Impact of biased movement on marine protected area effectiveness Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/vm40xt535

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  • Fish mobility affects the distribution of commercially caught fish species in marine protected areas (MPAs) and unprotected areas, which we will call fishing grounds (FGs). Previous theoretical findings predicted that highly mobile fish would benefit little if at all from protection in MPAs (Demartini 1993, Walters et al. 1999). However, Claudet et al. (2010) found that more mobile fish respond at least as well as less mobile fish to MPA protection, hypothesizing that MPAs may increase habitat quality and cause fish to preferentially remain in the MPA. Following Langebrake et al. (2010) we use biased movement ODE models in which fish preferentially remain in MPAs in an attempt to capture the impact of mobility on MPA effectiveness found in Claudet et al. (2010). A general mathematical background is developed and we show that constant recruitment and logistic growth ODE models with biased movement conditionally exhibit increasing steady state relative abundance with increasing mobility.
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