Sökning: "zoologisk ekologi"

Visar resultat 1 - 5 av 50 avhandlingar innehållade orden zoologisk ekologi.

  1. 1. Biology, ecology and anthropogenic threats of Indo-Pacific bottlenose dolphins in east Africa

    Författare :Omar A. Amir; Per Berggren; Graham Pierce; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Growth; reproduction; feeding ecology; bycatch; organohalogen compounds; dolphins; Tursiops aduncus; Zanzibar; East Africa; Marine ecology; Marin ekologi; zoologisk ekologi; Animal Ecology;

    Sammanfattning : This thesis examines the biology, ecology and anthropogenic threats of Indo-Pacific bottlenose dolphins (Tursiops aduncus) off Zanzibar, Tanzania, based on research conducted and samples collected between 2000 and 2008. Distribution and occurrence are described based on incidental catches (bycatch) in gillnet fisheries. LÄS MER

  2. 2. Offshore wind farms - ecological effects of noise and habitat alteration on fish

    Författare :Mathias H. Andersson; Sören Nylin; Magnus Wahlberg; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; renewable energy; fish population; artificial reef; attraction vs. production; habitat structure; reef effect; FAD; bioacoustics; noise disturbance; fish behaviour; detection range; threshold; masking; fish communication and hearing; Marine ecology; Marin ekologi; zoologisk ekologi; Animal Ecology;

    Sammanfattning : There are large gaps in our understanding how fish populations are affected by the anthropogenic noise and the alteration of habitat caused by the construction and operation of offshore wind farms. These issues are of great importance as the construction of offshore wind farms will increase all over the world in the near future. LÄS MER

  3. 3. Life at stake when playing hide and seek : Concealing effects of prey colouration and visual backgrounds

    Författare :Marina Dimitrova; Merilaita Sami; Innes C. Cuthill; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; predation; adaptive prey coloration; camouflage; concealment; crypsis; background matching; disruptive colouration; distractive markings; Terrestrial ecology; Terrestrisk ekologi; zoologisk ekologi; Animal Ecology;

    Sammanfattning : A prey animal can use different strategies to avoid becoming eaten by predators. One such widely recognised strategy is the use of body colouration to decrease the risk of becoming detected, i.e. cryptic colouration. LÄS MER

  4. 4. Phylogenetic perspective on host plant use, colonization and speciation in butterflies

    Författare :Elisabet Weingartner; Sören Nylin; Niklas Wahlberg; Felix Sperling; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Oscillation hypothesis; speciation; Polygonia; Celastrina; Pararge; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; zoologisk ekologi; Animal Ecology;

    Sammanfattning : In this thesis we have studied speciation in three butterfly genera Polygonia (Nymphalidae, Nymphalini), Pararge (Nymphalidae, Satyrinae) and Celastrina (Lycaenidae: Polyommatinae). In the first paper a dated phylogeny, based on molecular data, of Polygonia was constructed. We found strong conflict between the nDNA and mtDNA datasets. LÄS MER

  5. 5. Evolution of host repertoires and the diversification of butterflies

    Författare :Mariana Pires Braga; Niklas Janz; Sören Nylin; Fredrik Ronquist; Alexandre Antonelli; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; coevolution; host-parasite interaction; inference; networks; zoologisk ekologi; Animal Ecology;

    Sammanfattning : All herbivorous insects are specialized to some extent to their host plants, but the level of specialization varies greatly. Insect-plant coevolution is often invoked to explain the large diversity of herbivorous insects, but the role of specialization during diversification is still controversial. LÄS MER