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Copulation with immature females increases male fitness in cannibalistic widow spiders
Year:
2016
Source of publication :
Biology Letters
Authors :
הררי, אלי
;
.
Volume :
12
Co-Authors:
Biaggio, M.D., Department of Biological Sciences, University of Toronto Scarborough, Toronto, Canada, Department of Ecology and Evolutionary Biology, University of Toronto Scarborough, Toronto, Canada
Sandomirsky, I., Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Beersheba, Israel
Lubin, Y., Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Beersheba, Israel
Harari, A.R., Department of Entomology, Volcani Center, Bet Dagan, Israel
Andrade, M.C.B., Department of Biological Sciences, University of Toronto Scarborough, Toronto, Canada, Department of Ecology and Evolutionary Biology, University of Toronto Scarborough, Toronto, Canada
Facilitators :
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Total pages:
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Abstract:
Copulatory cannibalism of male 'widow' spiders (genus Latrodectus) is a model example of the extreme effects of sexual selection, particularly in L. hasselti and L. geometricus where males typically facilitate cannibalism by females and mate only once. We show that these males can increase their reproductive success by copulating with final-instar, immature females after piercing the female's exoskeleton to access her newly developed sperm storage organs. Females retain sperm through their final moult and have similar fecundity to adultmated females. This is an adaptive male tactic because immature mating increases insemination success relative to adult mating (which predicts higher paternity) and moreover, rarely ends in cannibalism, so males can mate again. Although successful only during a brief period before the female's final moult, males may employ this tactic when they associate with final-instar females in nature. Consistent with this, one-third of L. hasselti females collected as immatures in nature were already mated. Immature mating alters sexual selection on these otherwise monogynous males, and may explain male traits allowing facultative polygyny in Latrodectus. Since male cohabitation with immature females is common among invertebrates, immature mating may be a widespread, previously unrecognized mating tactic, particularly when unmated females are of high reproductive value. © 2016 The Author(s) Published by the Royal Society. All rights reserved.
Note:
Related Files :
Alternative male mating tactic
Invertebrata
Latrodectus
Latrodectus geometricus
Mating immature females
Sexual selection
עוד תגיות
תוכן קשור
More details
DOI :
10.1098/rsbl.2016.0516
Article number:
20160516
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23882
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:03
Scientific Publication
Copulation with immature females increases male fitness in cannibalistic widow spiders
12
Biaggio, M.D., Department of Biological Sciences, University of Toronto Scarborough, Toronto, Canada, Department of Ecology and Evolutionary Biology, University of Toronto Scarborough, Toronto, Canada
Sandomirsky, I., Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Beersheba, Israel
Lubin, Y., Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Beersheba, Israel
Harari, A.R., Department of Entomology, Volcani Center, Bet Dagan, Israel
Andrade, M.C.B., Department of Biological Sciences, University of Toronto Scarborough, Toronto, Canada, Department of Ecology and Evolutionary Biology, University of Toronto Scarborough, Toronto, Canada
Copulation with immature females increases male fitness in cannibalistic widow spiders
Copulatory cannibalism of male 'widow' spiders (genus Latrodectus) is a model example of the extreme effects of sexual selection, particularly in L. hasselti and L. geometricus where males typically facilitate cannibalism by females and mate only once. We show that these males can increase their reproductive success by copulating with final-instar, immature females after piercing the female's exoskeleton to access her newly developed sperm storage organs. Females retain sperm through their final moult and have similar fecundity to adultmated females. This is an adaptive male tactic because immature mating increases insemination success relative to adult mating (which predicts higher paternity) and moreover, rarely ends in cannibalism, so males can mate again. Although successful only during a brief period before the female's final moult, males may employ this tactic when they associate with final-instar females in nature. Consistent with this, one-third of L. hasselti females collected as immatures in nature were already mated. Immature mating alters sexual selection on these otherwise monogynous males, and may explain male traits allowing facultative polygyny in Latrodectus. Since male cohabitation with immature females is common among invertebrates, immature mating may be a widespread, previously unrecognized mating tactic, particularly when unmated females are of high reproductive value. © 2016 The Author(s) Published by the Royal Society. All rights reserved.
Scientific Publication
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