Macrozoobenthos in Yangtze floodplain lakes patterns of density, biomass, production to connectivity.pdf
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Macrozoobenthos in Yangtze floodplain lakes patterns of density, biomass, production to connectivity
Macrozoobenthos in Yangtze floodplain lakes: patterns of density,
biomass, and production in relation to river connectivity
Bao-Zhu Pan1, Hai-Jun Wang2, Xiao-Min Liang3, AND Hong-Zhu Wang4
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese
Academy of Sciences, Wuhan, Hubei 430072, China
Abstract. A systematic investigation of macrozoobenthos was conducted in Yangtze floodplain waters to
reveal patterns of density, biomass, and production in relation to river connectivity. In the Yangtze-
connected lakes, 78 taxa belonging to 33 families and 62 genera were identified. Macrozoobenthos density
was 327 individuals/m2, biomass was 1.40 g dry mass/m2, and production was 3.23 g dry mass m22 y21.
The assemblages were characterized by high diversity, high production, and high bivalve-filterer
abundance. The key factor determining the macrozoobenthic assemblages was river connectivity. As river
connectivity increased, 3 types of response patterns were observed: 1) density, biomass, and production of
collector-filterers (mainly Bivalvia), shredders (e.g., Stictochironomus), and predators (e.g., Dytiscidae)
showed unimodal changes, i.e., first increased and then decreased; 2) density, biomass, and production of
collector-gatherers (mainly Tubificidae and Chironomidae) decreased continuously; and 3) density of
scrapers (mainly Gastropoda) decreased, whereas their biomass and production changed unimodally. At
an intermediate level of river connectivity, biomass and production of total macrozoobenthos reached
maxima, whereas density decreased with increasing river connectivity. Previous research showed that a
diversity of zoobenthos also peaks at moderate connectivity with rivers. Therefore, to maintain high
productivity as well as high biodiversity in the Yangtze floodplain, protecting the remnants of river-
connected lakes and linking disconnected lakes freely with the mainstream are crucial.
Key words: macrozoobenthos, water current
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