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Home → Environment → Animals

Elephant overhunting kills Tropical Forest as well in cascading effect

Tibi Puiu by Tibi Puiu
November 16, 2020
in Animals, Biology, News

We’re used to hearing how elephants are driven off by habitat lost, but never the other way around. Researchers at University of Florida claim that as overhunting has dramatically cut the number of elephants in the wild, but since these also disperse seeds, it seems like dominant tree species are also dying off. Along with the trees, other forest life is sure to follow in a dramatic cascading effect.

Elephants and trees, what’s the connection?

Elephant Tree by Shai Biran
Elephantree by Shai Biran

“The entire ecosystem is at risk,” said Trevor Caughlin, a UF postdoctoral student and National Science Foundation fellow. “My hope for this study is that it will provide a boost for those trying to curb overhunting and provide incentives to stop the wildlife trade.”

In a first of its kind study, Caughlin and colleagues  spent three years gathering tree data in Thailand. The researchers focused their study on trees that either grew in crowded environments around a parent tree or those that sprouted far away from the parent and whose seeds were broadcasted by animals; like elephants.

In Thailand, as in other neighboring countries, the elephant is revered as an important spiritual, cultural and national symbol. Despite this, elephants in Thailand today only number 2,000, a dramatic fall from the over 100,000 that could be found at the turn of the 20th century. Hunting and poaching are to blame, spurred by increase demand for ivory. The same fate seems to dwell on other animals such as tigers, monkeys and civet cats.

[AMAZING] The elephant bird: the largest bird to have ever lived

Using the data they gathered in Thailand, in conjunction with a dataset from the Thai Royal Forest Department that contained more than 15 years of data on trees, the team performed a simulation on UF’s supercomputer, HiPerGator. The long-term rundown shows that trees that grow from seeds transported over long distances by animals are sturdier and live longer.

“Previously, it’s been unclear what role seed dispersal plays in tree population dynamics,” Caughlin said. “A tree makes millions of seeds during its lifetime, and only one of those seeds needs to survive to replace the parent tree. On the surface, it doesn’t seem like seed dispersal would be that important for tree population. What we found with this study is that seed dispersal has an impact over the whole life of a tree.”

This was the first study that documented animal seed dispersal across a tree’s entire life cycle, from seeds, to seedlings to adult trees. Hopefully, the findings will provide an additional much needed incentive for local authorities to stiffen measures against overhunting and animal trading.

[RELATED] 100,000 elephants killed in Africa between 2010 and 2012, study finds

Richard Corlett, director of the Center for Integrative Conservation at the Xishuangbanna Tropical Botanical Gardens in Yunnan, China, underscored the study’s importance.

“This study fills a major gap in our understanding of how overhunting affects forest trees, particularly in tropical forests,” he said. “We knew hunting was bad, but we were not sure why it was bad, and therefore could not predict the long-term impacts. Now we know it is really, really bad and will get worse. The message that ‘guns kill trees too’ should help put overhunting at the top of the conservation agenda, where it deserves to be.”

Findings appeared in the journal Proceedings of the Royal Society B.

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