AB 20:185-194 (2014)  -  DOI: https://doi.org/10.3354/ab00560

Influences of dispersal and local environmental factors on stream macroinvertebrate communities in Qinjiang River, Guangxi, China

Yong Zhang1,2, Jie Zhang1, Lizhu Wang3, Dongqi Lu1, Desuo Cai4, Beixin Wang1,*

1Department of Entomology, Nanjing Agricultural University, Nanjing 210095, China
2Tianjin Nankai High Scool, Tianjin 300100, China
3International Joint Commission, Great Lakes Office, PO Box 32869, Detroit, Michigan 48232, USA
4College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
*Corresponding author:

ABSTRACT: Identifying the underlying mechanisms that explain the spatial variation of stream macroinvertebrate assemblages is crucial for the protection of species diversity. Consequently, questions regarding how much variance in macroinvertebrate community structure is related to spatial dispersal and local environmental factors, and which environmental variables are the key drivers have broad research and management implications. Based on data from 22 stream sites within the Qinjiang River watershed, Guangxi, China, we examined the variation in macroinvertebrate community structure attributable to local environmental factors (i.e. stream physical habitat and water chemistry) vs. spatial dispersal factors (i.e. overland and watercourse spatial eigenvectors among sampling sites) using variation partitioning procedures. Overall, we found that stream macroinvertebrates are influenced both by local environmental factors and spatial dispersal factors. The most important environmental factors structuring macroinvertebrate assemblages were current velocity, dissolved oxygen, conductivity, total phosphorus, and physical habitat quality. Both overland and watercourse dispersal pathways had a similar influence on macroinvertebrate assemblages. These results demonstrate that stream macroinvertebrates within the studied landscape are constrained by local environmental conditions and dispersal factors, and hence comply with the niche-based species sorting hypothesis in the context of metacommunity ecology.

KEY WORDS: Macroinvertebrate · Spatial factors · Local environment · Stream · China

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Cite this article as: Zhang Y, Zhang J, Wang L, Lu D, Cai D, Wang B (2014) Influences of dispersal and local environmental factors on stream macroinvertebrate communities in Qinjiang River, Guangxi, China. Aquat Biol 20:185-194. https://doi.org/10.3354/ab00560

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