AB 24:185-199 (2016)  -  DOI: https://doi.org/10.3354/ab00647

Habitat selection by green turtles in a spatially heterogeneous benthic landscape in Dry Tortugas National Park, Florida

Ikuko Fujisaki1,*, Kristen M. Hart2, Autumn R. Sartain-Iverson3

1University of Florida, Ft. Lauderdale Research and Education Center, Davie, FL 33314, USA
2US Geological Survey, Wetland and Aquatic Research Center, Davie, FL 33314, USA
3Cherokee Nation Technologies, contracted to US Geological Survey, Wetland and Aquatic Research Center, Davie, FL 33314, USA
*Corresponding author:

ABSTRACT: We examined habitat selection by green turtles Chelonia mydas at Dry Tortugas National Park, Florida, USA. We tracked 15 turtles (6 females and 9 males) using platform transmitter terminals (PTTs); 13 of these turtles were equipped with additional acoustic transmitters. Location data by PTTs comprised periods of 40 to 226 d in varying months from 2009 to 2012. Core areas were concentrated in shallow water (mean bathymetry depth of 7.7 m) with a comparably dense coverage of seagrass; however, the utilization distribution overlap index indicated a low degree of habitat sharing. The probability of detecting a turtle on an acoustic receiver was inversely associated with the distance from the receiver to turtle capture sites and was lower in shallower water. The estimated daily detection probability of a single turtle at a given acoustic station throughout the acoustic array was small (<0.1 in any year), and that of multiple turtle detections was even smaller. However, the conditional probability of multiple turtle detections, given at least one turtle detection at a receiver, was much higher despite the small number of tagged turtles in each year (n = 1 to 5). Also, multiple detections of different turtles at a receiver frequently occurred within a few minutes (40%, or 164 of 415, occurred within 1 min). Our numerical estimates of core area overlap, co-occupancy probabilities, and habitat characterization for green turtles could be used to guide conservation of the area to sustain the population of this species.


KEY WORDS: Acoustic telemetry · Co-occupancy · Habitat selection · Satellite telemetry


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Cite this article as: Fujisaki I, Hart KM, Sartain-Iverson AR (2016) Habitat selection by green turtles in a spatially heterogeneous benthic landscape in Dry Tortugas National Park, Florida. Aquat Biol 24:185-199. https://doi.org/10.3354/ab00647

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