Abstract
The rates and patterns of feeding and displacement of predators constitute two of the most important plastic behavioral responses that allow individuals to respond quickly to changes in abundance of their prey, predation risks and to rapid alterations in environmental conditions. In this study, we quantified seasonal and spatial variation in displacement (net changes in location in 12 or 24 h periods) and prey consumed of marked individuals of the keystone seastar Heliaster helianthus at six sites spanning 600 km along the coast of north-central Chile. We evaluated the hypotheses that: (1) at sites with low availability (cover) of the main prey, the mussel Perumytilus purpuratus, Heliaster displays larger displacements and consumes a greater proportion of other prey (e.g. mobile species) than at sites with high mussel cover, (2) daily displacements will be correlated with sea surface temperature (SST) and (3) increased wave action will reduce seastar daily displacement. Our results show that Heliaster displacement is higher at sites with lower availability of P. purpuratus; and at these sites, a larger proportion of Heliaster individuals are observed feeding, mostly on other prey (e.g. limpets), which could offset the higher costs associated with increased movement. In addition, wave forces affected the activity of Heliaster negatively. Contrary to our expectations, the daily displacements did not show any relationship with SST measured on the day or the previous days of the surveys, despite the fact that average displacement was generally higher in summer than in winter months. Future studies should examine Heliaster movement during single foraging excursions and determine whether these responses affect the growth and reproductive output of individuals. Such information is vital to understand how changes in prey abundance and environmental conditions alter the behavior and energy budget of this predator and its ability to control prey populations.
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Acknowledgments
We are in debt to a number of friends and students who assisted us in the field, including Tatiana Manzur, Fredy Veliz, Joan Escobar, Alfredo Astorga, Elliott Ramos and Maurin Murua. Thanks to the grants Fondecyt # 1040787 and # 1070335 for making this study possible. Comments by Evie Wieters and Randy Finke improved this manuscript. Three anonymous reviewers provided cogent criticism that substantially improved the presentation. Funding for the long time series of mussel and barnacle recruitment at all sites was provided by Fondap-Fondecyt 15001-001 to the Center for Advanced Studies in Ecology and Biodiversity and the Andrew Mellon Foundation, for which we are most thankful.
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Barahona, M., Navarrete, S.A. Movement patterns of the seastar Heliaster helianthus in central Chile: relationship with environmental conditions and prey availability. Mar Biol 157, 647–661 (2010). https://doi.org/10.1007/s00227-009-1350-7
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DOI: https://doi.org/10.1007/s00227-009-1350-7