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Environmental toxicology: population modeling of cod larvae shows high sensitivity to loss of zooplankton prey |
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| Authors: | Stige Leif Christian Ottersen Geir Hjermann Dag Ø Dalpadado Padmini Jensen Louise K Stenseth Nils Chr |
| Institution: | a Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, P.O. Box 1066 Blindern, N-0316 Oslo, Norway b Institute of Marine Research, Gaustadalléen 21, N-0349 Oslo, Norway c Institute of Marine Research, P.O. Box 1870, N-5817 Bergen, Norway d Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, 9037 Tromsø, Norway e Flødevigen Marine Research Station, Institute of Marine Research, 4817 His, Norway |
| Abstract: | Two factors determine whether pollution is likely to affect a population indirectly through loss of prey: firstly, the sensitivity of the prey to the pollutants, and secondly, the sensitivity of the predator population to loss of prey at the given life stage. We here apply a statistical recruitment model for Northeast Arctic cod to evaluate the sensitivity of cod cohorts to loss of zooplankton prey, for example following an oil spill. The calculations show that cod cohorts are highly sensitive to possible zooplankton biomass reductions in the distribution area of the cod larvae, and point to a need for more knowledge about oil-effects on zooplankton. Our study illustrates how knowledge about population dynamics may guide which indirect effects to consider in environmental impact studies. |
| Keywords: | Oil spill Gadus morhua Zooplankton mortality Population dynamics Ecosystem effect |
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