[MARMAM] Marine mammal sightings around oil and gas installations in the central North Sea

Karin Tubbert Staal ktc at bios.au.dk
Mon Nov 6 02:32:57 PST 2017

Dear all,

My co-authors and I are pleased to announce the following open-access publication:
Delefosse, M., Rahbek, M., Roesen, L., & Clausen, K. (2017). Marine mammal sightings around oil and gas installations in the central North Sea. Journal of the Marine Biological Association of the United Kingdom, 1-9.


Relatively little is known about the distribution and diversity of marine mammals around offshore anthropogenic structures. We present results obtained from incidental sightings of marine mammals around oil and gas installations located 200 km off the Danish coast. A total of 131 sightings corresponding to about 288 animals were reported between May 2013 and May 2016. A total of seven marine mammal species were identified, five cetaceans: harbour porpoise (Phocoena phocoena), minke whale (Balaenoptera acutorostrata), white-beaked dolphin (Lagenorhynchus albirostris), killer whale (Orcinus orca), pilot whales (Globicephala spp.) and two species of pinnipeds: harbour (Phoca vitulina) and grey seals (Halichoerus grypus). The most sighted species were harbour porpoise (41%) and minke whale (31%). Relative counts and biodiversity of marine mammals observed around installations corresponded well with the expected distribution in the central North Sea. Several taxon-specific correlations were identified between number of sightings and environmental parameters (depth and latitude) or installation characteristics (installation aerial footprint). Furthermore, 85% of sightings were made during spring and summer and it is unclear whether the pattern observed reflected a natural seasonal occurrence of marine mammals in the area or an effect of reduced effort during autumn and winter. Despite the potential caveats, results obtained during this programme provide an insight into the relationship between marine mammals and oil and gas offshore installations in the North Sea.

Enjoy reading it,

All the best,
Karin Tubbert Clausen

Karin Tubbert Clausen
PhD student
Department of Bioscience - Marine Mammal Research, Aarhus University
Frederiksborgvej 399, DK-4000 Roskilde, Denmark
Phone: +45 87158712 Mobile: +45 30260186

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