SEARS, Michael W; ANGILLETTA, Michael J; PORTER, Warren P; Indiana State University; Indiana State University; University of Wisconsin-Madison: Getting back to nature: ecological influences on patterns of growth and body size in squamate reptiles Recently, there has been much interest in geographic patterns of growth and body size in all taxonomic groups. Though many, if […]

BLANCKENHORN, W.U.; University of Zurich, Zoological Museum: Bergmann’s rule, the converse and countergradients: Clinal body size variation in dung flies and water striders. At least four different evolutionary patterns or hypotheses (co)exist concerning clinal variation in body size and associated life history traits: (1) Bergmann’s rule (body size increases with latitude, a temperature effect); (2) […]

ASHTON, Kyle/G.; Kutztown University: Are There General Body Size-Latitude (and Temperature) Trends in Vertebrates? Biologists have long been interested in identifying general patterns of geographic variation in body size, and its relationship with environmental parameters. Meta-analytical techniques provide an excellent tool for testing for such patterns. Using these techniques, I have shown strong evidence for […]

LORCH, P. D.; Univ. of North Carolina, Chapel Hill: Using upper limits on sexual selection to estimate the opportunity for sexual selection and to understand reversals in typical sex-roles The widespread use of molecular markers to estimate parentage make possible a better index of the opportunity for sexual selection. I develop such an index. First, […]

PARKER, P.G.; University of Missouri — St. Louis: Recent Insights into Sexual Selection in Bird Mating Systems: What Bateman Couldn’t Have Known Since tools of molecular genetics became readily available, our understanding of bird mating systems has undergone a revolution. The majority of passerine species investigated are socially monogamous, but have been shown to be […]

WADE, M.J.; SHUSTER, S.M.; Indiana University; Northern Arizona University: Don\’t Throw Bateman Out With the Bathwater! Darwin recognized two patterns in nature and used them to frame the central questions of sexual selection: (1) Why do males and females of the same species differ from one another, with males exhibiting morphological and behavioral phenotypes more […]

LEVITAN, Don/R.; Florida State University: Density-dependent sexual selection and the evolution of sexual dimorphism in external fertilizers The stunning absence of sexual dimorphism in adult morphological traits among broadcast spawning invertebrates was originally thought to be a consequence of reduced or absent sexual selection among these taxa. However, there is no reason why broadcast-spawning animals […]

HAUBER, ME; LACEY, EA; Univ. of California, Berkeley: Bateman�s Principle in Social Mammals: The Influence of Cooperative Breeding on Variance in Female and Male Reproductive Success Sex-specific slopes of Bateman gradient curves have important implications for reproductive behavior, including patterns of sexual selection and reproductive competition among conspecifics. In general, intersexual differences in the fitness […]

DREA, C.M.; Duke University: Bateman revisited: Sexually assertive female primates and their cryptic reproductive tactics The breeding system of an animal population is thought to depend on the ability of one sex (usually the male) to acquire mates, either directly through association or indirectly through defense of resources. According to this view, the sex that […]

JONES, Adam; Georgia Institute of Technology: Validation of Bateman’s principles: Comparative evidence from taxa with conventional and reversed sex roles With the advent of molecular techniques, we can now measure mating systems and the intensity of sexual selection in natural population with unprecedented detail. Widespread adoption of a standard approach to the statistical characterization of […]