Tampa Bay 1987-1994 Manatee Distribution Survey Observations
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Aerial distribution surveys are used by marine mammal biologists from FWC and other agencies to determine the seasonal distribution of manatees. Most surveys are conducted from small, four-seat, high-winged airplanes (Cessna 172 or 182) flying at a height of 500-1000 ft at a speed of 70-90 kts. Small helicopters may be used instead of fixed wing aircraft in urban areas or where waters are particularly opaque and hovering may be required. Flights are usually three hours (west Tampa Bay) and four and half hours (east Tampa Bay) long and are most commonly flown every two weeks for five and half years. The surveys are designed to maximize the manatee counts by concentrating on shallow nearshore waters around the state where manatees and their primary food source, sea grasses, are located. Flight paths curve parallel to the shoreline, and the airplane circles when manatees are spotted until a count of the number of animals in each group is obtained. Offshore waters are usually not surveyed. Dolphin and sea turtle sightings are recorded opportunistically. All aerial data are recorded on paper maps and entered into a GIS shapefile for spatial analysis. GIS is a computer software system for representing data spatially and for conducting spatial analyses. Surveys of Tampa Bay were flown twice a month from November 1987 to May 1994. FWC staff members were observers for these flights. The survey area includes the largest estuary in Florida, which borders Pinellas, Hillsborough, and Manatee counties on Florida’s west coast. Tampa Bay consists of mostly shallow water (average 3m) with Egmont Channel (27m) and the main dredged shipping channels (13m). Five rivers enter the Bay: Hillsborough, Alafia, Little Manatee, Manatee, and Braden rivers. The area includes large expanses of seagrass in Boca Ciega Bay and Anna Maria Sound. Many undeveloped areas under state or federal management were part of the study area, including Egmont Key, Passage Key, and Pinellas national wildlife refuge.
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