Field populations of aquatic organisms, particularly those inhabiting flowing waters, likely are exposed to short pulses of pesticides following periods of spray drift, surface runoff, or drain flow. In the present study, we investigated the effect of pulse exposures of a pyrethroid insecticide, esfenvalerate, on survival, development, and reproduction of the midge, Chironomus riparius. The fir...

Abstract Cigarettes are the most littered item in public spaces. Smokers who litter leaving a trace of toxic waste that adds to global plastic pollution due harmful chemicals and semisynthetic microfibres compose cigarette filters. Here we present multidisciplinary study aiming assess i) predictors littering, ii) toxicity filters freshwater invertebrate Chironomus riparius , including iii) pote...

The effects of fenitrothion exposure on fourth-instar Chimnomus riparius larvae were investigated on biochemical, physiological, and population-level parameters. Biochemical effects were investigated through measurements of acetylcholinesterase and cytosolic superoxide dismutase activities. Water content and dry weight of the larvae were used as physiological parameters, and the emergence rate ...

Studies were conducted to determine the effects of a panel of seven nanomaterials (NMs), namely: α-alumina, γ-alumina, precipitated silica; silica fume, calcined silica fume, colloidal antimony pentoxide (Sb(2)O(5)), and superfine amorphous ferric oxide (Fe(2)O(3)), on sediment dwelling invertebrates Chironomus tentans under controlled laboratory conditions. Percentage survival, enzyme activiti...

We propose a biologically based approach to analyze reproductive data for the midge (Chironomus riparius). We showed in a previous study that its larval development can be divided in two distinct phases regarding the use of energy: The somatic growth period and the gametic growth period. We hypothesize here the gametic period to be a crucial period for the energetic investment for reproduction....

The larvae of the genus Chironomus are a common object for hydrobiological studies, as well model cytogenetics. Morphologically, species very similar. One these or complex is “annularius”, which has Holarctic distribution. It chromosomal banding sequences characteristic Nearctic and Palearctic populations. Using an integrated method that included morphology, cytogenetics, molecular genetics, we...

Some evidence concerning the influence of various ions upon the fluxes and net uptake of sodium by the aquatic larva of Aides aegypti was described in an earlier paper (Stobbart, 1965). One of the main findings was that chloride in the external medium has, in concentrations up to 5 mM/1., a marked stimulatory effect upon sodium influx and net uptake. While the sodium pump (which occurs mainly i...