Phylogeography, population structure, abundance and habitat use of bottlenose dolphins, Tursiops truncatus, on the west coast of Ireland

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dc.contributor.advisor Rogan, Emer en
dc.contributor.advisor Ingram, Simon en
dc.contributor.advisor Foote, Andrew en Nykanen, Milaja 2017-03-24T11:52:57Z 2016 2016
dc.identifier.citation Nykanen, M. 2016. Phylogeography, population structure, abundance and habitat use of bottlenose dolphins, Tursiops truncatus, on the west coast of Ireland. PhD Thesis, University College Cork. en
dc.identifier.endpage 255 en
dc.description.abstract Understanding the abundance, ranging patterns and the degree of isolation of populations are key concepts towards successful conservation measures. For my PhD thesis I applied a multi-disciplinary approach that encompassed genetic, mark-recapture and acoustic analyses to identify fine-scale population structure, residency, ranging patterns, habitat use and abundance of bottlenose dolphins, Tursiops truncatus, in Irish waters. Whole mitochondrial genome sequencing together with the latest phylogeographic tools revealed the complex evolutionary and demographic history of bottlenose dolphins in the wider North-east Atlantic highlighting the influence of past climate change following the end of the last glaciation on the current population structure. By analyzing photo-identification and genetic data together, I provided the first evidence for the near complete social isolation of two adjacent coastal populations, likely driven by a combination of socioecological factors. For the first time, the ongoing genetic dispersal between the populations was quantified, and it was established that the populations are effectively genetically isolated and should be managed separately. A precise abundance estimate of 189 (CV = 0.11), derived for one of the coastal populations using a new robust Bayesian modelling framework, together with results from passive acoustic monitoring on site occupancy, can be used to guide monitoring designs in Ireland and possibly elsewhere. The effect of varying levels of sampling effort on the minimum detectable decrease in population size were also examined, and it was found that in order to detect an overall decline of 25% in abundance (guideline in the EU’s Habitats Directive), the coefficient of variation (CV) around the estimate would have to be as low as 0.08 for a six-year reporting period. This would be difficult, if not impossible, to achieve for such a mobile population. An alternative strategy, where the 25% decline could be detected, would be to sample the abundance every two years. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2016, Milaja Nykanen. en
dc.rights.uri en
dc.subject Bottlenose dolphin en
dc.subject Population structure en
dc.subject Phylogenetics en
dc.subject Abundance en
dc.subject Biogeography en
dc.subject Social structure en
dc.subject Passive acoustic monitoring en
dc.subject Habitat use en
dc.subject Monitoring en
dc.subject Conservation en
dc.title Phylogeography, population structure, abundance and habitat use of bottlenose dolphins, Tursiops truncatus, on the west coast of Ireland en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.description.version Accepted Version
dc.contributor.funder National Parks and Wildlife Service, Ireland en
dc.contributor.funder Thomas Crawford Hayes Trust, National University of Ireland Galway en
dc.description.status Not peer reviewed en Biological, Earth & Environmental Sciences en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.chapterOfThesis 2,3
dc.check.embargoformat E-thesis on CORA only en
dc.internal.conferring Spring 2017 en

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© 2016, Milaja Nykanen. Except where otherwise noted, this item's license is described as © 2016, Milaja Nykanen.
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