Population growth, and hence the population's persistence, is aff... more Population growth, and hence the population's persistence, is affected by several factors such as climate, species interaction, and harvesting pressure. Proper resource management requires an understanding of these factors. We apply techniques based upon age-structured population matrices to analyze estimated stock sizes derived from annual bottom trawl sampling in the winter feeding area of northeast Arctic cod (Gadus morhua L.) from 1981 to 2003. We run generalized additive models to explain population growth rate by different explanatory variables. Cod population growth was found to be positively related to the abundance of capelin (Mallotus villosus Miller), negatively related to the number of cannibalistic cod with a two-year lag, and marginally positively related to the winter North Atlantic Oscillation index (NAO). This model remains true independently from the population status (i.e., fished or non-fished). Capelin abundance is the main variable that to some degree can be adjusted in order to maintain the population size at a given level of cod harvesting. Our results point to the importance of managing conjointly cod and capelin stocks.
... synoptic review of the effect of oil spills on fish populations Dag Ø. Hjermann1, Arne Melsom... more ... synoptic review of the effect of oil spills on fish populations Dag Ø. Hjermann1, Arne Melsom2, Gjert E. Dingsør1, Joël M. Durant1, Anne Maria Eikeset1, Lars Petter Røed2, 3, Geir Ottersen4, 5, Geir Storvik1, 6, Nils Chr. Stenseth1, 7,* ...
Population growth, and hence the population's persistence, is aff... more Population growth, and hence the population's persistence, is affected by several factors such as climate, species interaction, and harvesting pressure. Proper resource management requires an understanding of these factors. We apply techniques based upon age-structured population matrices to analyze estimated stock sizes derived from annual bottom trawl sampling in the winter feeding area of northeast Arctic cod (Gadus morhua L.) from 1981 to 2003. We run generalized additive models to explain population growth rate by different explanatory variables. Cod population growth was found to be positively related to the abundance of capelin (Mallotus villosus Miller), negatively related to the number of cannibalistic cod with a two-year lag, and marginally positively related to the winter North Atlantic Oscillation index (NAO). This model remains true independently from the population status (i.e., fished or non-fished). Capelin abundance is the main variable that to some degree can be adjusted in order to maintain the population size at a given level of cod harvesting. Our results point to the importance of managing conjointly cod and capelin stocks.
... synoptic review of the effect of oil spills on fish populations Dag Ø. Hjermann1, Arne Melsom... more ... synoptic review of the effect of oil spills on fish populations Dag Ø. Hjermann1, Arne Melsom2, Gjert E. Dingsør1, Joël M. Durant1, Anne Maria Eikeset1, Lars Petter Røed2, 3, Geir Ottersen4, 5, Geir Storvik1, 6, Nils Chr. Stenseth1, 7,* ...
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