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 20 of 94 for “"non-breeding"”.
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Ecology Of Non-Breeding And Breeding Crested Caracaras (Caracara cheriway) In Florida
… "caracara") is likely declining due to loss of breeding habitat. Consequently, management-oriented restrictions on landscape modification are applied where breeding occurs, but management rarely is extended beyond breeding areas. Focusing management on breeding areas can be effective if all …
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The gonadotropin-releasing hormone (GnRH) system: a comparison between breeding and non-breeding naked mole rats (Heterocephalus glaber)
… state as they do not ovulate or display breeding behaviours. They are, however, not infertile, and are capable of rising to the breeding position. Since GnRH is the "master hormone" of reproduction, this study investigates its role in the socially-induced suppression of reproduction in …
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African penguin (Spheniscus demersus) distribution during the non-breeding season : preparation for, and recovery from, a moulting fast
… of the endangered African penguin during the non-breeding season. As foraging success during this period is critical to adult survival, this project explores their dispersal patterns, as well as the degree of overlap with commercial purse-seine fisheries which target the same prey. African …
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Nesting Success of Dickcissel (Spiza americana) and Non-breeding Grassland Bird Use of Northwest Arkansas’ Remnant and Restored Tallgrass Prairies
… acreage for prairie avifauna, and while some breeding grassland species are present at these sites, nesting success and non-breeding use are still largely unknown. Both life history aspects are required for effective grassland bird conservation. My first objective was to access nest success of …
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Migration and moult strategy of the curlew sandpiper
… relation to the different migratory routes and non-breeding areas of the species, focusing on the carry-over effects which conditions at the breeding grounds have on the timing of post-breeding migration and, subsequently, on the timing of moult at the non-breeding areas. Part of the study also …
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Social suppression of reproduction in the naked mole-rat, Heterocephalus glaber : -Plasma LH concentrations and differential pituitary responsiveness to exogenous GnRH
… active soon after removal from the colony. The breeding female controls reproductive suppression in the non-breeding animals, and both males and females are sensitive to her presence and reproductive state. The breeding female is thought to maintain reproductive suppression in the non-breeding …
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The movement and landscape use of Blue Cranes in the Western Cape
… and distance travelled throughout the day of breeding and non-breeding cranes to determine whether the breeding status/season influences their ranging behaviour. There was no significant difference of the home range size between breeding cranes and non-breeding cranes (p > 0.05). There was …
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Rapid social regulation of 3β-HSD activity in the songbird brain
… with short-term aggressive challenges in many breeding vertebrates. However, some animals such as song sparrows (Melospiza melodia) are aggressive year-round, even during the non-breeding season, when gonads are regressed and systemic testosterone (T) levels are non-detectable. In contrast, …
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Flight feather moult patterns and stable isotope analysis in the Woodland Kingfisher
… cycle that includes two migrations between the breeding and non-breeding grounds, the renewal of feathers and reproduction. All the mentioned processes are energetically expensive and they need special physiological adaptations. I investigated the timing of moult by actively catching Woodland …
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Potential Effects of Climate Change on the Distribution and Migration of European Breeding Migratory Birds
… birds by investigating simulated changes in breeding and non-breeding distribution. Methods: Generalised Additive Models were used to determine those climatic variables that produced the most robust species distribution models. Tests on the performance of three regression-based techniques …
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Movements and home range size of bald eagles from Glacier Bay National Park and Preserve, Alaska: with an analysis of satellite telemetry
… by homing and satellite telemetry. During the breeding season, the distances adult eagles moved from successful, unsuccessful, and mixed-success nests were not significantly different (£ = 0.148). Regardless of nest success, the proportion of adult eagle locations within 750 m of their nest …
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The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island
… less likely to move away during disturbance than non-breeding groups. Visit duration and approach distance affected behavioural responses. There was evidence of habituation by king penguins to current levels of incidental disturbance. Grey-headed albatross (Thalassarche chrysostoma) adults and …
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Social and environmental causes and reproductive consequences of ornamented plumage in the Red-backed Fairywren (Malurus melanocephalus)
… typically exhibit ornamented red-black breeding plumage, but this species offers unique opportunities to test the mechanisms that maintain the honesty of ornamented plumage because three-quarters of all one-year-old Red-backed Fairywrens spend their first breeding season in unornamented, …
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Drivers of variation in the migration and foraging strategies of pelagic seabirds
… mortality. Indeed, anthropogenic threats in non-breeding areas are a major cause of population declines and a better understanding of non-breeding spatial ecology is required in order to advance both ecological theory and conservation management. The recent development of animal tracking …
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The relationships between gonadotropin-releasing hormone, luteinizing hormone, and testosterone secretion in the male sheep
… were examined in intact rams in May (during the non-breeding season), September (breeding season), and March (transition between breeding and non-breeding season). A very high coincidence between GnRH and LH pulses was observed in the ram across the season. Individual LH pulses in May and …
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The spatial ecology and conservation of an important game bird in Ireland: the Eurasian woodcock
… the woodcock population comprises both resident breeding birds and migratory overwintering birds which originate from areas such as Fennoscandia, the Baltic States and Russia. The breeding population is thought to have declined in recent decades, with available evidence suggesting a range …
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Effects Of Food Deprivation On Blood Lipid Concentration And Composition In Steller Sea Lions (eumetopias Jubatus)
… lions, the largest Otariid, fast during their breeding season; during this time they refrain from ingesting food for a period of 12-43 days. Fasting, while undertaking an extremely energetically demanding activity (breeding and pupping), requires specific physiological adaptations. This study …
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THE ROLE OF PROLACTIN AND REPRODUCTIVE EXPERIENCE IN THE ONSET OF PARENTAL CARE IN THE ZEBRA FINCH (TAENIOPYGIA GUTTATA)
Parental care is a widespread phenomenon observed in many diverse taxa and is an important component of fitness. Birds are the largest parental vertebrate clade as 98% of avian species provide some variation of parental care. Despite this, we still know surprisingly little about the neuroendocrine …
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