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Challenges for assessing vertebrate diversity in turbid Saharan water-bodies using environmental DNA.
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- Author(s): Egeter, Bastian; Peixoto, Sara; Brito, José C.; Jarman, Simon; Puppo, Pamela; Velo-Antón, Guillermo; Pochon, Xavier
- Source:
Genome; 2018, Vol. 61 Issue 11, p807-814, 8p- Subject Terms:
- Source:
- Additional Information
- Abstract: The Sahara desert is the largest warm desert in the world and a poorly explored area. Small water-bodies occur across the desert and are crucial habitats for vertebrate biodiversity. Environmental DNA (eDNA) is a powerful tool for species detection and is being increasingly used to conduct biodiversity assessments. However, there are a number of difficulties with sampling eDNA from such turbid water-bodies and it is often not feasible to rely on electrical tools in remote desert environments. We trialled a manually powered filtering method in Mauritania, using pre-filtration to circumvent problems posed by turbid water in remote arid areas. From nine vertebrate species expected in the water-bodies, four were detected visually, two via metabarcoding, and one via both methods. Difficulties filtering turbid water led to severe constraints, limiting the sampling protocol to only one sampling point per study site, which alone may largely explain why many of the expected vertebrate species were not detected. The amplification of human DNA using general vertebrate primers is also likely to have contributed to the low number of taxa identified. Here we highlight a number of challenges that need to be overcome to successfully conduct metabarcoding eDNA studies for vertebrates in desert environments in Africa. [ABSTRACT FROM AUTHOR]
- Abstract: Le désert du Sahara est le plus chaud au monde et constitue une région peu explorée. De petits plans d'eau sont présents dans le désert et sont des habitats cruciaux pour la biodiversité des vertébrés. L'ADN environnemental (ADNe) est un outil puissant pour la détection des espèces et il est de plus en plus employé pour réaliser des mesures de la biodiversité. Cependant, il existe plusieurs difficultés liées à l'échantillonnage de l' ADNe au sein de tels plans d'eau troubles et il est souvent impossible d'avoir recours à des outils électriques dans des environnements désertiques isolés. Les auteurs ont mis à l'essai une méthode de filtration manuelle en Mauritanie et ont fait appel à une pré-filtration pour contourner les problèmes liés à l'eau trouble dans les régions arides éloignées. Des neuf espèces de vertébrés attendues au sein des plans d'eau, quatre ont été détectées visuellement, deux via méta-codage à barres et une via les deux approches. Des difficultés liées à la filtration de l'eau trouble ont entraîné de nombreuses contraintes, limitant le protocole d'échantillonnage à un seul par site ce qui peut expliquer que plusieurs des espèces attendues n'aient pas été détectées. L'amplification d'ADN humain à l'aide d'amorces génériques pour vertébrés pourrait aussi avoir contribué au faible nombre de taxons identifiés. Dans ce travail, les auteurs soulignent plusieurs défis qu'il faudra surmonter pour réaliser avec succès des études de méta-codage à barres de l' ADNe chez les vertébrés dans les environnements désertiques de l'Afrique. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Genome is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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