La diminution et le déséquilibre de la population piscicole (Salmo trutta fario) sont les conséquences les plus évidentes de l'implantation d'un barrage sur un torrent pyrénéen (débit réservé de 100 1/s avec des lâchers d'eau imprévisibles). ABSTRACT : The reduction and disequilibrium of the fish population (Salmo trutta fario) are the most obvious...
A net bag method has been used to study the decomposition of Salix alba leaves in five Garonne corridor sites (fast running water, slow flowing water, standing water, floodable willow stand, non floodable willow stand). Changes in the contents and the amounts of some leaf litter constituents were assessed over a 40 week period. Willow leaves decomp...
Riverine forests were studied in the River Garonne floodplain as sites of maximum interactions between a river and its valley. A historical perspective was used as an aid to explain present processes. In the floodplain the vegetation dynamics are still largely influenced by floods in contrast with other more industrialized European rivers. Intensiv...
Hydroclimatology and biogeochemistry of the Amazon 2. Geochemical cycles
The colonization of leaf litter (Alnus glutinosa) by aquatic hyphomycetes was studied in a summer cool stream of the French Pyrenees. In spite of the rapid decomposition of leaves, the fungal community exhibited a characteristic successional pattern with three phases. The initial colonization stage was defined by a dense sporulation of the five spe...
SPOT XS oblique data are compared with Landsat Thematic Mapper (TM) vertical data at two different times. Under the assumption that analogous spectral bands are equivalent, the differences in spectral responses observed over land cover classes are attributed to the effects of angular anisotropic reflection. This article shows that land cover classe...
2 Atmospheric Deposition in France and Possible Relation with Forest Decline
Relationship Between Lake-Water Acidification in the Yosges Mountains and SO2 - NO, Emissions in Western Europe
An in situ experiment was conducted in the French Mediterranean littoral (Gulf of Fos) from July 1992 to January 1993 using cores containing defaunated or natural sediment. Particulate tracers (luminophores) and hydrocarbons (Arabian Light crude oil) were deposited at the sediment surface. After 1, 4 and 6 months, luminophore and hydrocarbon (satur...
