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Reintroduction of 500 sulcata tortoises reveals how natural tunnels can help rainwater enter the soil and recover degraded areas.
An unusual environmental recovery attempt drew attention at the edges of the Sahara, after years of failure in tree planting.
For a long time, seeds did not germinate, seedlings died early, and the hardened soil prevented rainwater from penetrating the earth.
So, instead of insisting solely on direct planting, researchers and conservationists bet on the reintroduction of 500 African spurred tortoises.
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The species, also known as the sulcata tortoise, is native to the Sahel and known for digging deep tunnels in arid and semi-arid regions.
Hard soil prevented vegetation advancement
The biggest challenge was not just the lack of trees, but the soil condition.
In very dry areas, the surface can form a hard, almost impermeable crust.
Thus, when rain falls, the water quickly runs off instead of entering the subsoil.
Without accumulated moisture, seeds do not awaken, and newly planted seedlings cannot develop deep roots.
Moreover, extreme heat, wind, loss of organic matter, and excessive grazing make recovery even more difficult.
Thus, planting trees in soil that does not retain water becomes a fragile attempt, lacking a foundation to sustain plant life.
Tortoise tunnels changed the landscape
The African spurred tortoise is among the largest land tortoises in the world.
It digs holes and tunnels to escape the intense heat during the day and temperature drops at night.
However, these tunnels do more than protect the animal.
They break the soil crust, create paths for rainwater, and form small moisture points.
With this, seeds carried by the wind or already present in the terrain find better conditions to germinate near these openings.
Small gardens emerge in the dry soil
By digging, the turtle turns the soil, mixes soil layers, and creates space for the circulation of water, air, and seeds.
Moreover, insects and microorganisms return to occupy areas that were once compacted and dry.
Consequently, the hard terrain begins to form small microenvironments favorable to life.
The result is not a forest suddenly appearing, but green patches scattered across the territory.
These areas indicate that the ecological cycle has resumed in places where almost nothing grew before.
Among the observed effects are:
• tunnels help rainwater penetrate the soil;
• loose soil facilitates seed germination;
• moisture remains longer near the entrances;
• insects and microorganisms return to the environment;
• vegetation begins to appear in visible patches.
Satellites recorded signs of life
According to the released report, five years after the release of the turtles, satellite images began to show green patches in areas previously dominated by sand and bare soil.
The change drew attention because it did not come from artificial irrigation, heavy machinery, or intensive planting.
On the contrary, it emerged from the natural behavior of a species that was already part of that environment.
Thus, the turtles began to act as ecosystem engineers.
They not only live in the territory but also modify the soil in a way that benefits plants, insects, small vertebrates, and microorganisms.
below: Eastern distribution – Credits: (Buhlmann et al. 2009; TTWG 2017)
Recovery does not turn the Sahara into a forest
Despite the visual impact, the reintroduction of tortoises does not mean that the Sahara will turn into a forest.
Recovery still depends on rain, protection against hunting, grazing control, soil management, and conservation of the species itself.
Even so, the case shows that restoring an environment does not always mean just planting more trees.
Sometimes, recovery begins when the right animals return to fulfill their natural role.
When the tortoise starts digging again, water finds its way, seeds get a chance, and the desert shows signs of life that even satellites can see.
Could the key to recovering degraded areas lie in the animals themselves that make the soil breathe?
Wow they can do that in Mars and the Moon too.