No aerial manatee survey this year
ST. PETERSBURG -- For the first time since 1994, Florida's annual aerial survey of manatees has been canceled. The cause: Winter was too warm.
The aerial survey, overseen by the Florida Fish and Wildlife Research Institute in St. Petersburg, has been going on since 1991. It may involve up to 60 scientists from federal, state and county agencies, as well as nonprofit groups like Mote Marine Laboratory, working together to see how many manatees they can spot from circling airplanes or helicopters.
The survey is designed to take advantage of winter weather, when cold-sensitive manatees gather at warm-water sites like power plant discharges. But for the counts to be accurate, scientists say they need certain weather conditions, such as clear skies and temperatures below 50 degrees for three days.
When conditions are not perfect, not as many manatees show up in the survey. So after beginning the aerial surveys with flights in 1991 and 1992, state scientists skipped surveys in 1993 and 1994 because the weather was too warm. However, after complaints from boat manufacturers that the scientists weren't counting manatees anymore, the Legislature mandated a survey every year. Scientists have undertaken a survey every year since then.
So the numbers have fluctuated wildly from year to year, as conditions changed and counting methods improved. A survey in January 1998 found 2,018 manatees, while a survey in January 1999 found just 1,865 of them. The record, hit in January 2001, is 3,300. Last year’s count, taken at the end of January, found 2,817.
State officials had hoped to unveil a new method of counting manatees this year, one that used a computer program to estimate how many manatees might be missed by the aerial census-takers. But the weather never got cold enough for the planes to take to the air, a spokeswoman for FWRI said.
Craig Pittman, Times staff writer
[Craig Pittman, Times files]


