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FLORA AND FAUNA
Sierra Leone's chimpanzees pay price of human expansion
By Saidu Bah
Freetown (AFP) Oct 30, 2018

Nature under assault: key indicators
Paris (AFP) Oct 30, 2018 - The World Wildlife Fund and partners have tracked population changes in Earth's animal species for decades. News from the latest "Living Planet" report, released Tuesday, is more grim than ever.

Here are key findings:

- Populations crashing -

From 1970 to 2014, the number of animals with a backbone -- birds, reptiles, amphibians, mammals and fish -- plummeted across the globe, on average, by about 60 percent.

For freshwater vertebrates, losses topped 80 percent. Geographically, South and Central America have been hit hardest, with 89 percent less wildlife in 2014 than in 1970.

The WWF Living Planet Index tracks more than 4,000 species spread across nearly 17,000 populations.

- Species disappearing -

The index of extinction risk for five major groups -- birds, mammals, amphibians, corals and an ancient family of plants called cycads -- shows an accelerating slide towards oblivion.

Depending on which categories are included, the current rate at which species are going extinct is 100 to 1,000 times greater than only a few centuries ago, when human activity began to alter the planet's biology and chemistry in earnest.

By definition, this means that Earth has entered a mass extinction event, only the sixth in half-a-billion years.

- Boundaries breached -

In 2009, scientists weighed the impact of humanity's expanding appetites on nine processes -- known as Earth systems -- within nature. Each has a critical threshold, the upper limit of a "safe operating space" for our species.

The do-not-cross red line for climate change, for example, is global warming of 1.5 degrees Celsius (2.7 degrees Fahrenheit), according to a new UN report.

So far, we have clearly breached two of these so-called planetary boundaries: species loss, and imbalances in Earth's natural cycles of nitrogen and phosphorous (mainly due to fertiliser use).

For two others, climate and land degradation, we have one foot in the red zone. Ocean acidification and freshwater supply are not far behind. As for new chemical pollutants such as endocrine disruptors, heavy metals, and plastics, we simply don't know yet how much is too much.

More generally, the marginal capacity of Earth's ecosystems to renew themselves has been far outstripped by humanity's ecological footprint, which has nearly tripled in 50 years.

- Forests shrinking -

Nearly 20 percent of the Amazon rainforest, the world's largest, has disappeared in five decades. Tropical deforestation continues unabated, mainly to make way for soy beans, palm oil and cattle.

Globally, between 2000 and 2014, the world lost 920,000 square kilometres of intact or "minimally disturbed" forest, an area roughly the size of Pakistan or France and Germany combined. Satellite data shows the pace of that degradation picked up by 20 percent from 2014 to 2016, compared with the previous 15 years.

- Oceans depleted -

Since 1950, our species has extracted six billion tonnes of fish, crustaceans, clams, squids and other edible sea creatures. Despite the deployment of increasingly sophisticated fishing technologies, global catches -- 80 percent by industrial fleets -- peaked in 1996 and have been declining since.

Climate change and pollution have killed off half of the world's shallow water coral reefs, which support more than a quarter of marine life. Even if humanity manages to cap global warming at 1.5C -- which many scientists doubt is possible -- coral mortality will likely be 70 to 90 percent.

Coastal mangrove forests, which protect against storm surges made worse by rising seas, have also declined by up to half over the last 50 years.

They have their hands full at the Tacugama Chimpanzee Sanctuary, where record numbers of orphaned chimps are being delivered to their care, victims of the relentless expansion of human activity.

Poachers hunt them for their meat, farmers shoot them to protect their crops and a lack of political will means more and more of their habitat is being surrendered to urban development and forestry.

Founder of the sanctuary Bala Amarasekaran does not mince his words.

"Over the past 10 years, the environment has suffered much depletion as a result of widespread construction of houses, logging and mining with the approval of corrupt politicians and lands ministry officials," he said.

Several species of wildlife around the forest, he added, had been wiped out.

The chimps' plight echoes the core message of the WWF's new Living Planet report, released Tuesday: that the devastation of the planet's wildlife is mostly down to "runaway human consumption".

Over the past three months, the Sierra Leone sanctuary has received seven orphaned chimps, a record number. But those figures only hint at the true scale of the slaughter, said Amarasekaran.

They calculated that for every chimp they received, up to 10 others could have been killed. Over the past three or four months then, between 70 and 100 chimpanzees could have perished.

- 'Sometimes they even cry for me' -

"Most chimps that arrive at the sanctuary are less than five years old and would still be suckling milk from their mothers," said Mama Posseh Kamara, who acts as surrogate mother to the new arrivals at the sanctuary.

"Many have lost their mothers to bush meat hunters, abandoned or illegally sold as pets," she explained.

As she spoke, she fed milk to one of her new charges, a four-month-old baby chimp, as several others climbed over her back and head.

"I have been doing this job for the past 14 years," she said. "They usually see me as their mother because I feed and clean them daily. Sometimes they even cry for me."

While they do what they can to protect the animals' habitat, their efforts are often frustrated by the actions of local officials, said Amarasekaran.

"We planted over 4,000 trees around the National Park area in Freetown," he said.

"But city planners gave it away for the construction of dwelling houses, due to lawlessness, greed and corruption.

"Government should stop all human activities around our forests to protect biodiversity. If we continue to deplete our environment there will be nothing left for the future."

- 'Obsolete' laws -

Western chimpanzees are the only critically endangered chimp subspecies. They have already been wiped out in Burkina Faso, Benin, Gambia -- and possibly Togo too.

According to The American Journal of Primatology, their population plunged more than 80 percent between 1990 and 2014. And Sierra Leone is home to about 10 percent of an estimated 55,000 still living wild.

And the loss of their natural habitat is only making the situation worse.

"Sierra Leone is losing a lot of forest cover, due to human activities," the Food and Agriculture Organization's (FAO) local representative Nyabenyi Tito Tipo told AFP during her visit to the sanctuary.

"Our forests need to be protected, regenerated and not depleted," she added.

But for Papanie Bai Sesay, biodiversity officer at the Conservation Society of Sierra Leone, there are two problems with Sierra Leone's current conservation laws.

"We have obsolete wildlife laws, which date as far back as 1978," he explained.

But the other problem was more fundamental, he added.

"Our current forest conservation laws and policies are also not enforced by authorities."

- Battling deforestation -

Beran Forster, an assistant director at Sierra Leone's Environmental Protection Agency, acknowledges the scale of the problem.

"The major impact on the environment in Sierra Leone is human expansion into wildlife areas, bush fire to clear lands and hunting wild animals for bush meat," he said.

"Deforestation through unsustainable logging practices for exporting of logs is the worst situation the environment is faced with," he added.

In response, they were trying to educate local people on the effects of deforestation and replant across the country.

International partners, such as the US Embassy in Freetown are also helping.

They are financing an agricultural project to improve crop diversity in a sustainable manner, engaging the local villages near the Tacugama Sanctuary.

But change needs to come soon, warned Amarasekaran.

The Freetown National Park boasts a high level of biodiversity: large numbers of species of both plant and animal life, including snakes, birds, butterflies, chimps and other monkeys, he said.

But, he added: "If we continue to deplete our environment there will be nothing left for the future."


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FLORA AND FAUNA
Tortoise evolution: How did they become so big?
Halle, Germany (SPX) Oct 24, 2018
Tortoises are a group of terrestrial turtles globally distributed in habitats ranging from deserts to forests and include species such as the Greek and the Galapagos tortoise. Some species evolved large body sizes with a shell length exceeding 1 metre whereas others are no larger than 6-8 centimetres. Despite a particular interest from naturalists ever since the times of Darwin, the evolution of gigantism in tortoises remains enigmatic. The fact that all living giant tortoises are insular may sugg ... read more

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