The influence of environmental factors on the abundance and recruitment of the sand crab Emerita analoga (Stimpson 1857): Source–sink dynamics? |
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| Institution: | 1. PhD program in Agricultural Sciences, Faculty of Agronomy and Forestry, Pontificia Universidad Católica de Chile, Santiago, Chile;2. Department of Ecosystems and Environment, Faculty of Agronomy and Forestry, Pontificia Universidad Católica de Chile, Santiago, Chile;3. Interdisciplinary Center for Aquaculture Research (INCAR), Universidad de Concepción, Concepción, Chile;5. Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Chile;6. Department of Ecology, Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile |
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| Abstract: | The sandcrab Emerita analoga is the dominant species inhabiting sandy beaches along the Pacific coast of the American continent. In our study, 10 sandy beaches were sampled seasonally from 2006 to 2011, including coastal planktonic sampling from 2006 to 2008. Two major population cores were detected, the first one in the northern part of the study area and the second in the area immediately to the south of the Itata River mouth. Zoeal stages were found along the entire coastal zone. Highest densities and recruitment were found during spring and summer of each year. PLS regression indicated that source–sink habitat proxies correlated positively with morphodynamic parameters; while beach slope and total organic matter were negatively correlated. These results agree with the source–sink hypothesis, finding higher densities of adults, recruits and cohort recurrence on open coast beaches with milder physical dynamics. Furthermore, a hypoxic event and a mega-earthquake/tsunami negatively affected recruitment at the inter-annual scale. |
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| Keywords: | Sandy beach Seasonality Life history Larval supply Settlement Connectivity |
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