Mapping a super-invader in a biodiversity hotspot, an eDNA-based success story

Baudry, Thomas; Mauvisseau, Quentin; Gout, Jean-Pierre; Arqué, Alexandre; Delaunay, Carine; Smith-Ravin, Juliette; Sweet, Michael; Grandjean, Frédéric

doi:10.1016/j.ecolind.2021.107637

Cited by 28 publications

(39 citation statements)

References 44 publications

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“…The four sites were selected according to a CLD-gradient of contamination, representing the main CLD concentrations measured in Martinique rivers where crayfish populations were observed (Baudry et al, 2021). These four sites were: a non-contaminated site, corresponding to the hatchery (CLD concentration in the water < limit of detection (LOD)), a low contaminated site "Manzo" (below quantification limit 0.03 μg.L − 1 ), an intermediate station on the Coulisses stream (annual mean 0.45 μg.L − 1 ) and a highly contaminated station, on the Lezarde river (annual mean 2.48 μg.L − 1 ).…”

Section: Is Cld Bioaccumulated In Wild Crayfish?mentioning

confidence: 99%

“…Moreover, this practice is also very lucrative: C. quadricarinatus can be sold for up to 25€/kg as it is considered a luxury gourmet product. This species is now found and fished in high densities in several martinican rivers (Baudry et al, 2021). The majority of rivers inhabit by C. quadricarinatus are polluted by CLD beyond the potability thresholds set by the Regional Health Agency (0.1 μg.L − 1 ) or even well above 0.2 μg.L − 1 , which is an exposure concentration resulting in the MRL being exceeded in crayfish muscle, according to our study (Fig.…”

Section: Risks For Consumersmentioning

confidence: 99%

“…Cherax quadricarinatus was finally introduced to the island in the early 2000s, from Cuba, in order to reinvigorate this sector (Baudry et al, 2020). Following intentional releases, crayfish were found in the natural environment and, thanks to their high dispersal capacity and its high tolerance of environmental quality, were able to colonize a large part of the island's river systems (Baudry et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Colored points correspond to these stations, darker points indicate more polluted stations. Invaded watersheds by Cherax quadricarinatus are highlighted by red dotted lines, from data in Baudry et al (2021). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)…”

Section: Introductionmentioning

confidence: 99%

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The invasive crayfish Cherax quadricarinatus facing chlordecone in Martinique: Bioaccumulation and depuration study

et al. 2022

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Section: Is Cld Bioaccumulated In Wild Crayfish?mentioning

confidence: 99%

Section: Risks For Consumersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The invasive crayfish Cherax quadricarinatus facing chlordecone in Martinique: Bioaccumulation and depuration study

et al. 2022

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“…For example, they require large sampling efforts are time consuming, ecologically invasive, and often lead to an underestimation of species distribution, especially when population densities are low (Hänfling et al, 2016;Manfrin et al, 2019;Robinson et al, 2018). In recent years, the use of environmental DNA (eDNA) has become increasingly popular as it is often reported as being equally if not more reliable, faster, and cheaper when attempting to monitor the distribution of a wide range of aquatic organisms (Baudry et al, 2021;Troth et al, 2020;Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The development of early monitoring tools to detect aquatic invasive species: eDNA assay development and the case of the armored catfish Hypostomus robinii

et al. 2021

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Introductions of invasive non‐native species (and their subsequent impacts) are recognized as a major threat to native flora and fauna. This is especially true in island ecosystems such as the tropical island of Martinique. In 2018, one such aquatic invasive species, the suckermouth catfish Hypostomus robinii (Loricariidae), was reported for the first time in two of the islands rivers. H. robinii is a popular freshwater aquarium fish and native to tropical and sub‐tropical South America. Since its initial discovery, a growing number of populations have been found, suggesting a larger distribution of this species through Martinique's hydrographic network. Here, we developed a novel survey technique (utilizing environmental DNA) and conducted a widespread survey across the island to assess the distribution of this invasive species. We were able to detect H. robinii in 22% of sites surveyed (18 out of 83) via our eDNA‐based assay. The presence of these fish was confirmed using traditional trapping at 14 of these sites. Additionally, we used occupancy modeling to investigate the impact of different environmental covariates on the detection efficiency of the novel assay and the potential impacts of false positives and negatives. We highlight a decrease in the detection probability when water volume filtered increases. That said, the eDNA‐based method proves a useful tool for the detection of this invasive fish species and monitoring its spread for management purposes.

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Environmental DNA survey to detect an endemic cryptic fish, Anablepsoides cryptocallus, in tropical freshwater streams

Baudry

Mauvisseau

Arqué

et al. 2023

Aquatic Conservation

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Martinique island is a biodiversity hotspot in the Lesser Antilles that harbours many endemic species. One of these, Anablepsoides cryptocallus, also known as ‘Poisson gale’, is the only endemic freshwater fish of Martinique and a species with a poorly understood distribution range. In this study, an environmental DNA (eDNA) detection protocol was developed, validated, and optimized, targeting a short fragment (125 bp) of the A. cryptocallus COI mitochondrial gene, to investigate the presence of this species in Martinique. Fifty‐seven sites spread over 43 permanent rivers and two wetlands were sampled using both eDNA and conventional fishing (dip net capture). Presence was confirmed in 27 sites using eDNA detection, and in nine sites by dip net fishing. eDNA‐based detection of A. cryptocallus was effective and less time‐consuming than conventional fishing, making it a relevant tool for future studies throughout the island. Even though A. cryptocallus was found to be present in a significant number of sites, many sites previously known for this species were found to be negative, highlighting the need for continuous monitoring. There is now an urgent need to propose protection status for this endemic species to preserve its preferential habitats, as these are being increasingly threatened by human activities that are leading to habitat loss and fragmentation.

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Mapping a super-invader in a biodiversity hotspot, an eDNA-based success story

Cited by 28 publications

References 44 publications

The invasive crayfish Cherax quadricarinatus facing chlordecone in Martinique: Bioaccumulation and depuration study

The invasive crayfish Cherax quadricarinatus facing chlordecone in Martinique: Bioaccumulation and depuration study

The development of early monitoring tools to detect aquatic invasive species: eDNA assay development and the case of the armored catfish Hypostomus robinii

Environmental DNA survey to detect an endemic cryptic fish, Anablepsoides cryptocallus, in tropical freshwater streams

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