Horne, Curtis 
ORCID: https://orcid.org/0000-0003-2885-8546, Hirst, Andrew ORCID: https://orcid.org/0000-0001-9132-1886 and Atkinson, David
(2020)
Selection for increased male size predicts variation in sexual size dimorphism among fish species.
[Data Collection]
Description
Variation in the degree of sexual size dimorphism (SSD) among taxa is generally considered to arise from differences in the relative intensity of male-male competition and fecundity selection. One might predict, therefore, that SSD will vary systematically with: 1) the intensity of sexual selection for increased male size, and 2) the intensity of fecundity selection for increased female size. To test these two fundamental hypotheses, we conducted a phylogenetic comparative analysis of SSD in fish. Specifically, using records of body length at first sexual maturity from FishBase, we quantified variation in the magnitude and direction of SSD in >600 diverse freshwater and marine fish species, from sticklebacks to sharks. Although female-biased SSD was common, and thought to be driven primarily by fecundity selection, variation in SSD was not dependent on either the allometric scaling of reproductive-energy output or fecundity in female fish. Instead, systematic patterns based on habitat and life history characteristics associated with varying degrees of male-male competition and paternal care, strongly suggest that adaptive variation in SSD is driven by the intensity of sexual selection for increased male size.
| Keywords: | Dryad,sexual size dimorphism (SSD),comparative meta-analysis, |
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| Divisions: | Faculty of Health and Life Sciences |
| Depositing User: | Data Catalogue Admin |
| Date Deposited: | 23 Nov 2022 14:30 |
| Last Modified: | 26 Jan 2023 19:33 |
| DOI: | 10.5061/dryad.9zw3r229m |
| Original Record Link: | https://datadryad.org/stash/share/zS6yr7ygOryrzsbJiTiKiuCr4BeNLvOC5cj50Mia3Xg |
| URI: | https://datacat.liverpool.ac.uk/id/eprint/1878 |
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