October 14 2009

12:00 LSB 2320

Rick Grosberg
Center for Population Biology, UC Davis

All in the family: constraints on the resolution of multiway conflicts of interest in a marine snail.


Families are a ubiquitous and distinctively annoying venue where multiway conflicts of interest arise between males
and females, parents and offspring, and siblings. The mating system, especially in polygamous species, plays a
pivotal role in governing the direction and magnitude of these family conflicts. Solenosteira macrospira is a marine
snail whose reproductive biology embodies multiple forms of family conflict, and, consequently, offers an incisive
opportunity to explore the constraints and opportunities for resolving such conflicts of interest. S. macrospira females
mate multiply, and package offspring in capsules, each containing 200-300 siblings. As in many other organisms that
package their broods in nurseries, juveniles cannibalize sibling eggs, zygotes, and embryos within egg capsules.
Quite remarkably, female S. macrospira oviposit almost exclusively on males (>99%), and virtually never on
conspecific females or other objects. Brood carrying is energetically costly to males; but, it is also essential for brood
survival. In this talk, I characterize (1) oviposition behavior; (2) costs of parental care; (3) the nature of sibling
conflict; and (4) the effects of the mating system on the ecology and evolution of male parental care, and the
resolution of parent-offspring and sibling conflict in this, and other, polyandrous species.











































































































































































































































































































































































































































































































































































































this is idtest: