Intraspecific variation in the functional responses of an invasive tropical freshwater fish under increasing temperature regimes.

Global warming and the introduction of non-native fish represent major threats to freshwater biodiversity worldwide, but their effects have usually been investigated separately. Since most fish are ectotherms, their metabolism and feeding behaviour are highly influenced by temperature. Increasing water temperatures may thus exacerbate the impact of non-native fish, particularly those adapted to warmer conditions, on prey populations.

Individual diet variability shapes the architecture of Antarctic benthic food webs.

Antarctic biodiversity is affected by seasonal sea-ice dynamics driving basal resource availability. To (1) determine the role of intraspecific dietary variability in structuring benthic food webs sustaining Antarctic biodiversity, and (2) understand how food webs and the position of topologically central species vary with sea-ice cover, single benthic individuals' diets were studied by isotopic analysis before sea-ice breakup and afterwards. Isotopic trophospecies (or Isotopic Trophic Units) were investigated and food webs reconstructed using Bayesian Mixing Models.

Effects of Sea-Ice Persistence on the Diet of Adélie Penguin () Chicks and the Trophic Differences between Chicks and Adults in the Ross Sea, Antarctica.

In Antarctica, prey availability for the mesopredator Adélie penguin, , depends on sea-ice dynamics. By affecting cycles of sea-ice formation and melt, climate change could thus affect penguin diet and recruitment. In the light of climate change, this raises concerns about the fate of this dominant endemic species, which plays a key role in the Antarctic food web.

The Feeding Behaviour of Gall Midge Larvae and Its Implications for Biocontrol of the Giant Reed: Insights from Stable Isotope Analysis.

The gall midge , whose larval stage interferes with the reed's leaf development, is a potential candidate agent for the biological control of . Reed infestation is always associated with the presence of a saprophytic fungus, , which is believed to provide food for the larvae. Larvae also interact with a parasitic nematode, which can be considered its natural enemy.

Climate-related drivers of nutrient inputs and food web structure in shallow Arctic lake ecosystems.

In order to predict the effects of climate change on polar ecosystems, disentangling mechanisms of nutrient transfer in food webs is crucial. We investigated sources of nutrients in tundra lakes, tracing their transfer through the food web and relating the observed patterns to runoff, snow coverage, and the presence of migratory geese in lake catchments. C and N content (elemental and isotopic) of several food web components including Lepidurus arcticus (Notostraca, at the top of the lake food webs) in 18 shallow Arctic lakes was compared.