Distribution and density of harbour popoises in Dutch North Sea waters
Aerial surveys were conducted to investigate harbour porpoise density and distribution in Dutch waters. Surveys were conducted following standard line transect distance sampling methodology on tracklines providing a representative coverage of the study area which ranged from the Dutch coast to about...
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ftunivwagenin:oai:library.wur.nl:wurpubs/385042 2024-02-11T10:04:32+01:00 Distribution and density of harbour popoises in Dutch North Sea waters Scheidat, M. Verdaat, J.P. 2009 application/pdf https://research.wur.nl/en/publications/distribution-and-density-of-harbour-popoises-in-dutch-north-sea-w en eng IMARES https://edepot.wur.nl/143462 https://research.wur.nl/en/publications/distribution-and-density-of-harbour-popoises-in-dutch-north-sea-w Wageningen University & Research delphinidae global positioning systems harbours marine areas marine mammals monitoring north sea phocoena remote sensing globale plaatsbepalingssystemen havens mariene gebieden noordzee zeezoogdieren External research report 2009 ftunivwagenin 2024-01-24T23:19:30Z Aerial surveys were conducted to investigate harbour porpoise density and distribution in Dutch waters. Surveys were conducted following standard line transect distance sampling methodology on tracklines providing a representative coverage of the study area which ranged from the Dutch coast to about 120 km offshore thus covering about half of the Dutch EEZ. Within this overall study area two sub-areas were defined. One sub-area (from Texel to the German border) was covered in on 29 November 2008 and 3 April 2009. Density was 1.02 animals per km² during the November survey and 0.52 animals per km² during the April survey. An overall survey, covering both sub-areas, was conducted on 3 February, 18 March and 3 April 2009. The resulting density was 1.12 animals per km². This corresponds to an estimate of harbour porpoise abundance for this study area of 36 825 animals (95% C.I. 19 090 – 68 130; 0.33 C.V.). Distribution patterns of porpoises in the surveys waters were patchy and seemed variable between surveys. Applying this abundance estimate, a range of potential mortality limits were calculated for the Dutch harbour porpoises. Report Harbour porpoise Wageningen UR (University & Research Centre): Digital Library Dutch Harbour ENVELOPE(-138.621,-138.621,61.183,61.183) |
institution |
Open Polar |
collection |
Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
delphinidae global positioning systems harbours marine areas marine mammals monitoring north sea phocoena remote sensing globale plaatsbepalingssystemen havens mariene gebieden noordzee zeezoogdieren |
spellingShingle |
delphinidae global positioning systems harbours marine areas marine mammals monitoring north sea phocoena remote sensing globale plaatsbepalingssystemen havens mariene gebieden noordzee zeezoogdieren Scheidat, M. Verdaat, J.P. Distribution and density of harbour popoises in Dutch North Sea waters |
topic_facet |
delphinidae global positioning systems harbours marine areas marine mammals monitoring north sea phocoena remote sensing globale plaatsbepalingssystemen havens mariene gebieden noordzee zeezoogdieren |
description |
Aerial surveys were conducted to investigate harbour porpoise density and distribution in Dutch waters. Surveys were conducted following standard line transect distance sampling methodology on tracklines providing a representative coverage of the study area which ranged from the Dutch coast to about 120 km offshore thus covering about half of the Dutch EEZ. Within this overall study area two sub-areas were defined. One sub-area (from Texel to the German border) was covered in on 29 November 2008 and 3 April 2009. Density was 1.02 animals per km² during the November survey and 0.52 animals per km² during the April survey. An overall survey, covering both sub-areas, was conducted on 3 February, 18 March and 3 April 2009. The resulting density was 1.12 animals per km². This corresponds to an estimate of harbour porpoise abundance for this study area of 36 825 animals (95% C.I. 19 090 – 68 130; 0.33 C.V.). Distribution patterns of porpoises in the surveys waters were patchy and seemed variable between surveys. Applying this abundance estimate, a range of potential mortality limits were calculated for the Dutch harbour porpoises. |
format |
Report |
author |
Scheidat, M. Verdaat, J.P. |
author_facet |
Scheidat, M. Verdaat, J.P. |
author_sort |
Scheidat, M. |
title |
Distribution and density of harbour popoises in Dutch North Sea waters |
title_short |
Distribution and density of harbour popoises in Dutch North Sea waters |
title_full |
Distribution and density of harbour popoises in Dutch North Sea waters |
title_fullStr |
Distribution and density of harbour popoises in Dutch North Sea waters |
title_full_unstemmed |
Distribution and density of harbour popoises in Dutch North Sea waters |
title_sort |
distribution and density of harbour popoises in dutch north sea waters |
publisher |
IMARES |
publishDate |
2009 |
url |
https://research.wur.nl/en/publications/distribution-and-density-of-harbour-popoises-in-dutch-north-sea-w |
long_lat |
ENVELOPE(-138.621,-138.621,61.183,61.183) |
geographic |
Dutch Harbour |
geographic_facet |
Dutch Harbour |
genre |
Harbour porpoise |
genre_facet |
Harbour porpoise |
op_relation |
https://edepot.wur.nl/143462 https://research.wur.nl/en/publications/distribution-and-density-of-harbour-popoises-in-dutch-north-sea-w |
op_rights |
Wageningen University & Research |
_version_ |
1790601184513359872 |