Sökning: "males"

Visar resultat 41 - 45 av 918 avhandlingar innehållade ordet males.

1. 41. Resources, the environment, and sex : Examining variation in sexually selected traits in a livebearing fish

   Författare :Erika Fernlund Isaksson; John Fitzpatrick; Gil G. Rosenthal; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; mate choice; sexual selection; competition; resource restriction; condition dependence; etologi; Ethology;

   Sammanfattning : Striking variation is observed in sexually selected traits. These traits influence the outcome of competition and choice before and after mating. Before mating, animals compete for the access to mating partners and choose who to mate with between several potential mates. LÄS MER

3. 42. Sexual conflict and male-female coevolution in the fruit fly

   Författare :Urban Friberg; Göran Arnqvist; Daniel Promislow; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cryptic male mate choice; Drosophila melanogaster; female mate choice; multiple mating; sexual conflict; sexually antagonistic coevolution; sexual selection; speciation; sperm competition; Biology; Biologi;

   Sammanfattning : Harmony and cooperation was for long believed to dominate sexual interactions. This view slowly started to change 25 years ago and is today replaced with a view where males and females act based on what is best from a costs-benefits perspective. LÄS MER

4. 43. Mortality in schizophrenia and affective disorder

   Författare :Urban Ösby; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Schizophrenia; Bipolar disorder; Unipolar disorder; Schizophrenia Incidence; Standardized Mortality Ratio; Schizophrenia Mortality; Bipolar disorder Mortality; Unipolar disorder Mortality; Schizophrenia Suicide; Bipolar disorder Suicide; Unipolar disorder Suicide. Medical Record Linkage; Patient admission; Epidemiology; Registries;

   Sammanfattning : Patients with psychiatric disorders such as schizophrenia, bipolar disorder and unipolar disorder have a considerably increased mortality compared to the population. To reduce this increased mortality is a major task for clinical psychiatry, and the aim of this study is to improve the knowledge about the increased mortality in order to reduce its effects for the patients. LÄS MER

5. 44. Genetic Structuring and the Evolution of Lekking Behaviour in the White-bearded Manakin, Manacus manacus

   Författare :Lisa Shorey; David McDonald; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Lek Evolution; Manacus manacus; White-bearded Manakin; Genetic Relatedness; Mating Success; Male Characteristics; Behaviour; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

   Sammanfattning : Genetic structuring is common in natural populations. It is important to identify and consider population structure when studying evolutionary processes. Recently, the discovery of genetic structuring in some lekking bird species has opened up new perspectives on our understanding of the evolution of lek mating systems. LÄS MER

7. 45. 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