Make us your home page

Today’s top headlines delivered to you daily.

(View our Privacy Policy)

Cold blamed for record number of manatees deaths this year

Lars Andersen, 54, of High Springs paddles by a group of about 50 manatees huddled together in the Three Sisters Springs  area in Crystal River on Friday. During the winter, manatees stay close to warmer waters, such as those fed by springs.


Lars Andersen, 54, of High Springs paddles by a group of about 50 manatees huddled together in the Three Sisters Springs area in Crystal River on Friday. During the winter, manatees stay close to warmer waters, such as those fed by springs.

Manatees died in record-breaking numbers this year, but not from being hit by boats or poisoned by Red Tide. Instead, the largest group of the 699 manatees that were killed as of Dec. 5 were done in by bad weather.

A total of 244 manatees were killed by last winter's bitter cold snap, according to figures released Friday by the Florida Fish and Wildlife Conservation Commission's marine biology laboratory in St. Petersburg.

The cold deaths occurred across the state, reaching down even into the Everglades and the Florida Keys.

In addition to those 244, biologists say it is likely the cold temperatures also contributed to many of the 203 deaths that they ranked in the "undetermined" category as well as the 68 deaths in the "unrecovered" category, meaning carcasses that were spotted but could not be reeled in for examination. So far no manatees have been killed by cold this winter, state officials say.

Manatees are particularly sensitive to cold water. When the temperature drops below 68 degrees, they seek winter refuge in the warmer water flowing from springs and power-plant outfalls.

Last winter's cold deaths were different from the normal ones that occur, said Martine deWit, who oversees the state's marine mammal pathology lab in St. Petersburg.

Normally the manatees that are killed by cold die slowly. Their skin develops lesions, their metabolism slows down and they stop eating, she said. Generally they succumb to secondary infections.

But last winter's cold spell killed manatees more quickly, she said, causing what she called "acute cold shock" — akin to severe hypothermia.

Because of so many cold-related deaths, the total number of manatees killed this year is nearly double the five-year average for the same Jan. 1 to Dec. 5 time period. And with three weeks to go in the year, the number will undoubtedly break 700 before the new year arrives.

Although the cold weather was a natural event, biologists say this die-off underscores the importance of warm-water habitat for the long-term survival of the species.

"We have to be careful about reading too much into a single year of data," warned Gil McRae, the director of the state Fish and Wildlife Research Institute in St. Petersburg,

However, McRae pointed out that the mortality numbers are a minimum number. In other words, there were undoubtedly more manatees that died that no one saw — say down amid the Ten Thousand Islands, or along the Big Bend area's sea grass beds.

The same cold spell that killed so many manatees also produced ideal conditions for counting the number of live manatees last year. The result: a record number that topped 5,000 for the first time. That number — 5,076 — was also classified as a minimum number, meaning there could be more manatees out there that did not get counted.

In response to a question about whether the higher death rate is merely the result of having more manatees, McRae said, "The growth rate of the population is tracking less than you'd expect compared to the mortality."

As a result of last winter's wave of cold deaths, state officials have worked hard to make it easier for manatees to get to warm-water refuges, McRae said. They opened up a fence at Homosassa Springs Wildlife State Park that had previously kept wild manatees out of the park.

They also are dredging out an access to another spring.

Speeding boats, which are usually responsible for around a quarter of all manatee deaths, have not come close to that percentage this year. Boats were blamed in the deaths of 79 manatees as of Dec. 5, which is a decline from the record of 97 set last year. However, it's still within the range of the five-year average.

Manatees did dodge one bullet this year. Although this summer's Deepwater Horizon disaster has been blamed for the deaths of hundreds of turtles, thousands of birds and even some dolphins and whales, the gushing oil apparently didn't kill a single manatee.

Craig Pittman can be reached at

Cold blamed for record number of manatees deaths this year 12/10/10 [Last modified: Friday, December 10, 2010 11:03pm]
Photo reprints | Article reprints

© 2017 Tampa Bay Times


Join the discussion: Click to view comments, add yours

  1. Southern heritage groups sue to keep Confederate monument at old Tampa courthouse

    Local Government

    TAMPA — Groups that say they support Southern heritage filed a lawsuit late Friday trying to halt the removal of a Confederate statue from downtown Tampa.

    Workers place boards around a Confederate monument on Hillsborough County property in Tampa on Thursday, August 17, 2017. It took 24 hours to raise private funds in order to move the statue from its current location.
  2. Bucs mull options at right tackle as Dotson awaits MRI


    Right tackle Demar Dotson, the Bucs' most experienced offensive lineman, will undergo an MRI on his injured groin Saturday, three weeks before the season opener.

    Tampa Bay Buccaneer Demar Dotson, offensive tackle, brought his coffee and breakfast to One Buc Place, 7/31/15, as he reported to training camp.
  3. For starters: Rays vs. Mariners, with another new look


    Having lost 11 of their last 14 games and dropping to a season-worst four games under .500 at 60-64, the Rays continue to search for ways to get out of their extended offensive slump.

    And with the M's starting LHP Ariel Miranda today, that means another new look to the lineup, which includes having struggling …

  4. Chasing 125: Bucs hope to hit rushing goal more often


    Ever so often, Bucs coach Dirk Koetter pulls back the curtain a bit and shares some of the stats that matter to him most as a coach.

    Tampa Bay Buccaneers head coach Dirk Koetter walks the field during the second day of mandatory minicamp at One Buccaneer Place in Tampa, Fla., on Wednesday, June 14, 2017.
  5. Two Boca Ciega students arrested on charges they brought gun to high school football game


    PINELLAS PARK — Two Boca Ciega High School students were arrested for having a loaded semi-automatic handgun with them at a Friday night football game at Pinellas Park High School.

    Two Boca Ciega High School students were arrested for bringing a weapon on school property on Friday night at a high school football game at Pinellas Park High School.