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June 28, 2018

Poaching alters orphan elephant's social lives (Image 2)

A young matriarch (right) leads a group of her own calves, followed by a group of orphaned calves, in Buffalo Springs National Reserve, Kenya. [See related image Here.]

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It is well known that elephants are very social animals that live in social structures with a level of complexity that rivals that of human societies. With that in mind, researchers questioned what impact poaching, which targets older individuals, may have on orphan animals’ social functioning.

A recent study led by researchers from Colorado State University (CSU) analyzed the social interaction patterns of juvenile female elephants and found that orphans have less access to mature, dominant individuals than non-orphaned elephants, whose primary social partners are their mothers and aunts.

The researchers found that social integration with the remaining adults in the population only compensates for the orphans loss of their mothers to some degree, at least during the initial years following their loss.

"Previous work in this and other elephant populations has shown that like other social species, elephants strengthen existing bonds if they lose important social partners," said Shifra Goldenberg, author of the published study and a postdoctoral researcher in CSU's Department of Fish, Wildlife, and Conservation Biology and with Save the Elephants, a nonprofit conservation organization in Kenya. "Our study suggests that despite this compensatory social behavior, orphans experience a social disadvantage compared to non-orphans."

"Access to older, dominant individuals is critical for juveniles, as mature individuals are knowledge repositories and have preferential access to resources," said co-author of the study George Wittemyer, an associate professor at CSU and chairman of the scientific board of Save the Elephants. "Losing this access may have long-term ramifications for orphans."

The study was conducted in the Samburu and Buffalo Springs national reserves in northern Kenya, the site of Save the Elephants' long-term elephant monitoring project. Over the last decade, the population has experienced increased ivory poaching and a severe drought, which left many young elephants without mothers and grandmothers.

This research was funded in part by a National Science Foundation Graduate Research Fellowship (grant DGE 13-21845).

Read more in the CSU news story Orphaned elephants' social lives substantially altered by poaching. Or read more about Shifra's elephant research on her website. (Date image taken: 2014; date originally posted to NSF Multimedia Gallery: June 28, 2018)

Credit: Shifra Goldenberg, Save the Elephants/Colorado State University

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