Sexual dimorphism in primate aerobic capacity: a phylogenetic test
2010 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 23, no 6, 1183-1194 p.Article in journal (Refereed) Published
Male intrasexual competition should favour increased male physical prowess.This should in turn result in greater aerobic capacity in males than in females(i.e. sexual dimorphism) and a correlation between sexual dimorphism inaerobic capacity and the strength of sexual selection among species. However,physiological scaling laws predict that aerobic capacity should be lower perunit body mass in larger than in smaller animals, potentially reducing orreversing the sex difference and its association with measures of sexualselection. We used measures of haematocrit and red blood cell (RBC) countsfrom 45 species of primates to test four predictions related to sexual selectionand body mass: (i) on average, males should have higher aerobic capacity thanfemales, (ii) aerobic capacity should be higher in adult than juvenile males,(iii) aerobic capacity should increase with increasing sexual selection, but alsothat (iv) measures of aerobic capacity should co-vary negatively with bodymass. For the first two predictions, we used a phylogenetic paired t-testdeveloped for this study. We found support for predictions (i) and (ii). For prediction (iii), however, we found a negative correlation between the degreeof sexual selection and aerobic capacity, which was opposite to our prediction.Prediction (iv) was generally supported. We also investigated whethersubstrate use, basal metabolic rate and agility influenced physiologicalmeasures of oxygen transport, but we found only weak evidence for acorrelation between RBC count and agility.
Place, publisher, year, edition, pages
2010. Vol. 23, no 6, 1183-1194 p.
IdentifiersURN: urn:nbn:se:su:diva-42127DOI: 10.1111/j.1420-9101.2010.01983.xISI: 000277710100007OAI: oai:DiVA.org:su-42127DiVA: diva2:344023