World News

Unprecedented Dolphin Deaths in the Brazilian Amazon



The Brazilian Amazon’s Lake Tefé has witnessed a harrowing sight in the past week – more than a hundred dead dolphins. Amid an exceptional drought and rising water temperatures, researchers are working to identify the main cause behind this disturbing occurrence.

Climate Anomalies and Potential Causes

  • The water temperatures in some parts of Lake Tefé have soared beyond 102 degrees Fahrenheit (39 degrees Celsius).
  • Such temperature levels and the unprecedented drought in the Amazon have been linked to the mass deaths, as per the Mamirauá Institute, a prominent research facility funded by the Brazilian Ministry of Science.
  • While several causes are being explored, including disease and sewage contamination, Ayan Fleischmann, a geoscience researcher at the Mamirauá Institute, mentions that water depth and temperature are definitely major factors behind mass mortality.
  • The dry season has further heightened the crisis, with the Amazon River, the world’s most extensive waterway, facing record-high temperatures, severely impacting various river species.

Dolphins: Indicators of River Health

  • Known as “boto” in the Amazon, these dolphins, characterized by their distinct pink or grey hue, primarily feed on piranhas.
  • Holding a semi-mythological significance in traditional culture, these creatures sometimes are believed to have transformed into humans. Their central role in Amazonian culture and ecosystem underlines their importance as a river’s health indicator.
  • The International Union for the Conservation of Nature recognizes botos as endangered. Their alarming decrease in number is a sign of the deteriorating health of the water bodies and the ecosystem they inhabit.

Broader Implications: Beyond Dolphins

  • The extreme weather, encompassing both severe flooding in southern parts and a drastic dry season in the north, can be attributed to human-induced climate change and the influence of El Niño.
  • The Amazon River’s level has been declining rapidly. In just two weeks, it decreased by 30cm daily. Presently, the river’s average depth in Manaus is down by 7.4 meters from its rainy season peak, a difference local biologists describe as “absurd”.
  • The drought’s far-reaching consequences extend to 59 municipalities in Amazonas State, with transportation and fishing activities being heavily obstructed due to reduced water levels.

Economic and Social Ramifications

  • Tefé, one of the worst-affected areas, has seen its channels dry up, with boat journeys taking an entire day in conditions that previously took just three hours.
  • Daniel Tregidgo, a British researcher living in the Amazonas state, recalls the days when seeing pink river dolphins was a regular occurrence. The current situation has been described as apocalyptic.
  • The drought has indirectly impacted the economy and livelihoods. For instance, food and fuel supplies are mainly transported by boat along the River Solimões from Manaus, which is currently impassable. This is expected to cause a surge in prices and increase food insecurity.
  • There’s an urgent plea for federal assistance, as water shortages are intensifying and broadening. Tefé’s community, consisting of 70,000 people, is one of 15 declared in an emergency state.

Conservationists Raise Alarm

Daphne Willems, from the conservation group WWF, voiced her concerns about the dolphin deaths and stressed the importance of the global declaration of river dolphins, which will be signed on 24 October. She emphasized that such a significant loss in a brief period is catastrophic, especially considering that the species is already endangered.

A Call to Action

The Amazon, often referred to as the “lungs of our planet”, plays a crucial role in regulating global climate and maintaining a balance in the ecosystem. The alarming incidents in Lake Tefé are not isolated events but stark indicators of larger environmental challenges.

Addressing Climate Change

  • Global Collaboration: Countries around the world need to recognize the importance of collaborative efforts to combat climate change. International agreements and accords should focus not only on reducing emissions but also on providing resources for regions hardest hit by the consequences of global warming. 
  • Research and Innovation: Investment in scientific research to understand the specific challenges posed by climate change in the Amazon is vital. Solutions driven by technology and innovation can help in monitoring, mitigation, and adaptation. 
  • Local Community Empowerment: The indigenous communities of the Amazon have lived harmoniously with their environment for centuries. Empowering them with resources and integrating their traditional knowledge with modern conservation efforts can lead to sustainable results.


While the immediate concern is the alarming number of dolphin deaths, the broader issue points towards the far-reaching consequences of climate change and human interference. The current crisis serves as a poignant reminder of the urgency to address these challenges and work towards sustainable solutions for the future. Click here to know more.


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