Acknowledgements
I wish to thank Ben Gilbert and Art Weis for advice and financial
support, and the staff and students of the Koffler Scientific Reserve
for their assistance. Stephen De Lisle and Colin Bonner were key
collaborators and sounding boards when beginning this work. I was
variously supported by Sigma Xi, NSERC, OGS, the University of Toronto,
and the Center for Population Biology (UC Davis) while collecting data
and writing this manuscript.