Functional equivalence of grasping cerci and nuptial food gifts in promoting ejaculate transfer in katydids.

Hdl Handle:
http://hdl.handle.net/10545/592829
Title:
Functional equivalence of grasping cerci and nuptial food gifts in promoting ejaculate transfer in katydids.
Authors:
Vahed, Karim; Gilbert, James D. J.; Barrientos-Lozano, Ludivina; Weissman, David ( 0000-0001-9966-3338 )
Abstract:
The function of nuptial gifts has generated longstanding debate. Nuptial gifts consumed during ejaculate transfer may allow males to transfer more ejaculate than is optimal for females. However, gifts may simultaneously represent male investment in offspring. Evolutionary loss of nuptial gifts can help elucidate pressures driving their evolution. In most katydids (Orthoptera: Tettigoniidae), males transfer a spermatophore comprising two parts: the ejaculate-containing ampulla and the spermatophylax-a gelatinous gift that females eat during ejaculate transfer. Many species, however, have reduced or no spermatophylaces and many have prolonged copulation. Across 44 katydid species, we tested whether spermatophylaces and prolonged copulation following spermatophore transfer are alternative adaptations to protect the ejaculate. We also tested whether prolonged copulation was associated with (i) male cercal adaptations, helping prevent female disengagement, and (ii) female resistance behavior. As predicted, prolonged copulation following (but not before) spermatophore transfer was associated with reduced nuptial gifts, differences in the functional morphology of male cerci, and behavioral resistance by females during copulation. Furthermore, longer copulation following spermatophore transfer was associated with larger ejaculates, across species with reduced nuptial gifts. Our results demonstrate that nuptial gifts and the use of grasping cerci to prolong ejaculate transfer are functionally equivalent.
Affiliation:
University of Derby
Citation:
Vahed, K, Gilbert, J, Weissman, D, & Barrientos-Lozano, L 2014, 'Functional equivalence of grasping cerci and nuptial food gifts in promoting ejaculate transfer in katydids', Evolution; International Journal Of Organic Evolution, 68, 7, pp. 2052-2065
Publisher:
Wiley
Journal:
Evolution
Issue Date:
Jul-2014
URI:
http://hdl.handle.net/10545/592829
DOI:
10.1111/evo.12421
Additional Links:
http://doi.wiley.com/10.1111/evo.12421
Type:
Article
Language:
en
Series/Report no.:
Vol. 68; Issue 7
ISSN:
00143820
Appears in Collections:
Environmental Sustainability Research Centre

Full metadata record

DC FieldValue Language
dc.contributor.authorVahed, Karimen
dc.contributor.authorGilbert, James D. J.en
dc.contributor.authorBarrientos-Lozano, Ludivinaen
dc.contributor.authorWeissman, Daviden
dc.date.accessioned2016-01-05T13:04:03Zen
dc.date.available2016-01-05T13:04:03Zen
dc.date.issued2014-07en
dc.identifier.citationVahed, K, Gilbert, J, Weissman, D, & Barrientos-Lozano, L 2014, 'Functional equivalence of grasping cerci and nuptial food gifts in promoting ejaculate transfer in katydids', Evolution; International Journal Of Organic Evolution, 68, 7, pp. 2052-2065en
dc.identifier.issn00143820en
dc.identifier.doi10.1111/evo.12421en
dc.identifier.urihttp://hdl.handle.net/10545/592829en
dc.description.abstractThe function of nuptial gifts has generated longstanding debate. Nuptial gifts consumed during ejaculate transfer may allow males to transfer more ejaculate than is optimal for females. However, gifts may simultaneously represent male investment in offspring. Evolutionary loss of nuptial gifts can help elucidate pressures driving their evolution. In most katydids (Orthoptera: Tettigoniidae), males transfer a spermatophore comprising two parts: the ejaculate-containing ampulla and the spermatophylax-a gelatinous gift that females eat during ejaculate transfer. Many species, however, have reduced or no spermatophylaces and many have prolonged copulation. Across 44 katydid species, we tested whether spermatophylaces and prolonged copulation following spermatophore transfer are alternative adaptations to protect the ejaculate. We also tested whether prolonged copulation was associated with (i) male cercal adaptations, helping prevent female disengagement, and (ii) female resistance behavior. As predicted, prolonged copulation following (but not before) spermatophore transfer was associated with reduced nuptial gifts, differences in the functional morphology of male cerci, and behavioral resistance by females during copulation. Furthermore, longer copulation following spermatophore transfer was associated with larger ejaculates, across species with reduced nuptial gifts. Our results demonstrate that nuptial gifts and the use of grasping cerci to prolong ejaculate transfer are functionally equivalent.en
dc.language.isoenen
dc.publisherWileyen
dc.relation.ispartofseriesVol. 68en
dc.relation.ispartofseriesIssue 7en
dc.relation.urlhttp://doi.wiley.com/10.1111/evo.12421en
dc.rightsArchived with thanks to Evolutionen
dc.subjectNuptial giftsen
dc.subjectSexual conflicten
dc.subjectSexually antagonistic coevolutionen
dc.subjectSpermatophylaxen
dc.subjectSpermatophoreen
dc.titleFunctional equivalence of grasping cerci and nuptial food gifts in promoting ejaculate transfer in katydids.en
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.identifier.journalEvolutionen
dc.contributor.institutionDepartment of Biological and Forensic Sciences; College of Life and Natural Sciences; University of Derby; Kedleston Rd Derby DE22 1GB United Kingdomen
dc.contributor.institutionUniversity of Sussex; John Maynard Smith Building; Falmer Brighton BN1 9QG United Kingdomen
dc.contributor.institutionDepartment of Entomology; California Academy of Sciences; San Francisco California 94118en
dc.contributor.institutionInstituto Tecnológico de Cd. Victoria; Boulevard Emilio Portes Gil No. 1301, Cd. Victoria; Tamaulipas 87010 Méxicoen
All Items in UDORA are protected by copyright, with all rights reserved, unless otherwise indicated.