Search for dissertations about: "bird of prey"

Showing result 11 - 15 of 17 swedish dissertations containing the words bird of prey.

  2. 11. Migration strategies of raptors – spatio-temporal adaptations and constraints in travelling and foraging

    Author : Roine Strandberg; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; route convergence; loop migration; mortality; spatio-temporal distribution patterns; pre- and post-migratory movements; daily travel routines; satellite tracking; fly-and-forage migration; raptors;

    Abstract : My dissertation is about bird migration and addresses questions about how raptors adapt to the fluctuating environments during the transition seasons between breeding and wintering. The migration is highly affected by local prey abundance, foraging strategies, weather conditions and landscape patterns along the migration routes as well as navigation and orientation mechanisms and cues. READ MORE

  4. 12. Nest-site attendance and foraging ecology of the Northern Fulmar (Fulmarus glacialis) on the Faroe Islands. Is the Northern Fulmar a useful indicator of ecosystem productivity and pollution?

    Author : Johannis Danielsen; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nest-site attendance; foraging ecology; indicator species; Fulmar; Fulmarus glacialis; nocturnal activity; ecosystem productivity; pollution; mesopelagic fish;

    Abstract : The Northern Fulmar (Fulmarus glacialis) is one of the most abundant seabirds in the Northern Hemisphere and the most abundant seabird on the Faroe Islands. Except from a few sporadic observations up until the 1950´s no study has focused on this species on the Faroe Islands. READ MORE

  5. 13. Across landscapes and seascapes : The movement ecology of diving and flying guillemots and gulls during breeding

    Author : Thomas J. Evans; Evolutionär ekologi; []
    Keywords : Uria aalge; Larus fuscus; Laridae; animal flight; foraging ecology; movement ecology; seabirds;

    Abstract : Most seabirds breed colonially, at which time they make central-place foraging trips. Parents must collect food both for themselves and for egg production/chick-rearing. READ MORE

  6. 14. Colour patterns in warning displays

    Author : Marianne Aronsson; Gabriella Gamberale-Stille; Olof Leimar; Candy Rowe; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; aposematism; warning colouration; colour patterns; avoidance learning; generalization behaviour; signal design; signal evolution; conspicuousness; mimicry; etologi; Ethology;

    Abstract : In aposematism a prey species use bright colours, often combined with a black contrasting pattern, to signal unprofitability as prey to potential predators. Although there are several different hypotheses about the presence of these internally contrasting patterns, there is little experimental evidence of any beneficial effects. READ MORE

  7. 15. Bis(4-chlorophenyl) sulfone and PCB methyl sulfone metabolites : Trends and chirality in the Baltic Sea environment

    Author : Karin Norström; Åke Bergman; Mats Olsson; Roland Kallenborn; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; bis 4-chlorophenyl sulfone; PCB methyl sulfone; Baltic Sea; Environmental chemistry; Miljökemi;

    Abstract : The Baltic Sea was earlier identified as a highly polluted brackish water body and still is. The high concentrations of polychlorinated biphenyls (PCBs), p,p’-DDT and related compounds led to severe effects on several species in the Baltic region. READ MORE