We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Paternity data and relative testes size as measures of level of sperm competition in the Cercopithecoidea.
- Authors
Baker, R. Robin; Shackelford, Todd K.
- Abstract
Historically, the empirical study of the role of sperm competition in the evolution of sexual traits has been problematic through an enforced reliance on indirect proxy measures. Recently, however, a procedure was developed that uses paternity data to measure sperm competition level directly in terms of males/conception (i.e., the number of males that have sperm present in a female's ampulla at conception). When tested on apes and humans (Hominoidea) this measure proved not only to correlate significantly with the traditionally used measure of relative testes size but also to offer a number of advantages. Here we provide a second test of the procedure, this time using paternity data for the Old World monkeys (Cercopithecoidea). We calculate sperm competition levels (males/conception) for 17 species of wild and free‐ranging cercopithecoids and then analyze the data against measures of relative testes size. Calculated sperm competition levels correlate strongly with relative testes size both with and without phylogenetic control at both the species and generic levels. The signal‐to‐noise ratios inherent in both the past measure of relative testes size and the new measure of sperm competition level from paternity data are discussed. We conclude that although both measures are appropriate for the future study of the role of sperm competition in the evolution of sexual traits, when paternity data are available they provide the more direct and meaningful analytical tool. Not least, they potentially allow a first empirical analysis of the role of sperm competition in the evolution of relative testes size that could then be compared with the wealth of theoretical analyses that already exist. A procedure was recently developed (2018) that uses paternity data to measure sperm competition level directly in terms of males/conception. When first tested on apes and humans (Hominoidea), this measure proved not only to be as effective an analytical tool as the more traditional proxy measure of relative testes size but also to offer a number of advantages. Here, we provide a second test of the procedure, this time using paternity data for Old World monkeys (Cercopithecoidea), and once again demonstrate the procedure's potential efficacy and relative accuracy for future studies of the role of sperm competition in the evolution of sexual traits.
- Subjects
ANIMAL paternity; CERCOPITHECIDAE behavior; SPERMATOZOA; PRIMATE reproduction; ANIMAL sexual behavior; SIGNAL-to-noise ratio; MAMMALS
- Publication
American Journal of Primatology, 2018, Vol 80, Issue 12, pN.PAG
- ISSN
0275-2565
- Publication type
Article
- DOI
10.1002/ajp.22937