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  • Biological interactions  (1)
  • Laboratory experiments  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 93 (1993), S. 457-462 
    ISSN: 1432-1939
    Keywords: Microcosm ; Meiofauna ; Macoma balthica ; Biological interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To evaluate the effects of a deposit-feeding bivalve on meiobenthic assemblage structure in muddy habitats, a laboratory experiment was performed at the Askö Laboratory in the northwestern Baltic proper. Microcosms, surface area 104 cm2, containing a c. 7-cm thick layer of sieved (0.5 mm) sublittoral mud were established in June 1990. Two months later the tellinid bivalve Macoma balthica was added in quantities varying from 0 to 40 individuals per microcosm. After 5 months the effects of the bivalves on the meiofauna were surprisingly small. The density of harpacticoid copepods was lowest (P 〈0.05) in microcosms containing a high density of M. balthica. It is suggested that competition for food resources was responsible for this pattern. For all other meiofaunal groups, including nematodes which were the most abundant taxon (99%), no significant differences (P〉0.05) were observed among treatments. The assemblage structure of the nematodes was similar between treatments. The vertical distribution of both major taxa and nematode species appeared to be unaffected by the presence of the bivalve.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1939
    Keywords: Baltic Sea ; Indirect interactions ; Laboratory experiments ; Macrofauna ; Switching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Predation by Saduria entomon on the depositfeeding amphipods Monoporeia (=Pontoporeia) affinis and Pontoporeia femorata was studied in laboratory experiments. Prey vulnerabilities were compared in singleprey treatments and in mixed-prey treatments, where the proportions of the two species were varied at one total density. In a pilot experiment, P. femorata was the more vulnerable prey, both in single-prey and mixed-prey treatments. In later experiments, the amphipod species were equally vulnerable in single-prey treatments, while in mixed-prey treatments Saduria preyed preferentially on M. affinis, even when this prey was rare, i.e. it did not “switch”. We suggest that the different result in the later experiments may have been due to a change in the search mode of the isopods.
    Type of Medium: Electronic Resource
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