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Experimental measurements of zebra mussel (Dreissena polymorpha) impacts on phytoplankton community composition
Uppsala University.
Uppsala University.
of Ecosystem Studies, Millbrook.
1998 (engelsk)Inngår i: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 39, nr 2, s. 375-386Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

1. To investigate direct effects of zebra mussel (Dreissena polymorpha) feeding activities on phytoplankton community composition, short-term microcosm experiments were performed in natural water with complex phytoplankton communities. Both gross effects (without resuspension of mussel excretions) and net effects (with resuspension) were studied. 2. Gross clearance rates were not selective; essentially all taxa were removed at similar rates ranging from 24 to 63 mt mussel(-1) h(-1). Net clearance rates were highly selective; different plankton taxa were removed at very different rates, ranging from 12 to 83% of the gross rates, leading to consistent changes in the phytoplankton community composition. Thus, although zebra mussels can cause most phytoplankton to decline, there is considerable variation among taxa in either pre-digestive selection or post-digestive survival. 3. The direct, short-term effects of zebra mussels on phytoplankton community composition are consistent with some of the major changes observed in the Hudson River since establishment of zebra mussels. 4. We show, with simple calculations, how zebra mussel filtration rate, its selective efficiency on various taxa, and phytoplankton growth rates interact to produce changes in the phytoplankton composition.

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1998. Vol. 39, nr 2, s. 375-386
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URN: urn:nbn:se:liu:diva-28233DOI: 10.1046/j.1365-2427.1998.00283.xISBN: 0046-5070 (tryckt)OAI: oai:DiVA.org:liu-28233DiVA, id: diva2:248990
Tilgjengelig fra: 2009-10-09 Laget: 2009-10-09 Sist oppdatert: 2017-12-13

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