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  • 1
    Electronic Resource
    Electronic Resource
    Depth and density of burial by the bivalve Paphies ventricosa as refuges from predation by the crab Ovalipes catharus (1987)
    Springer
    Marine biology 94 (1987), S. 25-30 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In experimental conditions, the level of predation by the paddle crabs Ovalipes catharus (White, 1843) on the intertidal bivalve Paphies ventricosa (Gray, 1843) of 30 to 40 mm shell length, was investigated as a function of depth and density of bivalve burial. Bivalves and crabs were collected from the west coast of New Zealand between November 1984 and February 1985. The predation level declined in a linear fashion with increasing depth: the number of P. ventricosa eaten was 70.67–1.33x(depth available for burial in cm), between 0 and 26 cm depth. At three bivalve densities, 500, 1 253, and 2 000 m-2, while the actual numbers eaten from each density were equal, the proportion eaten declined in a non-linear fashion with increasing density. The density of P. ventricosa had, in effect, a negative density-dependent influence on the level of predation by O. catharus. Therefore, both depth and density can act as refuges from predation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392896
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Predatory feeding of the hydromedusae Obelia geniculata and Phialla quadrata (1985)
    Springer
    Marine biology 87 (1985), S. 47-54 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In 1982–1983 nauplii and adults of several co-occurring copepods and Artemia sp. nauplii (Lake Grassmere, New Zealand strain) were fed to the hydromedusae Obelia geniculata (L.) and Phialella quadrata (Forbes), two species which are very abundant in Wellington Harbour, New Zealand. Clearance rates of both hydromedusae were significantly correlated with predator diameter, but independent of water temperature and prey density. P. quadrata consumed all developmental stages of some copepod species, but O. geniculata consumed only nauplii. Clearance rates of O. geniculata were most strongly related with the strength of the prey escape response, and showed little relation with prey size or movement rates. Clearance rates of P. quadrata were equally influenced by the prey escape response and prey size, but a large amount of the variability in clearance rates could not be explained by any of the prey characteristics, or by a linear combination of the prey characteristics. Clearance rates of the hydromedusae are combined with measures of hydromedusa abundance in Wellington Harbour to calculate daily per capita death rates of the prey.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397004
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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