Coastal storm risks have been increasing over the last couple of decades, affecting both marine infrastructure and human security. Nevertheless, the ecological impact on intertidal marine fishes has not been addressed yet. We carried out a field experiment during austral summer 2018, using statistical wave parameters, characterizing coastal storms as a factor, and the gut content of two sympatric intertidal triplefins, Helcogrammoides chilensis and Helcogrammoides cunninghami, as a proxy for trophic interactions. Three locations were sampled before and after the arrival of three consecutive summer coastal storm events. From all gut contents, a total of 16,597 prey items were found. Both species are micro-carnivorous, predating mostly on harpacticoid copepods, amphipods and chironomid larvae, without significant differences in prey composition with the passing of the summer coastal storms. However, after coastal storms, heavier-at-length fish (0.05–0.5 g weight gain) were found in the intertidal. Indeed, after the impact of the coastal storms, H. chilensis increased their ingestion of larger prey (amphipods, chironomid larvae), while H. cunninghami decreased the number of prey ingested. When compared between species, the feeding success after the passing of coastal storms was greater for H. chilensis than H. cunninghami. Finally, trophic overlap between species was high, but after the coastal storms passed, it decreased noticeably due to small changes in proportion of large chironomid and gammarid amphipods in the diet. Therefore, summer coastal storms affected the foraging behavior, increasing the weight of two recurrent cryptobenthic rocky reef fish from central Chile. In a broader ecological context, the shift from pelagic (i.e., copepods) to benthic prey (i.e., amphipods, polychaetes) may change the relative contribution and the subsidy production in nearshore habitats via pelagic-benthic coupling.
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We appreciate the field work done by Daniela Plaza, Christina DÃaz and Yanara Figueroa, who helped in the collection of triplefin. We deeply thank Mauricio Molina and Sebastian Correa for their aid in generating the wave data from the database Sistemas de Alerta de Marejadas (https://marejadas.uv.cl) and to ANID's Grant ID20I10404 “Desarrollo de una escala de impacto de marejadas para la comunicación efectiva y disminución del riesgo de desastre”.
This research was partially funded by Comisión Nacional de Investigación Científica y Tecnológica (CONICYT Chile, now Agencia Nacional de Investigación y Desarrollo, ANID) grant FONDECYT 1150296 to MFL, grant FONDAP 15110017 to PWG, and funded by Universidad de Valparaiso’s project CIDI 12, Centro de Observación Marino para Estudios de Riesgos del Ambiente Costero (COSTA-R).
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Polanco-Pérez, J., Search, F.V., Winckler, P. et al. Unexpected effects of coastal storms on trophic ecology of two rocky reef fish species. Mar Biol 168, 20 (2021). https://doi.org/10.1007/s00227-021-03827-w