Mapping a super-invader in a biodiversity hotspot, an eDNA-based success story
Journal article
Authors | Baudry, Thomas, Mauvisseau, Quentin, Goût, Jean-Pierre, Arqué, Alexandre, Delaunay, Carine, Smith-Ravin, Juliette, Sweet, Michael and Grandjean, Frédéric |
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Abstract | The lesser Antilles archipelago in the Caribbean is known as a biodiversity hotspot, hosting many endemic species. However, recent introduction of a highly invasive species, the Australian redclaw crayfish (Cherax quadricarinatus), has led to significant threats to this fragile ecosystem. Here we developed, validated, and optimized a species-specific eDNA-based detection protocol targeting the 16S region of the mitochondrial gene of C. quadricarinatus. Our aim was to assess the crayfish distribution across Martinique Island. Our developed assay was species-specific and showed high sensitivity in laboratory, mesocosm and field conditions. A significant and positive correlation was found between species biomass, detection probability and efficiency through mesocosm experiments. Moreover, we found eDNA persisted up to 23 days in tropical freshwaters. We investigated a total of 83 locations, spread over 53 rivers and two closed water basins using our novel eDNA assay and traditional trapping, the latter, undertaken to confirm the reliability of the molecular-based detection method. Overall, we detected C. quadricarinatus at 47 locations using eDNA and 28 using traditional trapping, all positive trapping sites were positive for eDNA. We found that eDNA-based monitoring was less time-consuming and less influenced by the crayfishes often patchy distributions, proving a more reliable tool for future large-scale surveys. The clear threat and worrying distribution of this invasive species is particularly alarming as the archipelago belongs to one of the 25 identified biodiversity hotspots on Earth. |
Keywords | Ecology; General Decision Sciences; Ecology, Evolution, Behavior and Systematics |
Year | 2021 |
Journal | Ecological Indicators |
Journal citation | 126, pp. 1-9 |
Publisher | Elsevier BV |
ISSN | 1470-160X |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ecolind.2021.107637 |
Web address (URL) | https://doi.org/10.1016/j.ecolind.2021.107637 |
hdl:10545/625715 | |
Output status | Published |
Publication dates | 02 Apr 2021 |
Publication process dates | |
Deposited | 16 Apr 2021, 08:31 |
Accepted | 17 Mar 2021 |
Rights | © 2021 The Authors. Published by Elsevier Ltd. |
Contributors | Route de la Pointe de Jaham - BP7212, Schoelcher 97274, Martinique, France, Fort-de-France, Martinique, France, Laboratoire Ecologie et Biologie des Interactions, Poitiers Cedex, France, Université des Antilles, Campus de Schoelcher, Martinique, France, Natural History Museum, University of Oslo, Oslo, Norway and University of Derby |
File | File Access Level Restricted |
File | License File Access Level Open |
https://repository.derby.ac.uk/item/94vyx/mapping-a-super-invader-in-a-biodiversity-hotspot-an-edna-based-success-story
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