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Using a multi-disciplinary approach to identify a critically endangered killer whale management unit

Esteban, R; Verborgh, P; Gauffier, P; Giménez, J; Martín, V; Pérez-Gil, M; Tejedor, M; ... de Stephanis, R; + view all (2016) Using a multi-disciplinary approach to identify a critically endangered killer whale management unit. Ecological Indicators , 66 pp. 291-300. 10.1016/j.ecolind.2016.01.043. Green open access

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Abstract

A key goal for wildlife managers is identifying discrete, demographically independent conservation units. Previous genetic work assigned killer whales that occur seasonally in the Strait of Gibraltar (SoG) and killer whales sampled off the Canary Islands (CI) to the same population. Here we present new analyses of photo-identification and individual genotypes to assess the level of contemporary gene flow and migration between study areas, and analyses of biomarkers to assess ecological differences. We identified 47 different individuals from 5 pods in the SoG and 16 individuals in the CI, with no matches found between the areas. Mitochondrial DNA control region haplotype was shared by all individuals sampled within each pod, suggesting that pods have a matrifocal social structure typical of this species, whilst the lack of shared mitogenome haplotypes between the CI and SoG individuals suggests that there was little or no female migration between groups. Kinship analysis detected no close kin between CI and SoG individuals, and low to zero contemporary gene flow. Isotopic values and organochlorine pollutant loads also suggest ecological differences between study areas. We further found that one individual from a pod within the SoG not seen in association with the other four pods and identified as belonging to a potential migrant lineage by genetic analyses, had intermediate isotopic values and contaminant between the two study areas. Overall our results suggest a complex pattern of social and genetic structuring correlated with ecological variation. Consequently at least CI and SoG should be considered as two different management units. Understanding this complexity appears to be an important consideration when monitoring and understanding the viability of these management units. Understand the viability will help the conservation of these threatened management units.

Type: Article
Title: Using a multi-disciplinary approach to identify a critically endangered killer whale management unit
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ecolind.2016.01.043
Publisher version: http://dx.doi.org/10.1016/j.ecolind.2016.01.043
Language: English
Additional information: Copyright © 2016 Elsevier Ltd. All rights reserved.
Keywords: Social structure; Genetics; Stable isotopes; Pollutants; Conservation
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
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
URI: http://discovery.ucl.ac.uk/id/eprint/1502338
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