Name: St. Johns, Flagler, & Volusia counties 1991-1993 Manatee Distribution Survey Observations

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Description: <a href="http://atoll.floridamarine.org/Data/Metadata/SDE_Current/Manatee_DistObs_StJohns_Flagler_Volusia_1991_1993_pnt.html" target=_blank>For a full FGDC compliant metadata record, please click here. </a> </p> 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 six 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 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 St. Johns, Flagler and Volusia County were flown twice a month from March 1991 to November 1993. FWC staff members were observers for these flights. The survey area includes the coastal, estuarine, and riverine waters of St. Johns, Flagler and Volusia counties. The St. Johns River or tributaries were not included. The survey extended from the Duval-St. Johns county line south to Mosquito Lagoon at the Volusia-Brevard county line. The water bodies included in the survey are Tolomato, Guana, Matanzas, San Sebastian, Tomoka and Halifax rivers; Turnbull Bay and Salt Run; Spruce Creek and Palm Coast canal systems.

Copyright Text: Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute

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