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Species diversity and abundance of mobile crustaceans associated with living and dead colonies of the invasive sun coral Tubastraea

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Abstract

The invasive sun corals Tubastraea spp. were introduced to Brazil in the late 1980s. The invasion prompted rapid changes in seascapes and local biological communities by excluding native species, particularly sessile ones. However, little is known about the impact on the mobile invertebrates. Using an experimental approach this study investigated the effects of living and dead sun corals and coral cover (50 vs. 100% covered areas) on the taxonomic composition, diversity (H’) and abundance of reptant and natant macro-crustaceans and tanaids at the species level. Experimental units consisted of 60 tiles measuring 400 cm2, half and fully covered with living or dead corals which were deployed between 3 and 5 m for 12 months on concrete blocks. A total of 1346 specimens of decapods were obtained (27 native and 1 invasive species). 1059 specimens of the tanaid Chondrochelia dubia were sampled. The overall taxonomic composition was neither affected by coral condition (live or dead) nor by coral cover area. The diversity of reptant and natant species responded differently to coral condition and coral cover. The combination of dead corals and full cover accounted for the highest abundance of reptants. Natant abundance was influenced by coral cover area, irrespective of coral condition. The positive relationship between body size and abundance was statistically significant. Abundance of the obligate tube builder C. dubia was favoured by the greater availability of space on blocks half covered by corals. No signs were found of invasion meltdown in the mobile crustacean fauna.

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Acknowledgements

The authors thank Pró-Reitoria de Pesquisa da USP for financial support in the form of a Post-Doctoral Fellowship to ARS (Processo USP: 2021.1.10424.1.9). We acknowledge funding for this study from Petrobras through the Petrobras Environmental Program and the Brazilian Institute for Marine Biodiversity as well as all those who helped in the field, especially Joel Braga and Marcelo Mantelatto. JCC also thanks funding from Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ E-26/010.003031/2014 and E26/203.002/2017) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 305924/2018-4 and 313698/2021-0). MT also thanks CNPq (309488/2020-6) for supporting studies on the systematics and ecology of marine invertebrates. This article is no. 53 from the Projeto Coral-Sol.

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Correspondence to A. R. da Silva.

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Communicated by S.S.S. Sarma.

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da Silva, A.R., Creed, J.C. & Tavares, M. Species diversity and abundance of mobile crustaceans associated with living and dead colonies of the invasive sun coral Tubastraea. Aquat Ecol 57, 529–541 (2023). https://doi.org/10.1007/s10452-023-10027-9

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  • DOI: https://doi.org/10.1007/s10452-023-10027-9

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