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  • 1
    Electronic Resource
    Electronic Resource
    Anthropogenic influences on the infestation of intertidal gastropods by seabird trematode larvae on the southern Barents Sea coast (1999)
    Springer
    Marine biology 133 (1999), S. 449-453 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this study we examined how the variation in the distribution of six species of seabird trematodes was influenced by human activities along the subarctic Barents Sea coast of northern Norway. This was done by comparing the prevalence of the parasites in two species of intermediate host (Littorinasaxatilis and Littorina obtusata) on seashores near fishing industry complexes, fish farms and at control sites. In L. saxatilis there were higher prevalences at sites influenced by human activities for three out of five trematode species (Microphallus piriformes,  M. similis, Cryptocotyle lingua) which have gulls (Larus spp.) as their predominant final hosts, while in L. obtusata, only  M. similis was more common at sites with human activity. For  M. pygmaeus, a trematode which has the common eider (Somateria mollissima) as its most predominant final host, the prevalence in L.␣saxatilis tended to be higher at sites with fishing industry, but differences were not significant. No such tendency was found in L. obtusata for this trematode. The overall prevalence in L. obtusata was lower than in L.␣saxatilis. This indicates that the vulnerability to trematode infection differs between the two snail species depending on the variation in the distribution patterns in the intertidal zone. Gulls tend to concentrate in areas near fishing industry and fish farms to feed on fish offal, which leads to an increase in the transmission between hosts, and to a higher level of parasite infection, locally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050484
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Feeding Ecology and the Concentration of Organochlorines in Glaucous Gulls (2000)
    Springer
    Ecotoxicology 9 (2000), S. 179-186 
    Details
    ISSN: 1573-3017
    Keywords: Arctic ; organochlorines ; Larido ; gulls ; feeding ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We investigated the blood concentrations of organochlorines (OCs) and the diet of glaucous gulls Larus hyperboreus breeding in two neighbouring areas at Bear Island in the Barents Sea, north-eastern Atlantic. One area was situated on the edge of the large seabird cliff, about 100–150 m above sea level. The second area was about 1–2 km from the seabird cliff, and 10–50 m above sea level. In both 1997 and 1998 there were significant differences between the breeding areas for five OCs (HCB, HCH, Oxychlordan, DDE and PCB) measured, with the birds breeding on the cliff having higher levels. These differences were accompanied by a difference in diet between the areas. Birds in the former area had at least four times higher intake of guillemot Uria spp. eggs, while the birds near sea level seemed to have a much higher intake of fish. This study demonstrates the importance of feeding ecology for the distribution of OCs within populations. The results have important implications for the establishment of monitoring programs for OC contamination of the glaucous gull in the Arctic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008938603257
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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