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Related Experiment Video

Updated: Nov 11, 2025

A Common Marmoset Model of Mother-Infant Intervention for Breastfeeding Disorders in the Presence of Paternal Inhibition and Maternal Neglect

A Common Marmoset Model of Mother-Infant Intervention for Breastfeeding Disorders in the Presence of Paternal Inhibition and Maternal Neglect

Published on: September 22, 2023

Social groups buffer maternal loss in mountain gorillas.

Robin E Morrison^1,2, Winnie Eckardt¹, Fernando Colchero^3,4

¹Dian Fossey Gorilla Fund, Musanze, Rwanda.

|March 23, 2021

Summary

This summary is machine-generated.

Maternal loss in mountain gorillas did not reduce fitness. Social bonds, especially with males and peers, strengthened after mothers died, buffering negative effects seen in other mammals.

Keywords:

care ecology evolutionary biology gorilla beringei beringei maternal loss orphan primate social relationships

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Using a Murine Model of Psychosocial Stress in Pregnancy as a Translationally Relevant Paradigm for Psychiatric Disorders in Mothers and Infants

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Published on: June 13, 2021

Area of Science:

Primatology
Behavioral Ecology
Social Mammal Studies

Background:

Maternal care is vital for mammalian offspring survival and development.
In many social mammals, maternal loss later in life leads to significant fitness costs and social adversity.
Some human populations demonstrate resilience to maternal loss through social support networks.

Purpose of the Study:

To investigate the fitness consequences of maternal loss in mountain gorillas.
To examine how social relationships change following maternal loss in this species.
To determine if social buffering mechanisms, similar to those in humans, exist in mountain gorillas.

Main Methods:

Longitudinal study of a mountain gorilla population.
Analysis of survival rates, reproductive success (age at first birth, offspring survival), and social network dynamics.
Social network analysis to quantify changes in relationships post-maternal loss.

Main Results:

No significant fitness costs were observed in gorillas experiencing maternal loss (survival, age at first birth, offspring survival).
Social network analysis indicated strengthened relationships with other group members, particularly dominant males and age-peers, after maternal loss.
These findings contrast with the typical negative impacts of maternal loss in social mammals.

Conclusions:

Mountain gorillas exhibit resilience to maternal loss, unlike most social mammals.
Strong social bonds within cohesive gorilla groups may buffer the negative fitness consequences of maternal loss.
This buffering effect, observed in both gorillas and some human populations, breaks the direct link between maternal loss, social adversity, and reduced fitness.