[MARMAM] new paper on cetacean strandings and bycatch

ruth leeney ruleeney at yahoo.co.uk
Tue Jul 8 22:59:19 PDT 2008

This paper is soon to be published in Biodiversity and Conservation -
Leeney RH, Amies R, Broderick AC, Witt MJ, Loveridge J, Doyle J, Bodley BJ (2008) 
Spatio-temporal analysis of cetacean strandings and bycatch in a UK fisheries hotspot.
Marine vertebrate strandings data can provide insights into the long-term
dynamics of cetacean populations, and the threats they face. We investigate whether the
spatio-temporal patterns of cetacean strandings around Cornwall, SW Britain, have
changed in the past century. Analysis of strandings from 1911 to 2006 (n = 2,257) show
that, since the mid-1970s, the relative frequency of strandings of common dolphins
(Delphinus delphis), harbour porpoises (Phocoena phocoena) and pilot whales (Globicephala melas) has increased significantly. Seasonal peaks in strandings frequencies are apparent, between December and March for harbour porpoises and common dolphins, and between November and January for pilot whales. There were signifcant positive trends in the number of common dolphin and harbour porpoise strandings, as a proportion of total strandings, over time. Strandings of common dolphins, porpoises and all other species occur more frequently on the south coast of Cornwall. A total of 415 cetaceans were subject to full veterinary necropsy to determine cause of death, between 1990 and 2006, and 253 (61%) of these individuals were determined to have died due to bycatch in fishing gear. Analyses of industrialised fishing pressure in UK waters show the seas around Cornwall to be one of the most heavily fished areas of the UK. We suggest a number of factors that could
 be responsible for the recent increases in cetacean strandings in southwest UK waters in recent years, including survey effort, as well as abundance and range shifts that are potentially linked with climate change. Although detectable levels of bycatch rate have not increased over time, fisheries interactions are in significant part responsible for mortality patterns and are worthy of more detailed investigation.
Pdfs are available from Ruth Leeney (rleeney at coastalstudies.org). 

Ruth H. Leeney
Namibian Dolphin Project
Walvis Bay, Namibia

T: (+264)-81-386-3886
E: rleeney at coastalstudies.org 
W: www.namibiandolphinproject.blogspot.com
W: www.westafricacetaceans.blogspot.com
Skype: ruth.leeney

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