Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"delayed dispersal"”.
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Cooperative breeding and delayed dispersal in the Pale chanting goshawk, Melierax canorus
… individuals in the population to delay dispersal and become non-breeding or co-breeding members of Pale Chanting Goshawk families, and to determine why cobreeders breed cooperatively in polyandrous trios. In all vegetation types within the study area, non-breeders, as juvenile and adult …
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Intrabrood Dominance Hierarchies in Juvenile Red-Cockaded Woodpeckers: The Role of Early Social Environment On Post-Fledging Survival and Natal Dispersal
… environment prior to fledging influenced male dispersal decisions and subordinates delayed dispersal in the spring in situations where all dominants died over the winter. The probability of delayed dispersal in females was higher for females raised without brood-mates in one of two populations …
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Factors Affecting Natal Dispersal by Song Wrens (Cyphorhinus Phaeocephalus): Ecological Constraints and Demography
… tropical birds. Second, I documented patterns of delayed dispersal of Song Wren offspring. Song Wren males typically delay dispersal much longer than do females. Two hypotheses proposed to explain the evolution of delayed dispersal in birds were tested using data from both naturally-occurring and …
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The pre-reproductive period in a tropical bird: parental care, dispersal, survival, and avian life histories
… is essential for studies of parental care, dispersal, demography, and life histories. Studies of the pre-reproductive period are particularly few in tropical regions, where the organization of life histories are predicted to differ compared to northern hemisphere species. For my dissertation …
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Life-history evolution and cooperative breeding in the sociable weaver
… or other constraints, while still showing delayed dispersal and cooperative breeding. This study investigates what factors drive life-history evolution in a cooperatively breeding southern African passerine, the sociable weaver Philetairus socius. This species departs from the traditional …
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The Dynamics of Cavity Excavation and Use by the Red-Cockaded Woodpecker (Picoides Borealis)
… constraints model for the evolution of delayed dispersal in the cooperatively breeding red-cockaded woodpecker. The long times required for cavity excavation select for competition over breeding vacancies in established territories and against excavation of cavities in unoccupied …
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Group living features can challenge predictions for the evolution of altruistic behaviors
… In the first model, I study the evolution of delayed dispersal with group size benefits. Dispersal tends to be delayed when breeding opportunities are scarce, i.e., when the habitat is saturated. I find that habitat saturation is not always associated with a high level of dispersal. This …
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Sociality in the common mole-rat, Cryptomys hottentotus hottentotus : the effects of aridity
… foraging risks and consequently the costs of dispersal? and (2) do these inter-habitat differences have implications for bathyergid social evolution i.e. do the common mole-rat populations inhabiting arid and mesic areas exhibit regional differentiation in social behaviour? Substantial …
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Behavior and Ecology of Wild Slow Lorises (Nycticebus coucang): Social Organization, Infant Care System, and Diet
… with relatively small testis volume and natal dispersal occuring in both sexes, hints towards a monogamous mating system. In one case an extended family group formed by delayed dispersal of a primary pair's offspring. Friendly interactions among group members included allogrooming, following, …
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Sociality in African mole-rats : exploring how rainfall affects dispersal and genetic exchange in the Natal mole-rat (Cryptomys hottentotus natalensis)
… that higher rainfall would provide more dispersal opportunities and higher immigration rates. Population level FST values indicated the presence of male-biased dispersal. Relatedly, females were more related to females in neighbouring family groups than males. The study site had three …