Benthic macroinvertebrate assemblages, environmental variables, and associated mine density were evaluated during the summer of 2000 at 18 reference and test sites in the Coeur d’Alene and St. Regis River basins, northwestern USA as part of the US Geological Survey’s National WaterQuality Assessment Program. Concentrations of Cd, Pb, and Zn in water and (or) streambed sediment at test sites in ...

A useful approximation to the Rayleigh reflection coefficient for two half-spaces composed of water over sediment is derived. This exhibits dependence on angle that may deviate considerably from linear in the interval between grazing and critical. It shows that the non-linearity can be expressed as a separate function that multiplies the linear loss coefficient. This non-linearity term depends ...

The basic ecology of seagrass beds was investigated by comparing biomass, productivity and density of Thalassia testudinum (turtle grass) at three sites: Puerto Vargas, Punta Cahuita and Rio Perezoso, in Cahuita National Park, Limón, Costa Rica, over a two month period (March-April 1999). Above ground biomass, density, and productivity were highest in the Puerto Vargas site while Punta Cahuita ...

(OMZ) during the 2003 intermonsoon (March–May) and late-post-monsoon (August–October) periods. Objectives were to compare patterns with those described from other OMZs, particularly the Oman margin of the Arabian Sea, in order to assess the relative influence of bottom-water oxygenation and sediment organic content on macrofaunal standing stock and community structure. Macrofaunal density was h...

Positive plant–animal interactions are important in community ecology, but relatively little attention has been paid to their eVect on the production of mangroves, dominant halophytic trees in tropical coastal marshes. Here, the role of Wddler crab (Uca spp.) burrowing on the growth and production of the white mangrove, Laguncularia racemosa (<2 years old), was examined in a restored marsh in T...

today fingerprinting techniques are increasingly adopted as an alternative and more direct and reliable means of assembling sediment source information. one of the principal assumptions of sediment fingerprinting is that potential catchment sediment sources can be distinguished on the basis of their physical, geochemical and biological properties or fingerprint properties. however, while the so...

A coupled 3D-baroclinic hydrodynamic and cohesive sediment transport model applied to the Western Scheldt estuary is presented. The use of the two-fold sigma coordinate considerably improves the results on intertidal zones. The simulations provide an insight into the effetcs of stratification and its tidal asymmetry into the sediment transport. The calculated density current show an intensity t...

nonenzymatic glycation of low density lipoprotein (ldl) is a reaction of glucose and other reducing sugars with apolipoprotein b100 (apo-b100) lysine residues. in diabetes, this reaction is greatly accelerated and is important in the pathogenesis of diabetic complications. the objective of this study was to investigate in vitro effects of ?-tocopherol, ascorbic acid and lycopene on ldl glycatio...