Data from: Behavioral and morphological traits interact to promote the evolution of alternative reproductive tactics in a lizard

Alternative reproductive tactics (ARTs) are predicted to be the result of
disruptive correlational selection on suites of morphological,
physiological and behavioral traits. ARTs are most obvious when they occur
in discrete morphs with concomitant behavioral tactics. However, ARTs
driven by behavior, in species lacking obvious phenotypic differences, are
rarely documented and poorly understood. We quantified selection acting on
phenotypic traits predicted to characterize ARTs by observing marked
lizards in six semi-natural populations. We quantified reproductive
fitness for each male using 6 microsatellite DNA loci from 226 offspring
born to 56 females. Candidate models containing directional and
correlational selection gradients were equally supported. As predicted,
large males with large home ranges and large males who were observed
frequently had the highest reproductive success. We also found evidence
that large males that moved little, but were observed frequently and large
males which moved frequently, but were observed little, were predicted to
have high fitness. Model predictions support our verbal hypothesis
regarding the phenotypes characterizing ARTs and suggest that large males
may be adopting subtly different tactics to acquire paternity. Our results
suggest that disruptive correlational selection between behavioral traits
may drive the evolution of ARTs in 'cryptic' systems that lack
overt polymorphisms.