Presentation Details
| Alternative hypotheses for sexual size dimorphism in the Hispaniolan Woodpecker Joshua / B.LaPergola1, 2. 1Princeton University, Princeton, New Jersey, USA.2Fordham University, Bronx, New York, USA |
Abstract
Sexual size dimorphism (SSD), especially male-biased SSD, is often invoked as evidence of sexual selection, but non-sexual natural selection (i.e., ecological causes) may also play an important role. Few studies, though, have clearly identified examples of ecologically-driven SSD, with fewer still subjecting SSD to simultaneous testing of alternative adaptive explanations. The Hispaniolan Woodpecker (Melanerpes striatus; Aves: Picidae) is often cited as a textbook example of SSD in a feeding apparatus (i.e., the bill) in response to ecological release promoting reduced competition between the sexes, but alternative explanations have never been tested. This species exhibits a fascinatingly complex natural history rife for testing multiple hypotheses to explain its SSD. I will assess the historical case for the ecological causation hypothesis (i.e., reduced intersexual competition) and use new data to explore alternative hypotheses, including: reproductive role partitioning; social selection via competition over resources for reproduction; male-male competition for mates; and female choice for larger males.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
Content Locked. Log into a registered attendee account to access this presentation.