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Name: Indian River Lagoon 2021-2024 Manatee Distribution Survey Observations

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Description: Aerial distribution surveys are used by marine mammal biologists from Florida Fish & Wildlife Conservation Commission-Fish & Wildlife Research Institute (FWC-FWRI) 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. This survey was conducted by three aircraft mostly following historical flight paths used for past county-wide distribution surveys. However, some changes were made to shorten the flight route or to cover areas not flown in previous surveys. See trackline metadata for details of flight path modifications. Flight paths curved parallel to the shoreline, and the airplane circled when manatees were spotted until a count of the number of animals in each group was obtained. Circling was limited to 3 passes unless a group was unusually large and aerial photos were used in some cases to confirm counts. Sightings data were recorded on paper maps and entered into a GIS shapefile for spatial analysis using NAIP 2021 - 2022 imagery and recorded flight paths as a reference. GIS is a computer software system for representing data spatially and for conducting spatial analyses. Counts presented in this data set are assumed to be minimum counts and have not been corrected for detection bias (either perception or availability) and the absence of sightings in an area does not mean that no animals were present. This dataset includes recorded manatee sightings from 21 surveys flown on the following dates: 21 Oct 2021; 16 Dec 2021;14 Jan 2022; 20 and 21 Feb 2022; 20 and 21 March 2022; 23 May 2022; 09 and 12 Aug 2022; 16 and 17 Oct 2022; 9, 10, and 11 Dec 2022; 20 Jan 2023; 13 and 14 Feb 2023; 22, 23, and 24 Mar 2023; 9 and 10 May 2023; 21 and 22 Aug 2023; 9, 10, and 14 October 2023; 19 and 20 Dec 2023; 10 and 11 Jan 2024; 14 and 22 Feb 2024; 12 Mar 2024; 23 and 24 May 2024; and 20 and 23 August 2024. FWC and Mote Marine Laboratory staff members were primary observers for these flights, and dual observers (two observers, one in the front seat and one in the rear seat) were present on some or all of survey flights. The survey area includes the Indian River Lagoon from the Jupiter Inlet to A1A in New Smyrna Beach, Florida. Some areas along the planned flight path may have been partially surveyed or not surveyed at all due to air traffic, weather, or other constraints present during individual surveys.

Copyright Text: Funding for these surveys was provided by U.S. Fish and Wildlife Services grant #5460. Flights were flown and data were collected by staff from Florida Fish & Wildlife Conservation Commission and Mote Marine Laboratory. Data were 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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