Baby sharks know when to run away from hurricanes

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When a hurricane is coming, even baby sharks get out of the way.

Bradley Strickland, a Ph.D. biology student, found juvenile bull sharks fled the safety of the Florida Everglades for the as Hurricane Irma approached in 2017.

Bull sharks use the Shark River estuary in the Florida Everglades as a nursery for the first four years of life. It is highly unusual for them to leave this area until they were ready.

However, as Hurricane Irma got closer to South Florida, almost all of the juveniles headed into deeper waters. Some moved north up the Florida coast. Those that didn't, which tended to be the youngest ones, did not survive. Of those that evacuated, some were found to have moved north up the Florida coast.

"This is not something they usually do until they are older and big enough to leave the nursery," Strickland recently told Forbes. "So, it's interesting to us that the sharks left the familiarity and protection from predators offered by the estuary in order to avoid the dangerous hurricane."

Strickland knows there are questions left to answer about these important predators. Understanding how storms impact shark behavior can help inform how future storms or weather events might impact populations, their place in the food web and more.

This research was published in Estuaries and Coasts and supported by the National Science Foundation through the Florida Coastal Everglades Long-Term Ecological Research program.

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More information: Bradley A. Strickland et al. Movements of Juvenile Bull Sharks in Response to a Major Hurricane Within a Tropical Estuarine Nursery Area, Estuaries and Coasts (2019). DOI: 10.1007/s12237-019-00600-7
Citation: Baby sharks know when to run away from hurricanes (2019, October 1) retrieved 9 April 2020 from
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