Search for dissertations about: "geese"

Showing result 1 - 5 of 10 swedish dissertations containing the word geese.

  2. 1. Flight strategies in migrating birds: when and how to fly

    Author : Martin Green; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; geese; waders; terns; Animal ecology; Djurekologi; wind tunnel; radio telemetry; satellite telemetry; radar; formation flight; flight speed adjustment; wind drift; energy savings; departure decisions; bird migration; wind;

    Abstract : Wind has a profound influence on migrating birds since it inevitably will influence travel time and energy expenditure. In this thesis I investigate how migrating birds are affected by, and use winds. READ MORE

  4. 2. Push and pull strategies : behaviour of geese in relation to scaring and set-aside fields

    Author : Malin Teräväinen; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Geese have been increasing in numbers in Europe during the last decades. They forage in agricultural landscapes and may cause damage to sensitive crops. Scaring and set-aside fields are two commonly used methods to alleviate damage by “pushing” geese from sensitive fields and “pulling” them to areas where they don’t cause damage. READ MORE

  5. 3. Nesting and migration in the introduced Canada goose in Sweden

    Author : Göran Sjöberg; Catherine M. Lessells; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Species introductions; DNA fingerprinting; natal dispersal; breeding dispersal; bird migration; wintering areas; clutch size; laying date; body reserves; nest defence; waterfowl; Canada goose; Anatidae; Branta canadensis;

    Abstract : The aim of the thesis was to document patterns in breeding and migration in Swedish Canada geese Branta canadensis, to explain these against the genetic and historical background of the population, and to test predictions of hypotheses pertaining to parental investment.The Canada goose population in Sweden was founded by the introduction of a few individuals in the 1930's. READ MORE

  6. 4. Life history decisions in a changing environment : A long-term study of a temperate barnacle goose population

    Author : Henk van der Jeugd; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Age at first reproduction; Barnacle goose; Branta leucopsis; Coloniality; Dispersal; Life-history; Mate choice; Population dynamics; Survival; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Animal Ecology; zooekologi;

    Abstract : This thesis shows that climate and increasing population density have profound effects on survival, age at first reproduction, and natal dispersal in a rapidly increasing temperate barnacle goose Branta leucopsis population on Gotland, Sweden.Colony size was found to be the most important fitness-determinant because of strong density-dependent effects on reproduction. READ MORE

  7. 5. Large grazing birds and crop damage : investigating spatial and temporal patterns to guide management practices

    Author : Teresa Montras Janer; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Populations of geese, swans and cranes (i.e., large grazing birds) are increasing in Europe and North America, raising conflicts between conservation and farming interests when, foraging in agricultural fields (often in the vicinity of wetlands), cause yield loss for farmers. READ MORE