While it's too early to tell whether the mortality rate will reach or surpass the 2006 record of 417 deaths in one year, as of Aug. 14 researchers accounted for 324 dead manatees discovered in Florida waters. The deaths surpass the number of manatee deaths during the same time period for every year since 2004.
In January, an annual aerial survey of manatees determined at least 3,807 manatees swim in Florida waters.
According to the Florida Fish and Wildlife Research Institute, 67 manatees died this year from water craft injuries, five from flood gate or lock injuries, five from other human causes, 88 from perinatal causes, 53 from cold stress, 22 from various natural causes, seven verified but unrecoverable carcasses, 67 from undetermined causes and 10 from "undetermined, other" causes.
Lee County remains an epicenter for manatee mortalities. Eighty-eight of the dead manatees this year were recovered from Lee County waters. This year, Charlotte County waters has seen seven manatee deaths to date, while Sarasota County is listed as having nine deaths to date.
From January 1975 to March 2009, 1,205 manatees died in Lee County. During the same time span, 290 died in Charlotte and 212 died in Sarasota County waters.
The perinatal mortalities refer to deaths of immature manatees. Those numbers are running high, too.
In June, the 3.5-foot carcass of a baby manatee, no more than a week or two old, was discovered in an Overbrook Gardens canal in Englewood. The dead manatee bore no prop wounds or other visible causes of death. After a necropsy performed on the manatee, scientists still couldn't determine the exact cause of death because the carcass was too decomposed. However, none of the infant manatee's bones were broken nor did it show any other signs of sustaining severe trauma before its death.
Why the number for perinatal deaths this year is so high remains a question for scientists, said Martine deWit, a researcher with the institute's pathology laboratory. The deaths may be a result of the cold stress, due to harsh cold days this past winter and drops in water temperatures. Manatee birth rates could also be a factor.
"We don't know," deWit said.
With the 20 percent of deaths due water craft injuries, the numbers tend to jump after holiday weekends, deWit said. After a holiday, more dead manatees show up at the pathology lab in St. Petersburg.
For more information on manatees and other marine life research, visit the Florida Fish and Wildlife Research Institute Web site at http://research.myfwc.com/.
E-mail: reilly@sun-herald.com
By STEVE REILLY
Staff Writer
(http://www.sunnewspapers.net/articles/pnnews.aspx?NewsID=443004&a=newsarchive2/082209/tp1ch3.htm&pnpg=0)
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