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Increasing jellyfish populations: trends in Large Marine Ecosystems

  • JELLYFISH BLOOMS
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Jellyfish Blooms IV

Part of the book series: Developments in Hydrobiology ((DIHY,volume 220))

Abstract

Although there are various indications and claims that jellyfish (i.e., scyphozoans, cubozoans, most hydrozoans, ctenophores, and salps) have been increasing at a global scale in recent decades, a rigorous demonstration of this has never been presented. Because this is mainly due to scarcity of quantitative time series of jellyfish abundance from scientific surveys, we attempt to complement such data with non-conventional information from other sources. This was accomplished using the analytical framework of fuzzy logic, which allows the combination of information with variable degrees of cardinality, reliability, and temporal and spatial coverage. Data were aggregated and analyzed at the scale of Large Marine Ecosystem (LME). Of the 66 LMEs defined thus far that cover the world’s coastal waters and seas, trends of jellyfish abundance after 1950 (increasing, decreasing, or stable/variable) were identified for 45, with variable degrees of confidence. Of those 45 LMEs, the majority (28 or 62%) showed increasing trends. These changes are discussed in the context of possible sources of bias and uncertainty, along with previously proposed hypotheses to explain increases in jellyfish.

Guest editors: J. E. Purcell, H. Mianzan & J. R. Frost / Jellyfish Blooms: Interactions with Humans and Fisheries

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Acknowledgments

We thank the numerous scientists and marine professionals around the globe who kindly donated their knowledge and opinions of jellyfish populations. We also thank two anonymous reviewers and the guest editors of this volume whose comments improved the manuscript. This is a contribution from the Sea Around Us Project, a collaboration between the University of British Columbia’s Fisheries Centre and the Pew Environment Group.

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Brotz, L., Cheung, W.W.L., Kleisner, K., Pakhomov, E., Pauly, D. (2012). Increasing jellyfish populations: trends in Large Marine Ecosystems. In: Purcell, J., Mianzan, H., Frost, J.R. (eds) Jellyfish Blooms IV. Developments in Hydrobiology, vol 220. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5316-7_2

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