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The objective of this study was to characterize the zooplankton and phytoplankton assemblages of four different types of wetlands
and to evaluate their use as environmental indicators. Total abundances, community composition, and species diversity were
evaluated for zooplankton and phytoplankton assemblages from 24 wetlands and related to water quality variables. During August
1995, six representative sites were sampled from four types of wetlands designated as constructed, impacted, non-impacted,
or temporary. The plankton assemblages of all wetlands were dominated by cosmopolitan crustacean, rotifer, and phytoplankton
taxa typical of lake plankton communities. Species diversity, richness, and evenness of zooplankton and phytoplankton assemblages
did not differ significantly among the wetland types. Total zooplankton abundance was significantly (p < 0.01) related to
chlorophyll a and total phosphorus concentrations over the range of trophic conditions. Mean zooplankton densities and phytoplankton
biovolumes were similar among the wetlands, however, the relative abundances of major zooplankton groups differed among the
wetland types. Cyanophytes, primarily Oscillatoria spp., were a major component of the phytoplankton across all four wetland
types, and were significantly more abundant within the constructed and temporary sites. On average, rotifers accounted for
79% of total zooplankton abundance within the constructed wetlands and were much less dominant in the non-impacted and temporary
wetlands. Cladoceran, copepodite, and adult copepod concentrations were low in the constructed and impacted wetlands and increased
in the non-impacted and temporary wetlands in conjunction with increased chlorophytes and cryptophytes. Our preliminary survey
suggests that abiotic factors which are known to directly affect phytoplankton may indirectly affect zooplankton composition
in such a way as to use zooplankton assemblages as indicators of water quality. However, further study incorporating seasonal
dynamics and the influence of predators on zooplankton assemblages is needed to fully assess the use of zooplankton community
composition as an environmental indicator for wetland systems.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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