Distribution and density of harbour popoises in Dutch North Sea waters
作者： M. Scheidat , J.P. Verdaat
DOI:
关键词: Porpoise 、 Geography 、 Oceanography 、 Abundance (ecology) 、 Range (biology) 、 Harbour 、 Transect 、 Distance sampling 、 Aerial survey 、 Phocoena
摘要: Aerial surveys were conducted to investigate harbour porpoise density and distribution in Dutch waters. Surveys following standard line transect distance sampling methodology on tracklines providing a representative coverage of the study area which ranged from coast about 120 km offshore thus covering half EEZ. Within this overall two sub-areas defined. One sub-area (from Texel German border) was covered 29 November 2008 3 April 2009. Density 1.02 animals per km² during survey 0.52 survey. An survey, both sub-areas, February, 18 March The resulting 1.12 km². This corresponds an estimate abundance for 36 825 (95% C.I. 19 090 – 68 130; 0.33 C.V.). Distribution patterns porpoises waters patchy seemed variable between surveys. Applying estimate, range potential mortality limits calculated porpoises.
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