Abstract
Although the ecological importance and impact of non-indigenous species is increasingly recognised and documented in shallow water ecosystems, their presence beyond the shelf has scarcely been documented. A survey of the upper slope biota of the Mediterranean coast of Israel revealed the presence at 200-m depth of individuals of three Erythraean species, the crocodile toothfish Champsodon nudivittis, Golani’s round herring Etrumeus golanii, and the burrowing goby, Trypauchen vagina. In the past decade several Erythraean species, some newly arrived, some well-established, have been collected on the Levantine lower shelf and upper slope. The species invasion revealed that thermal niche estimations based on the species’ native environment may have underestimated their ability to tolerate lower temperatures. The results reported here suggest that the wide thermal tolerance of some Erythraean species may facilitate their bathymetric and geographic expansion. Their spread to the depths where the unique, diverse and fragile mesophotic ‘animal forests’ occur, bodes ill to these beleaguered communities.
Highlights
In the coastal ecosystems of the Mediterranean Sea, bioinvasions present threats to the local biodiversity comparable to those exerted by climate change, pollution and fisheries (Micheli et al 2013; EEA 2015; Galil et al 2018)
The results reported here suggest that the wide thermal tolerance of some Erythraean species may facilitate their bathymetric and geographic expansion
The number of non-indigenous species (NIS) more than doubled in the past 30 years, and is substantially greater in the Levant than in other basins in the Mediterranean due to the propagule pressure exerted by the Suez Canal, which serves as the major pathway of introduction
Summary
In the coastal ecosystems of the Mediterranean Sea, bioinvasions present threats to the local biodiversity comparable to those exerted by climate change, pollution and fisheries (Micheli et al 2013; EEA 2015; Galil et al 2018). M. Goren The Steinhardt Museum of Natural History, and School of Zoology, Tel Aviv University, Tel Aviv 69978, Israel nudivittis, Golani’s round herring Etrumeus golanii, and the burrowing goby, Trypauchen vagina.
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