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dc.contributor.authorFranchini, Filippo Luciano Charly
dc.contributor.authorSmout, Sophie Caroline
dc.contributor.authorBlight, Clint
dc.contributor.authorBoehme, Lars
dc.contributor.authorMunro, Grant
dc.contributor.authorCosta, Marina
dc.contributor.authorHeinrich, Sonja
dc.identifier.citationFranchini , F L C , Smout , S C , Blight , C , Boehme , L , Munro , G , Costa , M & Heinrich , S 2020 , ' Habitat partitioning in sympatric delphinids around the Falkland Islands : predicting distributions based on a limited data set ' , Frontiers in Marine Science , vol. 7 , 277 .
dc.identifier.otherPURE: 267525191
dc.identifier.otherPURE UUID: 35197859-8732-461f-a303-cfa716e078c4
dc.identifier.otherORCID: /0000-0003-4752-0348/work/73700679
dc.identifier.otherORCID: /0000-0002-6069-6682/work/73701878
dc.identifier.otherWOS: 000529897000001
dc.identifier.otherScopus: 85084738686
dc.identifier.otherORCID: /0000-0002-3481-7428/work/91340776
dc.descriptionFunding: The field work was funded by the Darwin Initiative UK Overseas Territories Challenge Fund Project “Inshore Cetaceans of the Falkland Islands” (Project Ref: EIDCF019, administered jointly by Falklands Conservation & Mr Grant Munro), and Darwin Plus: Overseas Territories Environment and Climate Fund Project “Dolphins of the kelp: Data priorities for Falkland’s inshore cetaceans” (Project Ref: DPLUS042, administered by SAERI).en
dc.description.abstractSpatial modelling based on line transect data is a standard method for characterising marine mammal distributions and habitat preference. However, collecting the data required is costly and may be difficult in remote areas. Models based on habitat variables offer the potential to predict where the species will occur in areas outside the area of a localised survey. This has important implications for spatial management where decisions have to be made that affect wide areas over which comprehensive survey efforts may not be feasible. This study demonstrates that it is possible, using a spatially limited data set, to characterise habitat use and predict the distribution of two poorly known sympatric delphinids around the Falkland (Malvinas) Islands (FI), Commerson’s dolphins (Cephalorhynchus commersonii) and Peale’s dolphins (Lagenorhynchus australis). We used a Hurdle model approach to investigate the relationship between dolphin sightings (from a spatially restricted boat-based line transect survey) and environmental covariates. We then used the modelled relationships to predict the distribution and relative abundance of Commerson’s and Peale’s dolphins over the entire FI inshore waters. We compared the predicted distribution maps to independent sightings from a subsequent island-wide aerial line transect survey, and found a close match between predicted and observed distributions. Commerson’s dolphins preferred nearshore waters with strong tidal mixing and were most numerous close to river mouths and in upper inlets or channels. In contrast, Peale’s dolphins preferred deeper, well-stratified areas further from shore as well as nearshore waters with extensive kelp beds. While the two dolphin species are often considered sympatric, our results indicate fine-scale habitat partitioning based on specific habitat preferences, which is important to consider in further studies and marine spatial planning. We provide several methodological refinements to prepare transect sighting data for spatial analysis and implement Hurdle models more easily using the new “dshm” R-package. We also show the usefulness of such refinements applied to a carefully chosen spatially limited dataset as a cost-effective approach to elucidating species distribution patterns. Our methodology and software implementations can be easily applied to transect survey data of other marine and terrestrial taxa.
dc.relation.ispartofFrontiers in Marine Scienceen
dc.rightsCopyright © 2020 Franchini, Smout, Blight, Boehme, Munro, Costa and Heinrich. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.subjectFalkland Islandsen
dc.subjectHabitat partitioningen
dc.subjectHurdle modelen
dc.subjectLine transect surveyen
dc.subjectPredictive species distribution modellingen
dc.subjectCommerson’s dolphinen
dc.subjectPeale’s dolphinen
dc.subjectGC Oceanographyen
dc.subjectQH301 Biologyen
dc.titleHabitat partitioning in sympatric delphinids around the Falkland Islands : predicting distributions based on a limited data seten
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Statisticsen
dc.contributor.institutionUniversity of St Andrews.Coastal Resources Management Groupen
dc.contributor.institutionUniversity of St Andrews.School of Biologyen
dc.contributor.institutionUniversity of St Andrews.Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.Centre for Research into Ecological & Environmental Modellingen
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.description.statusPeer revieweden

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