By Christine Dell’Amore, National Geographic News
Published April 12, 2013
One by one, Miller, a marine-wildlife veterinarian, eliminated the potential causes of death until “the last thing I was left with seemed so implausible that I thought I was going crazy.”
The otters had been poisoned by a “nasty toxin” called microcystin, which is produced by cyanobacteria, or blue-green algae. Such toxins can appear when human sewage and fertilizers run into lakes and rivers, adding nutrients that spur the growth of algae “superblooms,” Miller said.
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Indian River Guardian 