Search for dissertations about: "maternal investment"

Showing result 1 - 5 of 11 swedish dissertations containing the words maternal investment.

  2. 1. Evolutionary implications of acidification: a frog’s eye view

    Author : Katja Räsänen; Andrew Hendry; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; acid stress; amphibians; local adaptation; maternal effects; maternal investment; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Abstract : Understanding the diversity of life is one of the main aims of evolutionary biology, and requires knowledge of the occurrence and causes of adaptive genetic differentiation among geographically distinct populations. Environmental stress caused by acidity may cause strong directional selection in natural populations, but is little explored from an evolutionary perspective. READ MORE

  4. 2. Reproductive investment in Syngnathus typhle, the broad-nosed pipefish

    Author : Ines Goncalves; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Syngnathidae; sex-role reversal; paternal care; male quality; female choice; maternal effects; reproductive compensation; embryo development; brood reduction.;

    Abstract : Manuscripts: 1 - Reproductive compensation by broad-nosed pipefish females. 2 - Male size is a predictor of quality of parental care in the broad-nosed pipefish... READ MORE

  5. 3. Costs and benefits of immune system activation on physiology, behavior and offspring phenotype from an immunoecological perspective

    Author : Sandra Sköld Chiriac; Evolutionär ekologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; immunoecology; acute-phase response; sickness behaviors; energy expenditure; fever; hypothermia; life history; maternal effects; terminal investment; costs of immune responses; Taeniopygia guttata; Parus major; Cyanistes caeruleus;

    Abstract : Pathogen challenges and host immune defenses can have substantial impact on life history patterns of animals. Biotic and abiotic factors may affect immunity in wild animals, influencing e.g., population dynamics and sexual selection. READ MORE

  6. 4. Dynamics of the aphid-ant mutualism

    Author : Karolina Tegelaar; Olof Leimar; Judith Bronstein; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mutualism; transgenerational; aphids; aphid-ant; conflict of interest; E -β-farnesene; phenotypic plasticity; predation risk; wing induction; maternal effect; reproductive investment; embryo size; etologi; Ethology;

    Abstract : An appreciation of the role of mutualism is essential when studying ecology and evolution in most ecosystems. Information covering aspects of mutualistic interactions can serve as a complement to the somewhat one-sided perspective from the 1950’s and 60’s that is used when teaching biology. READ MORE

  7. 5. Maternal investment in male and female offspring in the fallow deer

    Author : Björn Birgersson; Kjell Wallin; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Animal physiology; Zoofysiologi; zoologi; Zoology;

    Abstract : In this thesis, I investigate whether mothers of the polygynous fallow deer, Dama dama, bias their investment towards male offspring. I aim to answer the specific questions: (i) how is offspring fitness related to maternal investment?; (ii) do male fawns grow faster than female fawns during the period of maternal investment, and if so, why?; (iii) are male fawns more costly to raise than female fawns?; (iv) do fallow deer mothers adjust the sex of their offspring in relation to their ability to invest resources? To answer these questions I have collected and analysed data on reproduction of an enclosed fallow deer population and also performed an experimental study in which the level of investment was controlled for. READ MORE