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  • Rotifera  (4)
  • Springer  (4)
  • 1995-1999  (4)
  • 1945-1949
  • 1
    Electronic Resource
    Electronic Resource
    Effects of turbidity and biotic factors on the rotifer community in an Ohio reservoir (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 215-223 
    Details
    ISSN: 1573-5117
    Keywords: reservoir ; Rotifera ; spatial distribution ; temporal variation ; turbidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In reservoirs physical horizontal gradients may affect zooplankton distributions as well as the biotic interactions that potentially regulate zooplankton abundance and species composition. We examined patterns of rotifer abundance and population dynamics along a turbidity gradient over a 4-year period in an Ohio reservoir. To analyze the effect of turbidity on rotifer populations we compared rotifer abundance patterns, species composition, birth and death rates at two sites with high turbidity (river site) and low turbidity (dam site) conditions. Because of the potentially important biotic interaction between rotifers and cladocerans, we also compared cladoceran abundance patterns and species composition. Our results suggest no effect of turbidity on rotifers in Acton Lake. Rotifer and cladoceran abundance patterns were similar at low and high turbidity sites. Similarity indices revealed few differences in rotifer and cladoceran species composition between sites. Rotifer birth and death rates were also similar at low and high turbidity sites. In contrast to these homogeneous spatial patterns, among year comparisons indicate high temporal variability in all parameters measured. Mean rotifer densities were similar from 1993 to 1995, but in 1996 density increased 4-fold. Rotifer species assemblages were dominated by Brachionus spp. from 1993 to 1995, while Keratella cochlearis and Polyarthra spp. were numerically dominant in 1996. Mean cladoceran density also increased in 1996 compared to previous years. Cladoceran species composition was dominated by Diaphanosoma birgei from 1993 to 1995, while Daphnia parvula and Bosmina longirostris dominated the 1996 cladoceran community. Comparison of rotifer population parameters in years of contrasting D. parvula abundance suggests that exploitative competition may be an important mechanism regulating rotifer communities in Acton Lake. Interannual variation in Daphnia abundance may in turn be controlled by variation in fish biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017041826108
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Rotifer responses to increased acidity: long-term patterns during the experimental manipulation of Little Rock Lake (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 141-152 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; community ; acidification ; whole-lake experiments ; Little Rock Lake ; Wisconsin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Little Rock Lake, Wisconsin, U.S.A. has been the site of a whole-ecosystem experiment since 1983. It was divided into a treatment basin that was acidified in three, two-year stages and a reference basin. The rotifer community in the treatment basin exhibited a variety of responses to the manipulation. Many species decreased in abundance under reduced pH conditions but other rotifers increased at the same time such that there were ultimately increases with acidification in total rotifer biomass, and quite conspicuously, in the proportion that rotifers comprised of total zooplankton biomass. Ten rotifer species decreased at some stage during the acidification (e.g., Kellicottia longispina, Asplanchna priodonta and Keratella cochlearis) while four species increased dramatically (e.g., Synchaeta sp. and Keratella taurocephala ). Similarity indices and total rotifer biomass differences measured between the two basins exhibited very different temporal patterns of response to acidification. Similarity decreased regularly beginning with the earliest stages of acid additions while biomass was nearly the same between the basins until the late stages of the experiment. Comparisons with other nearby lakes indicate, however, that acid conditions are not the only factors generating among-lake differences in rotifer community characteristics. Changes observed with acidification in Little Rock Lake were such that its total rotifer biomass grew more similar to that in a nearby acidic-bog lake and different from that in a near-neutral-pH lake. At the same time, abundance patterns for individual rotifer species in Little Rock Lake were not particularly similar to those in the other lakes. It appears that, although they are important, acid conditions alone can not account for all observed rotifer community differences among lakes. Higher proportions of rotifer biomass and high populations of K. taurocephala do seem to be common features of many low pH habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017055307027
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effects of turbidity and biotic factors on the rotifer community in an Ohio reservoir (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 215-223 
    Details
    ISSN: 1573-5117
    Keywords: reservoir ; Rotifera ; spatial distribution ; temporal variation ; turbidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In reservoirs physical horizontal gradients may affect zooplankton distributions as well as the biotic interactions that potentially regulate zooplankton abundance and species composition. We examined patterns of rotifer abundance and population dynamics along a turbidity gradient over a 4-year period in an Ohio reservoir. To analyze the effect of turbidity on rotifer populations we compared rotifer abundance patterns, species composition, birth and death rates at two sites with high turbidity (river site) and low turbidity (dam site) conditions. Because of the potentially important biotic interaction between rotifers and cladocerans, we also compared cladoceran abundance patterns and species composition. Our results suggest no effect of turbidity on rotifers in Acton Lake. Rotifer and cladoceran abundance patterns were similar at low and high turbidity sites. Similarity indices revealed few differences in rotifer and cladoceran species composition between sites. Rotifer birth and death rates were also similar at low and high turbidity sites. In contrast to these homogeneous spatial patterns, among year comparisons indicate high temporal variability in all parameters measured. Mean rotifer densities were similar from 1993 to 1995, but in 1996 density increased 4-fold. Rotifer species assemblages were dominated by Brachionus spp. from 1993 to 1995, while Keratella cochlearis and Polyarthra spp. were numerically dominant in 1996. Mean cladoceran density also increased in 1996 compared to previous years. Cladoceran species composition was dominated by Diaphanosoma birgei from 1993 to 1995, while Daphnia parvula and Bosmina longirostris dominated the 1996 cladoceran community. Comparison of rotifer population parameters in years of contrasting D. parvula abundance suggests that exploitative competition may be an important mechanism regulating rotifer communities in Acton Lake. Interannual variation in Daphnia abundance may in turn be controlled by variation in fish biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017041826108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Rotifer responses to increased acidity: long-term patterns during the experimental manipulation of Little Rock Lake (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 141-152 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; community ; acidification ; whole-lake experiments ; Little Rock Lake ; Wisconsin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Little Rock Lake, Wisconsin, U.S.A. has been the site of a whole-ecosystem experiment since 1983. It was divided into a treatment basin that was acidified in three, two-year stages and a reference basin. The rotifer community in the treatment basin exhibited a variety of responses to the manipulation. Many species decreased in abundance under reduced pH conditions but other rotifers increased at the same time such that there were ultimately increases with acidification in total rotifer biomass, and quite conspicuously, in the proportion that rotifers comprised of total zooplankton biomass. Ten rotifer species decreased at some stage during the acidification (e.g., Kellicottia longispina, Asplanchna priodonta and Keratella cochlearis) while four species increased dramatically (e.g., Synchaeta sp. and Keratella taurocephala ). Similarity indices and total rotifer biomass differences measured between the two basins exhibited very different temporal patterns of response to acidification. Similarity decreased regularly beginning with the earliest stages of acid additions while biomass was nearly the same between the basins until the late stages of the experiment. Comparisons with other nearby lakes indicate, however, that acid conditions are not the only factors generating among-lake differences in rotifer community characteristics. Changes observed with acidification in Little Rock Lake were such that its total rotifer biomass grew more similar to that in a nearby acidic-bog lake and different from that in a near-neutral-pH lake. At the same time, abundance patterns for individual rotifer species in Little Rock Lake were not particularly similar to those in the other lakes. It appears that, although they are important, acid conditions alone can not account for all observed rotifer community differences among lakes. Higher proportions of rotifer biomass and high populations of K. taurocephala do seem to be common features of many low pH habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017055307027
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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