Interactions of productivity, predation risk, and fishing effort in the efficacy of marine protected areas for the central Pacific
- 1 June 2005
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Fisheries and Aquatic Sciences
- Vol. 62 (6), 1320-1336
- https://doi.org/10.1139/f05-114
Abstract
Ecospace biomass-dynamics models for the central North Pacific predict strong space-time variation in abundances of various trophic groups in relation to nutrient-driven patterns in primary production and circulation-driven concentration of production in convergence areas. The model predicts simple patterns in ecosystem organization and abundances along productivity gradients. Predicted patterns are robust to alternative assumptions about how mobile organisms may alter dispersal behavior in relation to local fitness (per capita gain from net food intake minus predation mortality). Large marine protected areas (MPAs) would be needed to rebuild endangered populations and counter impacts of growing fishing effort. We expected that increases in dispersal rate in response to lower food availability and higher predation risk would reduce efficacy of MPAs as a management tool. Instead, simulations indicated that this negative effect may generally be eliminated or even reversed by positive effects of fitness-maximizing behaviors. Interannual variability in ocean circulation can further reduce the efficacy of MPAs; therefore, the dynamic nature of pelagic environments should also be considered in MPA design. Anomalies in ocean circulation may shift productive areas relative to MPA location, resulting in increased fishing mortality and (or) misinterpretation of catch statistics.Keywords
This publication has 26 references indexed in Scilit:
- A MODEL FOR THE BIOECONOMIC EVALUATION OF MARINE PROTECTED AREA SIZE AND PLACEMENT IN THE NORTH SEANatural Resource Modeling, 2002
- Reconstructing ecosystem dynamics in the central Pacific Ocean, 1952–1998. II. A preliminary assessment of the trophic impacts of fishing and effects on tuna dynamicsCanadian Journal of Fisheries and Aquatic Sciences, 2002
- Reconstructing ecosystem dynamics in the central Pacific Ocean, 1952–1998. I. Estimating population biomass and recruitment of tunas and billfishesCanadian Journal of Fisheries and Aquatic Sciences, 2002
- Diagnostic Model and Analysis of the Surface Currents in the Tropical Pacific OceanJournal of Physical Oceanography, 2002
- The Role of Sharks and Longline Fisheries in a Pelagic Ecosystem of the Central PacificEcosystems, 2002
- Marine Reserves: from Beverton and Holt to the PresentReviews in Fish Biology and Fisheries, 1998
- Tuna aggregation and feeding near fronts observed in satellite imageryContinental Shelf Research, 1987
- A General Model for Simulation of Stock and Fleet Dynamics in Spatially Heterogeneous FisheriesCanadian Journal of Fisheries and Aquatic Sciences, 1987
- Optimal Foraging: Attack Strategy of a MantidThe American Naturalist, 1976
- Spatial Model for an Exploited Shellfish Population, and its Application to the Georges Bank Scallop FisheryJournal of the Fisheries Research Board of Canada, 1975