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Home Wildlife in Africa

Botswana: Cyanobacteria is the cause of elephant deaths

Discover AfricabyDiscover Africa
September 27, 2020
in Wildlife in Africa, Travel News
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Cyanobacteria is the cause of elephant deaths
Toxins made by microscopic algae in water caused the previously unexplained deaths of hundreds of elephants in Botswana, wildlife officials say.

Botswana is home to a third of Africa’s declining elephant population.

The alarm was raised when elephant carcasses were spotted in the country’s Okavango Delta between May and June.

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Officials say a total of 330 elephants are now known to have died from ingesting cyanobacteria. Poaching has been ruled out as a cause of death.

Cyanobacteria are toxic bacteria which can occur naturally in standing water and sometimes grow into large blooms known as blue-green algae.

Scientists warn that climate change may be making these incidents – known as toxic blooms – more likely, because they favour warm water.

Warning: Some people may find an image below upsetting

The findings follow months of tests in specialist laboratories in South Africa, Canada, Zimbabwe and the US.

Many of the dead elephants were found near watering holes, but until now the wildlife authorities had doubted that the bacteria were to blame because the blooms appear on the edges of ponds and elephants tend to drink from the middle.

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“Our latest tests have detected cyanobacterial neurotoxins to be the cause of deaths. These are bacteria found in water,” the Department of Wildlife and National Parks’ Principal Veterinary Officer Mmadi Reuben told a press conference on Monday.

The deaths “stopped towards the end of June 2020, coinciding with the drying of [water] pans”, AFP quotes him as saying.

Reports in June noted that tusks had not been removed, meaning poaching was not seen as a likely explanation.

Anthrax poisoning has also been ruled out, according to senior wildlife department official Cyril Taolo.

But questions still remain about the deaths, Mr. Reuben told reporters.

“We have many questions still to be answered such as why the elephants only and why that area only. We have a number of hypotheses we are investigating.”

Hundreds of carcasses were spotted with the help of aerial surveys earlier this year.

Dr Niall McCann, of the UK-based charity National Park Rescue, previously told the BBC that local conservationists first alerted the government in early May, after they undertook a flight over the delta.

“They spotted 169 in a three-hour flight,” he said. “To be able to see and count that many in a three-hour flight was extraordinary.”

Twenty-five elephants recently died in a group in neighboring Zimbabwe. Test samples have been sent to the UK for analysis.

So What is Cyanobacteria?
  • Cyanobacteria, also known as blue-green algae, is found worldwide especially in calm, nutrient-rich waters
  • Some species of cyanobacteria produce toxins that affect animals and humans
  • People may be exposed to cyanobacterial toxins by drinking or bathing in contaminated water
  • Symptoms include skin irritation, stomach cramps, vomiting, nausea, diarrhea, fever, sore throat, headache
  • Animals, birds, and fish can also be poisoned by high levels of toxin-producing cyanobacteria.

Source: WHO

News by BBC News

 

Cyanobacteria is the cause of elephant deaths
Cyanobacteria is the cause of elephant deaths
Cyanobacteria is the cause of elephant deaths
Cyanobacteria is the cause of elephant deaths


 

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