FN Archimer Export Format
PT J
TI Ecosystem limits to food web fluxes and fisheries yields in the North Sea simulated with an end-to-end food web model
BT 
AF heath, M
AS 1:1;
FF 1:;
C1 University of Strathclyde, Marine Population Modelling Group, Department of Mathematics and Statistics, Livingstone Tower, Glasgow G1 1XP, UK
C2 UNIV STRATHCLYDE, UK
IF 3.71
TC 27
UR https://archimer.ifremer.fr/doc/00079/19019/16603.pdf
LA English
DT Article
AB Equilibrium yields from an exploited fish stock represent the surplus production remaining after accounting for losses due to predation. However, most estimates of maximum sustainable yield, upon which fisheries management targets are partly based, assume that productivity and predation rates are constant in time or at least stationary. This means that there is no recognition of the potential for interaction between different fishing sectors. Here, an end-to-end ecosystem model is developed to explore the possible scale and mechanisms of interactions between pelagic and demersal fishing in the North Sea. The model simulates fluxes of nitrogen between detritus, inorganic nutrient and guilds of taxa spanning phytoplankton to mammals. The structure strikes a balance between graininess in space, taxonomy and demography, and the need to constrain the parameter-count sufficiently to enable automatic parameter optimization. Simulated annealing is used to locate the maximum likelihood parameter set, given the model structure and a suite of observations of annual rates of production and fluxes between guilds. Simulations of the impact of fishery harvesting rates showed that equilibrium yields of pelagic and demersal fish were strongly interrelated due to a variety of top-down and bottom-up food web interactions. The results clearly show that management goals based on simultaneously achieving maximum sustainable biomass yields from all commercial fish stocks is simply unattainable. Trade-offs between, for example, pelagic and demersal fishery sectors and other properties of the ecosystem have to be considered in devising an overall harvesting strategy.
PY 2012
PD SEP
SO Progress in Oceanography
SN 0079-6611
PU Elsevier
VL 102
UT 000307421600004
BP 42
EP 66
DI 10.1016/j.pocean.2012.03.004
ID 19019
ER

EF