NDLI: Disentangling the roles of spatial and environmental variables in shaping benthic algal assemblages in rivers of central and northern China

Content Provider	Springer Nature Link
Author	Tang, Tao Wu, Naicheng Li, Fengqing Fu, Xiaocheng Cai, Qinghua
Copyright Year	2013
Abstract	Benthic algae were collected from central and northern Chinese rivers to test the hypothesis that geographic location has significant contributions in shaping algal assemblages. We used Moran’s eigenvector maps (MEM) to model spatial components and variation partitioning to quantify the influences of spatial and environmental variables on regional patterns of algal richness and community composition, respectively. We found that variation in algal richness was attributed to MEM component 2, 8, and 9 and the quadratic term of N–NO3. Regarding abundance data, latitude, longitude, and MEM component 1, 2, and 7 were important spatial variables. Although P–PO4, pH, and annual mean temperature were significant environmental variables influencing algal community composition, they were all spatially structured. Among the total explained variance in both algal metrics, spatial proportions were higher than that of environmental variables. We also found that abundant species of Achnanthidium minutissimum, Cocconeis placentula, Cymbella delicatula, Cymbella affinis, Cymbella turgidula, and Synedra ulna displayed clear spatially related patterns. In conclusion, the contributions of spatial and environmental variables to regional variation of algal assemblages are scale-dependent. As for our study scale (~1,000 km), spatial control may be more important. Since spatial effects could obscure local environmental impacts on algal communities, appropriate study scale and statistical methods should be taken into account in algal bioassessment. We recommend inclusion of both algal richness and community composition in study of algal biogeography, due to their different relationships with spatial and environmental variables.
Starting Page	453
Ending Page	466
Page Count	14
File Format	PDF
ISSN	13862588
Journal	Aquatic Ecology
Volume Number	47
Issue Number	4
e-ISSN	15735125
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-09-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Benthic algae Biogeography Biodiversity Moran’s eigenvector maps Spatial patterns Variation partitioning Freshwater & Marine Ecology Ecosystems
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics

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