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dc.contributor.authorW. Davis, Timothyen_US
dc.contributor.authorJ. Gobler, Christopheren_US
dc.description.abstractThe objective of this study was to assess the ability of laboratory-reared and natural communities of zooplankton to graze on toxic and non-toxic strains of Microcystis during bloom events in the Transquaking River, a tributary of Chesapeake Bay. The dynamics of toxic and non-toxic strains were documented via quantification of the microcystin synthetase gene (mcyD) and ribosomal RNA gene, 16S. During the 2-year field study, Microcystis blooms were comprised of >106 cell equivalents L-1 and the percentage of toxic strains ranged from 1 to 100%. The natural microzooplankton community was able to graze on both strains of Microcystis in two-thirds of experiments, with a slight preference for the non-toxic strains in most experiments. Cultured mesozooplankters (Daphnia pulex and Hyalella azteca) grazed at least one strain (toxic or non-toxic) of Microcystis in only one-third of experiments conducted. In contrast, the wild mesozooplankton community grazed at least one strain of Microcystis in every experiment with electivity indices showing a preference towards toxic strains in most experiments. This finding demonstrates that natural mesozooplankton were better grazers of both toxic and non-toxic strains of Microcystis than their cultured counterparts. Overall, both microzooplankton and mesozooplankton were capable of grazing toxic and non-toxic strains of Microcystis with similar success and at similar rates. As such, the ability to synthesize microcystin does not seem to offer toxic Microcystis populations a significant defense against grazing by co-occurring zooplankton communities.en_US
dc.publisherOxford University Pressen_US
dc.publisher.placeUnited Kingdomen_US
dc.relation.ispartofjournalJournal of Plankton Researchen_US
dc.subject.fieldofresearchFreshwater Ecologyen_US
dc.titleGrazing by mesozooplankton and microzooplankton on toxic and non-toxic strains of Microcystis in the Transquaking River, a tributary of Chesapeake Bayen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.hasfulltextNo Full Text
gro.griffith.authorDavis, Timothy W.

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