Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 541331
Title Abundance of harbour porpoises (Phocoena phocoena) on the Dutch Continental Shelf, aerial surveys 2012-2017
Author(s) Geelhoed, S.C.V.; Scheidat, M.
Source Lutra 61 (2018). - ISSN 0024-7634 - p. 127 - 136.
Department(s) Onderzoeksformatie
Publication type Refereed Article in a scientific journal
Publication year 2018
About The harbour porpoise (Phocoena phocoena) is the most abundant marine mammal species in Dutch waters. Aerial surveys along predesigned track lines in 2012-2017 provided density and abundance estimates for the Dutch Continental Shelf (DCS) in spring (Mar/Apr 2012, 2013) and summer (Jul 2014, 2015, 2017). The abundance estimates in spring (n=63,408-66,685) were in the same order of magnitude as summer (n=41,299-76,773). Distribution patterns of porpoises differed between seasons and years, but a band of higher densities from the southern part of the DCS to the area north of the western Wadden Isles was visible in all seasons. Calves were only seen in July. The total abundance estimates in spring and summer correspond to a maximum of 17-21% and 7-23% of the southern North Sea population respectively, which implies that a large part of the North Sea population resides in Dutch waters during both seasons.
Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.