis oualaniensis in the South China Sea and assessed the impacts of the El Nino event on habitat variations based on sea surface temperature(SST),chlorophyll-a(Chla) and sea surface height(SSH).Environmental conditions and habitat patterns showed significant seasonal and spatial variations.Spatial pattern of favorable environmental conditions played important roles in regulating the ranges and longitudinal and latitudinal distributions of suitable habitats(areas with HSI≥0.6) of S.oualaniensis across seasons.Significant positive correlation was found between SST and HSI,whereas negative relationship was revealed between HSI and Chla as well as SSH by correlation analysis.Comparing to normal climate condition in spring 2014,the El Nino events in spring 2015 and 2016 yielded lower SST and higher Chla and SSH,which were unfavorable for the formation of high-quality habitats.Favorable ranges of environmental conditions showed decreasing trend from spring 2014 to2016.Consequently,the suitable habitats in spring 2015 and 2016 largely contracted and became discontinuity.Our findings indicated that seasonal habitat patterns of S.oualaniensis in the South China Sea were strongly affected by the El Ni?o events and local environmental conditions.
