Abstract
Elasmobranch fishes (sharks, skates, and rays) are hypothesized to use environmental cues, such as the geomagnetic field (GMF), to navigate across the ocean. However, testing the sensory and navigation abilities of large highly migratory fishes in the field is challenging. This laboratory study tested whether the yellow stingray, Urobatis jamaicensis, could detect and distinguish between the GMF cues used by other magnetically sensitive species to actively determine their location. Stingrays were divided into two cohorts for initial behavioral conditioning: one was trained to associate a change in GMF intensity with an aversive stimulus, whereas the other was trained using a change in GMF inclination angle. Individuals from each cohort remained naïve to the GMF conditioning stimulus used to condition the other cohort. The combined group learned the initial association within a mean (± SE) of 184.0 ± 34.8 trials. Next, stingrays from each cohort were randomly exposed to their original GMF conditioning stimulus and the novel GMF stimulus. The original magnetic stimulus continued to be reinforced, whereas the novel stimulus was not. The group demonstrated a significantly different response to the original (reinforced) and novel (non-reinforced) stimuli, which indicates that stingrays could distinguish between the intensity and inclination angle of a magnetic field. This experiment is the first to show that a batoid (skate or ray) can detect and distinguish between changes in GMF intensity and inclination angle, and supports the idea that elasmobranchs might use GMF cues to form a magnetically based cognitive map and derive a sense of location.
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The datasets created during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This research was supported by grants to KCN from the Florida Atlantic University (FAU) Graduate Grant, the Save Our Seas Foundation Small Grant, the Henry F. Mollet Research Award from the American Elasmobranch Society, the Gordon Gilbert Graduate Scholarship from the Friends of Gumbo Limbo Nature Center, and the PADI Foundation Grant. The authors thank S. Creager, A. Murakami, E. Cave, L. Celano, J. Noble, G. Gil, B. Bowers, K. Kramer, and S. Ramirez for help with stingray collection and husbandry, and R. Stackman and M. Salmon for assistance with experimental design and animal training protocols.
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All applicable international, national, and institutional guidelines for the care and use of animals were followed. All procedures performed in these studies involving animals were in accordance with the ethical standards of the Florida Atlantic University Institutional Animal Care and Use Committee under protocols A23-13 and A16-33. Animals were collected pursuant to Florida Fish and Wildlife Conservation Commission Special Activities License SAL 15-1413A-SR.
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Previous work has shown that elasmobranchs (sharks, skates, and rays) can detect magnetic stimuli and might use the Earth’s magnetic field as a navigational cue. However, the specific nature of the geomagnetic cues that elasmobranchs can detect are largely unknown. This study used behavioral conditioning to demonstrate that the yellow stingray, Urobatis jamaicensis, can detect changes in the intensity and inclination angle to the geomagnetic field. These cues change predictably with latitude and are used by other magnetically sensitive species to determine their location during long distance navigation.
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Newton, K.C., Kajiura, S.M. The yellow stingray (Urobatis jamaicensis) can discriminate the geomagnetic cues necessary for a bicoordinate magnetic map. Mar Biol 167, 151 (2020). https://doi.org/10.1007/s00227-020-03763-1
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DOI: https://doi.org/10.1007/s00227-020-03763-1