Search for dissertations about: "Life-history approach"

Showing result 1 - 5 of 43 swedish dissertations containing the words Life-history approach.

2. 1. Reproduction and moult in pied and collared flycatchers (Ficedula hypoleuca and F. albicollis) : A life-history approach

   Author : Christer Hemborg; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Breeding time; Costs of reproduction; Long-distance migrant; Moult-breeding overlap; Sexual conflict; Survival probability; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

   Abstract : This thesis examines the trade-offs between investments in reproduction and self-maintenance (moult) in pied and collared flycatchers (Ficedula hypoleuca and F. albicollis). These two long-distance migratory passerine bird species were studied on the breeding grounds in Fennoscandia and in England. READ MORE

4. 2. Condition-dependence in life history evolution

   Author : Foteini Spagopoulou; Alexei Maklakov; Lars Gustafsson; Russell Bonduriansky; Pat Monaghan; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ageing; senescence; nongenetic inheritance; sex differences; condition-dependence; life history; trade-off; Ficedula albicollis; Caenorhabditis remanei; Telostylinus angusticollis; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

   Abstract : Ageing is the progressive physiological deterioration that appears with increasing age and eventually leads to a decline in survival and reproduction. This physiological process is omnipresent across the tree of life, but the expected trajectory can widely vary between and within species. READ MORE

5. 3. Behavioural, physiological and morphological correlates of life-history in killifishes − a macroevolutionary approach

   Author : Simon Eckerström-Liedholm; Alejandro Gonzalez Voyer; Björn Rogell; Alastair Wilson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; brain size evolution; comparative analysis; life-history continuum; risk-taking behaviour; sexual selection; trade-offs; etologi; Ethology;

   Abstract : Life-histories commonly evolve along a continuum from short-lived and fecund, to long-lived and less fecund. Because life-history traits are mostly components of reproduction and survival, understanding the causes and consequences of life-history variation is at the core of evolutionary biology. READ MORE

6. 4. Telomeres in ecology and evolution: Hypotheses and connections between telomere length, infections and life history trade-offs

   Author : David Gomez Blanco; MEMEG; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; telomeres; life history; telomere elongation; telomere shortening; early-life telomere length; critical threshold; malaria infection; great reed warbler; Acrocephalus arundinaceus;

   Abstract : Studying life history strategies is crucial for understanding the diversity among organisms. The trade-offs in traits related to survival, self-maintenance and reproduction play an important role in the variation of life histories and can be adjusted in response to environmental and physiological factors. READ MORE

7. 5. Psychotropic Pharmaceuticals in Aquatic Systems: An Ecological Perspective

   Author : Melanie Hedgespeth; Enhet akvatisk ekologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; ecotoxicology; aquatic; trophic level; pharmaceutical; SSRI; beta-blocker; sertraline; fluoxetine; propranolol; fish; daphnia; snail; predator; prey; behavior; life history; multiple stressor;

   Abstract : Psychotropic pharmaceuticals have been shown to exert a variety of sublethal effects on non-target organisms, even at low concentrations found in the environment (ng/L to µg/L); hence, the aim of my research has been to determine the individual-level effects of psychotropic pharmaceuticals (the selective serotonin reuptake inhibitors sertraline and fluoxetine, and the β-blocker propranolol) on behavioral and life history traits in freshwater organisms. Further, this research was directed towards assessing the potential large-scale impacts of these effects on population growth and predator-prey interactions (with community-level implications) via the application of traditional, ecological concepts and models. READ MORE