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Modelling fine-scale distribution and relative abundance of harbour porpoises in the Southern Bight of the North Sea using platform-of-opportunity data

Published online by Cambridge University Press:  24 April 2020

Thibaut Bouveroux Open the ORCID record for Thibaut Bouveroux [Opens in a new window] ,
James J. Waggitt ,
Anissa Belhadjer ,
Pierre W. Cazenave ,
Peter G.H. Evans  and
Jeremy J. Kiszka
Thibaut Bouveroux*
Affiliation:
Observatoire pour la Conservation et l’Étude des Animaux et Milieux Marins (OCEAMM), Zuydcoote, France Dauphin Island Sea Lab, Dauphin Island, 36528Alabama, USA University of South Alabama, Department of Marine Sciences, Mobile, 36688, Alabama, USA
James J. Waggitt
Affiliation:
School of Ocean Sciences, Bangor University, Wales, UK
Anissa Belhadjer
Affiliation:
Observatoire pour la Conservation et l’Étude des Animaux et Milieux Marins (OCEAMM), Zuydcoote, France
Pierre W. Cazenave
Affiliation:
Plymouth Marine Laboratory, Prospect Place, Plymouth, UK
Peter G.H. Evans
Affiliation:
School of Ocean Sciences, Bangor University, Wales, UK Sea Watch Foundation, Isle of Anglesey, Wales, UK
Jeremy J. Kiszka
Affiliation:
Observatoire pour la Conservation et l’Étude des Animaux et Milieux Marins (OCEAMM), Zuydcoote, France Department of Biological Sciences, Coastlines and Oceans Division, Institute of Environment, Florida International University, North Miami, USA
*
Author for correspondence: Thibaut Bouveroux, E-mail: [email protected]
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Abstract

Over the last 25 years, the harbour porpoise (Phocoena phocoena) has made a significant return to the Southern Bight of the North Sea and the English Channel due to a shift in distribution from northerly regions. Although the ecological drivers of this return are unclear, this species faces multiple threats in the region, including by-catch and habitat degradation. Ferry-based surveys were conducted year-round between November 2011 and June 2014 to assess the influence of environmental parameters upon the spatiotemporal distribution and relative abundance of harbour porpoises in the Southern Bight of the North Sea. A total of 1450 sightings of harbour porpoises were recorded during the 100 round-trip surveys carried out between Dunkirk (France) and Dover (England). Inter-annual and monthly variations in group size were observed, with largest groups recorded in 2014 (mean = 2.02) and in January (mean = 2.32). The relative abundance showed significant seasonal variation, with peaks recorded during winter months. An inter-annual increasing relative abundance was recorded during the study period. There was a seasonally dependent association with environmental variables, particularly depth, seabed roughness and current speed. Finally, predictions suggest large increases of the relative abundance in offshore habitats during winter months and over the study period.

Keywords

AbundancecetaceansEnglish Channelferry-based surveysGeneral Linear Modelsgroup sizehabitat usePhocoena phocoena
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 3 , May 2020 , pp. 481 - 489
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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