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Zooplankton dynamics in a highly eutrophic microtidal estuary

Rose, T.H., Tweedley, J.R.ORCID: 0000-0002-2749-1060, Warwick, R.M. and Potter, I.C. (2019) Zooplankton dynamics in a highly eutrophic microtidal estuary. Marine Pollution Bulletin, 142 . pp. 433-451.

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Mesozooplankton was sampled seasonally in a large microtidal estuary (Peel-Harvey) suffering from massive macroalgal growths and cyanobacterial blooms. Comparisons with other estuaries indicate that eutrophication led to copepod abundance declining and macroalgal-associated species increasing. Mesozooplankton species are almost exclusively autochthonous, i.e. spend entire life cycle within the estuary. Meroplanktonic species are virtually absent because main benthic macroinvertebrate species undergo direct benthic rather than planktotrophic development. There are also few abundant holoplanktonic species. Most species are tychoplanktonic, i.e. benthic and transported into plankton through physical disturbance of sediment. Species number, concentration and Simpson's Index are greater during night than day. Annual cyclical changes in species composition are related closely to changes in salinity. At the most degraded site, nematode concentrations were high and the species number and concentration changed markedly during extreme eutrophication, when oxygen concentrations were low, disrupting annual cyclical changes in species composition.

Item Type: Journal Article
Murdoch Affiliation(s): Environmental and Conservation Sciences
Publisher: Elsevier BV
Copyright: © 2019 Elsevier Ltd.
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