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  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The susceptiblity of Keratella cochlearis to interference from small cladocerans (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 22 (1989), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. Even at high population densities (300–2000 ind. 1−1), only one of five small cladoceran species (adult body length 〈1 mm) significantly suppressed population growth of the rotifer Keratella cochlearis through interference (encounter) competition. At 500 ind. H, adults of D. ambigua (0.96 mm body length) imposed an instantaneous per capita death rate of 0.21 day−1 on this rotifer. These short-term experiments may have underestimated cladoceran interference because newborn rotifers were rarely present.2. Newborn rotifers (〈12 h old) were much more susceptible than adult rotifers (〉 24 h old) to interference from Ceriodaphnia dubia. All of the small cladoceran species tested were very much less likely than large Daphnia (body lengths 〉1.2 mm) to interfere with K. cochlearis, but perhaps at high population densities they could suppress population growth of susceptible rotifer species by damaging, and possibly eating, relatively small and soft-bodied newborn individuals.3. K. cochlearis of the tecta form, without a posterior spine, produced offspring of the typica form, with a posterior spine, in the presence of C. dubia. This developmental response is stimulated by at least several, and possibly all, cladocerans and probably reduces the susceptibility of the rotifer to cladoceran interference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1989.tb01106.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Competition between rotifers and cladocerans of different body sizes (1989)
    Springer
    Oecologia 81 (1989), S. 295-301 
    Details
    ISSN: 1432-1939
    Keywords: Body size ; Competition ; Rotifera ; Cladocera ; Zooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We conducted laboratory experiments to test the hypothesis that rotifers could coexist with small (〈1.2 mm) but not large (〉1.2 mm) cladocerans. Keratella cochlearis was excluded in 〈8 days by the large cladocerans Daphnia pulex and D. magna, probably through both interference and exploitative competition. On the other hand, K. cochlearis persisted for 8 weeks with two small cladocerans (Bosmina longirostris and Ceriodaphnia dubia) and excluded a third small cladoceran (D. ambigua). Similarly, Synchaeta oblonga coexisted with B. longirostris for 〉7 weeks, and K. testudo coexisted with D. ambigua for 〉4 weeks. Coexistence of small cladocerans and rotifers was always accompanied by suppression of one or both populations, probably primarily if not exclusively by exploitative competition for limiting food resources. These results indicate that the competitive dominance of cladocerans over rotifers decreases markedly with cladoceran body size and that factors other than body size may determine the competitive outcome between rotifers and small cladocerans. Our study provides a mechanistic explanation for a commonly observed pattern in natural zooplankton communities: planktonic rotifers often are abundant when only small cladocerans occur but typically are rare when large cladocerans are present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377074
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Natural changes in the planktonic rotifera of a small acid lake near Sudbury, Ontario following water quality improvements (1986)
    Springer
    Water, air & soil pollution 31 (1986), S. 791-797 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Swan Lake is a small, acidic, metal-contaminated lake located near Sudbury, Ontario. During the past 8 yr, the lake has experienced a substantial increase in pH, together with significant reductions in the concentrations of heavy metals and base cations. These changes were observed only after acid and metal emissions from Sudbury area smelters were reduced. The composition of the planktonic Rotifera in the lake has changed concurrent with improvements in water chemistry. Dominance of the rotifer community by the acidophile Keratella taurocephala has been sharply reduced in recent years, while significant increases in the densities of Polyarthra spp., Chromogaster ovalis, Conochiloides natans and Trichocerca similis have been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284225
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    Paper (German National Licenses)
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