International Journal of Limnology

Our paper developed and evaluated temperature-dependent embryo development modelsfor a group of cold, stenothermic fishes (Salmonidae Coregoninae) to assess the potential impacts of climate-induced changes in water temperature on cisco (Coregonus artedi) from two populations in Lake Superior (Apostle Islands [USA] and Thunder Bay [Canada]) and one in Lake Ontario (USA), vendace (C. albula) in Lake Southern Konnevesi (Finland), and European whitefish (C. lavaretus) in lakes Southern Konnevesi, Constance (Germany), Geneva (France), and Annecy (France). Water temperatures for each study group were simulated and changes in reproductive phenology across historic (1900-2006) and three future climatic-warming scenarios (2007-2099) were investigated. Models predicted that increases in water temperatures are likely to cause delayed spawning, shorter embryo incubation durations, and earlier larval hatching. Relative changes increased as warming scenarios increased in severity and were higher for littoral as compared to pelagic populations. Our simulations demonstrated that slower cooling in the autumn and (or) more rapid warming in spring can translate into substantial changes in the reproductive phenology of coregonines among our study groups. We expect that the changes in reproductive phenology predicted by our models, in the absence of thermal or behavioral adaptation, will have negative implications for population sustainability.

The long-term decline of the whitefish (Coregonus lavaretus) population in the boreal lake Pyhäjärvi, southwest Finland is described. Whitefish decline was associated with decreases in fecundity, winter survival of embryos, and larval density. The spawning stock was kept small by intensive fishery.

Due to the recorded preference for higher water temperature, dragonfly larvae preferred tufa barriers, while they were mostly absent from headwaters of mountainous streams. Favorable microhabitats were inorganic substrates associated with lower current velocity, in contrast to mosses associated with the strongest current. These results represent an important contribution to the knowledge of dragonfly ecology in karstic lotic habitats.

Our study introduces the first Bayesian Delay-Difference model adapted to whitefish fisheries in peri-alpine lakes. By analyzing various data, the model accurately estimates annual biomass, recruitment, stage structure of landings, and fishing mortality. These insights are invaluable for comprehending the historical trends and impacts of fishing activities on these stocks.

Our paper developed and evaluated temperature-dependent embryo development modelsfor a group of cold, stenothermic fishes (Salmonidae Coregoninae) to assess the potential impacts of climate-induced changes in water temperature on cisco (Coregonus artedi) from two populations in Lake Superior (Apostle Islands [USA] and Thunder Bay [Canada]) and one in Lake Ontario (USA), vendace (C. albula) in Lake Southern Konnevesi (Finland), and European whitefish (C. lavaretus) in lakes Southern Konnevesi, Constance (Germany), Geneva (France), and Annecy (France). Water temperatures for each study group were simulated and changes in reproductive phenology across historic (1900-2006) and three future climatic-warming scenarios (2007-2099) were investigated. Models predicted that increases in water temperatures are likely to cause delayed spawning, shorter embryo incubation durations, and earlier larval hatching. Relative changes increased as warming scenarios increased in severity and were higher for littoral as compared to pelagic populations. Our simulations demonstrated that slower cooling in the autumn and (or) more rapid warming in spring can translate into substantial changes in the reproductive phenology of coregonines among our study groups. We expect that the changes in reproductive phenology predicted by our models, in the absence of thermal or behavioral adaptation, will have negative implications for population sustainability.

The long-term decline of the whitefish (Coregonus lavaretus) population in the boreal lake Pyhäjärvi, southwest Finland is described. Whitefish decline was associated with decreases in fecundity, winter survival of embryos, and larval density. The spawning stock was kept small by intensive fishery.

Our study introduces the first Bayesian Delay-Difference model adapted to whitefish fisheries in peri-alpine lakes. By analyzing various data, the model accurately estimates annual biomass, recruitment, stage structure of landings, and fishing mortality. These insights are invaluable for comprehending the historical trends and impacts of fishing activities on these stocks.

Amphibians are major members of aquatic and terrestrial ecosystems. They serve as both predator and prey in both ecosystems. Therefore, they provide the transfer of energy between these systems. However, there are few studies on the gametogenesis of amphibian. Therefore, histological characteristics of Pelophylax bedriagae testes were studied.

In our study of the spawning behaviour of lake whitefish, we observed fish using a variety of habitat types during the spawning season, including a rocky spawning shoal, sandy substrates, and steeper slopes. Both sexes moved shallower at night and deeper during the day, with males moving more at night and females more during the day. This study could help inform stewardship efforts aimed at lake whitefish spawning habitat restoration and protection.

From the beginning of the 1980s, professional fishermen and recreational anglers, together with state services and researchers from INRA, developed an applied research program focusing on the improvement and optimisation of salmonid stocking in the Lakes Geneva and Bourget. The aim of thispaperis to retrospectively retrace the key stages of this program and its main impacts on society.

We exploredpotential drivers of larval coregoninedistributions in Lake Geneva, France and Lake Superior, USA. Depth and wind were important drivers in both lakes, date was important in Lake Geneva, and available preydensity was not important. Understanding the importance of these factors can help elucidate mechanisms regulating larval survival.

Due to the recorded preference for higher water temperature, dragonfly larvae preferred tufa barriers, while they were mostly absent from headwaters of mountainous streams. Favorable microhabitats were inorganic substrates associated with lower current velocity, in contrast to mosses associated with the strongest current. These results represent an important contribution to the knowledge of dragonfly ecology in karstic lotic habitats.