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Harbour porpoise (Phocoena phocoena) presence, abundance and distribution over the Dogger Bank, North Sea, in winter

Published online by Cambridge University Press:  07 June 2016

A.-C. Cucknell ,
O. Boisseau ,
R. Leaper ,
R. McLanaghan  and
A. Moscrop
A.-C. Cucknell*
Affiliation:
Song of the Whale team, Marine Conservation Research International, 94 High Street, Kelvedon CO5 9AA, UK
O. Boisseau
Affiliation:
Song of the Whale team, Marine Conservation Research International, 94 High Street, Kelvedon CO5 9AA, UK
R. Leaper
Affiliation:
International Fund for Animal Welfare, 87–90 Albert Embankment, London SE1 7UD, UK
R. McLanaghan
Affiliation:
Song of the Whale team, Marine Conservation Research International, 94 High Street, Kelvedon CO5 9AA, UK
A. Moscrop
Affiliation:
Song of the Whale team, Marine Conservation Research International, 94 High Street, Kelvedon CO5 9AA, UK
*
Correspondence should be addressed to: A.-C. Cucknell, Song of the Whale team, Marine Conservation Research International, 94 High Street, Kelvedon CO5 9AA, UK email: [email protected]
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Abstract

An area in the central North Sea was surveyed in November 2011 in order to estimate the abundance and density of harbour porpoises (Phocoena phocoena). A total of 2833 km of pre-determined trackline were acoustically surveyed, of which 28% included visual effort. The poor sighting conditions during the survey limited visual effort and demonstrated the advantage of using acoustic techniques for studying harbour porpoise in winter months. Absolute abundance and density estimates were calculated from acoustic encounter rates using estimates of probability of detection and mean group size. The density of harbour porpoises in the west of the survey area was almost double that in the east, with UK waters to the south-west of the Dogger Bank having the highest density of the area surveyed. The overall acoustic encounter rate was higher than most other surveys in the North Sea. The mean density across the survey area of 0.63 (95% CI 0.27–1.52) individuals km−2 and distribution of porpoises was similar to that documented in the summer suggesting that high abundance of harbour porpoises in the west of the North Sea is not confined to summer months. This information is particularly relevant given plans for the construction of a large offshore wind farm on the UK section of the Dogger Bank; the resulting impacts, including acoustic disturbance from pile driving, will potentially affect substantial numbers of harbour porpoises.

Keywords

acoustic surveyvisual surveydistance samplingpopulation
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 97 , Issue 7 , November 2017 , pp. 1455 - 1465
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

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