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Variation in oxytocin is related to variation in affiliative behavior in monogamous, pairbonded tamarins.

Abstract

Oxytocin plays an important role in monogamous pairbonded female voles, but not in polygamous voles. Here we examined a socially monogamous cooperatively breeding primate where both sexes share in parental care and territory defense for within species variation in behavior and female and male oxytocin levels in 14 pairs of cotton-top tamarins (Saguinus oedipus). In order to obtain a stable chronic assessment of hormones and behavior, we observed behavior and collected urinary hormonal samples across the tamarins' 3-week ovulatory cycle. We found similar levels of urinary oxytocin in both sexes. However, basal urinary oxytocin levels varied 10-fold across pairs and pair-mates displayed similar oxytocin levels. Affiliative behavior (contact, grooming, sex) also varied greatly across the sample and explained more than half the variance in pair oxytocin levels. The variables accounting for variation in oxytocin levels differed by sex. Mutual contact and grooming explained most of the variance in female oxytocin levels, whereas sexual behavior explained most of the variance in male oxytocin levels. The initiation of contact by males and solicitation of sex by females were related to increased levels of oxytocin in both. This study demonstrates within-species variation in oxytocin that is directly related to levels of affiliative and sexual behavior. However, different behavioral mechanisms influence oxytocin levels in males and females and a strong pair relationship (as indexed by high levels of oxytocin) may require the activation of appropriate mechanisms for both sexes.

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  • Authors+Show Affiliations

    ,

    Department of Psychology, University of Wisconsin-Madison, Wisconsin National Research Center, Madison, WI 53706, USA. Snowdon@wisc.edu

    , , , ,

    Source

    Hormones and behavior 58:4 2010 Sep pg 614-8

    MeSH

    Animals
    Behavior, Animal
    Estradiol
    Female
    Hydrocortisone
    Individuality
    Male
    Oxytocin
    Pair Bond
    Saguinus
    Social Behavior

    Pub Type(s)

    Journal Article
    Research Support, N.I.H., Extramural
    Validation Studies

    Language

    eng

    PubMed ID

    20600045

    Citation

    TY - JOUR T1 - Variation in oxytocin is related to variation in affiliative behavior in monogamous, pairbonded tamarins. AU - Snowdon,Charles T, AU - Pieper,Bridget A, AU - Boe,Carla Y, AU - Cronin,Katherine A, AU - Kurian,Aimee V, AU - Ziegler,Toni E, Y1 - 2010/06/28/ PY - 2010/03/29/received PY - 2010/06/18/revised PY - 2010/06/23/accepted PY - 2010/7/6/entrez PY - 2010/7/6/pubmed PY - 2011/1/25/medline SP - 614 EP - 8 JF - Hormones and behavior JO - Horm Behav VL - 58 IS - 4 N2 - Oxytocin plays an important role in monogamous pairbonded female voles, but not in polygamous voles. Here we examined a socially monogamous cooperatively breeding primate where both sexes share in parental care and territory defense for within species variation in behavior and female and male oxytocin levels in 14 pairs of cotton-top tamarins (Saguinus oedipus). In order to obtain a stable chronic assessment of hormones and behavior, we observed behavior and collected urinary hormonal samples across the tamarins' 3-week ovulatory cycle. We found similar levels of urinary oxytocin in both sexes. However, basal urinary oxytocin levels varied 10-fold across pairs and pair-mates displayed similar oxytocin levels. Affiliative behavior (contact, grooming, sex) also varied greatly across the sample and explained more than half the variance in pair oxytocin levels. The variables accounting for variation in oxytocin levels differed by sex. Mutual contact and grooming explained most of the variance in female oxytocin levels, whereas sexual behavior explained most of the variance in male oxytocin levels. The initiation of contact by males and solicitation of sex by females were related to increased levels of oxytocin in both. This study demonstrates within-species variation in oxytocin that is directly related to levels of affiliative and sexual behavior. However, different behavioral mechanisms influence oxytocin levels in males and females and a strong pair relationship (as indexed by high levels of oxytocin) may require the activation of appropriate mechanisms for both sexes. SN - 1095-6867 UR - https://www.unboundmedicine.com/medline/citation/20600045/full_citation/Variation_in_Oxytocin_is_Related_to_Variation_in_Affiliative_Behavior_in_Monogamous_Pairbonded_Tamarins_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0018-506X(10)00174-1 ER -