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The paper presents a new index for assessing water trophy and organic pollution. It is based on only true aquatic macrophytes – being calculated on species score, coefficient of ecological amplitude and degree of cover. The method was tested in an acidic lowland river and an alkaline mountain river, and is shown to be validated by bio-indication scales(More)
Macrophytes were studied downstream of the Rophémel hydroelectric dam on the River Rance (Côtes d'Armor Department, western France) to assess the effects of hydroelectric functioning on river macrophyte communities. We studied ten representative sections of the hydro-peaking channel on five occasions in 1995 and 1996, on a 15-km stretch of river. Floristic(More)
Biological traits of aquatic and riparian plants were compared among invasive and non-invasive groups of species from both native and exotic taxa in Portuguese fluvial systems. Twenty-six riparian and aquatic species were selected and their frequency of occurrence and foliar percentage cover was analysed at 401 sampling sites on the main catchments of(More)
The aim of this paper is to study the relationships between the physical features of rivers and the distribution of macrophyte vegetation. Field work was undertaken at 207 stations along the Scorff River and its tributaries, a salmon river system in southern Brittany (western France). The physical features were considered using a principal component(More)
The ecological environment of three aquatic rodents was studied in the French Ardennes region. Two species, the coypu (Myocastor coypus) and the common muskrat (Ondatra zibethicus), are invasive. By contrast the native European beaver (Castor fiber) was extirpated from the region, subsequently reintroduced, and currently is protected. The aim of this study(More)
The distribution and invasive status of the amphibious plant Paspalum paspalodes (water knotgrass) are observed. The P. paspalodes distribution clearly shows that it is an invasive plant established in Portugal, which has never before been recorded as invasive in Portugal. The purpose of our study is to determine the various stages of invasion of this plant(More)
This study investigated the consequences of passive ecological restoration on a riparian habitat and on water quality. The restoration plan consists of excluding livestock by constructing fences along an entire stream 1 m from the stream bed, with the assumption that recovering riparian habitat will restore their ecological processes (e.g., filtration, soil(More)
The wastewater from freshwater fish farming is responsible for important water quality modifications in receiving ecosystems. These point source pollution cause local problems for the management of the freshwater environment, especially in salmon rivers. The aim of this paper is to study the relationship between plant communities and environmental factors(More)
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