In this study, we aimed to evaluate the effects of a short pulse exposure of the pyrethroid lambda-cyhalothrin (LC) on the predator and anti-predator behaviour of the same species; Gammarus pulex. Predator behaviour, at the level of the individual, was studied in indoor microcosms using video tracking equipment during simultaneous exposure of the predator (G. pulex) and its prey (Leuctra nigra)...

In this study, the oxidative stress effects of cadmium (Cd) toxicity depending on water temperature were investigated Gammarus pulex. The test organism individuals exposed to sublethal concentrations for 96 hours at certain rates (C1; 1/10, C2; 1/20 and C3; 1/40) LC50 values Cd each (10, 14, 18 °C). Malondialdehyde (MDA) level, glutathione peroxidase (GPx), catalase (CAT) enzyme activities temp...

Manipulative parasites often alter the phenotype of their hosts along multiple dimensions. 'Multidimensionality' in host manipulation could consist in the simultaneous alteration of several physiological pathways independently of one another, or proceed from the disruption of some key physiological parameter, followed by a cascade of effects. We compared multidimensionality in 'host manipulatio...

Polybrominated diphenyl ethers (PBDEs) are abundant in aquatic environment. However, only few studies have investigated their impacts on freshwater invertebrates. This work aimed to study the effects of BDE-47 and BDE-99 congeners on the chitobiase and chitinolytic enzymes activities of the freshwater amphipod Gammarus pulex, according to gender, PBDE concentration and time of exposure. In addi...

Aquatic risk assessment can be improved if we are able to quantitatively predict the effects resulting from sequential pulsed exposure to multiple compounds. We evaluate two modeling approaches, both extended to suit multiple compounds, the semi-mechanistic threshold damage model (TDM), and a model based on time-weighted averages (TWA). The TDM predicts that recovery of damage to Gammarus pulex...

Phylogenetically unrelated parasites often increase the chances of their transmission by inducing similar phenotypic changes in their hosts. However, it is not known whether these convergent strategies rely on the same biochemical precursors. In this paper, we explored such aspects by studying two gammarid species (Gammarus insensibilis and Gammarus pulex; Crustacea: Amphipoda: Gammaridae) serv...

Population structure, reproductive parameters and other life history traits are among the main preconditions for alien amphipods’ successful invasion. In freshwaters of Northern Europe, i.e. Latvia, overall Ponto-Caspian amphipods is little known. Furthermore, population structure reproductivity native Gammarus pulex have not been studied in Latvian freshwaters. The aim study was to describe va...