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Satellite tracking of red-listed nominate lesser black-backed gulls (Larus f. fuscus): Habitat specialisation in foraging movements raises novel conservation needs

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Juvaste, Risto and Arriero Higueras, Elena and Gagliardo, Anna and Holland, Richard and Huttunen, Markku J. and Mueller, Inge and Thorup, Kasper and Wikelski, Martin and Hannila, Juhani and Penttinen, Maija-Liisa and Wistbacka, Ralf (2017) Satellite tracking of red-listed nominate lesser black-backed gulls (Larus f. fuscus): Habitat specialisation in foraging movements raises novel conservation needs. Global Ecology and Conservation, 10 . pp. 220-230. ISSN ESSN: 2351-9894

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Official URL: http://www.sciencedirect.com/science/article/pii/S2351989416301603



Abstract

In contrast to many other gull species, nominate lesser black-backed gulls (Larus fuscus fuscus, nLBBG) have shown generally decreasing population trends throughout their breeding area in northern and eastern Fennoscandia over the past decades and are now red-listed. Interspecific competition, predation, increased disturbance, organochlorine poisoning and food shortages were suggested as main reasons for the overall decrease. Here we contribute to a better understanding of population declines by comparing foraging movements of satellite tracked adult gulls in three geographical areas of Finland (West, South, and East) that differ in their population trends. Our analysis examines potential differences and preferences in the feeding site behaviour of adult gulls. Our comparison of the three geographical areas showed that nLBBGs preferred feeding at fur farms in West Finland, waste dumps in South Finland, and lakes and fields in East Finland. We found individual gulls of this purportedly generalist species to be highly specialised in their foraging behaviour, particularly those that might be associated with their survival probabilities. We hypothesise that differences in foraging behaviour and food availability during the breeding season are partially responsible for differences in demographic trends between populations. Specifically, we identify potential local conservation problems such as shooting in birds visiting fur farms. Our data suggest that the effective conservation and management of endangered nLBBGs could be aided by simple actions in the breeding areas in addition to better protection throughout the annual movement cycle.


Item Type:Article
Uncontrolled Keywords:Lesser black-backed gull (Larus fuscus); Satellite tracking; Foraging movement; Interspecific competition; Predation; Shooting birds; Finland
Subjects:Medical sciences > Biology > Birds
ID Code:44119
Deposited On:28 Jul 2017 09:59
Last Modified:10 Dec 2018 15:25

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