Search for dissertations about: "PARENTAL EFFORT"

Showing result 1 - 5 of 20 swedish dissertations containing the words PARENTAL EFFORT.

  2. 1. Costs and Tactics in the Evolution of Reproductive Effort

    Author : Ingemar Jönsson; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; capital breeding; Falco tinnunculus; body mass; DEE; reproductive effort; reproductive costs; income breeding; Animal ecology; Djurekologi;

    Abstract : This study focuses on various aspects of costs of reproduction and the evolution of energetic breeding tactics. It emphasizes the distinction between demographic costs of reproduction expressed already before current offspring have reached independence (prebreeding costs), and costs expressed only after offspring independence (postbreeding costs). READ MORE

  4. 2. Paternal care, filial cannibalism and sexual conflict in the sand goby, Pomatoschistus minutus

    Author : Maria Lissåker; Charlotta Kvarnemo; Ulrika Candolin; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; female choice; filial cannibalism; Gobiidae; parental care; Pomatoschistus minutus; sand goby; sexual conflict; sexual selection; Biology; Biologi;

    Abstract : Natural and sexual selection and sexual conflict are forces shaping the evolution of reproductive behaviour, while constrained by factors like environment, physiology and life-history trade-offs. Parental care is costly both in terms of time and energy. READ MORE

  5. 3. Man, murres and modern fisheries : A case study in the Baltic Sea

    Author : Martina Kadin; Henrik Österblom; Olof Olsson; Carl Folke; Morten Frederiksen; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Seabirds; ecosystem dynamics; fisheries; indicators; ecosystem services; Baltic Sea; common murre; common guillemot; Uria aalge; naturresurshushållning; Natural Resources Management;

    Abstract : Overfishing and climate change put increasing pressure on marine systems, with effects on commercially targeted fish and top predators dependent on these resources. To achieve sustainable resource use, governance mechanisms need to incorporate knowledge about ecosystem dynamics. READ MORE

  6. 4. Female choice and paternal care in the fifteen-spined stickleback, Spinachia spinachia

    Author : Sara Östlund-Nilsson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; fifteen-spined stickleback; spinachia spinachia; female choice; paternal care; nest building; ornament; fanning; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Animal Ecology; zooekologi;

    Abstract : In the fifteen-spined stickleback, Spinachia spinachia, males provide females with direct benefits by fanning, cleaning and guarding the offspring. Males announce their parental skills through intense body shakes during courtship. Females preferred to mate with more intensely shaking males. READ MORE

  7. 5. Physiological trade-offs in reproduction and condition dependence of a secondary sexual trait

    Author : Måns S. Andersson; Victor Apanius; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Trade-offs; life history; immune ecology; cost of reproduction; costs of immune response; sexual selection; migration; moult; Newcastle disease; HbA1C; Ficedula albicollis; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Animal Ecology; zooekologi;

    Abstract : This thesis examines parental condition, how it is traded off against reproduction and how it is displayed in a secondary sexual trait. The studies were performed on nest-box breeding collared flycatchers Ficedula albicollis on the island of Gotland, in the Baltic Sea. READ MORE