Reproductive decisions by black brant: mechanisms to synchronize hatch and spatial variation in growth rates of goslings
dc.contributor.author | Nicolai, Christopher Andrew | |
dc.date.accessioned | 2016-03-31T00:01:26Z | |
dc.date.available | 2016-03-31T00:01:26Z | |
dc.date.issued | 2003-08 | |
dc.identifier.uri | http://hdl.handle.net/11122/6441 | |
dc.description | Thesis (M.S.) University of Alaska Fairbanks, 2003 | en_US |
dc.description.abstract | I investigated two aspects of reproductive decisions in Black Brant: synchronous hatch within clutches and areas in which to rear their broods. It has been hypothesized that Anatidae facilitate a synchronous hatch through vocalizations among embryos within the same clutch. I performed manipulative experiments in which variation was controlled for both genetic and incubation pattern sources in incubation period length. Our results suggest that vocalizations are not responsible for a synchronous hatch, and I suggest that inherent properties of the eggs themselves are responsible for a synchronous hatch. Additionally, I compared gosling growth rates from areas of low nest densities with those from a main colony to test the hypothesis that broods using dispersed areas were escaping density dependent effects. I found that goslings from dispersed nesting areas did not escape density dependent effects and may actually constitute a sink for the population from additional effects of increased nest mortality in dispersed nesting area. | en_US |
dc.description.tableofcontents | Ch. 1. Regulation of development time and hatch synchronization ihn black brant (Branta bernicla nigricans) -- ch. 2. Do black brant goslings from satellite colonies on the Yukon-Kuskokwim Delta, Alaska experience reduced density dependence? -- Summary. | en_US |
dc.language.iso | en_US | en_US |
dc.title | Reproductive decisions by black brant: mechanisms to synchronize hatch and spatial variation in growth rates of goslings | en_US |
dc.type | Thesis | en_US |
refterms.dateFOA | 2020-01-25T02:12:12Z |
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Biological Sciences
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