Sökning: "Life-History Theory"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden Life-History Theory.

1. 1. Sexual selection in the collared flycatcher (Ficedula albicollis) : A life-history perspective

   Författare :Anna Qvarnström; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Sexual selection; life-history; honest signalling; fighting ability; genotype-environment interaction; direct benefits; indirect benefits; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

   Sammanfattning : This thesis integrates sexual selection theory with life history theory to elucidate the causes and consequences of variation in a male secondary sexual trait. The model organism, the collared flycatcher (Ficedula albicollis), was studied on Gotland, Sweden. LÄS MER

3. 2. Causes and consequences of life-history variation : The effects of parasites, glucocorticoids, and environmental conditions in the collared flycatcher (Ficedula albicollis)

   Författare :Kevin Fletcher; Lars Gustafsson; Anders Pape Moller; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Collard flycatcher; Haemosporidian blood parasite; glucocorticoid; life history;

   Sammanfattning : Life-history is the study of all the different stages of life that affect reproductive success and survival between the birth and death of an organism. The reproductive output of an organism is constrained by many things including time, resource, disease agents and environmental conditions. LÄS MER

4. 3. Experimental Evolution of Life-history : Testing the Evolutionary Theories of Ageing

   Författare :Hwei-yen Chen; Alexei Maklakov; Tracey Chapman; Uppsala universitet; []
   Nyckelord :senescence; ageing; longevity; mortality; experimental evolution; Caenorhabditis remanei; Biologi; Biology;

   Sammanfattning : Ageing reduces fitness, but how ageing evolves is still unclear. Evolutionary theory of ageing hinges on the fundamental principal that the force of natural selection declines with age. LÄS MER

5. 4. Thermal adaptation along a latitudinal gradient in damselflies

   Författare :Viktor Nilsson-Örtman; Frank Johansson; Karl Gotthard; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Growth rate; metabolic theory of ecology; universal temperature dependence; environmental gradients; thermal performance; thermal sensitivity; environmental variability; optimality theory; life history; acclimation; size structure; competition; cannibalism; intraguild predation;

   Sammanfattning : Understanding how temperature affects biological systems is a central question in ecology and evolutionary biology. Anthropogenic climate change adds urgency to this topic, as the demise or success of species under climate change is expected to depend on how temperature affects important aspects of organismal performance, such as growth, development, survival and reproduction. LÄS MER

7. 5. Att förstå drogmissbruk : Praktiken, situationen, processen

   Författare :Berit Andersson; Sociologiska institutionen; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; life history; context; drug abuse; multidimensional theory; sociology; process; practice; sociologi;

   Sammanfattning : While the purpuse of the study is to understand drug abuse through experiences told by individuals in life history interviews, the analyses moves beyond the level of descriptive life history. The interview material is interpreted within a theoretical framework, where the multidimensional character of drug abuse is considered. LÄS MER