The Qu’Appelle Valley drainage system provides water to a third of the population of the Canadian Great Plains, yet is plagued by poor water quality, excess plant growth, and periodic fish kills. Fossil algae (diatoms, pigments) and invertebrates (chironomids) in Pasqua Lake were analyzed by variance partitioning analysis (VPA) to determine the relative importance of climate, resource use, and ...

The Osterseen Lake District in Bavaria consists of 19 small interconnected lakes that exhibit a pronounced trophic gradient from eutrophic to oligotrophic. It therefore presents a unique model system to address ecological questions regarding niche adaptation and Baas Becking's long standing hypothesis of "everything is everywhere, but the environment selects." Here, we present the first assessm...

A physically based, simultaneous air/water constituent algorithm is used for automatic processing of 5 MERIS level 1B FR datasets of Lake Constance. Its sensitivity to the adjacency correction tool ICOL is tested, and compared to variations in the wavelength dependence of aerosols. Further comparisons are made with MERIS NN algorithms for eutrophic lakes and case II waters. Reference data measu...

We present a training set, the database involving physical-chemical water parameters together with subfossil Cladocera and diatoms community composition in surface sediments of 64 postglacial lakes NE Poland sampled along wide trophic gradient (from oligo- to highly eutrophic). The most important measured were chlorophyll-a, electrical conductivity (EC) oxygen concentration. In addition, total ...

This study involves a phytoplankton summer/autumn survey in 46 Virginia lakes and reservoirs during 2010-2012. A total of 307 taxa were identified which included several filamentous and colonial cyanabacteria in bloom concentrations.With the exception of one natural lake, the other sites sampled represent impoundments created decades ago, with the majority presently classified as mesoor eutroph...

Microcystis aeruginosa is a major primary producer and a common toxic cyanobacterium, playing an important role in the aquatic environment (Chen et al., 2016). Microcystis aeruginosa is commonly observed in highly eutrophic lakes (Watanabe and Oishi, 1985). In recent years, surface cyanobacterial bloom occurred frequently in most large shallow lakes in China, such as Lake Taihu (Zhang et al., 2...

A concentration of lindane (y-hexachlorocyclohexane) of 0.05 mg liter-‘, much lower than the 48-h lethal concentration (LC,,) of 3.8 mg liter-‘, resulted in a 25% depression in the frequency of movements of filtering limbs and mandibles of Daphnia pulex in a food-free medium. Different instars (from 2nd to 8th) were affected to the same extent. Animals 6-l 2 h after molting were more sensitive ...

Analyses of carbon stable isotopes are often used to estimate the contributions of allochthonous and autochthonous dietary resources to aquatic consumers. Most pelagic food web studies assume that all phytoplankton taxa have a similar δ13C value. We studied pelagic food web compartments (dissolved inorganic carbon [DIC], phytoplankton, bacteria, seston, cladoceran zooplankton) in 12 small (< 0....