Two amphipods, the hypogean Niphargus stygius and epigean Gammarus fossarum, were analyzed for fatty acid (FA) composition, electron transport system (ETS) activity and respiration (R) during a laboratory fasting experiment. In agreement with ETS and R measurements, the hypogean N. stygius utilized FA more slowly than the epigean G. fossarum. Inter-specific differences in the utilization of certain FA during fasting were also revealed. This is the first report, which connects ETS activity with changes in concentrations of specific FA during fasting.
An established population of the tropical redclaw crayfish Cherax quadricarinatus in Europe is reported for the first time. The redclaw population was found in 2009 in the natural river oxbow lake Topla with thermal hot water springs in eastern Slovenia. The species is known to be invasive in tropical and subtropical regions, but this is the first record from the temperate climate zone. According to the modelled limits considering annual water temperature fluctuations further expansion of the redclaw is expected inside the thermal oxbow lake, but invasion to adjacent rivers is less probable.