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• W1983408365 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 351:1-13 (2007) - DOI: https://doi.org/10.3354/meps07298 Jellyfish modify the response of planktonic assemblages to nutrient pulses Kylie A. Pitt1,*, Michael J. Kingsford2, David Rissik3, Klaus Koop4 1Australian Rivers Institute (Coast and Estuaries) and Griffith School of Environment, Gold Coast Campus, Griffith University, Queensland 4222, Australia 2School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4810, Australia 3Freshwater and Marine Sciences, Queensland Environmental Protection Agency, 80 Meiers Road, Indooroopilly, Queensland 4068, Australia 4New South Wales Department of Environment and Climate Change, PO Box A290, Sydney South, New South Wales 1232, Australia *Email: k.pitt@griffith.edu.au ABSTRACT: The short-term effects of pulses of nutrients and jellyfish Catostylus mosaicus on planktonic assemblages were investigated in field-based experiments using 3 m3 mesocosms. Experiments ran for 5 d and were repeated in autumn and spring at Lake Illawarra, a coastal lagoon in New South Wales, Australia. Experiments consisted of 2 orthogonal treatments, addition/non-addition of nutrients and presence/absence of jellyfish, and were designed to determine how bottom-up (i.e. addition of nutrients) and top-down (i.e. predation by jellyfish) processes influence planktonic assemblages, both independently and in combination. During both experiments, nutrients stimulated primary production and caused changes in phytoplankton assemblages. Nutrients also stimulated production of large tintinnids, suggesting that bottom-up processes may influence 2 trophic levels. Mesozooplankton were consistently depleted in mesocosms containing jellyfish. Jellyfish also caused changes in microzooplankton assemblages, indicating that top-down processes also cascade to at least 2 trophic levels. In mesocosms to which both nutrients and jellyfish were added during spring, concentrations of the red-tide forming, heterotrophic dinoflagellate Noctiluca scintillans were 20 times greater than in mesocosms to which nutrients were added alone. We hypothesize that addition of nutrients stimulated production of centric diatoms, the main prey of N. scintillans, but that a bloom of N. scintillans only formed when jellyfish were also present because jellyfish grazed on populations of herbivorous mesozooplankton (particularly the calanoid copepod Gladioferens), which generally out-competed N. scintillans for diatom prey. These data provide the first empirical evidence linking jellyfish to the formation of red tides. KEY WORDS: Red tides · Trophic cascades · Catostylus mosaicus · Noctiluca scintillans Full text in pdf format NextCite this article as: Pitt KA, Kingsford MJ, Rissik D, Koop K (2007) Jellyfish modify the response of planktonic assemblages to nutrient pulses. Mar Ecol Prog Ser 351:1-13. https://doi.org/10.3354/meps07298Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 351. Online publication date: December 06, 2007 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2007 Inter-Research." @default.
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• W1983408365 title "Jellyfish modify the response of planktonic assemblages to nutrient pulses" @default.
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