Search for dissertations about: "Migration strategy"

Showing result 1 - 5 of 95 swedish dissertations containing the words Migration strategy.

2. 1. Ecology and evolution of large-scale bird migration patterns : A natural history and comparative study of the migration in common and little ringed plovers

   Author : Linus Hedh; Evolutionär ekologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; ringed plover; leap-frog migration; migration speed; migration process; light level geolocator; migration;

   Abstract : Migration distance and seasonal redistribution patterns may vary between and within bird populations. A common pattern is leap-frog migration, in which northerly breeding populations migrate farther and winter south of more southerly breeding populations. READ MORE

4. 2. Adaptive flexibility in migratory behaviour of shorebirds

   Author : Johanna Grönroos; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bird migration; compensation; departure decision; flight distance; migration speed; migration strategy; orientation; shorebird; stopover; wind drift; wind selectivity;

   Abstract : The phenomenon of bird migration has long fascinated us humans and it has prompted questions like where do they go or come from and how do they find their way? Arctic shorebirds are well known for their spectacular long-distance migrations with some species travelling more than 10 000 km every spring and autumn, and some even cover this distance in one single nonstop flight. The aim of my thesis was to investigate the flexibility of Arctic shorebirds when it comes to orientation behaviour, departure behaviour and migration strategy. READ MORE

5. 3. Immigrants' income and family migration

   Author : Saman Rashid; Thomas Aronssson; Björn Gustafsson; Umeå universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Immigrant; wage earnings; labour participation; family income; family investments; intenal migration; immigrant women; family migration; Nationalekonomi; Economics; Nationalekonomi; nationalekonomi; Economics;

   Abstract : This thesis consists of three papers studying the economic situation of immigrants in Sweden in terms of wage earnings, labor participation and family internal migration. Paper [I] (http://www.econ.umu. READ MORE

6. 4. Strategy games; on survival and reproduction

   Author : Helen Olofsson; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ekologi; Ecology; evolution of sexual reproduction; dormancy; game theory; migration; bet-hedging; Life history theory;

   Abstract : Classical evolutionary life history concerns questions such as optimal timing of maturation, life span and number of offspring. These questions have mostly been studied theoretically under the assumption that the environment is stable and without taking into account frequency and density dependence. READ MORE

7. 5. The Problem of Partial Migration - the Case of the Blue Tit

   Author : Anna Nilsson; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Naturvetenskap; Natural science; Djurekologi; Animal ecology; Ekologi; Ecology; weather; personality; partial migration; metabolic rate; evolution of migration; dominance; Cyanistes caeruleus; climate change; blue tit; behavioural strategies; bird migration;

   Abstract : In the evolution of bird migration, partial migration is assumed to be an important intermediate step between migration and residency. Partial migration is characterised by the existence of both migratory and resident individuals in a given population. READ MORE