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  • age-structured population dynamics  (1)
  • freshwater bivalves  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Valve movement of the freshwater mussel Anodonta anatina: a reciprocal transplant experiment between lake and river (1996)
    Springer
    Hydrobiologia 328 (1996), S. 49-56 
    Details
    ISSN: 1573-5117
    Keywords: biomonitoring ; freshwater bivalves ; Unionidae ; valve movements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of source and caging on the valve movements of the freshwater unionid mussel (Anodonta anatina) were studied in a reciprocal transplant experiment between a lake and its outflow. Caged mussels were moved and compared with those remaining in their natural environment on the lake or river bottom. At both sites, the mussels from the study site and the transplanted mussels from the opposite site were monitored simultaneously. In river the averaged weighted valve openness was higher and the number of valve movements was lower than in the lake. The mussels monitored in the lake exhibited a diurnal rhythm of valve movements which differed between the lake-bottom and the caged animals. Caging was found to increase valve openness. On the other hand, little variation appeared in valve openness between caged and bottom animals in the river, where diurnal rhythms were almost nonexistent. In the river the valve movements were more variable in respect to time than in the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016899
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  • 2
    Electronic Resource
    Electronic Resource
    Should ecological factors affect the evolution of age at maturity in freshwater clams? (1997)
    Springer
    Evolutionary ecology 11 (1997), S. 67-81 
    Details
    ISSN: 1573-8477
    Keywords: age-structured population dynamics ; ESS ; age at maturity ; size-dependent mortality ; freshwater clams ; predation ; castrating parasitism ; stochasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the evolution of age at maturity in freshwater clams of the genus Anodonta in relation to their ecology. We analysed an age-structured density-dependent population dynamics model, which we developed for freshwater clams, using several different options for density dependence. As evolutionary optimality criteria we applied both the maximization of a fitness measure (either intrinsic rate of increase or expected lifetime fecundity) and the concept of evolutionarily stable strategies (ESSs). All three evolutionary criteria yielded estimates which were too high for the optimal age at maturity in a deterministic model with a constant survival rate. The predictions are improved when size-selective predation is included in the model. Mature clams also face a risk of infection by castrating parasites, which would select for delayed maturity. Variable newborn survival selects for earlier reproduction, though the observed levels of stochasticity probably have a negligible effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018435513099
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