4.5 Article

Detection of the Endangered Stone Crayfish Austropotamobius torrentium (Schrank, 1803) and Its Congeneric A. pallipes in Its Last Italian Biotope by eDNA Analysis

Journal

DIVERSITY-BASEL
Volume 14, Issue 3, Pages -

Publisher

MDPI
DOI: 10.3390/d14030205

Keywords

Austropotamobius torrentium; Austropotamobius pallipes; detection; conservation; environmental DNA; eDNA; crayfish monitoring; 16S rRNA

Funding

  1. Friuli Venezia Giulia Region
  2. Slovenian Research Agency [P1-0255, J1-3015]

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This study developed and validated species-specific assays based on hydrolysis probe chemistry to detect the presence of the stone crayfish and the white-clawed crayfish in water samples. The results confirmed the presence of the stone crayfish at several sites, including some where it was detected for the first time. Additionally, the method successfully detected the presence of the white-clawed crayfish.
The stone crayfish, Austropotamobius torrentium, is a European freshwater crayfish. Although this species is relatively widespread throughout the continent, it is undergoing significant declines throughout its range. However, as the decline rates have not been quantified in detail, this species is classified as data deficient by the IUCN Red List of Threatened Species. The present study describes the development and validation of two species-specific assays based on hydrolysis probe chemistry for the detection of A. torrentium and A. pallipes environmental DNA (eDNA) in water samples collected in the Julian Alps of Italy (Friuli Venezia Giulia). The eDNA-based method was applied to 14 sites within the Danubian Slizza basin, known to be inhabited by A. torrentium, but with insufficient information on their distribution. In addition, one station in the Tagliamento River basin was sampled to test the performance of the A. pallipes probe. The presence of A. torrentium is confirmed at 6 out of 15 sites. At four of these sites, A. torrentium is detected for the first time. In contrast, the presence of A. torrentium was not detected at two sites already known to harbour the species. Finally, the presence of A. pallipes was confirmed in the station belonging to the Tagliamento basin. The methodology described, which allows the distinction between the two species, paves the way for the parallel detection of the stone crayfish and the white-clawed crayfish (A. pallipes) through eDNA analysis.

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