Climate effects on sympatric trout and char
The purpose of the current to study is to investigate the cardiorespiratory ability of Arctic char and brown trout to respond to environmental warming. These species are competing from the same habitats both in Northern Norway and in Eastern Finland. Environmental warming could influence on this competition and the availability of suitable habitats for both species i.e. distribution of species could change due to climate change. Furthermore, as the migration occurs in warmest time of the year, climate change might have detrimental effects on fish stocks . This,
on the other hand, will have significant influence on fishery and, as these species are top predators of lakes, on the whole ecosystem of lake. In the current study we will investigate the cardiac function (which has significant influence on swimming capacity, relates to in different temperatures and how these fish can tolerate environmental warming. With these measurements we are able to estimate the optimum and upper critical temperatures of both species. These measurements are done both from migrating and resident fish. Furthermore,
In a parallell project the research team of Associate Professors Torstein Kristensen (Nord University) and Jan Davidsen (NTNU) have conducted tagging of fish with acoustic telemetry tags i.e. the location and depth (water temperature and oxygen level) can be followed and related to physiological findings. Besides the physiological and ecological analyses the molecular level differences between species are going to be analysed and related to
physiological and ecological differences.The animals used in the experiment will be collected in their natural habitat at sea and in freshwater (total N is 48, 12 of each species from each environment). The experimantal procedure will be performed while animals are fully anesthezised, and the will be euthanized at the end of the experiments. The refinment of methods entails a less invasive and less animal-consuming approach compared with respirometry or growth experiments. Replacement of fish is not a viable option when looking at whole body
systemic responses.
on the other hand, will have significant influence on fishery and, as these species are top predators of lakes, on the whole ecosystem of lake. In the current study we will investigate the cardiac function (which has significant influence on swimming capacity, relates to in different temperatures and how these fish can tolerate environmental warming. With these measurements we are able to estimate the optimum and upper critical temperatures of both species. These measurements are done both from migrating and resident fish. Furthermore,
In a parallell project the research team of Associate Professors Torstein Kristensen (Nord University) and Jan Davidsen (NTNU) have conducted tagging of fish with acoustic telemetry tags i.e. the location and depth (water temperature and oxygen level) can be followed and related to physiological findings. Besides the physiological and ecological analyses the molecular level differences between species are going to be analysed and related to
physiological and ecological differences.The animals used in the experiment will be collected in their natural habitat at sea and in freshwater (total N is 48, 12 of each species from each environment). The experimantal procedure will be performed while animals are fully anesthezised, and the will be euthanized at the end of the experiments. The refinment of methods entails a less invasive and less animal-consuming approach compared with respirometry or growth experiments. Replacement of fish is not a viable option when looking at whole body
systemic responses.