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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 92 (1992), S. 563-567 
    ISSN: 1432-1939
    Keywords: Colonization ; Biogeography ; Extinction ; Incidence function ; Metapopulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We found several rare UK butterflies to be restricted to relatively large and non-isolated habitat patches, while small patches and those that are isolated from population sources remain vacant. These patterns of occurrence are generated by the dynamic processes of local extinction and colonization. Habitat patches act as terrestrial archipelagos in which long-term population persistence, and hence effective long-term conservation, rely on networks of suitable habitats, sufficiently close to allow natural dispersal.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: Weddell seal ; vocalization ; Vestfold Hills ; Antarctica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Weddell seal vocalizations from Davis Station showed similarities to those from McMurdo Sound and Palmer Peninsula, but none were identical. One vocalization, DD1, was unique to Davis Station. At all sites trills, or territorial defense calls, were the most common and had more types than other calls. Chugs, an aggressive sound, were common at all sites. Weddell seal calls from Davis Station showed similarities to sounds from McMurdo by sharing the use of prefixes and suffixes. Sounds from Davis Station shared the use of both ascending and descending trills and whistles with calls from Palmer Peninsula. Commonalities in underwater vocalizations may indicate the degree of mixing between breeding populations, in which case, Weddell seals in the Davis area probably are from a breeding population distinct from those at either McMurdo Sound or Palmer Peninsula.
    Type of Medium: Electronic Resource
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