Navigation Links
Female-led infanticide in wild chimpanzees

Researchers observing wild chimpanzees in Uganda have discovered repeated instances of a mysterious and poorly understood behavior: female-led infanticide. The findings, reported by Simon Townsend, Katie Slocombe and colleagues of the University of St. Andrews, Scotland, and the Budongo Forest Project, Uganda, appear in the May 15th issue of the journal Current Biology, published by Cell Press.

Infanticide is known to occur in many primate species, but is generally thought of as a male trait. An exception in the realm of chimpanzee behavior was famously noted in the 1970s by Jane Goodall in her observations of Passion and Pom, a mother-daughter duo who cooperated in the killing and cannibalization of at least two infant offspring of other females. In the absence of significant additional evidence for such behavior among female chimpanzees, speculation had been that female-led infanticide represented pathological behavior, or was a means of obtaining nutritional advantage under some circumstances.

As the result of new field work involving the Sonso chimpanzee community in Budongo Forest in Uganda, the St. Andrews researchers now report instances of three female-led infanticidal attacks. Alerted to the killings by sounds of chimpanzee screams, the researchers directly observed one infanticide, and found strong circumstantial evidence for two others. Evidence suggested that in two of the cases, the killings were perpetrated by groups of resident females against "stranger" females from outside the resident group. Infants were taken from the mothers, who were injured in at least two of the attacks; in at least one case, adult males in the area exhibited displaying behavior, with one old male unsuccessfully attempting to separate the females.

The authors point out that these new observations indicate that such female-led infanticides are neither the result of isolated, pathological behaviors nor the by-product of male aggression, but instead app ear to represent part of the female behavior repertoire in chimpanzees.

What drives the behavior is not yet clear, but may stem from demographic shifts that alter sex ratios and put increased pressure on females competing for foraging areas. In their report, the authors note that the Sonso community had experienced a significant population increase in the ten years prior to the infanticide observations (42 individuals in 1996 to 75 in 2006), and that there had been an influx of at least 13 females with dependent offspring since 2001. The population changes resulted in a highly skewed male:female sex ratio of 1:3, with relatively few males available to increase the home range.

According to the authors, the new findings indicate that although low-level aggression between female chimpanzees is more commonly seen, the observed instances of infanticide indicate that deadly aggression is not a gender-specific trait in this species.
'"/>

Source:Cell Press


Related biology news :

1. Poaching, logging, and outbreaks of Ebola threaten central African gorillas and chimpanzees
2. UAB researchers confirm HIV-1 originated in wild chimpanzees
3. Gene study shows three distinct groups of chimpanzees
4. Ebola outbreaks killing thousands of gorillas and chimpanzees

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/4/2019)... ... April 03, 2019 , ... ... therapies performed at its nationwide Centers of Excellence. R3 wants patients to feel ... provider. , To protect patients from Centers that use inferior regenerative biologics, protocols ...
(Date:3/29/2019)... ... March 28, 2019 , ... In the development of biosimilars, the ... path for this task. Despite this uncertainty, several manufacturers have been successful and numerous ... first part of this webinar, learn how analytical similarity is achieved in biosimilars based ...
(Date:3/29/2019)... (PRWEB) , ... March 29, 2019 , ... ... Cell (hMSC) biomanufacturing systems, will attend the Society for Biomaterials Annual Meeting & ... us the opportunity to connect with academic, healthcare, governmental and business professionals in ...
Breaking Biology News(10 mins):
(Date:4/4/2019)... ... April 03, 2019 , ... LeadingBiotech, an ... and dialogue, today announces its Boston CEO conference to be held May 28-29, ... challenges and opportunities with high-level panels and discussions from past, present and future ...
(Date:3/27/2019)... ... March 26, 2019 , ... A leader in the field ... to veterinarians across the United States and Canada since 2004. The primary indications ... tissue injuries in the dog, cat, and horse. Recently, VetStem teamed up ...
(Date:3/27/2019)... ... , ... Lachman is sponsoring the event on April 1-4, where they will ... executive team on site will be available to discuss strategies and tactics to support ... year. , Executives from Lachman participating at this year’s conference include Fran Zipp, President ...
(Date:3/23/2019)... ... March 22, 2019 , ... ... LenS3 Multi-Angle Light Scattering (MALS) detector , offering a revolutionary approach for the ... polysaccharides, proteins, and biopolymers. A novel optical design, a unique cell-block assembly, and ...
Breaking Biology Technology: