Aerial surveys of grey seals in the Wadden Sea in the season of 2009-2010: Fewer animals during the moult, more pups

In the Netherlands, dedicated aerial surveys have been carried out since 2002. From 2006 onwards, aerial surveys of grey seals have been synchronized and coordinated trilaterally within the Wadden Sea. However, this only applies to Germany and the Netherlands as no breeding population of grey seals...

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Bibliographic Details
Main Authors: Sophie Brasseur, Peter Reijnders, Thomas Borchardt, Ursula Siebert, Sven Ramdohr, Richard Czeck, Peter Körber, Lasse Fast Jensen, Jonas Teilmann
Format: Report
Language:English
Published: 2019
Subjects:
Biodiversity
Conservation
Monitoring
Scientific research
Helgoland
harbour seal
Online Access:https://zenodo.org/record/8182532
https://doi.org/10.5281/zenodo.8182532
Description
Summary:In the Netherlands, dedicated aerial surveys have been carried out since 2002. From 2006 onwards, aerial surveys of grey seals have been synchronized and coordinated trilaterally within the Wadden Sea. However, this only applies to Germany and the Netherlands as no breeding population of grey seals is present in the Danish part of the Wadden Sea. During summer harbour seal counts, 40 grey seals were observed in Denmark. Like in former years, two surveys are carried out during the moult (March-April). These are supplemented by several aerial or boat counts during the pupping season (November-January). On Helgoland (Germany), surveys are carried out from land.

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