Please use this identifier to cite or link to this item:
|Title:||Sexual selection accounts for the geographic reversal of sexual size dimorphism in the dung fly, sepsis punctum (diptera: Sepsidae)|
|Authors:||Puniamoorthy, N. |
|Citation:||Puniamoorthy, N., Schäfer, M.A., Blanckenhorn, W.U. (2012-07). Sexual selection accounts for the geographic reversal of sexual size dimorphism in the dung fly, sepsis punctum (diptera: Sepsidae). Evolution 66 (7) : 2117-2126. ScholarBank@NUS Repository. https://doi.org/10.1111/j.1558-5646.2012.01599.x|
|Abstract:||Sexual size dimorphism (SSD) varies widely across and within species. The differential equilibrium model of SSD explains dimorphism as the evolutionary outcome of consistent differences in natural and sexual selection between the sexes. Here, we comprehensively examine a unique cross-continental reversal in SSD in the dung fly, Sepsis punctum. Using common garden laboratory experiments, we establish that SSD is male-biased in Europe and female-biased in North America. When estimating sexual (pairing success) and fecundity selection (clutch size of female partner) on males under three operational sex ratios (OSRs), we find that the intensity of sexual selection is significantly stronger in European versus North American populations, increasing with male body size and OSR in the former only. Fecundity selection on female body size also increases strongly with egg number and weakly with egg volume, however, equally on both continents. Finally, viability selection on body size in terms of intrinsic (physiological) adult life span in the laboratory is overall nil and does not vary significantly across all seven populations. Although it is impossible to prove causality, our results confirm the differential equilibrium model of SSD in that differences in sexual selection intensity account for the reversal in SSD in European versus North American populations, presumably mediating the ongoing speciation process in S. punctum. © 2012 The Author(s). Evolution © 2012 The Society for the Study of Evolution.|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Dec 13, 2018
WEB OF SCIENCETM
checked on Dec 13, 2018
checked on Nov 9, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.