Phytoplankton biodiversity in the Parambikulam-Aliyar irrigational canals (Latitude 10o15’and 10o30’ N and Longitude 76o50’ and 77o10’ E), Tamilnadu, South India were studied at five stations (S1-S5), Kulanaickenpatti canal (S1), Seelakkampatti canal (S2), Poosaripatti canal (S3), Kongalnagaram canal (S4) and Pethappampatti canal (S5). Totally 22 species of phytoplankton, of which 9 species of ...

The changes imposed by dams on hydrological regime, water transparence and nutrient concentrations downstream affect biodiversity in relation to species richness and specific composition of the community. The aim of this work was evaluate this effect on periphyton, comparing richness and composition of periphytic algae in the Garças Lake, Upper Paraná River floodplain, between the years 1994, b...

Carotenoids in eukaryotic phototrophic organisms can be classified into two groups; β-carotene and its derivatives, and α-carotene and its derivatives. We re-examined distribution of α-carotene and its derivatives among various taxa of aquatic algae (17 classes) and land plants. α-carotene and its derivatives were found from Rhodophyceae (macrophytic type), Cryptophyceae, Euglenophyceae, Chlora...

The amphipod Monoporeia a&is (LindstrGm) exhibits long-term population oscillations in oligotrophic Lake V&tern. Correlation showed profundal oxygen and temperature, and intraspecific and predatory interactions to be poor explanatory variables. Conversely, the interannual variability in food availability-diatom biovolumewas highly correlated with amphipod total density at t + 1 yr and the densi...