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Diet of harbor porpoises along the Dutch coast: a combined stable isotope and stomach contents approach
Jansen, O.E.; Michel, L.; Lepoint, G.; Das, K.; Couperus, A.S.; Reijnders, P.J.H. (2013). Diet of harbor porpoises along the Dutch coast: a combined stable isotope and stomach contents approach. Mar. Mamm. Sci. 29(3): E295-E311. dx.doi.org/10.1111/j.1748-7692.2012.00621.x
In: Marine Mammal Science. Society for Marine Mammalogy: Lawrence. ISSN 0824-0469; e-ISSN 1748-7692, more
Peer reviewed article  
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Keywords
    Phocoena phocoena (Linnaeus, 1758) [WoRMS]
    Marine/Coastal
Author keywords
    Phocoena phocoena; harbor porpoise; stable isotopes; carbon; nitrogen;SIAR; mixing model
Authors  Top 
  • Jansen, O.E.
  • Michel, L., more
  • Lepoint, G., more
  • Das, K., more
  • Couperus, A.S.
  • Reijnders, P.J.H.
Abstract
    High stranding frequency of porpoises, Phocoena phocoena, along the Dutch coast since 2006 has led to increased interest in the ecology of porpoises in the North Sea. Stranded porpoises were collected along the Dutch coast (2006–2008) and their diet was assessed through stomach content and stable isotope analysis (d13C and d15N) of porpoise muscle and prey. Stable isotope analysis (SIAR) was used to estimate the contribution of prey species to the porpoises' diet. This was compared to prey composition from stomach contents, to analyze differences between long- and short-term diet. According to stomach contents, 90.5% of the diet consisted of gobies, whiting, lesser sandeel, herring, cod, and sprat. Stable isotope analysis revealed that 70-83% of the diet consisted of poor cod, mackerel, greater sandeel, lesser sandeel, sprat, and gobies, highlighting a higher importance of pelagic, schooling species in the porpoises' diet compared to stomach contents. This could be due to prey distribution as well as differences in behavior of porpoises and prey between the coastal zone and offshore waters. This study supports the need for multi-method approaches. Future ecological and fishery impact assessment studies and management decisions for porpoise conservation should acknowledge this difference between the long- and short-term diet.
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