Regional-scale patterns in harbour porpoise occupancy of tidal stream environments
Abstract As harbour porpoises Phocoena phocoena are abundant within tidal stream environments, mitigating population-level impacts from tidal stream energy extraction is considered a conservation priority. An understanding of their spatial and temporal occupancy of these habitats at a regional-scale...
Published in: | ICES Journal of Marine Science |
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2017
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsx164 http://academic.oup.com/icesjms/article-pdf/75/2/701/31236178/fsx164.pdf |
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croxfordunivpr:10.1093/icesjms/fsx164 2024-09-15T18:10:42+00:00 Regional-scale patterns in harbour porpoise occupancy of tidal stream environments Waggitt, James J Dunn, Holly K Evans, Peter G H Hiddink, Jan Geert Holmes, Laura J Keen, Emma Murcott, Ben D Piano, Marco Robins, P E Scott, Beth E Whitmore, Jenny Veneruso, Gemma Camphuysen, Kees NERC European Regional Development Fund ERDF Higher Education Funding Council for Wales HEFCW 2017 http://dx.doi.org/10.1093/icesjms/fsx164 http://academic.oup.com/icesjms/article-pdf/75/2/701/31236178/fsx164.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 75, issue 2, page 701-710 ISSN 1054-3139 1095-9289 journal-article 2017 croxfordunivpr https://doi.org/10.1093/icesjms/fsx164 2024-07-01T04:19:45Z Abstract As harbour porpoises Phocoena phocoena are abundant within tidal stream environments, mitigating population-level impacts from tidal stream energy extraction is considered a conservation priority. An understanding of their spatial and temporal occupancy of these habitats at a regional-scale will help steer installations towards locations which maximize energy returns but reduce the potential for interactions with populations. This study quantifies and compares relationships between the presence of harbour porpoise and several hydrodynamic characteristics across four tidal stream environments in Anglesey, UK—a region that has been earmarked for extensive industrial development. Within sites (0.57–1.13 km2), encounters with animals were concentrated in small areas (<200 m2) and increased during certain tidal states (ebb vs. flood). In sites showing relatively high maximum current speeds (2.67–2.87 ms−1), encounters were strongly associated with the emergence of shear-lines. In sites with relatively low maximum current speeds (1.70–2.08 ms−1), encounters were more associated with areas of shallow water during peak current speeds. The overall probability of encounters was higher in low current sites. It is suggested that the likelihood of interactions could be reduced by restricting developments to sites with high maximum current speeds (>2.5 ms−1), and placing turbines in areas of laminar currents therein. This study shows that a combination of local and regional hydrodynamic characteristics can partially explain variations in occupancy patterns across tidal-stream environments. However, it was found that such hydrodynamic characteristics could not comprehensively explain these occupancy patterns. Further studies into the biophysical mechanisms creating foraging opportunities within these habitats are needed to identify alternative explanatory variables that may have universal applications. Article in Journal/Newspaper Harbour porpoise Phocoena phocoena Oxford University Press ICES Journal of Marine Science 75 2 701 710 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract As harbour porpoises Phocoena phocoena are abundant within tidal stream environments, mitigating population-level impacts from tidal stream energy extraction is considered a conservation priority. An understanding of their spatial and temporal occupancy of these habitats at a regional-scale will help steer installations towards locations which maximize energy returns but reduce the potential for interactions with populations. This study quantifies and compares relationships between the presence of harbour porpoise and several hydrodynamic characteristics across four tidal stream environments in Anglesey, UK—a region that has been earmarked for extensive industrial development. Within sites (0.57–1.13 km2), encounters with animals were concentrated in small areas (<200 m2) and increased during certain tidal states (ebb vs. flood). In sites showing relatively high maximum current speeds (2.67–2.87 ms−1), encounters were strongly associated with the emergence of shear-lines. In sites with relatively low maximum current speeds (1.70–2.08 ms−1), encounters were more associated with areas of shallow water during peak current speeds. The overall probability of encounters was higher in low current sites. It is suggested that the likelihood of interactions could be reduced by restricting developments to sites with high maximum current speeds (>2.5 ms−1), and placing turbines in areas of laminar currents therein. This study shows that a combination of local and regional hydrodynamic characteristics can partially explain variations in occupancy patterns across tidal-stream environments. However, it was found that such hydrodynamic characteristics could not comprehensively explain these occupancy patterns. Further studies into the biophysical mechanisms creating foraging opportunities within these habitats are needed to identify alternative explanatory variables that may have universal applications. |
author2 |
Camphuysen, Kees NERC European Regional Development Fund ERDF Higher Education Funding Council for Wales HEFCW |
format |
Article in Journal/Newspaper |
author |
Waggitt, James J Dunn, Holly K Evans, Peter G H Hiddink, Jan Geert Holmes, Laura J Keen, Emma Murcott, Ben D Piano, Marco Robins, P E Scott, Beth E Whitmore, Jenny Veneruso, Gemma |
spellingShingle |
Waggitt, James J Dunn, Holly K Evans, Peter G H Hiddink, Jan Geert Holmes, Laura J Keen, Emma Murcott, Ben D Piano, Marco Robins, P E Scott, Beth E Whitmore, Jenny Veneruso, Gemma Regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
author_facet |
Waggitt, James J Dunn, Holly K Evans, Peter G H Hiddink, Jan Geert Holmes, Laura J Keen, Emma Murcott, Ben D Piano, Marco Robins, P E Scott, Beth E Whitmore, Jenny Veneruso, Gemma |
author_sort |
Waggitt, James J |
title |
Regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
title_short |
Regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
title_full |
Regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
title_fullStr |
Regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
title_full_unstemmed |
Regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
title_sort |
regional-scale patterns in harbour porpoise occupancy of tidal stream environments |
publisher |
Oxford University Press (OUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1093/icesjms/fsx164 http://academic.oup.com/icesjms/article-pdf/75/2/701/31236178/fsx164.pdf |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_source |
ICES Journal of Marine Science volume 75, issue 2, page 701-710 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsx164 |
container_title |
ICES Journal of Marine Science |
container_volume |
75 |
container_issue |
2 |
container_start_page |
701 |
op_container_end_page |
710 |
_version_ |
1810448291564879872 |