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Food quality matters: interplay among food quality, food quantity and temperature affecting life history traits of Aurelia aurita (Cnidaria: Scyphozoa) polyps
GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany.
University of Hamburg, Germany.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Zooplankton ecology)ORCID iD: 0000-0002-3740-5998
GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany.
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2019 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 656, p. 1280-1288Article in journal (Refereed) Published
Abstract [en]

Understanding the interaction between organisms' life history traits and environmental factors is an essential task in ecology. In spite of the increasing appreciation of jellyfish as an important component in marine ecosystem, there are still considerable gaps in understanding how the phase transition from the benthic polyp to the pelagic medusa stage is influenced by multiple environmental factors, including nutrition. To investigate survival, growth, and phase transition of Aurelia aurita polyps, we designed a factorial experiment manipulating food quantity (20μg C, 5μg C and 1.5μg C polyp−1 every other day), food quality (Artemia salina and two dietary manipulated Acartia tonsa), and temperature (13°C, 20°C, and 27°C). Temperature was the key factor determining phase transition of polyps and negatively affecting their survival rate and growth at 27°C, which reflected a summer heatwave scenario. Furthermore, at polyps' optimum tolerance temperature (20°C) in our study, budding reproduction benefits from high food concentrations. Interestingly, polyps fed with food containing high level highly unsaturated fatty acid (HUFA) were able to compensate for physiological stress caused by the extreme temperature, and could enhance budding reproduction at optimum temperature. Moreover, benthic-pelagic coupling (strobilation) was determined by temperature but affected significantly by food conditions. Mild temperature together with optimum food conditions contributes to inducing more polyps, which may potentially bring about great ephyrae recruitments during overwintering. In contrast, heatwave events can potentially regulate plankton community structure accompanied by changes of nutritional conditions of primary and secondary producers and thus, negatively affect the population dynamics of polyps. We suggest a novel polyp tolerance curve, which can help to understand jellyfish population dynamics in different seasons and ecosystems. This sets up a baseline for understanding how anticipated global warming and food conditions may affect the population size of benthic polyps and consequently pelagic medusae.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 656, p. 1280-1288
Keywords [en]
Life history, Multiple stressors, Asexual reproduction, Phase transition, Tolerance curve, Jellyfish
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-79142DOI: 10.1016/j.scitotenv.2018.11.469ISI: 000455039600122PubMedID: 30625657Scopus ID: 2-s2.0-85057726517OAI: oai:DiVA.org:lnu-79142DiVA, id: diva2:1269321
Projects
EcoChange
Funder
Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGEAvailable from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-08-29Bibliographically approved

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Hylander, Samuel

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