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The community structure and distribution patterns of stream macroinvertebrates in the Huai River Basin in China
Damaged river ecosystems are increasing with rapid social and economic development. Community structure and spatial distribution pattern of stream macroinvertebrates reflect the health of river ecosystems, because of their longevity, abundance in taxa and quantity, sensitivity to environment stresses, and amenability to survey. In this study, two field surveys for macroinvertebrate sampling were performed in August 2010 and May 2013. A total of 53 taxonomic groups from 24 families, belonging to 11 orders, 6 classes, and 4 phyla were recorded. The most widespread taxa were Tubificidae (Limnodrilus, Branchiura) and Chironomidae (Chironomus, Einfeldia), which were also the most abundant in the research area, occurring in more than 50% of the sampling sites. The principal coordinate and clustering analyses partitioned the 59 sites into four groups, with similarities in their macroinvertebrate community structures. Moreover, the IndVal analysis identified two indicator taxa in Group 1 (Einfeldia spp and Chironomus plumosus) and Group 4 (Tubificinae spp. and Limnodrilus claparedeianus), and one indicator taxon was present in Group 2 (Branchiura sowerbyi) and Group 3 (Limnodrilus hoffmeisteri), each. Moreover, we discovered that collector–gatherers and predators occurred mainly in Group 3, whereas collector–filterers, scrapers, and shredders were mainly distributed in Group 2, indicating significant differences in the resources and habitats between Group 2 and Group 3.
MF17127 Accepted 09 October 2017
© CSIRO 2017