Sökning: "parental conflict"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden parental conflict.

1. 1. Egg size evolution and paternal care in pipefishes

   Författare :Inês Braga Gonçalves; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Egg size; embryo development; embryo survival; hypoxia; male quality; mate choice; mating constraints; oxygen; parental care; parental effects; paternal care; reproductive compensation; sex-role reversal; sexual conflict; Syngnathidae; Syngnathus typhle;

   Sammanfattning : In this thesis I explore how sexual selection, sexual conflicts, coevolution with parental care and an environmental selective agent (hypoxia) affect the evolution of different egg characteristics and embryo survival and size in pipefishes (Syngnathidae). In the broad-nosed pipefish, Syngnathus typhle Linnaeus, both sexes prefer to mate with large partners; large females produce more and larger eggs and large males can care for more young, and, as shown in this thesis, invest more per embryo and provide better oxygenation during brooding. LÄS MER

3. 2. Breaking down break-ups : Studies on the heterogeneity in (adult) children’s outcomes following a parental separation

   Författare :Eva-Lisa Palmtag; Michael Gähler; Juho Härkönen; Karin Halldén; Matthijs Kalmijn; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Divorce; intergenerational contact; inter-parental conflict; joint physical custody; non-resident parent; parent-child conflict; parent-child relationship; separation; shared residence; Swedish Level of Living Survey LNU ; Sociology; sociologi;

   Sammanfattning : This thesis comprises three studies investigating heterogeneity in children’s outcomes post parental separation. The studies analyse diversity in outcomes after parental separation, applying both a retrospective long-term approach and a child perspective. LÄS MER

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

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

   Sammanfattning : 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. LÄS MER

5. 4. Sexual conflict and selection on pistil and pollen traits

   Författare :Josefin Madjidian; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Antagonistic trait; Collinsia heterophylla; delayed stigma receptivity; direct cost; first-donor advantage; gender bias; heritability; indirect benefit; mate choice; mixed-mating system; paternal diversity; pollen competition; pollen deposition; pollen load size; pollen tube growth rate; self-compatibility; semantics; sexual conflict; sexual selection; sexually antagonistic co-evolution;

   Sammanfattning : The incidence of sexual selection in plants is today acknowledged, however, just as in animals, evolution and maintenance of mate choice is gravely underexplored. Moreover, the potential for sexual conflicts to occur in plants has only been assessed empirically to a very limited degree. LÄS MER

7. 5. Female reproductive strategies and sexual conflicts in a polygynous mating system

   Författare :Maria Sandell; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; female aggression; nestling feeding; intraspecific brood parasitism; mating system; parental investment; sexual conflict; intrasexual competition; Animal ecology; Djurekologi;

   Sammanfattning : In this thesis, I have investigated conflicts of interest in the facultatively polygynous European starling (Sturnus vulgaris) with a focus on female reproductive strategies. The extent to which males provided parental care was a key issue in understanding the mating system of the starling. LÄS MER