Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes
Sexual dimorphism is thought to have evolved via selection on both sexes. Ostracodes display sexual shape dimorphism in adult valves; however, no previous studies have addressed temporal changes on evolutionary timescales or examined the relationships between sexual shape dimorphism and selection pr...
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ftdryad:oai:v1.datadryad.org:10255/dryad.140036 2023-05-15T17:22:42+02:00 Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes Yamaguchi, Tatsuhiko Honda, Rie Matsui, Hiroki Nishi, Hiroshi North Atlantic Newfoundland Paleocene 2017-03-09T13:42:04Z http://hdl.handle.net/10255/dryad.132759 http://hdl.handle.net/10255/dryad.136300 http://hdl.handle.net/10255/dryad.140036 https://doi.org/10.5061/dryad.14j2m.3 unknown doi:10.5061/dryad.14j2m.3/2.3 doi:10.5061/dryad.14j2m.3/3.3 doi:10.5061/dryad.14j2m.3/1.3 doi:10.5061/dryad.14j2m.3/4.3 doi:10.5061/dryad.14j2m.3/5.3 doi:10.1017/pab.2016.57 doi:10.5061/dryad.14j2m.3 Yamaguchi T, Honda R, Matsui H, Nishi H (2017) Sexual shape dimorphism and selection pressure on males in fossil ostracodes. Paleobiology 43(03): 407-424. 0094-8373 http://hdl.handle.net/10255/dryad.132759 http://hdl.handle.net/10255/dryad.136300 http://hdl.handle.net/10255/dryad.140036 adult sex ratio sexual shape dimorphism selection pressure static allometry Article 2017 ftdryad https://doi.org/10.5061/dryad.14j2m.3 https://doi.org/10.5061/dryad.14j2m.3/2.3 https://doi.org/10.5061/dryad.14j2m.3/3.3 https://doi.org/10.5061/dryad.14j2m.3/1.3 https://doi.org/10.5061/dryad.14j2m.3/4.3 https://doi.org/10.5061/dryad.14j2m.3/5 2020-01-01T15:47:45Z Sexual dimorphism is thought to have evolved via selection on both sexes. Ostracodes display sexual shape dimorphism in adult valves; however, no previous studies have addressed temporal changes on evolutionary timescales or examined the relationships between sexual shape dimorphism and selection pressure and between sexual shape dimorphism and juvenile shape. Temporal changes in sexually dimorphic traits result from responses of these traits to selection pressure. Using the Gaussian mixture model for the height/length ratio, a valve-shape parameter, we identified sexual differences in the valve shape of Krithe dolichodeira s.l. from deep-sea sediments of the Paleocene (62.6–57.6 Ma) and estimated the proportion of females in the fossil populations at 11 time intervals. Because the proportion of females in a population is altered by the mortality rate of adult males, it is reflective of selection pressure on males. We attempted to correlate the height/length ratios between the sexes with the proportion of females, taking into consideration that the valve shape was not linked with the selection pressure on males. In time-series data of the height/length ratio, both sexes indicate no significant changes on evolutionary timescales, even though the sex ratio of the population changed from female skewed to male skewed during the late Paleocene. The sexual shape dimorphism was not driven by sexual selection. The static allometry between the height/length ratio and length indicates that the sexual shape dimorphism did not function for sexual display. The absence of change over time in the female allometric slope suggests that the evolution of valve shape was constrained by stasis. Article in Journal/Newspaper Newfoundland North Atlantic Dryad Digital Repository (Duke University) |
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Dryad Digital Repository (Duke University) |
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adult sex ratio sexual shape dimorphism selection pressure static allometry |
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adult sex ratio sexual shape dimorphism selection pressure static allometry Yamaguchi, Tatsuhiko Honda, Rie Matsui, Hiroki Nishi, Hiroshi Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes |
topic_facet |
adult sex ratio sexual shape dimorphism selection pressure static allometry |
description |
Sexual dimorphism is thought to have evolved via selection on both sexes. Ostracodes display sexual shape dimorphism in adult valves; however, no previous studies have addressed temporal changes on evolutionary timescales or examined the relationships between sexual shape dimorphism and selection pressure and between sexual shape dimorphism and juvenile shape. Temporal changes in sexually dimorphic traits result from responses of these traits to selection pressure. Using the Gaussian mixture model for the height/length ratio, a valve-shape parameter, we identified sexual differences in the valve shape of Krithe dolichodeira s.l. from deep-sea sediments of the Paleocene (62.6–57.6 Ma) and estimated the proportion of females in the fossil populations at 11 time intervals. Because the proportion of females in a population is altered by the mortality rate of adult males, it is reflective of selection pressure on males. We attempted to correlate the height/length ratios between the sexes with the proportion of females, taking into consideration that the valve shape was not linked with the selection pressure on males. In time-series data of the height/length ratio, both sexes indicate no significant changes on evolutionary timescales, even though the sex ratio of the population changed from female skewed to male skewed during the late Paleocene. The sexual shape dimorphism was not driven by sexual selection. The static allometry between the height/length ratio and length indicates that the sexual shape dimorphism did not function for sexual display. The absence of change over time in the female allometric slope suggests that the evolution of valve shape was constrained by stasis. |
format |
Article in Journal/Newspaper |
author |
Yamaguchi, Tatsuhiko Honda, Rie Matsui, Hiroki Nishi, Hiroshi |
author_facet |
Yamaguchi, Tatsuhiko Honda, Rie Matsui, Hiroki Nishi, Hiroshi |
author_sort |
Yamaguchi, Tatsuhiko |
title |
Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes |
title_short |
Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes |
title_full |
Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes |
title_fullStr |
Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes |
title_full_unstemmed |
Data from: Sexual shape dimorphism and selection pressure on males in fossil ostracodes |
title_sort |
data from: sexual shape dimorphism and selection pressure on males in fossil ostracodes |
publishDate |
2017 |
url |
http://hdl.handle.net/10255/dryad.132759 http://hdl.handle.net/10255/dryad.136300 http://hdl.handle.net/10255/dryad.140036 https://doi.org/10.5061/dryad.14j2m.3 |
op_coverage |
North Atlantic Newfoundland Paleocene |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_relation |
doi:10.5061/dryad.14j2m.3/2.3 doi:10.5061/dryad.14j2m.3/3.3 doi:10.5061/dryad.14j2m.3/1.3 doi:10.5061/dryad.14j2m.3/4.3 doi:10.5061/dryad.14j2m.3/5.3 doi:10.1017/pab.2016.57 doi:10.5061/dryad.14j2m.3 Yamaguchi T, Honda R, Matsui H, Nishi H (2017) Sexual shape dimorphism and selection pressure on males in fossil ostracodes. Paleobiology 43(03): 407-424. 0094-8373 http://hdl.handle.net/10255/dryad.132759 http://hdl.handle.net/10255/dryad.136300 http://hdl.handle.net/10255/dryad.140036 |
op_doi |
https://doi.org/10.5061/dryad.14j2m.3 https://doi.org/10.5061/dryad.14j2m.3/2.3 https://doi.org/10.5061/dryad.14j2m.3/3.3 https://doi.org/10.5061/dryad.14j2m.3/1.3 https://doi.org/10.5061/dryad.14j2m.3/4.3 https://doi.org/10.5061/dryad.14j2m.3/5 |
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1766109513526542336 |