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  • Articles  (2)
  • Coexistence  (1)
  • Life history  (1)
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  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Competition in natural populations of Daphnia (1995)
    Springer
    Oecologia 103 (1995), S. 309-318 
    Details
    ISSN: 1432-1939
    Keywords: Coexistence ; Hybrid ; Competition ; Daphnia ; Hemispecific
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract I investigated the competitive relationships between two species of Daphnia, D. galeata and D. cucullata, and their interspecific hybrid. The term hemispecific competition was introduced to describe competition between parental species and hybrids. In eutrophic Tjeukemeer both parental species were found to compete with the hybrid, whereas competition between D. galeata and D. cucullata seemed limited. Although the effect of competition on life history traits of daphnids may be profound, the influence of the competitors on the seasonal dynamics of the Daphnia species seems limited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328619
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Offspring size in Daphnia: does it pay to be overweight? (1997)
    Springer
    Hydrobiologia 360 (1997), S. 79-88 
    Details
    ISSN: 1573-5117
    Keywords: Life history ; food
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Variation in offspring size and number has beendescribed for a wide range of organisms. In this studyI investigated the relationship between resource levelof the mother and size of her offspring in thecladoceran Daphnia magna, in order to assess whetheroffspring produced at different food levels areoptimal in size for these food levels. Optimaloffspring size was defined as the size of offspringthat yields the highest parental fitness (i.e.offspring of optimal size have the highest juvenilefitness per unit maternal effort invested in them). Iobserved that especially at the higher food levels,daphnids produced offspring that are larger than thecomputed optimal offspring size at these food levels.I interpret this as a mechanism to avoid starvation ofneonates in the case of suddenly deteriorating foodconditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003184214186
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    Paper (German National Licenses)
    Fulltext
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