Soaring water temperatures suspected in death of 100 pink dolphins

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Sao Paulo: More than 100 dolphins have died in the Brazilian Amazon rainforest in the past week as the region grapples with a severe drought, and many more could die soon if water temperatures remain high, experts say.

The Mamiraua Institute, a research group of Brazil’s Ministry of Science, Technology and Innovation, said two more dead dolphins were found on Tuesday (AEDT) in the region around Tefe Lake, which is key for mammals and fish in the area.

An Amazon pink dolphin, or boto, near the city of Novo Airão, Amazonas, Brazil.Credit: iStock

Video provided by the institute showed vultures picking at the dolphin carcasses beached on the lakeside. Thousands of fish have also died, local media reported.

Experts believe high water temperatures are the most likely cause of the deaths in the lakes in the region. Temperatures since last week have exceeded 38 degrees Celsius in the Tefe Lake region.

The Brazilian government’s Chico Mendes Institute for Biodiversity Conservation, which manages conservation areas, said last week it had sent teams of veterinarians and aquatic mammal experts to investigate the deaths.

There had been some 1400 river dolphins in Tefe Lake, said Miriam Marmontel, a researcher from the Mamiraua Institute.

“In one week we have already lost around 120 animals between the two of them, which could represent 5 to 10 per cent of the population,” said Marmontel.

Workers have recovered carcasses of dolphins since in a region where dry rivers have impacted impoverished riverside communities and stuck their boats in the sand. Amazonas Governor Wilson Lima declared a state of emergency on Friday due to the drought.

Nicson Marreira, mayor of Tefe, a city of 60,000 residents, said his government was unable to deliver food directly to some isolated communities because the rivers are dry.

Ayan Fleischmann, the geospatial coordinator at the Mamiraua Institute, said the drought has had a major impact on the riverside communities in the Amazon region.

A rare pink dolphin “boto cor de rosa” swimming on the Negro River in the Brazilian Amazon. Credit: iStock

“Many communities are becoming isolated, without access to good quality water, without access to the river, which is their main means of transportation,” he said.

Fleischmann said water temperatures rose from 32 degrees on Friday to almost 38 on Sunday alone. He said they were still determining the cause of the dolphin deaths but that the high temperature remained the main candidate.


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