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Depth and temperature profiles reflect individual differences in the daytime diving behaviours of pelagic thresher sharks

Oliver, Simon P.
; 
Grothues, Thomas M.
; 
Mayo, Zoe J.
; 
Williams, Amie
; 
Silvosa, Medel
; 
Cases, Gary
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Affiliation
University of Chester; The Thresher Shark Research and Conservation Project; The State University of New Jersey; University of Liverpool; NatureScot; Mindanao State University; Divelink Cebu
EPub Date
Publication Date
2023-02-09
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Biological Sciences
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Abstract
We used acoustic telemetry to investigate the roles of depth and temperature in the daytime foraging behaviours of 13 tagged pelagic thresher sharks by monitoring their fine scale vertical movements in the Philippines. Cumulatively, pelagic thresher shark dives traversed the entire water column where they encountered temperatures that ranged from 33oC at the surface to 12oC at 250m depths throughout the day, but the movements of individuals varied in the extent of both their deep and shallow water limits. Dives were not synchronized to diurnal cycles, and periodicity reflected cycles of similar dives, the dives themselves, deviations, cruising, and individuality. Pelagic thresher shark movements between the warm surface layer and cooler waters below the thermocline (155 – 175 m) may reflect a common Alopiid strategy that balances maintaining tolerable ambient water temperatures with opportunities to search for and forage on spatially patchy distributions of prey.
Citation
Oliver, S. P., Grothues, T. M., Mayo, Z. J., Williams, A. L., Silvosa, M., & Cases, G. (2023). Depth and temperature profiles reflect individual differences in the daytime diving behaviour of pelagic thresher sharks. Frontiers in Marine Science, 10, 1128473. https://doi.org/10.3389/fmars.2023.1128473
Publisher
Frontiers Media
Journal
Frontiers in Marine Science
Research Unit
URI
http://hdl.handle.net/10034/627444
DOI
10.3389/fmars.2023.1128473
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Article
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© 2023 Oliver, Grothues, Mayo, Williams, Silvosa and Cases
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2296-7745
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https://www.frontiersin.org/articles/10.3389/fmars.2023.1128473/abstract