Journal
MARINE POLLUTION BULLETIN
Volume 167, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2021.112262
Keywords
Tunicate; Invasive species; Introduced species; Biological invasion; Rapid assessment survey; Caribbean
Funding
- Puerto Rico Sea Grant [R/103-1-18]
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Ascidians are an ideal taxon for studying invasion processes, requiring anthropogenic introduction vectors for long-distance dispersal. A survey of 11 harbors around Puerto Rico in March 2019 identified 47 ascidian species, including introduced, cryptogenic, and native species. Ascidian community structure did not vary significantly across geographic locations, but marina size had a significant impact on species richness and composition.
Ascidians are an ideal taxon to study invasion processes: they require anthropogenic introduction vectors for long-distance dispersal, are easy to collect and monitor, and are abundant on artificial substrates. In March 2019 we surveyed 11 harbors around Puerto Rico and recorded 47 ascidian species. Eleven of these were only identified to the genus level or above based on morphological or genetic characterization. The remaining 36 species were classified as: 11 introduced (7 with worldwide distributions), 13 cryptogenic, and 12 native. We report the occurrence of Phallusia cf. philippinensis in the Atlantic for the first time. Ascidian community structure did not differ significantly across geographic locations and distances between marinas, while marina size had a significant effect on species richness and composition. Stakeholder involvement and periodic monitoring efforts are essential to detect the arrival of new species and the spread of already introduced ones to natural habitats.
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