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3203 Southeast Woodstock Boulevard, Portland, Oregon 97202-8199

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"The Ancestral Modulation Hypothesis: Explaining mechanisms of sexual heteromorphism, cross-sexual transfer, and plasticity using fishes"

The heteromorphic features of the sexes have long been recognized by naturalists, but the appreciation for the diversity of those features within and across species has been a more recent development. No trait is universal to one sex across species and most heteromorphic traits have overlapping trait values within species. I have generated a hypothesis, the Ancestral Modulation Hypothesis (AMH), that seeks to describe how populations evolved mechanisms to generate sex-biased traits and how individuals and populations can take on trait values associated with the other sex, a process called cross-sexual transfer. The Ancestral Modulation Hypothesis proposes that mechanisms for sex-biased expression are generated through novel genomic features that take advantage of existing sex-biased signals while mechanisms for cross-sexual transfer are generated through alterations in sex-biased signals to access the sex-biased genomic features. Importantly, this suggests that cross-sexual transfer can be both a fixed change between or within populations and a plastic response to the environment within populations or individuals. I use different species of fishes to test the predictions of the AMH for traits such as ornamentation, mate choice, and parental roles. Fishes are an excellent taxa due to the remarkable diversity of sex-bias traits across the sexes found throughout the group when compared to other vertebrates. Confirming the AMH and describing cross-sexual transfer and its underlying mechanisms could explain why we see the diversity of sex expression across individuals within and across populations over a wide-range of sexually heteromorphic features.

Andrew Anderson's research focuses on sexually heteromorphic traits; everything from genetics to hormones, evolutionary patterns, mating systems, and behaviors

11:50 am- Snacks & Socializing
noon- Talk Begins



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