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The loss of elephants accelerates climate change.
- Elephants help keep the central African forests they live in healthy.
- Without elephants, the forests see a striking reduction in their carbon dioxide-storage capacity.
- Study calls elephants "natural forest managers."
The study<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMDY0OTYxNC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzOTAyODIzNX0.i2SQEyRI8PiGgfyYGbR50VwopL4t1eMDStVlWtrCIk0/img.jpg?width=1245&coordinates=49%2C27%2C83%2C196&height=700" id="2f4ef" class="rm-shortcode" data-rm-shortcode-id="1a39f6d0d0746c34109887d26ed1c6d6" data-rm-shortcode-name="rebelmouse-image" />
Image source: Siegfried.modola/Shutterstock<p> Led by ecologist <a href="http://berzaghi.com" target="_blank">Fabio Berzaghi</a> of <a href="https://www.lsce.ipsl.fr" target="_blank">Climate and Environmental Sciences</a> in France, researchers collected field measurements of forests in the Congo basin, comparing the tree densities and composition of areas in which elephants are still present, and areas in which they no longer live. It's estimated that the animals' overall population has been reduced 10 percent from historical levels. </p><p>What the analysis reveals is that forests in central Africa no longer home to elephants are characterized by a reduction in larger trees, and critically, fewer hard-wood trees. These trees have a more robust CO<sub>2</sub> storage capacity than soft-wood trees. </p><p> The trick to working out the impact of losing elephants is that their influence on forest ecosystems plays out over a longer term — think 100 years — than the period for which data is available. To address this, the researchers developed computer simulations that exposed changes in the way different types of trees compete for nutrient, water, and light with and without elephants. </p><p> The researchers concluded that without the creatures, some three billion tons of carbon would no longer be captured by the forests — that amount is roughly equal to France's total carbon emissions for 27 years. That's about a 7 percent reduction in the forests' ability to absorb the greenhouse gas. </p><p>Co-author <a href="https://www.cdoughty.org" target="_blank">Chris Doughty</a> sums it up <a href="https://www.lsce.ipsl.fr/Phocea/Vie_des_labos/Fait_marquant/index.php?id_news=6089" target="_blank">this way</a>: "Our simulations suggest that if elephant loss continues unabated, central African forests may release the equivalent of multiple years of fossil fuel CO<sub>2</sub> emissions from most countries, thus potentially accelerating climate change. Therefore, their loss could have a drastic impact both locally and on global climate." </p>
How elephants change forests<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMDY0OTY4MC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYyNDgyNDIyMH0.ANVRscyUB9npgtdeWrmkDCRB83MRPY_X4x7lfPk2r6o/img.jpg?width=980" id="ec0f2" class="rm-shortcode" data-rm-shortcode-id="24ecce96691df2992659f2cbd94464ee" data-rm-shortcode-name="rebelmouse-image" />
Image source: David JC / Shutterstock<p> Experts already suspect this link, but the new study for the first time comprehensively quantifies it. Previous guesses about <em>how</em> elephants have such a striking effect on their habitats' biomass have focussed on seed dispersal via defecation, generally moving things around, and stepping on and crushing small trees. All of these things seem to be true. Berzaghi says, "Forest elephants are natural forest-managers that thin forests by 'pruning' or removing small trees which increases the growth of large trees and the production of wood."</p>
A obvious solution<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMDY0OTYyOC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYwMDcxNDMwOH0.uLdjcktz4tJx-XVB1bjfjWRNhBnAQGFWpMUdxnh0yAw/img.jpg?width=980" id="f6ac7" class="rm-shortcode" data-rm-shortcode-id="7bc8c77c8d52ee9b0e9468d65eb40283" data-rm-shortcode-name="rebelmouse-image" />
Image source: GUDKOV ANDREY / Shutterstock<p>Stop killing elephants.</p><p>"Our study shows that even at high population densities, forest elephants continue to improve the carbon storage potential of central African forests, so there is no ecological concern for their comeback," says Berzaghi. Increasing their population size in these forests carries with it no discernible risk. </p><p>Their resurgence would also confer benefits beyond better carbon storage. Study co-author <a href="https://www.slu.edu/arts-and-sciences/biology/faculty/blake-stephen.php" target="_blank">Stephen Blake</a> notes that "Forest elephants are the gardeners and guardians of biodiversity in the Congo Basin." Their seed dispersal alone, according to the study authors, contributes to the germination of over 100 tree species that provide habitats for birds, primates, and insects.</p>
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