Date of Award

2012

Degree Type

Thesis

Degree Name

M.Sc.

Department

Biological Sciences

First Advisor

Oliver P. Love

Second Advisor

Daniel J. Mennill

Keywords

Biological sciences, Antioxidant capacity, Honest signal, Oxidative damage, Oxidative stress, Snow bunting, Song

Rights

CC BY-NC-ND 4.0

Abstract

Sexual selection has led to the evolution of elaborate signals which enhance mate attraction and reproductive success. Often there is marked variation in signal quality between individuals yet little is known about the physiological mechanisms underlying this variation. Bird song is a signal used to attract mates and repel rivals and can vary between individuals in both content and performance. Oxidative stress is a potential mechanism that may affect song content and performance, explaining some of the inter-individual variation in signal quality. I investigated the relationship between song, oxidative status, and reproduction in the Snow Bunting ( Plectrophenax nivalis ) and found support for the Oxidation Handicap Hypothesis. Birds that sang at a higher rate had higher levels of reactive oxygen metabolites, but also had higher anti-oxidant capacities. Therefore, the ability to avoid oxidative stress is reliably indicated via song performance and reactive oxygen species may be the handicap ensuring signal honesty.

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