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Egg production patterns of two invertebrate species in rocky subtidal areas under different fishing regimes along the coast of central Chile

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  • Marta Blanco
  • Andres Ospina-Álvarez
  • Catherine González
  • Miriam Fernández

Abstract

Fishing is a major source of human impact, reducing density and size of a wide range of exploited species in comparison to areas exhibiting strong regulations (no-take and partially protected areas, including Territorial Use Rights for Fisheries, TURFs). Since size and density might have important consequences on reproduction, and therefore natural re-seeding, we monitored adult size, density and potential fecundity of the keyhole limpet (Fissurella latimarginata) and the red sea urchin (Loxechinus albus) in areas under two fishing regimes (TURFs and Open Access Areas, OAAs). Analyzing the distribution of suitable habitats, we predict spatial patterns of potential egg production, to identify reproductive hotspots along the central coast of Chile. The current system of TURFs in central Chile showed higher potential egg production of F. latimarginata and of L. albus than expected under a complete OAAs scenario (67 and 52% respectively). Potential egg production showed more than a twofold reduction when the complete TURFs scenario was compared against complete OAAs condition in both species. Individual size and density explained between 60% and 100% of the variability in potential egg production, suggesting the importance of the enhancement of both biological variables in TURFs in Chile. Potential egg production for both species in the northern part of the studied domain was higher due to the combined effect of (a) suitable habitat and (b) concentration of TURFs. Our results suggest that partially protected areas, such as TURFs can significantly enhance the production of propagules that could seed exploited areas.

Suggested Citation

  • Marta Blanco & Andres Ospina-Álvarez & Catherine González & Miriam Fernández, 2017. "Egg production patterns of two invertebrate species in rocky subtidal areas under different fishing regimes along the coast of central Chile," PLOS ONE, Public Library of Science, vol. 12(5), pages 1-18, May.
    • Handle: RePEc:plo:pone00:0176758
    DOI: 10.1371/journal.pone.0176758
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    References listed on IDEAS

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