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Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC

Hanna Nuuttila Orcid Logo, Winnie Courtene-Jones, Sarah Baulch, Malene Simon, Peter G. H. Evans

Marine Biology, Volume: 164, Issue: 3

Swansea University Author: Hanna Nuuttila Orcid Logo

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Abstract

Populations of bottlenose dolphin and harbour porpoise inhabit Cardigan Bay, which was designated a Special Area of Conservation (SAC), with bottlenose dolphin listed as a primary feature for its conservation status. Understanding the abundance, distribution and habitat use of species is fundamental...

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Published in: Marine Biology
ISSN: 0025-3162 1432-1793
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa32034
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spelling 2017-03-13T12:22:34.2653186 v2 32034 2017-02-21 Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC 0302aad4bf64c26334e2a44a7e8e8f13 0000-0001-8032-1311 Hanna Nuuttila Hanna Nuuttila true false 2017-02-21 SBI Populations of bottlenose dolphin and harbour porpoise inhabit Cardigan Bay, which was designated a Special Area of Conservation (SAC), with bottlenose dolphin listed as a primary feature for its conservation status. Understanding the abundance, distribution and habitat use of species is fundamental for conservation and the implementation of management. Bottlenose dolphin and harbour porpoise usage of feeding sites within Cardigan Bay SAC was examined using passive acoustic monitoring. Acoustic detections recorded with calibrated T-PODs (acoustic data loggers) indicated harbour porpoise to be present year round and in greater relative abundance than bottlenose dolphin. Fine-scale temporal partitioning between the species occurred at three levels: (1) seasonal differences, consistent between years, with porpoise detections peaking in winter months and dolphin detections in summer months; (2) diel variation, consistent across sites, seasons and years, with porpoise detections highest at night and dolphin detections highest shortly after sunrise; and (3) tidal variation was observed with peak dolphin detections occurring during ebb at the middle of the tidal cycle and before low tide, whereas harbour porpoise detections were highest at slack water, during and after high water with a secondary peak recorded during and after low water. General Additive Models (GAMs) were applied to better understand the effects of each covariate. The reported abundance and distribution of the two species, along with the temporal variation observed, have implications for the design and management of protected areas. Currently, in the UK, no SACs have been formally designated for harbour porpoise while three exist for bottlenose dolphins. Here, we demonstrate a need for increased protection and species-specific mitigation measures for harbour porpoise. Journal Article Marine Biology 164 3 0025-3162 1432-1793 Acoustic monitoring, conservation, harbour porpoise, bottlenose dolphin, static acoustic monitoring, C-POD, SAC 31 3 2017 2017-03-31 10.1007/s00227-017-3081-5 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2017-03-13T12:22:34.2653186 2017-02-21T20:13:31.7502788 College of Science Biosciences Hanna Nuuttila 0000-0001-8032-1311 1 Winnie Courtene-Jones 2 Sarah Baulch 3 Malene Simon 4 Peter G. H. Evans 5 0032034-13032017122109.pdf HNuuttila.pdf 2017-03-13T12:21:09.5570000 Output 2388083 application/pdf Version of Record true 2017-02-21T00:00:00.0000000 This article is published with open access at Springerlink.com true eng
title Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
spellingShingle Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
Hanna Nuuttila
title_short Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
title_full Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
title_fullStr Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
title_full_unstemmed Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
title_sort Don’t forget the porpoise: acoustic monitoring reveals fine scale temporal variation between bottlenose dolphin and harbour porpoise in Cardigan Bay SAC
author_id_str_mv 0302aad4bf64c26334e2a44a7e8e8f13
author_id_fullname_str_mv 0302aad4bf64c26334e2a44a7e8e8f13_***_Hanna Nuuttila
author Hanna Nuuttila
author2 Hanna Nuuttila
Winnie Courtene-Jones
Sarah Baulch
Malene Simon
Peter G. H. Evans
format Journal article
container_title Marine Biology
container_volume 164
container_issue 3
publishDate 2017
institution Swansea University
issn 0025-3162
1432-1793
doi_str_mv 10.1007/s00227-017-3081-5
college_str College of Science
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hierarchy_parent_title College of Science
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description Populations of bottlenose dolphin and harbour porpoise inhabit Cardigan Bay, which was designated a Special Area of Conservation (SAC), with bottlenose dolphin listed as a primary feature for its conservation status. Understanding the abundance, distribution and habitat use of species is fundamental for conservation and the implementation of management. Bottlenose dolphin and harbour porpoise usage of feeding sites within Cardigan Bay SAC was examined using passive acoustic monitoring. Acoustic detections recorded with calibrated T-PODs (acoustic data loggers) indicated harbour porpoise to be present year round and in greater relative abundance than bottlenose dolphin. Fine-scale temporal partitioning between the species occurred at three levels: (1) seasonal differences, consistent between years, with porpoise detections peaking in winter months and dolphin detections in summer months; (2) diel variation, consistent across sites, seasons and years, with porpoise detections highest at night and dolphin detections highest shortly after sunrise; and (3) tidal variation was observed with peak dolphin detections occurring during ebb at the middle of the tidal cycle and before low tide, whereas harbour porpoise detections were highest at slack water, during and after high water with a secondary peak recorded during and after low water. General Additive Models (GAMs) were applied to better understand the effects of each covariate. The reported abundance and distribution of the two species, along with the temporal variation observed, have implications for the design and management of protected areas. Currently, in the UK, no SACs have been formally designated for harbour porpoise while three exist for bottlenose dolphins. Here, we demonstrate a need for increased protection and species-specific mitigation measures for harbour porpoise.
published_date 2017-03-31T03:43:58Z
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