Vous êtes ici :
Spatial distribution of an eel population (Anguilla anguilla L.) in a small coastal catchment of northern Brittany (France). Consequences of hydraulic works
The Frémur is a 60 km2 catchment of Brittany where many hydraulic works (dams, weirs, gauging structures, etc.) have reduced the recruitment by elvers and glass eels since at least 50 years. In 1992, an eel lift was built on the main dam (14 m high) and in 1996, two other dams (5 m high) located downstream were equipped with eel passes to improve upstream migration. In 1995, before the construction of the passes, eel population parameters (density, biomass and size distribution) were assessed at the scale of the whole watershed by electrofishing (removal method) in 33 stations. The average biomass was high (19 g/m2 ) despite the numerous physical obstructions. However, there was an accumulation of eels downstream many hydraulic works and very low densities immediately upstream. Moreover, downstream the first obstruction, at 2 km from the sea, the population is dominated by boot lace eels and elvers (< 100 mm), whereas this size class is absent in upstream reaches. These results suggest that the standing capacity of the watershed is not reached and that the population could be enhanced in the next years by the recently installed eel passes.
Auteurs du document :
E. FEUNTEUN, A. ACOU, J. GUILLOUËT, P. LAFFAILLE, A. LEGAULTObtenir le document :
EDP SciencesMots clés :
anguilla anguilla, biomass, size distribution, hydraulic work, stock management, anguilla anguilla, biomasse, structure de taille, amenagement hydraulique, gestion des stocksThème (issu du Text Mining) :
MILIEU NATUREL, FAUNEDate :
2008-08-01Format :
text/xmlSource :
https://doi.org/10.1051/kmae:1998038Langue :
AnglaisTélécharger les documents :
Un permalien est l'URL initiale d'un article ou d'une page, conçu pour refèrer un élément d'information et rester inchangé de façon permanente.Permalien :
https://www.documentation.eauetbiodiversite.fr/notice/spatial-distribution-of-an-eel-population-anguilla-anguilla-l-in-a-small-coastal-catchment-of-northe0
Evaluer cette notice:
Ce portail, créé et géré par l'Office International de l'Eau (OiEau), est géré avec l'appui de l’Office français de la biodiversité (OFB)
Ce portail, créé et géré par l'Office International de l'Eau (OiEAU), est géré avec l'appui de l’Office français de la biodiversité (OFB)