Résultat de la recherche

The two brown frogs Rana arvalis and Rana temporaria were monitored at 57 localities (that contained a total of 120 ponds) for up to 17 years each during the years 1989-2005. The analysis summarized belowonly accounts for trends within sites actually usable for frogs during the analysis period, large scale habitat losses are thus not […]

We studied community structure and seasonal’activity patterns in a system of four ponds with seasonally-variable hydrology at a Mediterranean area in central Italy. We used a set of field methods to assess species presence and relative frequency of observation. The network of ponds was inhabited by six species of amphibians, two salamanders and four frogs. […]

Although the designation of biodiversity hotspots is a valuable tool to improve conservation efforts, this is a concept primarily based on species diversity. In consequence, another component of biodiversity, adaptive variation, is often ignored in conservation and to my knowledge no attempt has been made to identify hotspots of remarkable intraspecific patterns. My aim was […]

Despite the importance of community-structuring processes operating at both local’and régional scales, there is relatively little work examining both forces within a single system. I used a combination of observational’and experimental’approaches to examine the processes structuring larval dragonfly distributions in lentic habitats that encompass a gradient of both permanence and top predator type. I compared […]

This study analysed information from national’and régional datasets gathered in Great Britain describing the occurrence of aquatic macroinvertebrates and macrophytes in ponds, ditches, streams, rivers and lakes, across 12 agricultural landscape classes and a 13th class comprising non-agricultural land. The study found major differences in the composition of the invertebrate faunas of running and still […]

Introduced species have become one of the most important anthropogenic impacts in aquatic ecosystems and are implicated in the declines of many native amphibian populations. Despite the effects of introduced fish species on amphibian communities, there is little information concerning the responses of amphibians following the removal of introduced predatory fish. We présent results of […]

The chloroacetamide metazachlor is a commonly used pre-emergent herbicide to inhibit growth of plants especially in rape culture. It occurs in surface and ground water due to spray-drift or run-off in concentrations up to 100 _x0002_gL−1. Direct and indirect effects of metazachlor on aquatic macrophytes were investigated at oligo- to mesotrophic nutrient levels employing eight […]

A water quality study was carried out on 40 irrigation ponds located within the main greenhouse areas on the Almerı?a coast, placing special emphasis on the factors controlling the oxygen dynamics, a relevant aspect with agricultural’and environmental implications. Considering chemical, physical’and biological water characteristics, agricultural irrigation ponds were satisfactorily classified by cluster analysis in four […]

Les mots techniques…2 Bibliographie…2 « Mares, où es-tu ? »…3 La FRAPNA et les mares…3 Histoire de mares…4 L’inventaire des mares de Rhône-Alpes…5 La mare, un écosystème en miniature…6 Quelques éléments de biodiversité…7 Créer sa mare…9 Gérer, restaurer et entretenir sa mare…10 Mares forestières…11 Mares dalpage…12 Mares de bocage…14 Mares de jardins…15 Mares péri-urbaines…17 Mares […]

L’environnement qui nous entoure est composé de différents écosystèmes dont font partie les mares. Pour préserver celles-ci, trop souvent victimes de disparitions causées par la perte de leurs usages (disparition par comblement volontaire d’origine anthropique et par le processus d’atterrissement), le Parc naturel régional des Caps et Marais d’Opale mène depuis 2000 des actions sur […]

L’étude a porté sur l’analyse faunistique, physicochimique et topologique de 46 mares du domaine de Chambord. Les récoltes faunistiques, proportionnelles à la surface de la mare, ont été réalisées à l’aide d’un troubleau filtrant en moyenne 650 litres d’eau. Pour chaque mare, les densités totales ont été mesurées pour tous les individus, pour les coléoptères, […]