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Why we should care about movements: Using spatially explicit integrated population models to assess habitat source-sink dynamics

Paquet, Matthieu and Arlt, Debora and Knape, Jonas and Low, Matthew and Forslund, Pär and Pärt, Tomas (2020). Why we should care about movements: Using spatially explicit integrated population models to assess habitat source-sink dynamics. Journal of Animal Ecology. 89 , 2922-2933
[Journal article]

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Abstract

Assessing the source-sink status of populations and habitats is of major importance for understanding population dynamics and for the management of natural populations. Sources produce a net surplus of individuals (per capita contribution to the metapopulation > 1) and will be the main contributors for self-sustaining populations, whereas sinks produce a deficit (contribution < 1). However, making these types of assessments is generally hindered by the problem of separating mortality from permanent emigration, especially when survival probabilities as well as moved distances are habitat-specific. To address this long-standing issue, we propose a spatial multi-event integrated population model (IPM) that incorporates habitat-specific dispersal distances of individuals. Using information about local movements, this IPM adjusts survival estimates for emigration outside the study area. Analysing 24 years of data on a farmland passerine (the northern wheatearOenanthe oenanthe), we assessed habitat-specific contributions, and hence the source-sink status and temporal variation of two key breeding habitats, while accounting for habitat- and sex-specific local dispersal distances of juveniles and adults. We then examined the sensitivity of the source-sink analysis by comparing results with and without accounting for these local movements. Estimates of first-year survival, and consequently habitat-specific contributions, were higher when local movement data were included. The consequences from including movement data were sex specific, with contribution shifting from sink to likely source in one habitat for males, and previously noted habitat differences for females disappearing. Assessing the source-sink status of habitats is extremely challenging. We show that our spatial IPM accounting for local movements can reduce biases in estimates of the contribution by different habitats, and thus reduce the overestimation of the occurrence of sink habitats. This approach allows combining all available data on demographic rates and movements, which will allow better assessment of source-sink dynamics and better informed conservation interventions.

Authors/Creators:Paquet, Matthieu and Arlt, Debora and Knape, Jonas and Low, Matthew and Forslund, Pär and Pärt, Tomas
Title:Why we should care about movements: Using spatially explicit integrated population models to assess habitat source-sink dynamics
Year of publishing :2020
Volume:89
Page range:2922-2933
Number of Pages:12
Publisher:WILEY
ISSN:0021-8790
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:dispersal, habitat quality, integrated population model, land use, Oenanthe oenanthe, population dynamics, sex differences, source-sink
URN:NBN:urn:nbn:se:slu:epsilon-p-108441
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108441
Additional ID:
Type of IDID
DOI10.1111/1365-2656.13357
Web of Science (WoS)000579753000001
ID Code:19793
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology

(NL, NJ) > Swedish Species Information Centre
Deposited By: SLUpub Connector
Deposited On:29 Dec 2020 21:05
Metadata Last Modified:15 Jan 2021 19:44

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