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Feeling pressured
Natural History, April, 2004 by Stephan Reebs
Several hours before tropical storm Gabrielle struck Florida's Gulf Coast on September 14, 2001, all the juvenile blacktip sharks living in a shallow coastal nursery in Terra Ceia Bay moved to deeper--and safer--waters offshore. Michelle R. Heupel and her colleagues from the Mote Marine Laboratory in Sarasota painstakingly ruled out possible reasons for the sharks' collective departure--the noise of heavy rainfall, the decline in the bay's salinity, increased wind speed, abnormal tides.
The only environmental cue that truly coincided with the departure time was a sudden drop in barometric pressure. That finding is the first behavioral evidence that some sharks (and perhaps other coastal species) come equipped with an internal barometer, enabling them to anticipate storms and hurricanes. ("Running before the storm: Blacktip sharks respond to falling barometric pressure associated with Tropical Storm Gabrielle," Journal of Fish Biology 63:1357-63, November 2003)
COPYRIGHT 2004 Natural History Magazine, Inc.
COPYRIGHT 2008 Gale, Cengage Learning
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