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  • 1
    Electronic Resource
    Electronic Resource
    Colonization dynamics and life history traits of seven Daphnia pulex genotypes (1987)
    Springer
    Oecologia 72 (1987), S. 263-271 
    Details
    ISSN: 1432-1939
    Keywords: Colonization ; Daphnia pulex ; Fitness ; Genotypes ; Life history traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A series of experiments revealed significant differences in the potential ability of seven Daphnia pulex genotypes to colonize two lakes in which this species does not naturally reside. Life table experiments, in which individuals from each genotype were raised separately on water and natural phytoplankton from the two lakes, revealed several significant differences among genotypes in life history traits, including age and size at first reproduction, clutch size and offspring body size. Significant differences among genotypes were also found in mean genotype fitness and rate of population increase, although all genotypes were able to increase in absolute numbers. Significant genotypexlake interaction was found for several life history traits and mean fitness, indicating that the relative success of invading genotypes may depend on habitat characteristics. Enclosure experiments, in which all seven genotypes were introduced together into enclosures in both lakes, revealed that some genotypes increased greatly while others declined in relative abundance, and that the most successful genotypes differed between lakes. In addition, the most successful genotypes in the enclosures were not necessarily the genotypes that displayed the highest fitness in the life table experiments, possibly because individuals in the enclosures competed for food resources, leading to exclusion of certain genotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379277
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    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 Limitation Availability
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    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 Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
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    Unknown
    Food web interactions in lakes : proceedings of a workshop held at the University of Notre Dame, March 21 - 26, 1987 (1988)
    Springer
    In:  In: Complex interactions in Lake Communities. Springer, New York, USA, pp. 141-160. ISBN 0-387-96684-6
    Details
    Publication Date: 2012-03-22
    Type: Book chapter , PeerReviewed
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    OceanRep: Book chapter
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