Name: Volusia County 2002-2004 Manatee Distribution Survey Observations

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Description: Aerial distributional surveys are used by marine mammal biologists from FWC and other agencies to determine the seasonal distribution and relative abundance 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 4–6 hours long and are most commonly flown every two weeks for two years. The surveys are designed to maximize the manatee counts by concentrating on shallow nearshore waters 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 Volusia County were flown twice a month from July 2002 to July 2004. FWC staff members were observers for these flights. The survey area includes the northern Volusia County border south along Indian River and along Spruce Creek to the southern Volusia County border.

Service Item Id: 1b25be3cead0417f93c1b9be78df21a6

Copyright Text: Data collected, entered and verified by FWC staff. Use of these data must be credited in any reports or other written publications by the following sentence: "Manatee specific data used in analyses were collected under scientific research permit #MA773494 issued to FWC-FWRI."

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