A study was made of the nutrition different-sized sockeye salmon underyearlings during littoral feeding period in summer-autumn 1972 on lake and river habitats. Diet 2and 3-year-old individuals sampled pelagic zone analyzed also. It found, that permanent dominating component diet age groups 0+, 1+ 2+ juvenile zones Kurile Lake plankton crustacean Cyclops scutifer : up to 1700 per one stomach, m...

Chironomid substrate-specific associations regarding the nature (organic-inorganic) and stability (stable-unstable) of different habitats were investigated at two low order Patagonian streams, during high and low water periods. Nant y Fall and Glyn rivers were visited twice (October 2007 and March 2008) and seven different habitat types were identified. A total of 60 samples were collected usin...

Vibrio cholerae, is the causative agent of cholera, that infects millions, annually. Chironomids are aquatic insects host V. cholerae. Toxigenic strains produce cholera toxin (CT) which main virulence factor causes symptoms. In contrast to other bacterial pathogens, cholerae produces CT when at low cell densities while hemagglutinin/protease (HAP) a high density-controlled gene. When behavior w...

In the study of chironomids in Armenia several species of Orthocladiinae subfamily of Cricotopus genus, Diamesinae subfamily of Diamesa genus, and Chironominae subfamily of Chironomus genus, have been identified. In the Cricotopus genus two sibling species were found, not distinguishable by larval morphological features, but clearly distinct cytogenetically. Keywords—Armenia, Chironomidae, kary...

Inflow of matter and organisms may strongly affect the local density and diversity of organisms. This effect is particularly evident on shores where organisms with aquatic larval stages enter the terrestrial food web. The identities of such trophic links are not easily estimated as spiders, a dominant group of shoreline predator, have external digestion. We compared trophic links and the prey d...

Abstract Chironomids are a useful group for investigating body size responses to warming due their high local abundance and sensitivity environmental change. We collected specimens of six species chironomids every 2 weeks over 2-year period (2017–2018) from mesocosm experiments using five ponds at ambient temperature 4°C higher than temperature. investigated (1) wing length within between sexes...

this research summarizes the data on benthic macro invertebrates collected from 25 points in the urmia lake wetlands during november 2008 to february 2009. the purpose of the study was to assess the effects of elevated salinity and nutrient (nitrogen and phosphorus) levels on macro invertebrate abundance and composition. a total of 32 taxa were collected, and the common taxa, including chirono...

African clawed frogs (Xenopus laevis) in a South Wales pond ate a wide variety and size range of prey. Zoobenthos and zooplankton made the greatest contribution to diets, both numerically and by weight. Terrestrial invertebrates made up a small proportion of the diet numerically but a large proportion of the diet mass during the spring and summer. Nektonic prey were present throughout the year ...