Estradiol, reproductive cycle and preference behavior in a northern swordtail

Mary E. Ramsey, Ryan Y. Wong, Molly E. Cummings

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Estrogen is associated with female sexual behaviors, particularly receptive behaviors during the reproductive cycle. Less is known about the relationship between estrogen and female preference behaviors that may precede receptivity and copulation. Separating the mechanisms underlying preference from receptivity is often confounded by the tightly coupled cycle- or estrogen-dependent expression of female sexual behaviors. Here we utilize a live-bearing poeciliid (Xiphophorus nigrensis), a model species for studying the evolution of female mate choice that can store sperm over multiple brood cycles. We assayed estradiol along with preference, receptivity and locomotor behaviors in gestating females and then re-tested these females on days 1, 7, 14, 21, and 28 post-parturition. With a posteriori reproductive cycle assessment, we asked whether reproductive state predicts differences in (i) estradiol levels, and (ii) behaviors (preference, receptivity, and general locomotor activity). We then examined if estradiol levels (independent of reproductive state) explain any variation in these behaviors. We found that endogenous estradiol levels vary across the reproductive cycle: gestating females had lower estradiol levels than those undergoing vitellogenesis/fertilization. In contrast, receptivity and preference behaviors did not vary over the reproductive cycle. Estradiol levels did not predict variation in receptive behavior, but were associated with increased locomotion. While individual female preference behaviors were consistent across the reproductive cycle, there was a small negative relationship between estradiol and preference behaviors explaining between 3% and 10% of the inter-female variation in preference behavior. Our data indicate X. nigrensis females may exhibit a facultatively dissociated reproductive system.

Original languageEnglish (US)
Pages (from-to)381-390
Number of pages10
JournalGeneral and Comparative Endocrinology
Volume170
Issue number2
DOIs
StatePublished - Jan 15 2011

Fingerprint

Xiphophorus
estradiol
Estradiol
estrogens
Estrogens
sexual behavior
Locomotion
Sexual Behavior
locomotion
Cyprinodontiformes
Vitellogenesis
Reproductive Behavior
Copulation
vitellogenesis
reproductive system
reproductive behavior
fertilization (reproduction)
mating behavior
Fertilization
copulation

Keywords

  • Dissociated reproduction
  • Estradiol
  • Mate choice
  • Preference behavior
  • Receptivity
  • Reproductive cycle
  • Sexual selection
  • Sperm storage
  • Xiphophorus nigrensis

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Endocrinology

Cite this

Estradiol, reproductive cycle and preference behavior in a northern swordtail. / Ramsey, Mary E.; Wong, Ryan Y.; Cummings, Molly E.

In: General and Comparative Endocrinology, Vol. 170, No. 2, 15.01.2011, p. 381-390.

Research output: Contribution to journalArticle

@article{90ab81eb70fd4c72be182ff49cb70fd3,
title = "Estradiol, reproductive cycle and preference behavior in a northern swordtail",
abstract = "Estrogen is associated with female sexual behaviors, particularly receptive behaviors during the reproductive cycle. Less is known about the relationship between estrogen and female preference behaviors that may precede receptivity and copulation. Separating the mechanisms underlying preference from receptivity is often confounded by the tightly coupled cycle- or estrogen-dependent expression of female sexual behaviors. Here we utilize a live-bearing poeciliid (Xiphophorus nigrensis), a model species for studying the evolution of female mate choice that can store sperm over multiple brood cycles. We assayed estradiol along with preference, receptivity and locomotor behaviors in gestating females and then re-tested these females on days 1, 7, 14, 21, and 28 post-parturition. With a posteriori reproductive cycle assessment, we asked whether reproductive state predicts differences in (i) estradiol levels, and (ii) behaviors (preference, receptivity, and general locomotor activity). We then examined if estradiol levels (independent of reproductive state) explain any variation in these behaviors. We found that endogenous estradiol levels vary across the reproductive cycle: gestating females had lower estradiol levels than those undergoing vitellogenesis/fertilization. In contrast, receptivity and preference behaviors did not vary over the reproductive cycle. Estradiol levels did not predict variation in receptive behavior, but were associated with increased locomotion. While individual female preference behaviors were consistent across the reproductive cycle, there was a small negative relationship between estradiol and preference behaviors explaining between 3{\%} and 10{\%} of the inter-female variation in preference behavior. Our data indicate X. nigrensis females may exhibit a facultatively dissociated reproductive system.",
keywords = "Dissociated reproduction, Estradiol, Mate choice, Preference behavior, Receptivity, Reproductive cycle, Sexual selection, Sperm storage, Xiphophorus nigrensis",
author = "Ramsey, {Mary E.} and Wong, {Ryan Y.} and Cummings, {Molly E.}",
year = "2011",
month = "1",
day = "15",
doi = "10.1016/j.ygcen.2010.10.012",
language = "English (US)",
volume = "170",
pages = "381--390",
journal = "General and Comparative Endocrinology",
issn = "0016-6480",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Estradiol, reproductive cycle and preference behavior in a northern swordtail

AU - Ramsey, Mary E.

AU - Wong, Ryan Y.

AU - Cummings, Molly E.

PY - 2011/1/15

Y1 - 2011/1/15

N2 - Estrogen is associated with female sexual behaviors, particularly receptive behaviors during the reproductive cycle. Less is known about the relationship between estrogen and female preference behaviors that may precede receptivity and copulation. Separating the mechanisms underlying preference from receptivity is often confounded by the tightly coupled cycle- or estrogen-dependent expression of female sexual behaviors. Here we utilize a live-bearing poeciliid (Xiphophorus nigrensis), a model species for studying the evolution of female mate choice that can store sperm over multiple brood cycles. We assayed estradiol along with preference, receptivity and locomotor behaviors in gestating females and then re-tested these females on days 1, 7, 14, 21, and 28 post-parturition. With a posteriori reproductive cycle assessment, we asked whether reproductive state predicts differences in (i) estradiol levels, and (ii) behaviors (preference, receptivity, and general locomotor activity). We then examined if estradiol levels (independent of reproductive state) explain any variation in these behaviors. We found that endogenous estradiol levels vary across the reproductive cycle: gestating females had lower estradiol levels than those undergoing vitellogenesis/fertilization. In contrast, receptivity and preference behaviors did not vary over the reproductive cycle. Estradiol levels did not predict variation in receptive behavior, but were associated with increased locomotion. While individual female preference behaviors were consistent across the reproductive cycle, there was a small negative relationship between estradiol and preference behaviors explaining between 3% and 10% of the inter-female variation in preference behavior. Our data indicate X. nigrensis females may exhibit a facultatively dissociated reproductive system.

AB - Estrogen is associated with female sexual behaviors, particularly receptive behaviors during the reproductive cycle. Less is known about the relationship between estrogen and female preference behaviors that may precede receptivity and copulation. Separating the mechanisms underlying preference from receptivity is often confounded by the tightly coupled cycle- or estrogen-dependent expression of female sexual behaviors. Here we utilize a live-bearing poeciliid (Xiphophorus nigrensis), a model species for studying the evolution of female mate choice that can store sperm over multiple brood cycles. We assayed estradiol along with preference, receptivity and locomotor behaviors in gestating females and then re-tested these females on days 1, 7, 14, 21, and 28 post-parturition. With a posteriori reproductive cycle assessment, we asked whether reproductive state predicts differences in (i) estradiol levels, and (ii) behaviors (preference, receptivity, and general locomotor activity). We then examined if estradiol levels (independent of reproductive state) explain any variation in these behaviors. We found that endogenous estradiol levels vary across the reproductive cycle: gestating females had lower estradiol levels than those undergoing vitellogenesis/fertilization. In contrast, receptivity and preference behaviors did not vary over the reproductive cycle. Estradiol levels did not predict variation in receptive behavior, but were associated with increased locomotion. While individual female preference behaviors were consistent across the reproductive cycle, there was a small negative relationship between estradiol and preference behaviors explaining between 3% and 10% of the inter-female variation in preference behavior. Our data indicate X. nigrensis females may exhibit a facultatively dissociated reproductive system.

KW - Dissociated reproduction

KW - Estradiol

KW - Mate choice

KW - Preference behavior

KW - Receptivity

KW - Reproductive cycle

KW - Sexual selection

KW - Sperm storage

KW - Xiphophorus nigrensis

UR - http://www.scopus.com/inward/record.url?scp=78650680185&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78650680185&partnerID=8YFLogxK

U2 - 10.1016/j.ygcen.2010.10.012

DO - 10.1016/j.ygcen.2010.10.012

M3 - Article

C2 - 20977908

AN - SCOPUS:78650680185

VL - 170

SP - 381

EP - 390

JO - General and Comparative Endocrinology

JF - General and Comparative Endocrinology

SN - 0016-6480

IS - 2

ER -