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Theses/Dissertations

2013

Biology

Morphology

Iowa State University

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Full-Text Articles in Life Sciences

Understanding Biodiversity: The Importance Of Sexual Dimorphism In The Micro- And Macroevolution Of Hummingbirds, Chelsea Marie Berns Jan 2013

Understanding Biodiversity: The Importance Of Sexual Dimorphism In The Micro- And Macroevolution Of Hummingbirds, Chelsea Marie Berns

Graduate Theses and Dissertations

ABSTRACT

For centuries, biologists have asked "why are there so many species, and why do we see such magnificent biological diversity?" This dissertation addresses this question by examining sexual size and shape dimorphism hummingbird bills at both a micro and macroevolutionary scale. Specifically, I quantify sexual size and shape dimorphism of bill morphology of 269 species of hummingbirds and begin with a species-level study to find that community structure might be a driving factor in the evolution of sexual size dimorphism in 2 sister species of hummingbirds, and the presence of sexual shape dimorphism in one of those species.

I ...