Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 588:59-70 (2018) - DOI: https://doi.org/10.3354/meps12460 Increasing temperature may shift availability of euphausiid prey in the Southern Ocean Kate Richerson1,2,5,*, Ryan Driscoll1,3, Marc Mangel1,4 1Center for Stock Assessment Research, Department of Applied Mathematics and Statistics, University of California Santa Cruz, Santa Cruz, CA 95064, USA 2Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95064, USA 3Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA 4Theoretical Ecology Group, Department of Biology, University of Bergen, Bergen 9020, Norway 5Present address: School of Aquatic and Fisheries Sciences, University of Washington, Seattle, WA 98105, USA *Corresponding author: katericherson@gmail.com ABSTRACT: Climate change is predicted to affect Southern Ocean biota in complex ways. Euphausiids play a crucial role in the trophodynamics of the ecosystem, and their status under future environmental scenarios is the subject of much concern. Thysanoessa macrura is the most widely distributed, numerically abundant, and ubiquitous euphausiid south of the Polar Front and may be an underappreciated prey species. T. macrura is eurythermic and may be better able to tolerate warming ocean temperatures in comparison to the more stenothermic Antarctic krill Euphausia superba. We use temperature-dependent growth models and biomass per recruit to investigate how the availability of this euphausiid to predators may change under a range of temperature scenarios. We contrast this with the availability of E. superba and find that, under some ranges of temperature change, increasing T. macrura growth may be able to partially compensate for decreasing E. superba growth in terms of biomass available for predators. However, in spite of its considerable biomass, other aspects of this species, such as its size and habitat, may limit its potential to replace E. superba in the diet of many predators. KEY WORDS: Thysanoessa macrura · Euphausia superba · Growth · Temperature · Climate change · Krill predators · Southern Ocean · Euphausiids · Modeling Full text in pdf format Supplementary material PreviousNextCite this article as: Richerson K, Driscoll R, Mangel M (2018) Increasing temperature may shift availability of euphausiid prey in the Southern Ocean. Mar Ecol Prog Ser 588:59-70. https://doi.org/10.3354/meps12460 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 588. Online publication date: February 08, 2018 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2018 Inter-Research.
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