Search for dissertations about: "Sex ANIMAL free"

Showing result 1 - 5 of 78 swedish dissertations containing the words Sex ANIMAL free.

  1. 1. Ontogeny and Population Biology of a Sex-Limited Colour Polymorphism

    University dissertation from Xanto Grafiska AB

    Author : Jessica Abbott; Lund University.; Lunds universitet.; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; embryologi; ontogeni; animal morphology; embryology; Utvecklingsbiologi; Damselflies; Colour polymorphism; Development; Frequency-dependence; Morphology; growth animal ; ontogeny; Animal anatomy; Development biology; Djurs anatomi och morfologi; Population divergence; Animal ecology; Djurekologi;

    Abstract : This study has involved investigation of number of populations of the damselfly Ischnura elegans over several years, looking at frequency changes over time, morphological differences between the sexes and the morphs, differences in growth rate and development time, differences in fecundity between the morphs, and genetic differentiation between populations. I. READ MORE

  2. 2. Brood sex ratio and sex differences in Tengmalm’s owl (Aegolius funereus)

    University dissertation from Xanto Grafiska AB

    Author : Tim Hipkiss; Umeå universitet.; [2002]
    Keywords : Aegolius funereus; avian CHD1 genes; brood sex ratio; differential mortality; nomadism; northern Sweden; sexual size dimorphism; sibling rivalry; supplementary feeding; vole cycles; zooekologi; Animal Ecology;

    Abstract : Males and females differ in morphology and behaviour, so that selection acts differently on the two sexes. This changes the relative reproductive success of males and females, and it is beneficial for parents to bias the sex ratio of their broods in favour of the sex with the best survival and breeding prospects. READ MORE

  3. 3. Sex in Murky Waters Anthropogenic Disturbance of Sexual Selection in Pipefish

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Josefin Sundin; Uppsala universitet.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mating system; Mate choice; Courtship; Eutrophication; Turbidity; Hypoxia; Ocean acidification; Syngnathidae; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Abstract : Animals experience variation in their environment because of natural changes. However, due to anthropogenic disturbance, the speed and severity of these changes have recently increased. This thesis investigates how reproductive behaviours may be affected by human induced environmental change. READ MORE

  4. 4. Sex, Sperm and Speciation On sexual selection and fertility in hybridizing flycatchers

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Murielle Ålund née Podevin; Uppsala universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; sperm biology; sexual selection; speciation; hybridization; cryptic female choice; fertility; Ficedula flycatchers; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Abstract : Sexual reproduction entails complex co-evolution between the sexes, necessary for successful fertilization, ensuring individual and population-level fitness. Interfertility is the main criterion for species definition and understanding speciation requires detailed studies of reproductive barriers. READ MORE

  5. 5. Sex chromosomes in willows

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Pascal Pucholt; Sveriges lantbruksuniversitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Sexual reproduction is found in most eukaryotes and has in the majority of animal species led to the evolution of separate sexes. In contrast, only 5-6% of all angiospersms are dioecious with female and male flowers on separate individuals. Interestingly, dioecy has evolved hundreds of times independently and at different timepoints in angiosperms. READ MORE