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19 April 2021 Elasmobranch (Chondrichthyes, Elasmobranchii) Habitat Use in an Insular Tropical Lagoon in Exuma, The Bahamas
Ellery Lennon, Kathleen Sullivan Sealey
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Abstract

Elasmobranchs (sharks, rays, skates, and sawfish) exert top-down pressure in tropical lagoons and are necessary for maintaining trophic balance, so it is important to understand how abiotic factors drive shark and ray movement and habitat use in a tropical lagoon. Our aim was to assess patterns of lagoon use by sharks and rays in Anne's Creek, Exuma, The Bahamas. Four different elasmobranch species (Hypanus americanus, Styracura schmardae, Ginglymostoma cirratum, and Negaprion brevirostris) were observed using non-invasive visual surveys from the mouth of the lagoon in the summer of 2019 and the winter of 2020. Ray presence was significantly higher in the winter than in the summer and their presence is negatively correlated with temperature in the winter, which suggests a preference for cooler temperatures that affects ray nearshore habitat use. Ray presence was also changed with tidal phase and was weakly negatively correlated with tidal depth. Shark presence was not significantly correlated with season, temperature, or tides – this could be due to low sample sizes as sharks were less abundant than rays. Ultimately, understanding abiotic forces that drive shark and ray habitat use can help predict how they may respond to temperature changes and sea level rise associated with climate change.

© Copyright 2021 by the College of Arts and Sciences of the University of Puerto Rico, Mayagüez
Ellery Lennon and Kathleen Sullivan Sealey "Elasmobranch (Chondrichthyes, Elasmobranchii) Habitat Use in an Insular Tropical Lagoon in Exuma, The Bahamas," Caribbean Journal of Science 51(1), 20-29, (19 April 2021). https://doi.org/10.18475/cjos.v51i1.a3
Published: 19 April 2021
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