25 uppsatser · sida 1 av 2
: effekter på habitatkvalitet och populationstätheter av juvenil öringar (Salmo trutta L.)
… on population density of stream dwelling fish in relation to the changes in habitat, I studied the physical habitat restored and channalized sites and their population density of brown trout (Salmo trutta L.) in three streams in the municipality of Sorsele. The differences …
… and temporally can have a large impact on populations. When the range and habitat areas of a species continuously decrease, management strategies are often needed if the species shall be able to survive. Management strategies have been formulated for the beetle Apalus …
kvaliteten på urbana habitat och om beståndstäthet är ett bra mått på habitatkvalitet
… studied during the last decade, and comparisons between urban and non-urban habitats have been carried out. A common method for measuring habitat quality is to calculate the population density. This method is easy to use, but have been criticized during the last couple of years …
a case study of moose in northern Sweden
… indirect causes. Hence it becomes vital to study the migration phase and the habitat and resources selected during migration. The objective with this study was to identify the habitat characteristics and resource selection of moose during migration and compare the selection …
En studie av skillnaderna i odlingslandskapets konnektivitet med avseende på två skyddsvärda arter med olika preferenser
… and communicating the relationships between species dispersion and access to habitat. In this study the following question is posed: How is the Osmoderma eremita and the Pernis apivorus dispersal possibilities in the small scale cultivated landscape of Borås affected by …
betydelsen av igenväxningsgrad och tid sedan igenväxning började
… have remarkably high plant species diversity. In Sweden this type of habitat has declined for the last two centuries. Changed land use has caused habitat fragmentation and loss of habitat quality. This has caused a great number of plant species to end up on the verge of …
… studied during the last decade, and comparisons between urban and non-urban habitats have been carried out. A common method for measuring habitat quality is to calculate the population density. This method is easy to use, but have been criticized during the last couple of years …
… for bio-diversity, conservation needs good analyses and planning tools. Habitat models combined with geographic information systems can be used to study the spatial structure of suitable habitat. The Lesser spotted woodpecker (Dendrocopos minor) has been proposed as an indicator …
behavioural responses to habitat fragmentation
The loss of habitat is one of the greatest threats to global biodiversity today. Consequences to a species inhabiting fragmented habitats include: group size changes, altered diets and altered foraging behaviours. In my study I observed Colobus anlgolensis palliatus troops …
… bomas. The aim of this study was to investigate how active bomas influence the habitat choice of warthogs. The study was carried out in the Maasai Mara National Reserve and the adjoining Koyake group ranch, in august 2003 and May-June 2004, using well defined study areas …
… bottom substrate and deterioration in water quality. In this study, habitat preferences of Unio crassus were investigated to assist in future restoration work. The environmental parameters that were used to characterize the habitat in sites with or without Unio crassus were …
att skapa ett hållbart fiske med hög kvalitet
… to look like it did before the rafting, and one has posted stone to create habitat for the fish and restore the river to what it looked like before the rafting period. Some of Ammeråns tributaries that was cleared for rafting has been restored and spawning areas has been made …
… was to investigate if the voluntary retentions corresponded with possible habitats of rare and endangered species and to estimate the forest owners? losses of income, due to the voluntary retentions that are made at the forest property. The objective was also to increase …
förekomst, substratkrav och effekter av skogsbrukets naturvårdsåtgärder
… if the right methods are used. The aim of the study was to study the biology, habitat associations and distribution pattern of the species to be able to evaluate the conservation strategies. The study took place in a 200 km2 area in northern Hälsingland, north central Sweden …
… and reduction of forest area is a threat for many forest species and their habitat. Deficiencies in forest quality, such as lack of dead wood and old trees, are one explanation of the threat. The most important action to prevent the continued loss of forest types is to protect …
