Skip to main content

Free Content Abundance of West Indian manatees (Trichechus manatus) around selected Florida power plants following winter cold fronts, 1982–1983

Download Article:
(PDF 1018.2216796875 kb)
Seven 1-day aerial surveys were flown during winter, 1982–1983, to assess manatee abundance. The surveys focussed on five Florida Power and Light Company plants: Cape Canaveral (PCC), Riviera (PRV), Port Everglades (PPE), Lauderdale (PFL), and Ft. Myers (PFM). Of the 1,191 manatees sighted during the surveys, 930 were present in the immediate vicinity of the plants. Ten percent of the total animals sighted were calves, with the highest percentage of calves (13.6%) being present at PFM.

Maximum counts of manatees for each plant were as follows: PCC, 15; PRV, 98; PPE, 56; PFL, 16; PFM, 85. With the exception of PRV's maximum count, all of the 1982–1983 maxima represent the lowest maximum counts for the respective plants in 6 years of surveys. The low counts most likely reflect the mild winter temperatures. With the exception of PFM, there is no indication that any regional manatee populations have declined significantly.

Seventeen regressions compared the following variables: intake water temperature at power plants, mean daily air temperature, and number of manatees observed at each plant. Significant correlations were found only for three regressions of water temperature and number of manatees, for one regression of air temperature and number of manatees, and for one regression of all variables. The remaining regressions indicated correlations that were not significant, supporting the contention that winter cold was not of sufficient intensity or duration in 1982–1983 to cause large numbers of manatees to aggregate.

5 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1985-05-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more