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Drought-threatened Amazon dolphins studied for environment modification effect

A team of biologists, vets and anglers momentarily recorded uncommon freshwater dolphins in the Amazon this week to study their health in hopes of avoiding a repeat of the deaths of numerous the mammals last year due to a severe drought.

The dolphins were brought ashore for blood tests and other examinations and returned to Lake Tefé in the Amazon basin as quickly as the researchers had actually finished their work, which included placing a microchip to monitor their habits through satellite.

Anglers took care not to hurt an adult female dolphin during capture and kept her near to her offspring to avoid worrying the animals.

She relaxed and we might do all the tests. She appeared in good health, said task leader Miriam Marmontel of the Mamirauá Institute of Sustainable Advancement, which prepared the expedition to briefly catch up to 20 dolphins.

The work included eliminating a sample for a biopsy to see whether there were pollutants in her blubber, and the placement of the microchip on her back, which will enable scientists to follow her movements and the depths she swims at, and even figure out water temperatures remotely.

In a grim fallout from the longest drought in the Amazon rainforest's taped history last year, caused in part by environment change, the carcasses of more than 200 river dolphins were discovered drifting on Lake Tefé, which is formed by a tributary of the Amazon River.

Low river levels during the drought heated the water to temperature levels that were intolerable for the dolphins, researchers state. Countless fish likewise died in Amazon waterways due to a. lack of oxygen in the water.

PINK DOLPHINS

The Amazon river dolphins, a lot of a striking pink color,. are a distinct freshwater types found only in the rivers of. South America and are one of a handful of freshwater dolphin. species left in the world. Sluggish reproductive cycles make their. populations specifically susceptible to hazards.

Marmontel stated they intend to establish what triggered last. year's deaths before this season's drought set in as the Amazon. dry season starts, so that scientists can respond faster.

We intend to get more information about the health of the dolphins. at a time when water levels start to go down and temperature levels. start to rise, so we can recognize the modifications and understand whether. they are due to greater temperatures or a contaminant or pollutant in. the water, she told Reuters.

The project was supported by the National Marine Mammal. Foundation of California, whose scientists helped carry out. ultrasound examinations on the dolphins.

Marmontel stated the majority of the dolphins that perished last year. were in Lake Tefé, a 45-km-wide (27-mile) expanse of water where. the dolphins like to be located, just off the Solimoes River.

The lake's waters reached 40.9 degrees Celsius (105.62. Fahrenheit) throughout the 2023 dry spell, more than 10 degrees greater. than the average for that time of the year. The water is now at. 30 degrees Celsius (86 degrees Fahrenheit), said Ayan. Fleischmann, a geosciences scientist at the Mamirauá Institute.

Ecological activists have blamed the uncommon conditions. on climate change, that makes droughts and heat waves more. likely and severe. The function of worldwide warming in last year's. Amazon dry spell is unclear, with other aspects such as the El. Niño weather phenomenon likewise viewed as an element.

(source: Reuters)