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Dominant Bivalve in an Exposed Sandy Beach Regulates Community Structure Through Spatial Competition

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Abstract

Fluctuations in abundance of dominant species can cause competitive release of resources with consequences on community structure and functioning. In the present study, changes in the intertidal macroinfauna community of an exposed sandy beach were evaluated during two contrasting periods characterized by low and high densities of the yellow clam Amarilladesma mactroides. The increase in clam abundance and biomass was associated with a significant decrease in abundance of the rest of the community. In particular, a decline was observed for the pea crab Austinixa patagoniensis, a commensal species that lives in the burrows of the shrimp Sergio mirim. Our study demonstrates that fluctuations in clam abundance lead to long-term changes in community structure, suggesting the presence of competitive interactions. The environmental stability over the two periods strengthens the hypothesis that the competition between species is crucial for shaping the ecological community. Stable isotope analysis allows discarding trophic competition as mechanism of exclusion. Image maps reveal complementary distribution of species, showing the relevance of the spatial competition, which is mediated by changes in abundance of a third species. Indeed, high densities of A. mactroides reduce the available area for the establishment of the S. mirim burrows, limiting the foraging behavior of its commensal, the pea crab. Such an interaction drives density-dependent exclusion of the pea crab from the intertidal zone following the establishment of the yellow clam population. This study illustrates that spatial competition triggered by the increase of a bed-forming species can have community-wide consequences in exposed sandy beaches.

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Acknowledgments

We very much appreciate the hard fieldwork of all members of the Benthic Ecology Group of the Argentinian Institute of Oceanography (IADO), especially Juan Pablo Roldán. We thank Thomas Hansen and Cordula Meyer for the valuable contribution on the stable isotope analysis. Special thanks to Ana Martínez and Julieta Carbonella for their assistance in sample preparation and to Martin Amodeo and Celeste López Abbate for their help in data analysis. We also gratefully acknowledge the associate editor and two anonymous reviewers for their suggestions and comments that improved the earlier version of the manuscript.

Funding

This work was financially supported by grants from the National Council of Scientific and Technical Research (PIP-CONICET 112-201301-00362) and from National Agency for Scientific and Technological Promotion (PICT 2017-2738) to SMF. MCC was supported by a doctoral fellowship from the National Council of Scientific and Technical Research (CONICET-Argentina). MI acknowledges financial support of CAPES foundation (Ministry of Education of Brazil) through the Doctoral Programme (process number: 99999.001303/2015-05).

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  1. Instituto Argentino de Oceanografía, Universidad Nacional del Sur, CONICET, IADO, (Camino La Carrindanga km 7,5), Bahía Blanca, Argentina

    M. Cecilia Carcedo, Sandra M. Fiori, M. Sofía Dutto & M. Elizabeth Carbone

  2. Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, (UNS), Bahía Blanca, Argentina

    M. Cecilia Carcedo & Sandra M. Fiori

  3. Research Division Marine Ecology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany

    Marco Scotti & Maysa Ito

  4. Departamento de Geografía y Turismo, Universidad Nacional del Sur, (UNS), Bahía Blanca, Argentina

    M. Elizabeth Carbone

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  1. M. Cecilia Carcedo
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Carcedo, M.C., Fiori, S.M., Scotti, M. et al. Dominant Bivalve in an Exposed Sandy Beach Regulates Community Structure Through Spatial Competition. Estuaries and Coasts 42, 1912–1923 (2019). https://doi.org/10.1007/s12237-019-00622-1

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