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Temporal change in the contribution of immigration to population growth in a wild seabird experiencing rapid population decline

Horswill, Catharine; (2022) Temporal change in the contribution of immigration to population growth in a wild seabird experiencing rapid population decline. Ecography: pattern and diversity in ecology , Article e05846. 10.1111/ecog.05846. Green open access

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Abstract

The source–sink paradigm predicts that populations in poorer-quality habitats (‘sinks') persist due to continued immigration from more-productive areas (‘sources'). However, this categorisation of populations assumes that habitat quality is fixed through time. Globally, we are in an era of wide-spread habitat degradation, and consequently there is a pressing need to examine dispersal dynamics in relation to local population change. We used an integrated population model to quantify immigration dynamics in a long-lived colonial seabird, the black-legged kittiwake Rissa tridactyla, that is classified as globally ‘Vulnerable'. We then used a transient life table response experiment to evaluate the contribution of temporal variation in vital rates, immigration rates and population structure to realised population growth. Finally, we used a simulation analysis to examine the importance of immigration to population dynamics. We show that the contribution of immigration changed as the population declined. This study demonstrates that immigration is unlikely to maintain vulnerable sink populations indefinitely, emphasising the need for temporal analyses of dispersal to identify shifts that may have dramatic consequences for population viability.

Type: Article
Title: Temporal change in the contribution of immigration to population growth in a wild seabird experiencing rapid population decline
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/ecog.05846
Publisher version: https://doi.org/10.1111/ecog.05846
Language: English
Additional information: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/3.0/
Keywords: Demography, dispersal integrated population, model population dynamics, population viability, Rissa tridactyla
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
URI: https://discovery.ucl.ac.uk/id/eprint/10156763
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