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Cape Town fights alien trees threatening its water supply, biodiversity

WATCH: Thousands of hectares of invasive pine trees are being painstakingly removed to ease Cape Town’s climate-induced water shortages

10/24/2021 9:45:00 PM

WATCH: Thousands of hectares of invasive pine trees are being painstakingly removed to ease Cape Town’s climate-induced water shortages

In South Afr ica's Franschhoek mountains a helicopter drops off abseilers to cut down invasive pine trees that are choking off water supplies to millions of Cape Town residents already facing climate change-induced shortages.

Using hand saws to cut saplings while dangling over craggy cliffs, the team is targeting infestations of alien tree species, mainly pine but also Australian acacia and eucalyptus, that carpet swathes of mountainside in dark green foliage."We can't eradicate the pines, but we've got to manage and control them because the scale is too big. It's a massive problem," said Louise Stafford, South Africa's programme director at The Nature Conservancy, an NGO leading the process.

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The control of the pines was fast-tracked in 2018, when Cape Town narrowly avoided having its taps run dry during a drought dubbed "Day Zero".Pine trees, first introduced from Europe during the 17th century, are now the backbone of South Africa's commercial forestry industry. But their small seeds are easily dispersed by the wind and, with no natural enemies, they can spread rapidly from plantations to protected nature reserves, scientists said.

PLANTS, ANIMALS UNDER THREAT1/10An invasive pine sapling sits amongst indigenous vegetation above Caledon near Cape Town, South Africa, October 12, 2021. REUTERS/Mike HutchingsRead MoreThe alien trees also threaten native animals and plants in the Cape Floral Kingdom, where 70% of the plants, like the famous fynbos range of plants that are found nowhere else on the planet. A single pine tree consumes at least 20% more water than the fynbos. headtopics.com

The animals under threat include the Rough Moss frog, which was discovered in 2008, about 100km east of Cape Town on the slopes of Caledon's Klein Swartberg mountains, which are drained by three vital rivers."Out of the five sites we are monitoring, three no longer have any (Rough Moss) frogs. If we do not remove this carpet of pine trees there is no doubt the frogs will become extinct," John Measey, a zoologist at Stellenbosch University's Centre for Invasion Biology, said.

Removing dense pine thickets is a huge task, but necessary."We are eating this elephant piece by piece," Lambert Fick, chairman of the Klein Swartberg Nature Conservancy, said, as workers prepared aheadof a controlled fire to clear the area -- a practice that some conservationists regard as risky.

Introducing moths, weevils or mites is also being considered to combat the trees, Andrew Turner, a restoration ecologist at government agency CapeNature, said.He added, "It is not a silver bullet ... (they) cannot get rid of existing infestations, but rather stop it spreading further".

Editing by Tim Cocks and Jane MerrimanOur Standards:More from ReutersSign up for our newsletterSubscribe for our daily curated newsletter to receive the latest exclusive Reuters coverage delivered to your inbox. Read more: Reuters Top News »

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