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Comparison of marine spatial planning methods in Madagascar demonstrates value of alternative approaches

Citation

Allnutt, TF and McClanahan, TR and Andrefouet, S and Baker, M and Lagabrielle, E and McClennen, C and Rakotomanjaka, AJM and Tianarisoa, TF and Watson, R and Kremen, C, Comparison of marine spatial planning methods in Madagascar demonstrates value of alternative approaches, PLoS ONE, 7, (2) Article e28969. ISSN 1932-6203 (2012) [Refereed Article]


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Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.1371/journal.pone.0028969

Abstract

The Government of Madagascar plans to increase marine protected area coverage by over one million hectares. To assist this process, we compare four methods for marine spatial planning of Madagascar's west coast. Input data for each method was drawn from the same variables: fishing pressure, exposure to climate change, and biodiversity (habitats, species distributions, biological richness, and biodiversity value). The first method compares visual color classifications of primary variables, the second uses binary combinations of these variables to produce a categorical classification of management actions, the third is a target-based optimization using Marxan, and the fourth is conservation ranking with Zonation. We present results from each method, and compare the latter three approaches for spatial coverage, biodiversity representation, fishing cost and persistence probability. All results included large areas in the north, central, and southern parts of western Madagascar. Achieving 30% representation targets with Marxan required twice the fish catch loss than the categorical method. The categorical classification and Zonation do not consider targets for conservation features. However, when we reduced Marxan targets to 16.3%, matching the representation level of the "strict protection" class of the categorical result, the methods show similar catch losses. The management category portfolio has complete coverage, and presents several management recommendations including strict protection. Zonation produces rapid conservation rankings across large, diverse datasets. Marxan is useful for identifying strict protected areas that meet representation targets, and minimize exposure probabilities for conservation features at low economic cost. We show that methods based on Zonation and a simple combination of variables can produce results comparable to Marxan for species representation and catch losses, demonstrating the value of comparing alternative approaches during initial stages of the planning process. Choosing an appropriate approach ultimately depends on scientific and political factors including representation targets, likelihood of adoption, and persistence goals. © 2012 Allnutt et al.

Item Details

Item Type:Refereed Article
Keywords:animal, article, biodiversity, climate change, comparative study, environmental protection, fish, Madagascar, marine biology, methodology, procedures, coastal waters, conservation biology, controlled study, economic aspect, environmental exposure
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquatic Ecosystem Studies and Stock Assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Fin Fish (excl. Tuna)
Author:Watson, R (Professor Reginald Watson)
ID Code:83625
Year Published:2012
Web of Science® Times Cited:16
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2013-03-20
Last Modified:2014-03-24
Downloads:181 View Download Statistics

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