Structure, abundance, and distribution of pelagic zooplankton in a deep, oligotrophic Caldera Lake Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/73666959g

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  • From July 1985 to April 1987 the pelagiczooplankton community of Crater Lake
  • From July 1985 to April 1987 the pelagiczooplankton community of Crater Lake, Oregon was studiedto determine taxonomic structure, absolute and relativedensities, and spatial and temporal distributionalpatterns. Samples were collected using vertically-towedzooplankton nets. The community structure consisted oftwo cladoceran and nine rotifer species, which were eitherphytophagous, polyphagous, or triptophagous; none waspredaceous. The community numerically was dominated byrotifers, and the majority of the populations occurredwithin the hypolimnion. Taxonomic structure, abundance,and distribution of the zooplankton community wererelatively stable. While the stability was attributed tothe extremely high numerical dominance of the rotifer,Keratella cochlearis, some of the observed variations wereattributed to depth and season. This stability may be short-term. Historic data suggest that the density of thecladoceran, Daphnia pulicaria. is cyclic, being highlyabundant in some years and rare in others. During thisstudy, D. pulicaria abundances were low but appeared to beon an increasing trend. Changes in Daphnia densities maybe due to fluctuations in food supply or in densities ofthe zooplanktivorous kokanee (Oncorhynchus nerkakennerlyi). Such fluctuations in the daphnid populationmay be related to and integrated with changes andfluctuations in the zooplankton and phytoplanktoncommunities, primary production, and water clarity.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-06-10T18:01:10Z (GMT) No. of bitstreams: 1 KarnaughElenaN1988.pdf: 964948 bytes, checksum: a8b921cf685679db2802f6017813af61 (MD5)
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  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-06-12T18:12:49Z (GMT) No. of bitstreams: 1 KarnaughElenaN1988.pdf: 964948 bytes, checksum: a8b921cf685679db2802f6017813af61 (MD5)
  • description.provenance : Made available in DSpace on 2013-06-12T18:12:49Z (GMT). No. of bitstreams: 1 KarnaughElenaN1988.pdf: 964948 bytes, checksum: a8b921cf685679db2802f6017813af61 (MD5) Previous issue date: 1988-03-14

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