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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Consequences of fish farming demise for bird and odonate species richness in french fishponds / Conséquences de la déprise piscicole sur la richesse spécifique des oiseaux et des Odonates dans des étangs de pisciculture français (2018)
Auteurs :	Joël Broyer, Auteur ; Sylvain Richier, Auteur ; Christophe Renaud, Auteur ; Bruno Riotton-Roux, Auteur ; Jean-Yves Vade, Auteur
Type de document :	Article
Dans :	La Terre et la Vie (73(4) 2018)
Article en page(s) :	462-473
Langues:	Anglais
Mots-clés :	France ; Aves ; Odonata ; Pisciculture ; étang ; Agriculture
Résumé :	Fishponds are anthropogenic aquatic ecosystems where biodiversity is shaped by fish farming practices. Little is known on the consequences of fish farming cessation. This study describes the variation of species richness in breeding birds and Odonates, between ponds either managed for fish farming, or abandoned, for 4-10 years or > 10 years, in Sologne (Centre Val-de-Loire region, central France). Bird species richness was primarily favoured by the extent of littoral helophyte belts but this positive effect was not recorded in ponds without fish farming for more than ten years. Four species: the Pochard Aythya ferina, the Tufted Duck Aythya fuligula, the Black-necked Grebe Podiceps nigricollis and the Sedge Warbler Acrocephalus schoenobaenus were more frequently found in ponds still stocked with Carp Cyprinus carpio. Three of them were benthivorous divers. We hypothesized that this could reflect a carp effect on the ecosystem productivity. Our results therefore suggest that fish farming demise may be detrimental to birds even though adequate nesting sites remain available. It should be emphasized however that fish farming productivity is low in Sologne (≤ 150 kg/ha). Our observations therefore could not be extrapolated to fish ponds with intensive fish farming. Odonate richness seems to depend on the development of low emergent vegetation. The absence of carp stocking did not correlate with higher frequency for any species. Conservation of low helophyte belts then seems to be the proper management to meet Odonate requirements.
En ligne :	http://hdl.handle.net/2042/68559

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