Profile image
Story Views

Last Hour:
Last 24 Hours:

SICB 2017: New Insights into Postocopulatory Selection on Anole Sperm

Tuesday, January 10, 2017 12:55
% of readers think this story is Fact. Add your two cents.
Doctoral candidate Ariel Kahrl presents her research on sperm evolution at SICB 2017.

Doctoral candidate Ariel Kahrl presents her research on sperm evolution at SICB 2017.

Every year since 2013, the Division of Ecology and Evolution (DEE) hosts the Huey Award Symposium at the annual SICB meeting. The Huey award is given for the best student presentation in DEE, in honor of Ray Huey, professor emeritus at the University of Washington. Ray’s career featured a lot of key research on anoles, and so there is often good representation by anole biologists at the Huey award. At this year’s symposium, Ariel Kahrl, a graduate student in Bob Cox’s lab at the University of Virginia, presented her research on pre- and postcopulatory selection in Anolis lizards.

We know that male competition for mates occurs both before copulation (mating success) and after copulation (sperm competition). Her research focuses on investigating the evolutionary connection between these two phases of competition. She found that larger males have smaller relative testis size, indicating a tradeoff between pre- and postcopulatory success, as larger males will have better success gaining access to females, but less sperm available for mating.

When she looked at testis and sperm morphology in greater detail, a few interesting patterns emerged. First, she found that testis size evolves faster than body size, consistent with other studies showing that reproductive organs evolve faster than other body traits. She also found that the midpiece section evolved faster than the head and the tail of the sperm. Importantly, the midpiece section of the sperm was strongly associated with male condition and sperm swimming speed, whereas the head and tail of the sperm were not associated with male  condition or sperm swimming performance. She further hypothesized that sperm count may be a more important target of selection than sperm morphology.


We encourage you to Share our Reports, Analyses, Breaking News and Videos. Simply Click your Favorite Social Media Button and Share.

Report abuse


Your Comments
Question   Razz  Sad   Evil  Exclaim  Smile  Redface  Biggrin  Surprised  Eek   Confused   Cool  LOL   Mad   Twisted  Rolleyes   Wink  Idea  Arrow  Neutral  Cry   Mr. Green

Top Stories
Recent Stories



Top Global


Top Alternative




Email this story
Email this story

If you really want to ban this commenter, please write down the reason:

If you really want to disable all recommended stories, click on OK button. After that, you will be redirect to your options page.