Effects of competitive pressure and habitat heterogeneity on niche partitioning between Arctic and boreal congeners

Bonnet-Lebrun, Anne-Sophie; Larsen, Thomas; Frederiksen, Morten; Fox, Derren; Le Bouard, Fabrice; Boutet, Aude; Þórarinsson, Þorkell Lindberg; Kolbeinsson, Yann; Deville, Tanguy; Ratcliffe, Norman ORCID: 2021 Effects of competitive pressure and habitat heterogeneity on niche partitioning between Arctic and boreal congeners. Scientific Reports, 11, 22133. 8, pp.

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The rapidly changing climate in the Arctic is expected to have a major impact on the foraging ecology of seabirds, owing to changes in the distribution and abundance of their prey but also that of competitors (e.g. southerly species expanding their range into the Arctic). Species can respond to interspecific competition by segregating along different niche axes. Here, we studied spatial, temporal and habitat segregation between two closely related seabird species: common guillemot Uria aalge (a temperate species) and Brünnich’s guillemot Uria lomvia (a true Arctic species), at two sympatric sites in Iceland that differ in their total population sizes and the availability of marine habitats. We deployed GPS and temperature-depth recorders to describe foraging locations and behaviour of incubating and chick-rearing adults. We found similar evidence of spatial segregation at the two sites (i.e. independent of population sizes), although segregation in environmental space was only evident at the site with a strong habitat gradient. Unexpectedly, temporal (and, to a limited extent, vertical) segregation appeared only at the least populated site. Overall, our results show complex relationships between the levels of inferred competition and that of segregation.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 20452322
Additional Keywords: Interspecific competition; habitat segregation; spatial segregation; temporal segregation
Date made live: 12 Nov 2021 09:25 +0 (UTC)

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