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Introduced species in Mediterranean marine caves: an increasing but neglected threat
Gerovasileiou, V.; Bancila, R.I.; Katsanevakis, S.; Zenetos, A. (2022). Introduced species in Mediterranean marine caves: an increasing but neglected threat. Mediterr. Mar. Sci. 23(4): 995-1005. https://dx.doi.org/10.12681/mms.31284
In: Mediterranean Marine Science. National Centre for Marine Research: Athina. ISSN 1108-393X; e-ISSN 1791-6763, meer
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| Author keywords |
Alien species; non-indigenous species; sea caves; Mediterranean Sea |
| Auteurs | | Top |
- Gerovasileiou, V., meer
- Bancila, R.I.
- Katsanevakis, S.
- Zenetos, A., meer
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| Abstract |
Marine caves are protected habitats with high biodiversity and low ecological resilience, vulnerable to multiple pressures including biological invasions. Therefore, comprehensive lists of alien species in sea caves and assessments of their impacts are urgently needed. This study aimed to provide an updated and validated list of introduced species in marine caves of the Mediterranean Sea based on the latest available checklist (2014). The number of introduced species in the updated list (December 2022 status) has doubled in the last eight years. The updated checklist includes 126 species (107 alien, 15 cryptogenic, two crypto-expanding, and two questionable) belonging to 12 phyla. The highest number of introduced species in caves was evidenced in the eastern Mediterranean (105), specifically in the Levantine (99) and the Aegean (34) ecoregions. Most introduced species originated from the Indo-Pacific. Most species entered the Mediterranean Sea through the Suez Canal, followed by species transferred via vessels. Most introduced species were found at the entrance and in the semi-dark zone of caves (60 and 52 species, respectively), with only 19 species being reported from the dark zone. Approximately 28% of the introduced species have a high impact on ecosystems, including nine of the ten worst invasive species in the Mediterranean Sea. Despite the lack of data on the impact of introduced species on marine cave biodiversity, given their high species richness and the recently reported population explosions of some alien fish in the eastern Mediterranean, our results highlight the need for continuous inventorying and monitoring. |
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