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Behavioural maintenance of highly localised jellyfish (Copula sivickisi, class Cubozoa) populations

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Abstract

The medusae of cubozoan jellyfishes have sophisticated behaviours and are strong swimmers. Therefore, they have the potential to influence their distribution and connectivity among populations. We used ecological and behavioural data in combination with local oceanography to estimate the potential of medusae in the cubozoan Copula sivickisi to disperse from local populations at scales of hundreds of meters to kilometres. The distribution of C. sivickisi was mapped on a fringing reef at Magnetic Island, Queensland, Australia, with underwater jellyfish camera units (JCams). The availability of reef habitat, dominated by Sargassum sp. algae and coral, had a significant effect on the abundance of medusae. Medusae were 11–7 times more abundant at shallow (≤ 4.1 m) and mid-depth (4.2–7 m) sites with high to moderate habitat availability, compared to deep sites (≥ 7.1 m) where habitat availability was low. Further, medusae were absent at sites far from suitable habitat, both alongshore and in deeper waters. Medusae displayed preferential habitat selection. They were found low in the water column near reefs in depth stratified plankton tows and they preferentially attached to Sargassum in a habitat choice experiment. The swimming speeds of C. sivickisi medusae were determined experimentally and were equivalent to or faster than most of the current speeds measured where the populations occured. The results suggested that medusae can attach to habitat and swim against currents to maintain positions on reefs, thereby restricting dispersal. Incipient speciation is highly likely within the species’ cosmopolitan distribution.

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Acknowledgements

The authors would like to thank Mark O’Callaghan for his great help with the field work. Figures 2 and 3 contain symbols from the Integration & Application Network Symbol Libraries (https://ian.umces.edu/symbols/) authored by Tracey Saxby and Diana Kleine. We thank the Australian Research Council, Centre of Excellence for Coral Reef Studies and James Cook University for their financial support. Finally, we thank the anonymous reviewers who took the time to provide valuable feedback on the manuscript.

Funding

This research was supported by funding from the Australian Research Council, Centre of Excellence for Coral Reef Studies awarded to Michael Kingsford and funding from James Cook University, College of Science and Engineering provided to Jodie Schlaefer.

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Correspondence to Jodie A. Schlaefer.

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The authors have no conflict of interest. All data from this research are available on request.

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This research was conducted in accordance with James Cook University’s Animal Ethics Committee’s policies, procedures and guidelines. No specific permissions were required.

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Schlaefer, J.A., Wolanski, E., Yadav, S. et al. Behavioural maintenance of highly localised jellyfish (Copula sivickisi, class Cubozoa) populations. Mar Biol 167, 40 (2020). https://doi.org/10.1007/s00227-020-3646-6

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  • DOI: https://doi.org/10.1007/s00227-020-3646-6

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