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The effects of the nonnative brittle star Ophiothela mirabilis Verrill, 1867 on the feeding performance of an octocoral host in a southwestern Atlantic rocky shore

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Abstract

The Pacific epizoic brittle star Ophiothela mirabilis Verrill, 1867 has widely spread and colonized hosts at high densities along the Western Atlantic. We assessed the impacts of O. mirabilis on the feeding performance of the preferred host Leptogorgia punicea (Milne Edwards and Haime, 1857) through in situ experiments using incubation chambers and estimated its putative effects on the benthic-pelagic coupling processes of a rocky shore system. The feeding rates and heterotrophic carbon inputs of L. punicea treatments with high colonization by O. mirabilis (5.4 ± 0.6 individuals cm−2 of host area; mean ± standard deviation) were compared to host controls naturally without brittle stars. No significant differences in host feeding performance were observed between the control and treatments. Overall, L. punicea ingested 3,047,118 ± 1,843,183 particles g DW (dry weight)−1 h−1, corresponding to 116.1 ± 159.0 µg of carbon (C) g DW−1 h−1. Therefore, although octocorals hosting O. mirabilis may have impaired polyp opening and extension, their feeding performance remains similar. In this sense, the impact of O. mirabilis on the carbon flux of the rocky shore system driven by octocoral ingestion is minimal. The grazing rate of 49.9 ± 68.3 mg C m−2 day−1 highlights the significant role of L. punicea in such benthic-pelagic coupling processes. Notwithstanding, further laboratory and field experimental studies assessing the effects on host taxa with distinct morphological and functional features are needed to better understand the responses of the recipient hard-bottom systems along the Western Atlantic to increasing densities of O. mirabilis.

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Acknowledgements

We are grateful to Rubens Lopes for the use of the Planktonic Systems Laboratory and to Aline Martinez and Luciana Frazão for discussing laboratory techniques and procedures with us. We thank the Center of Marine Studies of Federal University of Paraná for logistical support. Biological samples were studied and collected under Biodiversity Information and Authorization System (SISBIO) license number 68918.

Funding

This study was funded by the Brazilian National Council for Scientific and Technological Development—CNPq (307047/2018–0) through a research grant to PL. PD was funded by the Coordination for the Improvement of Higher Education Personnel (CAPES) social demand scholarship.

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Correspondence to Patrick Derviche.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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The datasets and the R codes of the current study are available in the GitHub repository, https://github.com/pderviche/Ophiothela_mirabilis_Impacts.

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Derviche, P., da Cunha Lana, P. The effects of the nonnative brittle star Ophiothela mirabilis Verrill, 1867 on the feeding performance of an octocoral host in a southwestern Atlantic rocky shore. Biol Invasions 24, 2821–2833 (2022). https://doi.org/10.1007/s10530-022-02815-5

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  • DOI: https://doi.org/10.1007/s10530-022-02815-5

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