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  • Ceriodaphnia  (1)
  • Spatial distribution  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Diets of syntopic finescale dace, Phoxinus neogaeus, and northern redbelly dace, Phoxinus eos: a reflection of trophic morphology (1988)
    Springer
    Environmental biology of fishes 22 (1988), S. 235-240 
    Details
    ISSN: 1573-5133
    Keywords: Cyprinidae ; Feeding ecology ; Habitat ; Minnows ; Resource partitioning ; Spatial distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis We examined relative abundance, distribution, and gut contents of Phoxinus eos and P. neogaeus in a small northern Michigan bog lake. P. eos were usually 5–100 x more abundant than P. neogaeus, but both species were more abundant near the lake margin than offshore. Both species fed primarily on algae and invertebrates associated with the bog mat, but differences in diet were associated with differences in trophic morphology. As expected, because of its relatively longer intestine and smaller mouth, P. eos consumed relatively more plant matter, especially green algae, and fewer macroinvertebrates than P. neogaeus. These dietary conclusions were supported by analysis of two independent data sets. Further work is needed to discriminate between the effects of body size and trophic morphology on diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005384
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  • 2
    Electronic Resource
    Electronic Resource
    Diel variation in horizontal distribution of Daphnia and Ceriodaphnia in oligotrophic and mesotrophic lakes with contrasting fish densities (1999)
    Springer
    Hydrobiologia 408-409 (1999), S. 241-250 
    Details
    ISSN: 1573-5117
    Keywords: shallow lakes ; Daphnia ; Ceriodaphnia ; DHM ; predation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent studies document diel horizontal migration by large zooplankton in eutrophic shallow lakes. Risk of predation from planktivorous fishes could induce such behaviour. We studied diel horizontal distribution of cladocerans in 31 mainly shallow oligotrophic and mesotrophic New Zealand (NZ) and North American (NA) temperate lakes. In terms of weight, fish catch per net (CPUE w ) in multiple mesh-sized gill nets was similar in the two sets of lakes, while CPUE by number (CPUE n ) was overall higher in the NA lakes. Unlike previous results from eutrophic, temperate lakes, we found no significant diel variations in density in the pelagic and littoral zones, suggesting no diel horizontal migration of zooplankton. In the NZ lakes, Daphniaand Ceriodaphniawere evenly distributed between the littoral zone and the pelagial, while in the NA lakes Daphniawere more abundant in the pelagial and Ceriodaphniain the littoral zone. In the oligotrophic fishless NZ lakes, large Daphnia carinatadominated, whereas the smaller Ceriodaphnia dubiadominated in lakes with high CPUE's. In both the NZ and the NA lakes, Daphniashowed no clear correlation to fish CPUE n . However, in the NA lakes, Daphniaoccurred at fish CPUE n values at which they were eliminated in the NZ lakes, which may be related to differences in water transparency, reflecting a higher chlorophyll aand humic content in the NA lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017083924691
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