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Shell remains as indicators of predatory activity in shallow benthic communities of San Sebastián Bay, Southern South America
Published online by Cambridge University Press: 27 August 2025
Abstract
San Sebastián Bay, in southern South America, is an emblematic area because it represents a conflict of interest between the conservation of migratory birds and marine species and the exploitation of hydrocarbons. Given the little information available about the intertidal benthic communities in this bay, this study aims to analyse shell assemblages recovered from the beach, examining drilling and crushing predation on mollusc shells. Two bivalves, Darina solenoides and Mactra fuegiensis, are being preyed upon by three potential drilling predators: the naticid Falsilunatia limbata and the muricids Xymenopsis muriciformis and Trophon geversianus. The intensity of drilling predation was high in both bivalve prey, being higher in M. fuegiensis (27.4%) than in D. solenoides (18.8%). Additionally, there was no preference observed for a particular prey size and there was also no significant correlation between the size of the prey and the predator. However, site selectivity indicated that the predator showed a preference for the central sector in D. solenoides and the umbonal sector in M. fuegiensis, that could be explained by the life modes of both prey and how they are manipulated by their predators. Finally, regarding crushing predation, the shell condition of a significant number of muricids indicates damage most probably caused by decapod crabs. This work provides valuable insights into the biotic interactions within the intertidal communities of San Sebastián Bay, located in the cold-temperate Magellanic Region. It highlights the necessity for continued research and monitoring, particularly in an already conflictive context aggravated by climate change.
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- © The Author(s), 2025. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom.
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