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Dolphins Show Alzheimer’s Signs Amid Toxic Algal Blooms

10/14/2025

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Summary

Story summary

Bottlenose dolphins in Florida's Indian River Lagoon show neurotoxin exposure linked to harmful algal blooms, with 2,4-DAB levels up to 3,000 times higher in summer.
The dolphins' brains show Alzheimer’s-like changes, including amyloid plaques and tau tangles.
Scientists warn the findings may signal risks for human health, especially in Miami-Dade County, which has the United States’ highest Alzheimer's prevalence.

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Story summary

Bottlenose dolphins in Florida's Indian River Lagoon show neurotoxin exposure linked to harmful algal blooms, with 2,4-DAB levels up to 3,000 times higher in summer.
The dolphins' brains show Alzheimer’s-like changes, including amyloid plaques and tau tangles.
Scientists warn the findings may signal risks for human health, especially in Miami-Dade County, which has the United States’ highest Alzheimer's prevalence.