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Human impacts on the Earth's magnetic fieldThen again, perhaps any magnetic changes of a natural kind may also play a role? Earth's magnetic field is weakening 10 times faster now
Humans have an impact on so many aspects of the earth's ecology. While wrangling with the magnetic field might seem like an activity that is out of our reach, human-induced electromagnetic noise could be a concern for migrating animals.
In a 2014 study published in the journal Nature, laboratory studies on robins showed birds that were exposed to background electromagnetic noise had trouble discerning which way was south.
While other studies have not seen the same impact from everyday background noise, it's prudent to be aware that human-induced electromagnetic disturbances could have an impact on some animals' highly-tuned sensory systems.

Comment: With our planet undergoing extreme temperature swings in its descent to a much colder climate overall, as well as a number of other contributing factors, these algae bloom events appear to be on the increase: