caa a22 4500 397550979 CHVBK 20180308164750.0 cr unu---uuuuu 161202e199606 xx s 000 0 eng 10.1006/jmsc.1996.0082 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0082 A simple predator-prey model of exploited marine fish populations incorporating alternative prey [Elektronische Daten] [Paul D. Spencer, Jeremy S. Collie] A simple two-species population model in which the predator is partially coupled to the prey is developed. The model is an extension of traditional two-species models but less complex than a three-species system. The growth rate of the predator depends upon predation on the modeled and alternate prey; this formulation provides greater realism in describing marine piscivores, such as spiny dogfish (Squalus acanthias), than two-species predator-prey models. Two stable equilibria separated by a saddle point potentially exist for the predator-prey system, and stochastic variability can lead to movement between equilibrium abundance levels. In addition, endogenous limit cycles may exist in the presence of predator fishing mortality. The model is applied to the predation of spiny dogfish on a representative groundfish species, the Georges Bank haddock (Melanogrammus aeglefinus). Stochastic variability is input to the model in the form of "red noise” (variance is a decreasing function of frequency), a feature observed in marine environments. Predator abundance can increase when the modeled prey abundance is low, due to consumption of alternate prey, consistent with the pattern observed in the spiny dogfish-haddock abundances. Increased harvesting on the predator species allows the prey species to spend a greater proportion of time at the high equilibrium. The model presented here poses the interesting management problem of finding the optimal combination of fishing mortality rates for the two species. © 1996 International council for the Exploration of the Sea Articles nationallicence predator-prey model nationallicence autocorrelated variability nationallicence functional response nationallicence marine fisheries nationallicence exploitation nationallicence management nationallicence Spencer Paul D. University of Rhode Island, Graduate School of Oceanography, Narragansett, Rhode Island, USA, 02882 aut Collie Jeremy S. University of Rhode Island, Graduate School of Oceanography, Narragansett, Rhode Island, USA, 02882 aut ICES Journal of Marine Science Oxford University Press 53/3(1996-06), 615-628 1054-3139 53:3<615 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0082 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0082 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Spencer Paul D. University of Rhode Island, Graduate School of Oceanography, Narragansett, Rhode Island, USA, 02882 aut NATIONALLICENCE 700 1- Collie Jeremy S. University of Rhode Island, Graduate School of Oceanography, Narragansett, Rhode Island, USA, 02882 aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/3(1996-06), 615-628 1054-3139 53:3<615 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford