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    Reproductive decisions by black brant: mechanisms to synchronize hatch and spatial variation in growth rates of goslings

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    Author
    Nicolai, Christopher Andrew
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    URI
    http://hdl.handle.net/11122/6441
    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.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2003
    Table of Contents
    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.
    Date
    2003-08
    Type
    Thesis
    Collections
    Biological Sciences

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