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Invasive coral Tubastraea spp. population growth in artificial habitats and its consequences to the diversity of benthic organisms

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Abstract

Marinas create physical and biotic conditions distinct from those in natural habitats which can facilitate the establishment of non-indigenous species (NIS) in coastal ecosystems. Using a series of images spanning nine years, we detected the introduction and followed the expansion of the NIS Tubastraea coccinea and T. tagusensis populations at a recreational marina in a region of Southeastern Brazil where sun-corals are rarely found on natural substrates. Because sun corals are known to reduce diversity in natural invaded environments, we evaluated how different densities of sun-corals affected the benthic community. Overall, the NIS populations have grown exponentially from 2010 to 2019 inside the marina, occupying up to 60% of the available space. However, the population growth in the breakwater stopped in 2016. Local variation in the population growth across the marina might be associated with the high phytoplankton biomass and larval retention inside the marina, which are results of the lower hydrodynamics. The expansion of sun-coral coverage did not significantly affect the richness of benthic communities but was associated with a reduction of the native bryozoan Amathia brasiliensis, the overall abundance of mobile crustaceans, and an increase in the area covered by the exotic bryozoan S. errata. The fast substitution of a native ecosystem engineer for a NIS suggests signs of invasion meltdown associated with the expansion of Tubastraea spp.

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Fig. 1

Adapted from Oricchio et al. (2016)

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Acknowledgements

This study was funded by the Scientific Initiation Program of the Federal University of ABC through Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP Grant 2016/17647-5). We thank Yacht Clube Ilhabela and Centro de Biologia Marinha da USP for logistical support, Sergio Coelho Souza, Felipe Theocharides Oricchio and Edson Vieira Filho for field assistance, Aurea Maria Ciotti for sharing information on phytoplankton biomass at the studied region, Nadia Harripersaud for English spelling and grammar review, the current members of the Experimental Marine Ecology Research group and two anonymous reviewers for suggestions and helpful critiques.

Funding

The study was funded by the Scientific Initiation Program of the Federal University of ABC through Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP Grant 2016/17647-5).

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Contributions

RMT, MVK and GMD conceived and designed research. RMT, MVK and GMD conducted field sampling. RMT and GMD analyzed data. RMT wrote the manuscript. All authors read and approved the manuscript.

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Correspondence to Rodrigo M. Tanasovici.

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Conflict of interest

RMT received funding from the Scientific Initiation Program of the Federal University of ABC through Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). GMD received research funding from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP Grant 2016/17647-5). The authors declare that they have no other conflict of interest.

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This study was reviewed by the Universidade Federal do ABC Research Ethics Committee and no ethical approval was required. All applicable international, national, and/or institutional guidelines for sampling, care, and experimental use of organisms for the study were followed.

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Tanasovici, R.M., Kitahara, M.V. & Dias, G.M. Invasive coral Tubastraea spp. population growth in artificial habitats and its consequences to the diversity of benthic organisms. Mar Biol 167, 119 (2020). https://doi.org/10.1007/s00227-020-03734-6

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  • DOI: https://doi.org/10.1007/s00227-020-03734-6

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