Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata).

Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Research Abstract Details 

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Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Abstract Text:

Margaret R Clarke,Evan L Zucker,Randall T Ford,Richard M Harrison,

Behavioral observations on juvenile mantled howlers are limited by visually undifferentiated genitalia; however, animals can be sexed when they are very young or if they are captured. Behavioral data and fecal samples from juveniles during month-long field studies from 1993 to 1995 were analyzed to determine whether there are developmental differences in behavior or hormone concentrations that can be used to differentiate males from females. The subjects were juveniles of known sex and age from five different social groups on Hacienda La Pacifica, Costa Rica. Based on 749.8 hr of focal-animal sampling, there were no sex differences in daily activity patterns. There were no sex differences in proximity to mothers and other group members, and age differences reflected howler life-history patterns. There were no differences in estradiol or testosterone concentration by age or sex. Juvenile monomorphy thus extends beyond morphology to behavioral and hormonal similarity as well. Most juveniles are forced out of their natal groups and remain solitary until they join new groups by supplanting all same-sex adult group members. Monomorphy may allow them to spend more time in natal groups, and thus both reduce the solitary period and allow the juveniles to improve social skills needed for later immigration. While this strategy may benefit juvenile howlers, it remains a problem for those who wish to study juvenile sex differences from a distance.

Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Publishing Authors By Initials

MR Clarke,EL Zucker,RT Ford,RM Harrison,

For similar diagnosis: laboratory techniques and procedures: sex determination (analysis) research abstracts see: diagnosis: laboratory techniques and procedures: sex determination (analysis) research

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Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: American journal of primatology

VOLUME: 69

Page Numbers: 477-84

Journal Abbreviation: Am. J. Primatol.

ISSN: 0275-2565

DAY: 3

MONTH: Apr

YEAR: 2007

Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Information

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LANGUAGE: eng

NlmUniqueID: 8108949

Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Keywords Mesh Terms:

KEYWORDS: Sex Determination (Analysis)

MESH TERMS: methods

Chemical & Substance for Abstract: Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata). Information

Substance Name: Gonadal Hormones

Registry Number: 0

Grant and Affiliation Information for Behavior and endocrine concentrations do not distinguish sex in monomorphic juvenile howlers (Alouatta palliata).

AFFILIATION: Tulane National Primate Research Center, Covington, Louisiana, USA. mrclarke@duke.edu

Country: United States

AGENCY: United States NCRR

GRANT: RR00164

ACRONYM: RR

MEDLINETA: Am J Primatol

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