New ORCA publication on the distribution of toothed cetaceans in offshore waters of the Bay of Biscay

Bottle-nosed Dolphin
Image courtesy Dylan Walker www.breathtakingwhales.com

ORCA is proud to announce the publication of a new scientific publication describing the distribution and habitat preferences of toothed cetaceans in the Bay of Biscay as a result of analysing our extensive database in the region. ORCA would like to thank the tremendous work of our friend and colleague Jeremy Kiszka in putting this work together, alongside colleagues from ORCA and the Centre for Research into Marine Mammals (CRMM) in La Rochelle, France.

Pilot Whales
Image courtesy Dylan Walker www.breathtakingwhales.com

Further details and an abstract are given below:

The online version of the following paper is now available:

DISTRIBUTION, ENCOUNTER RATES AND HABITAT CHARACTERISTICS OF TOOTHED CETACEANS IN THE BAY OF BISCAY AND ADJACENT WATERS FROM PLATFORM-OF-OPPORTUNITY DATA. ICES Journal of Marine Science, 64.

Abstract
Data on the distribution and habitat utilization of oceanic marine mammals are difficult to collect and yet such information is beneficial for many conservation and management purposes. Data collected during ferry-based cetacean surveys in the English Channel and Bay of Biscay between 1998 and 2002 were analysed to investigate the distribution, encounter rate, and habitat characteristics of toothed cetaceans there. In all, 17 873 nautical miles were surveyed, and 1008 encounters of 13 identified species, including delphinids, ziphiids, harbour porpoise, and sperm whale, were recorded. The common dolphin was the commonest species, followed in decreasing occurrence by striped and bottlenose dolphins, pilot whale, harbour porpoise, Cuvier’s beaked whale, and sperm whales. The distribution of harbour porpoises was restricted to the shallow waters of the western English Channel. Common and bottlenose dolphins were distributed mainly over the continental shelf, although there were some encounters along the shelf edge and in the open ocean. Striped dolphins and pilot whales were sighted in oceanic waters in the central and southern Bay of Biscay. Cuvier’s beaked whales and sperm whales were recorded in the deep oceanic waters of the southern Bay of Biscay. Bathymetry clearly plays a significant role in the distribution and habitat partitioning of toothed cetaceans in the region.

Please contact for pdf versions.