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Temporal shifts in ostracode sexual dimorphism from the Late Cretaceous to the late Eocene of the U.S. Coastal Plain

2022-07Journal article Open access
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dc.contributor.authorSamuels-Fair, Maya
dc.contributor.authorMartins, Maria Joao Fernandes
dc.contributor.authorLockwood, Rowan
dc.contributor.authorSwaddle, John P.
dc.contributor.authorHunt, Gene
dc.date.accessioned2022-12-09T13:20:12Z
dc.date.available2022-12-09T13:20:12Z
dc.date.issued2022-07
dc.description.abstractOstracodes of the superfamily Cytheroidea exhibit sexual dimorphism in the carapace such that males are more elongate than females. This sex difference is attributed to the need of the carapace to accommodate the large male copulatory apparatus, and the degree of dimorphism is an indication of male investment in reproduction. In this study, we examine trends in sexual dimorphism, as a proxy for sexual selection, from the Late Cretaceous to the late Eocene to better understand the long-term effects of the Cretaceous/Paleogene mass extinction. We used mixture models to identify sex clusters from digitized outlines of photographed specimens and estimated size and shape dimorphism as the difference in the mean log area and the mean log length-to-height ratio for male and female clusters. We found dimorphism exhibits a phylogenetic signal; families and genera tend to occupy various restricted subsets of dimorphism space. Previous work documented that the mean and variance in size and shape dimorphism decreased sharply at the Cretaceous/Paleogene boundary, and here we show that this fauna only partially returns to Cretaceous dimorphism patterns by the late Eocene. Most surprisingly, species with both high size and shape dimorphism, which occurred in a diverse set of taxa before the extinction, remain rare into the late Eocene. These trends suggest sexual selection may respond to several possible demographic and environmental factors, which warrant further investigation.pt_PT
dc.description.sponsorshipNSF-EAR 1424906; NSF-OCE 1560088
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.marmicro.2020.101959pt_PT
dc.identifier.eissn1872-6186
dc.identifier.urihttp://hdl.handle.net/10400.1/18610
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectOstracodapt_PT
dc.subjectSexual dimorphismpt_PT
dc.subjectSexual selectionpt_PT
dc.subjectPaleogenept_PT
dc.titleTemporal shifts in ostracode sexual dimorphism from the Late Cretaceous to the late Eocene of the U.S. Coastal Plainpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage101959pt_PT
oaire.citation.titleMarine Micropaleontologypt_PT
oaire.citation.volume174pt_PT
person.familyNameFernandes Martins
person.givenNameMaria João
person.identifierA-6948-2013
person.identifier.ciencia-idD91A-79B0-2288
person.identifier.orcid0000-0002-9118-7397
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication9b55b524-d0b3-4c9b-9eaa-a0eeb73f5862
relation.isAuthorOfPublication.latestForDiscovery9b55b524-d0b3-4c9b-9eaa-a0eeb73f5862

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