Sökning: "Spawning habitat"
Visar resultat 11 - 15 av 43 uppsatser innehållade orden Spawning habitat.
11. Restaureringens effekt på öringpopulationen
Kandidat-uppsats, SLU/Dept. of Forest Ecology and ManagementSammanfattning : Until the 1970s, rivers in Sweden were used for timber floating. In order for the floating to be as efficient as possible, with a minimum of timber getting stuck, many rivers were cleared. Large rocks and boulders were removed from the main channel and tributaries, backwaters and shallow areas were secluded. LÄS MER
12. Stream size determines densities of larger juvenile brown trout in mountain streams
Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : The productivity or availability of juvenile habitats have theoretically been shown to determine size distributions of adult individuals and population abundance. Brown trout (Salmo trutta) is a species where adults may inhabit lakes and use connected streams for spawning and as nursery habitats for juveniles. LÄS MER
13. Future management of Laisriver Brown trout : what life history and enhancement strategy should be prioritized?
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : The life history and coexistence of subpopulations of brown trout in the same drainage area are relatively well known. The three forms of trout; sea-run, lake-run and resident, can all be present in the same location at some period of their life cycle, e.g. during the parr stage or at spawning. LÄS MER
14. Habitat availability and ontogenetic niche shifts : The effects on adult size of lake-living brown trout (Salmo trutta)
Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskapSammanfattning : One common consequence of ontogenetic niche shifts is that juveniles and adults of the same species often use different resources and habitats. Theory suggests that variation in productivity and/or habitat size for the respective life stage regulates size distribution of individuals and population biomass. LÄS MER
15. Återetablering av öring (Salmo trutta L.) med romutsättning : hur effektiv är metoden?
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : Många vattendrag har påverkats negativt av människan, vilket medfört förändrade förutsättningar för de arter som lever i dessa miljöer. Arter som öring (Salmo trutta) är beroende av biotoper med lämpliga ståndplatser, lekbottnar samt uppväxtområden, dessa habitat har reducerats drastiskt vid exploatering av vattendragen. LÄS MER
