EMIGRATION & MATURATION IN HOWLING MONKEYS

移民

• 批准号: 6247307
• 负责人: MARGARET R CLARKE
• 金额: $ 14.5万
• 依托单位: TULANE UNIVERSITY OF LOUISIANA
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-09 至 1998-09-29
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6247307
• 关键词: Mammalia; Primates; behavioral /social science research tag; growth factor; hormones; psychology

Juvenile emigration patterns are documented in mantled howling monkeys but the specific impetus is unknown. To determine if emigration is hormonally mediated, 193 fecal samples were collected from 25 juveniles in 5 social groups on Hacienda La Pacifica during June-August, 1993-1995. Samples were analyzed for estradiol, progesterone, and testosterone concentration using methods developed by Risler et al. (1987). Mean concentrations for each individual for each year were determined, and were compared by age (1-1.9 yrs; 2-2.9 yrs.; 3-3.9 yrs), by sex (male, female), and by emigration outcome (remained, emigrated during year, emigrated during study). All one-year olds remained in natal groups, with no differences in hormone concentrations between males and females. Two-year old females that remained in groups had higher mean concentrations of all hormones than females that emigrated. This pattern reversed at three years of age Females remaining in groups had lower mean hormone concentrations than those emigrating. For two- and three-year old males, those that remained in groups had lower concentrations than those that emigrated, although it was more marked in the older males. In contrast, for two-and three-year old males being forced out of the group during the study, all hormonal values were very low, suggesting a physiological response to social uncertainty. These hormonal data support the observational data previously reported for juvenile emigration.

青少年的迁徙模式记录在被遮蔽的嚎叫中