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During the period 2003-2010, cetacean diversity, distribution and relative abundance have been continuously studied in waters of the Autonomous Community of the Basque Country, with the aim of detecting Special Areas for Conservation of cetaceans. Shipboard visual surveys have been carried out, by means of random transect methodology and with optimal effort conditions 13,770 km have been sailed, covering 6,960 km2 area. Higher survey effort was applied in the eastern part of the whole area, in the 40 km adjacent to coast of Gipuzkoa, where 12 cetacean species have been identified. Spatial and temporal distribution studies showed the continued presence of 5 cetacean species; bottlenose dolphin Tursiops truncatus (Montagu, 1821), common dolphin Delphinus delphis (Linnaeus,1758), long-finned pilot whale Globicephala melas (Traill, 1809), striped dolphin Stenella coeruleoalba (Meyen, 1833) and Cuvier’s beaked whale Ziphius cavirostris (Cuvier, 1823). Common dolphin and bottlenose dolphin home range covers the immediate marine environment of Jaizkibel, where minke whales Balaenoptera acutorostrata (Lacépède, 1804), humpback whale Megaptera novaeangliae (Borowski, 1781) and fin whales Balaenoptera physalus (Linnaeus, 1758) appear occasionally but constantly over the time series. The area has been proved to be important for bottlenose dolphins, due to its high population density. A study on a larger spatial scale corroborates the importance of this marine environment for the species, whose population density is the largest in the North Atlantic Marine Demarcation of the North Iberian Peninsula.

munibe monographs. nature series

Estudio de las poblaciones de cetáceos y detección de Zonas Especiales de Conservación para los cetáceos en el entorno marino de Jaizkibel y aguas adyacentes