Dissertation/Thesis Abstract

Do male and female brown-headed cowbirds see their world differently? Implications for sex differences in the sensory system of a brood parasite
by Ojeda-Figueroa, Agustin R., M.S., California State University, Long Beach, 2013, 55; 1523046
Abstract (Summary)

Little is known as to how physiological differences may affect behaviors associated with visual information gathering. Males and females brown-headed cowbirds (Molothrus ater) are exposed to different selection pressures. I tested the hypotheses that these different selection pressures require males to have a higher density of photoreceptors to detect the female's courting display, and that females require to expose their organs used to collect visual information to the object of interest with a more frequent succession to obtain quality visual information. Females had a significantly lower density of single and double cones than males. Females had significantly higher head-movement rates than males when visually exploring stationary objects. These results suggest that females have lower visual resolution than males, and compensate for that by moving their heads more quickly and exposing objects to different parts of the retina.

Indexing (document details)
Advisor: Sinchak, Kevin
Commitee: Fernandez-Juricic, Esteban, Lowe, Christopher
School: California State University, Long Beach
Department: Biological Sciences
School Location: United States -- California
Source: MAI 52/01M(E), Masters Abstracts International
Subjects: Morphology, Zoology
Keywords: Molothrus ater, Photoreceptors, Sensory compensation, Sex differences
Publication Number: 1523046
ISBN: 978-1-303-20219-3
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