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| Correlation analysis of macroinvertebrate community and habitat factors in the middle reaches of Mudan River |
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Abstract In October 2013, a field investigation was done in 3rivers (Mudan River, Hama River and Wolong stream) in the middle reaches of Mudan River Basin. A total of 18benthic macroinvertebrates species were collected from 20samping sites, which belonged to 3phyla, 5classes, 11orders, 16families and were dominated by Insecta, Gastropoda, Oligochaeta. Canonical correspondence analysis (CCA) was further applied to reveal relationship between macroinvertebrate community and the main habitat factors in the sampling sites. Multiple biodiversity indices including Shannon-Wiener index were applied to assess the impact of river orders on the biodiversity. The study demonstrated that flow velocity, dissolved oxygen, gravel substrates were the most important habitat factors influencing the composition and distribution of macroinvertebrates across the sites, and river orders could also affect the macroinvertebrate community. The biodiversity of macroinvertebrates in Mudan River was higher than that in its tributaries, while the average density was lower than its tributaries. The significance of this principle was increased along with the river orders.
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Received: 05 September 2014
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