For the first time, radio-tracking observations were made over 24 h cycles during the growing season to quantify the habitat use and home range of Zingel asper, a critically endangered fish species, endemic to the Rhône River with a high risk of extinction (IUCN). New advances in radio telemetry with regard to the size of tags provided an opportunity to collect behavioural and habitat use information while remaining non-lethal. Zingel asper was characterized by small ranges of habitat use and, contrary to previous assumptions, the species was diurnal as illustrated by a smaller home range during the night than during daytime.
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DNA metabarcoding suggests adaptive seasonal variation of individual trophic traits in a critically endangered fish.
Mol Ecol
November 2022
Aix Marseille Université, CNRS, IRD, Avignon Université, IMBE, Marseille, France.
Dietary studies are critical for understanding foraging strategies and have important applications in conservation and habitat management. We applied a robust metabarcoding protocol to characterize the diet of the critically endangered freshwater fish Zingel asper (the Rhone streber). We conducted modelling and simulation analyses to identify and characterize some of the drivers of individual trophic trait variation in this species.
View Article and Find Full Text PDFReproductive biology of the endangered percid Zingel asper in captivity: a histological description of the male reproductive cycle.
Folia Histochem Cytobiol
March 2012
University of Lyon, General Biology Laboratory, UCLy, Laboratory of Reproduction and Comparative Development, EPHE, Lyon, France.
The endemic Rhodanian percid Zingel asper (Linnaeus, 1758), is usually found throughout the Rhône basin, but this fish is now in sharp decline. Understanding its reproductive physiology is important so as to be able to artificially control its reproduction with a view to re-introducing it. This study was carried out on a population obtained by artificial fertilization and bred in external tanks.
View Article and Find Full Text PDFTwenty-four hours in the life of Zingel asper.
J Fish Biol
August 2009
UMR IMEP 6116, Université Aix-Marseille I, 1 Pl V. Hugo, 13001, Marseille, France.
For the first time, radio-tracking observations were made over 24 h cycles during the growing season to quantify the habitat use and home range of Zingel asper, a critically endangered fish species, endemic to the Rhône River with a high risk of extinction (IUCN). New advances in radio telemetry with regard to the size of tags provided an opportunity to collect behavioural and habitat use information while remaining non-lethal. Zingel asper was characterized by small ranges of habitat use and, contrary to previous assumptions, the species was diurnal as illustrated by a smaller home range during the night than during daytime.
View Article and Find Full Text PDFGenetic structure of fragmented populations of a threatened endemic percid of the Rhône river: Zingel asper.
Heredity (Edinb)
April 2004
Laboratoire d'Ecologie des Hydrosystèmes Fluviaux, UMR CNRS 5023, Université Claude Bernard, 43 bd du 11 Novembre 1918, 69622 Villeurbanne, France.
Zingel asper is an endemic percid of the Rhône basin considered to be critically endangered. This species was continuously distributed throughout the Rhône in 1900, but today only occupies 17% of its initial area. In the present study, five microsatellite loci were used to assess the level of genetic variability within and among populations localized in different sub-basins.
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