Models for lineal effects in rhesus group fissions

Area of Science:

• Primatology
• Population Genetics
• Molecular Anthropology

Background:

• Understanding gene flow and genetic structure in social animal groups is crucial for evolutionary studies.
• Rhesus monkey colonies provide valuable models for observing social dynamics and genetic consequences.

Purpose of the Study:

• To analyze gene distributions in daughter groups formed by rhesus monkey colony fissions.
• To compare observed genetic differentiation with predictions from random and lineal fissioning models.

Main Methods:

• Electrophoretic analysis of three genetic marker systems (Tf, 6PGD, CA II).
• Analysis of gene distributions in three specific rhesus monkey group fissions (F/M, F/O, J/N).
• Calculation and comparison of fixation index (FST) values against theoretical models.

Main Results:

• Significant variations in FST values were observed across different genetic markers and fissions.
• Observed genetic differentiation generally exceeded predictions from simple random fissioning models.
• Average FST values closely matched predictions from lineal fissioning models, including simulations incorporating matrilineal allele propagation.

Conclusions:

• Rhesus monkey group fissions result in genetic differentiation patterns that deviate from simple random processes.
• Lineal fissioning models, especially those accounting for matrilineal inheritance, provide a better framework for understanding observed gene distributions.
• The study highlights the influence of social structure and matrilineal dynamics on the genetic makeup of primate populations.