Pelagic ciliated protozoa in two monomictic, southern temperate lakes of contrasting trophic state: seasonal distribution and abundance

Pelagic ciliated protozoa in two monomictic, southern temperate lakes of contrasting trophic state: seasonal distribution and abundance

Two lakes of contrasting trophic state in the central North Island of New Zealand were sampled monthly for protozoan ciliates and potential food resources. Oligotrichs dominated numbers in both lakes. Subdominants in oligotrophic Lake Taupo included Askenasia, Pscudobalanion and Urotri-cha, and in e...

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Veröffentlicht in:Journal of plankton research 1995-07, Vol.17 (7), p.1479-1500
Hauptverfasser: James, M.R., Burns, C.W., Forsyth, D.J.
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Sprache:eng
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Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Ciliophora
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Synecology
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creator James, M.R.
Burns, C.W.
Forsyth, D.J.
description Two lakes of contrasting trophic state in the central North Island of New Zealand were sampled monthly for protozoan ciliates and potential food resources. Oligotrichs dominated numbers in both lakes. Subdominants in oligotrophic Lake Taupo included Askenasia, Pscudobalanion and Urotri-cha, and in eutrophic Lake Okaro Prorodon, Coleps, Urocentrum, Stentor and Spirostomum were important. Biomass was dominated by large predatory ciliates and Stentor in Lake Taupo, and Prorodon and Stentor in Lake Okaro. The importance of Prorodon and Stentor to ciliate biomass is unusual and has not been reported for northern hemisphere lakes. Small ciliates (
doi_str_mv 10.1093/plankt/17.7.1479
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Oligotrichs dominated numbers in both lakes. Subdominants in oligotrophic Lake Taupo included Askenasia, Pscudobalanion and Urotri-cha, and in eutrophic Lake Okaro Prorodon, Coleps, Urocentrum, Stentor and Spirostomum were important. Biomass was dominated by large predatory ciliates and Stentor in Lake Taupo, and Prorodon and Stentor in Lake Okaro. The importance of Prorodon and Stentor to ciliate biomass is unusual and has not been reported for northern hemisphere lakes. Small ciliates (&lt;20 μm) capable of consuming particles &lt;2 μm were a major component of the ciliate community in Lake Taupo. Peaks in ciliate abundance occurred at the same time in both lakes: in autumn, at the beginning of mixis and in spring. Ciliates were vertically stratified during mixis and stratification in both lakes. The effect was more pronounced during deoxygenation of the hypolimnion in Lake Okaro which excluded oligotrichs and introduced benthic ciliates. Ciliates were less abundant (mean 40001−1 in Lake Okaro and 9001−1 in Lake Taupo) than in comparable northern temperate lakes. There was no correlation between the seasonal distribution of ciliates and chlorophyll a, primarily caused by a winter peak in chlorophyll a dominated by large species of phytoplankton in Lake Taupo, at a time when ciliate numbers were low. 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Oligotrichs dominated numbers in both lakes. Subdominants in oligotrophic Lake Taupo included Askenasia, Pscudobalanion and Urotri-cha, and in eutrophic Lake Okaro Prorodon, Coleps, Urocentrum, Stentor and Spirostomum were important. Biomass was dominated by large predatory ciliates and Stentor in Lake Taupo, and Prorodon and Stentor in Lake Okaro. The importance of Prorodon and Stentor to ciliate biomass is unusual and has not been reported for northern hemisphere lakes. Small ciliates (&lt;20 μm) capable of consuming particles &lt;2 μm were a major component of the ciliate community in Lake Taupo. Peaks in ciliate abundance occurred at the same time in both lakes: in autumn, at the beginning of mixis and in spring. Ciliates were vertically stratified during mixis and stratification in both lakes. The effect was more pronounced during deoxygenation of the hypolimnion in Lake Okaro which excluded oligotrichs and introduced benthic ciliates. 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Psychology</topic><topic>Synecology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>James, M.R.</creatorcontrib><creatorcontrib>Burns, C.W.</creatorcontrib><creatorcontrib>Forsyth, D.J.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ecology Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) 1: Biological Sciences &amp; Living Resources</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) 3: Aquatic Pollution &amp; Environmental Quality</collection><collection>Aquatic Science &amp; Fisheries Abstracts (ASFA) Professional</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><jtitle>Journal of plankton research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>James, M.R.</au><au>Burns, C.W.</au><au>Forsyth, D.J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pelagic ciliated protozoa in two monomictic, southern temperate lakes of contrasting trophic state: seasonal distribution and abundance</atitle><jtitle>Journal of plankton research</jtitle><date>1995-07</date><risdate>1995</risdate><volume>17</volume><issue>7</issue><spage>1479</spage><epage>1500</epage><pages>1479-1500</pages><issn>0142-7873</issn><eissn>1464-3774</eissn><coden>JPLRD9</coden><abstract>Two lakes of contrasting trophic state in the central North Island of New Zealand were sampled monthly for protozoan ciliates and potential food resources. 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subjects Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Ciliophora
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Synecology
title Pelagic ciliated protozoa in two monomictic, southern temperate lakes of contrasting trophic state: seasonal distribution and abundance
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