Extreme ecology and mating system: Discriminating among direct benefits models in red flour beetles

Elizabeth M. Droge-Young, John M. Belote, Anjalika Eeswara, Scott S Pitnick

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We address the adaptive significance of female remating in the red flour beetle, Tribolium castaneum, a model system with an extreme mating system of little-to-no premating discrimination and rapid remating. In light of their specific ecology: the occupation of dried grain stores with no use of liquid water, we tested predictions of 4 nonmutually exclusive hypotheses addressing direct benefits that females may receive from mating: 1) topping off of sperm, 2) oviposition-stimulating seminal plasma, 3) ejaculate-derived nutrition, or 4) hydration by the ejaculate. By examining the female fitness consequences of exposure to differing humidity and nutrition environments and exposure to males manipulated to deliver different ejaculate products during mating, we found strong support only for the ejaculate hydration hypothesis. We also investigated the effects of promiscuity on males and found evidence that providing moisture in the ejaculate is costly. This is in contrast to the frequently found pattern of sexual antagonism in which males benefit from an elevated mating rate at a cost to female fitness. We found no evidence that short-term exposure to different humidity conditions influences either female remating behavior or male competitive fertilization success. We consider the role of T. castaneum's ecology and mechanisms of postcopulatory sexual selection on the evolution of its mating system.

Original languageEnglish (US)
Pages (from-to)575-583
Number of pages9
JournalBehavioral Ecology
Volume27
Issue number2
DOIs
StatePublished - 2016

Fingerprint

Tribolium castaneum
mating systems
reproductive strategy
beetle
ecology
hydration
nutrition
humidity
fitness
female behavior
antagonism
grain storage facilities
sexual selection
oviposition
sperm
seminal plasma
occupation
Castanea
fertilization (reproduction)
moisture

Keywords

  • Direct effects
  • Ejaculate hydration
  • Environmental stress
  • Nuptial gift
  • Sexual conflict
  • Sexual selection

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

Extreme ecology and mating system : Discriminating among direct benefits models in red flour beetles. / Droge-Young, Elizabeth M.; Belote, John M.; Eeswara, Anjalika; Pitnick, Scott S.

In: Behavioral Ecology, Vol. 27, No. 2, 2016, p. 575-583.

Research output: Contribution to journalArticle

Droge-Young, Elizabeth M. ; Belote, John M. ; Eeswara, Anjalika ; Pitnick, Scott S. / Extreme ecology and mating system : Discriminating among direct benefits models in red flour beetles. In: Behavioral Ecology. 2016 ; Vol. 27, No. 2. pp. 575-583.
@article{f514c825b3774563ba2c5d561233cf45,
title = "Extreme ecology and mating system: Discriminating among direct benefits models in red flour beetles",
abstract = "We address the adaptive significance of female remating in the red flour beetle, Tribolium castaneum, a model system with an extreme mating system of little-to-no premating discrimination and rapid remating. In light of their specific ecology: the occupation of dried grain stores with no use of liquid water, we tested predictions of 4 nonmutually exclusive hypotheses addressing direct benefits that females may receive from mating: 1) topping off of sperm, 2) oviposition-stimulating seminal plasma, 3) ejaculate-derived nutrition, or 4) hydration by the ejaculate. By examining the female fitness consequences of exposure to differing humidity and nutrition environments and exposure to males manipulated to deliver different ejaculate products during mating, we found strong support only for the ejaculate hydration hypothesis. We also investigated the effects of promiscuity on males and found evidence that providing moisture in the ejaculate is costly. This is in contrast to the frequently found pattern of sexual antagonism in which males benefit from an elevated mating rate at a cost to female fitness. We found no evidence that short-term exposure to different humidity conditions influences either female remating behavior or male competitive fertilization success. We consider the role of T. castaneum's ecology and mechanisms of postcopulatory sexual selection on the evolution of its mating system.",
keywords = "Direct effects, Ejaculate hydration, Environmental stress, Nuptial gift, Sexual conflict, Sexual selection",
author = "Droge-Young, {Elizabeth M.} and Belote, {John M.} and Anjalika Eeswara and Pitnick, {Scott S}",
year = "2016",
doi = "10.1093/beheco/arv191",
language = "English (US)",
volume = "27",
pages = "575--583",
journal = "Behavioral Ecology",
issn = "1045-2249",
publisher = "Oxford University Press",
number = "2",

}

TY - JOUR

T1 - Extreme ecology and mating system

T2 - Discriminating among direct benefits models in red flour beetles

AU - Droge-Young, Elizabeth M.

AU - Belote, John M.

AU - Eeswara, Anjalika

AU - Pitnick, Scott S

PY - 2016

Y1 - 2016

N2 - We address the adaptive significance of female remating in the red flour beetle, Tribolium castaneum, a model system with an extreme mating system of little-to-no premating discrimination and rapid remating. In light of their specific ecology: the occupation of dried grain stores with no use of liquid water, we tested predictions of 4 nonmutually exclusive hypotheses addressing direct benefits that females may receive from mating: 1) topping off of sperm, 2) oviposition-stimulating seminal plasma, 3) ejaculate-derived nutrition, or 4) hydration by the ejaculate. By examining the female fitness consequences of exposure to differing humidity and nutrition environments and exposure to males manipulated to deliver different ejaculate products during mating, we found strong support only for the ejaculate hydration hypothesis. We also investigated the effects of promiscuity on males and found evidence that providing moisture in the ejaculate is costly. This is in contrast to the frequently found pattern of sexual antagonism in which males benefit from an elevated mating rate at a cost to female fitness. We found no evidence that short-term exposure to different humidity conditions influences either female remating behavior or male competitive fertilization success. We consider the role of T. castaneum's ecology and mechanisms of postcopulatory sexual selection on the evolution of its mating system.

AB - We address the adaptive significance of female remating in the red flour beetle, Tribolium castaneum, a model system with an extreme mating system of little-to-no premating discrimination and rapid remating. In light of their specific ecology: the occupation of dried grain stores with no use of liquid water, we tested predictions of 4 nonmutually exclusive hypotheses addressing direct benefits that females may receive from mating: 1) topping off of sperm, 2) oviposition-stimulating seminal plasma, 3) ejaculate-derived nutrition, or 4) hydration by the ejaculate. By examining the female fitness consequences of exposure to differing humidity and nutrition environments and exposure to males manipulated to deliver different ejaculate products during mating, we found strong support only for the ejaculate hydration hypothesis. We also investigated the effects of promiscuity on males and found evidence that providing moisture in the ejaculate is costly. This is in contrast to the frequently found pattern of sexual antagonism in which males benefit from an elevated mating rate at a cost to female fitness. We found no evidence that short-term exposure to different humidity conditions influences either female remating behavior or male competitive fertilization success. We consider the role of T. castaneum's ecology and mechanisms of postcopulatory sexual selection on the evolution of its mating system.

KW - Direct effects

KW - Ejaculate hydration

KW - Environmental stress

KW - Nuptial gift

KW - Sexual conflict

KW - Sexual selection

UR - http://www.scopus.com/inward/record.url?scp=84983788926&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84983788926&partnerID=8YFLogxK

U2 - 10.1093/beheco/arv191

DO - 10.1093/beheco/arv191

M3 - Article

AN - SCOPUS:84983788926

VL - 27

SP - 575

EP - 583

JO - Behavioral Ecology

JF - Behavioral Ecology

SN - 1045-2249

IS - 2

ER -