[MARMAM] Incredible porpoise movements in the Atlantic
jte at bios.au.dk
Fri Jun 15 09:02:36 PDT 2018
We are pleased to announce our new publication in Marine Ecology Progress Series:
Oceanic movements, site fidelity and deep diving in harbour porpoises from Greenland show limited similarities to animals from the North Sea
Nynne H. Nielsen, Jonas Teilmann , Signe Sveegaard , Rikke G. Hansen , Mikkel-Holger S. Sinding , Rune Dietz , Mads Peter Heide-Jørgensen
Marine Ecology Progress Series Volume 597, page 259
ABSTRACT: Harbour porpoises Phocoena phocoena <http://Phocoena%20phocoena%20> are common in continental shelf areas of the North Atlantic, but little information is available on their occurrence outside coastal areas. In this study, 30 harbour porpoises were actively caught in West Greenland and instrumented with satellite transmitters to document their seasonal movements and diving behaviour. The porpoises displayed long-range oceanic movements within the North Atlantic, especially during winter/spring where they moved over areas with water depths >2500 m. While offshore, 2 females demonstrated an average maximum dive depth of 248 m, with the deepest dive reaching 410 m. This behaviour is in contrast to 71 porpoises tagged in Danish waters of the North Sea which did not leave the continental shelf but showed a preference for areas with shallow waters year round, even when at the edge of the continental shelf where greater depths were available. Six tags from Greenland transmitted long enough (up to 3 yr) to demonstrate extensive movements and strong site fidelity to the tagging site in West Greenland the following summer. This study documents that harbour porpoises use oceanic habitats and can dive to depths that enable mesopelagic foraging, while repeatedly demonstrating summer site fidelity to coastal areas.
The paper can be downloaded here: https://int-res.com/abstracts/meps/v597/p259-272/ or I can send you a pdf.
All the best,
Nynne Elmelund Lemming
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