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Marine Protected Areas: reserve effect or natural variability? The Patagonian octopus case

Published online by Cambridge University Press:  11 May 2012

Lorena P. Storero*
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Antonio Oeste, Río Negro, Argentina Instituto de Biología Marina y Pesquera Almirante Storni (IBMPAS-UNCo), San Antonio Oeste, Río Negro, Argentina
Maite A. Narvarte
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Antonio Oeste, Río Negro, Argentina Instituto de Biología Marina y Pesquera Almirante Storni (IBMPAS-UNCo), San Antonio Oeste, Río Negro, Argentina
Raúl A. González
Affiliation:
Instituto de Biología Marina y Pesquera Almirante Storni (IBMPAS-UNCo), San Antonio Oeste, Río Negro, Argentina
*
Correspondence should be addressed to: L.P. Storero, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Antonio Oeste, Río Negro, Argentina email: lorestorero@gmail.com

Abstract

Population characteristics can be influenced by specific factors of the habitat and the natural variability of populations can confuse the effect related to protected environments. This study compares the demographic characteristics of Octopus tehuelchus in three coastal environments: two Marine Protected Areas (San Antonio Bay (SAB) and Islote Lobos (IL)) and a traditional fishing zone (El Fuerte (EF)). Weight–frequency distributions, sex-ratio and recruitment were monthly compared between the three intertidal zones. Octopus tehuelchus was smaller in IL, where fishing intensity is lower or null, and reached the largest sizes in the main fishing area of EF and within SAB (where there is no regulation and a mid–high fishing intensity). The sex proportion in SAB and EF was 1:1 all along the year. Although the proportion of mature females in IL was higher, the highest recruitment was observed in EF (the traditional fishing ground). These new data suggest that previous studies, which reported that Marine Protected Areas have positive effects for O. tehuelchus populations, can no longer be supported, and highlight the importance of understanding and quantifying the magnitude and range of natural variability in each environment when assessing the effectiveness of Marine Protected Areas.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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