生态学报2018，Vol.38Issue(7)：2566-2578,13.DOI:10.5846/stxb201704180694
渭河底栖动物性状和功能对空间尺度环境变量响应的生态区差异性
Differences in responses of macroinvertebrate traits and functional diversity to environmental variables at different spatial scales between ecoregions in the Wei River basin, China
摘要
Abstract
Using the macroinvertebrates collected from mountain and lowland ecoregions in the southern basin of Wei River as indicators,we compared the differences in the composition of 29 macroinvertebrate trait categories and seven traits and functional diversity indices between the two ecoregions.The combination of the joint analysis of R (environmental × sites),L (species × sites),and Q (trait × species) (RLQ) and fourth-corner analysis methods was conducted to explore the relationships between macroinvertebrate trait composition and land use and physical and chemical variables.We then used a generalized linear model (GLM) to compare differences in the responses of macroinvertebrate traits and functional diversity to environmental variables at different spatial scales between the two ecoregions.Our results showed that 18of the 29biological traits and 6 of the 7 traits and functional diversity indices significantly differed between the two ecoregions.Macroinvertebrates with biological traits such as none and shelters of leaf parts or wood refuge,lightly sclerotized,well protected exoskeleton or external protection,herbivores,and predators preferred habitats in the mountain ecoregion,while biological traits with integumentary respiration,soft body,and collector-gatherers tended to frequently occur in the lowland ecoregion under higher intensity of human activities.All traits and functional diversity indices,except functional evenness,were significantly higher in the mountain ecoregion than in the lowland ecoregion,which demonstrated that environmental stressors significantly decreased the biological traits and functional diversity in lowland areas.The combination of RLQ and fourth-corner methods revealed that the traits demonstrated a predictable response of trait patterns along the environmental gradient.The GLM model predicted that the functional and trait diversity in mountain and lowland ecoregions could be explained by different environmental variables at different spatial scales,with catchment urban land use,water temperature,and total nitrogen explaining most variations within the biological traits and functional diversity in the mountain ecoregion;but with reach scale agriculture land use and average water depth mainly explaining the decrease of the functional diversity in the lowland ecoregion.关键词
生物性状/功能多样性/RLQ/fourth-corner/GLM/空间尺度/环境变量Key words
biological traits/functional diversity/RLQ analysis/fourth-corner/GLM analysis/spatial scales/environmental variables引用本文复制引用
李胜利,易茂红,陈凯,丁宁,王备新,姚花荣..渭河底栖动物性状和功能对空间尺度环境变量响应的生态区差异性[J].生态学报,2018,38(7):2566-2578,13.基金项目
国家自然科学面上基金项目(41271525) （41271525）
国家自然科学青年基金项目(51509159) （51509159）
