Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea
Brasseur, S.M.J.M. (2017). Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea. PhD Thesis. Wageningen University: Wageningen. ISBN 978-94-6343-612-0. 176 pp. https://dx.doi.org/10.18174/418009
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| Beschikbaar in | Auteur |
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Documenttype: Doctoraat/Thesis/Eindwerk
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| Trefwoord |
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| Author keywords |
Seals - Phoca vitulina - Halichoerus grypus - Pinnipedia - Population Biology - Animal Ecology - Wadden Sea - Netherlands |
| Inhoud |
- Brasseur, S.M.J.M.; Reijnders, P.J.H.; Cremer, J.; Meesters, E.; Kirkwood, R.; Jensen, L.F.; Jeß, A.; Galatius, A.; Teilmann, J.; Aarts, G. (2017). Echoes from the past: Regional variations in recovery within a harbour seal population, in: Brasseur, S.M.J.M. Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea. pp. 20-41, meer
- Reijnders, P.J.H.; Brasseur, S.M.J.M.; Meesters, E.H.W.G. (2017). Earlier pupping in harbour seals, Phoca vitulina, in: Brasseur, S.M.J.M. Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea. pp. 44-53, meer
- Brasseur, S.M.J.M.; Reijnders, P.J.H.; Kirkwood, R.; Aarts, G. (2017). Directional breeding migration of harbour seals in the Wadden Sea, in: Brasseur, S.M.J.M. Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea. pp. 54-71, meer
- Brasseur, S.M.J.M.; van Polanen Petel, T.; Gerrodette, T.; Meesters, E.H.W.G.; Reijnders, P.J.H.; Aarts, G. (2017). Rapid recovery of Dutch gray seal colonies fuelled by immigration, in: Brasseur, S.M.J.M. Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea. pp. 76-95, meer
- Brasseur, S.M.J.M.; Aarts, G.; Reijnders, P.J.H.; Kirkwood, R. (2017). Grey seal tracking reveals different behaviours of resident and transient population components, in: Brasseur, S.M.J.M. Seals in motion. How movements drive population development of harbour seals and grey seals in the North Sea. pp. 98-109, meer
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| Abstract |
The harbour seal Phoca vitulina and the grey seal Halichoerus grypus have been inhabitants of the Wadden Sea since millennia. Prehistoric findings indicate the presence of both species around 5000 BC. This changed dramatically in the mid Middle-Ages as around 1500 AC, the grey seal disappeared from the Wadden Sea as a consequence of persecution. With growing hunting pressure, especially in the 20th century and concurrent habitat destruction and pollution, the harbour seals reached all time low numbers in the 1970’s. Banning the hunt in countries around the southern North Sea, limiting pollution and protection from disturbance allowed the harbour seals to slowly recover and the grey seals to return to the Wadden Sea. In this thesis the population trends and inherent dynamics of the recovery for both species is described. Also the movements of individual animals are studied to explain possible mechanisms. |
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