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• W2013455576 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 294:189-200 (2005) - doi:10.3354/meps294189 Metabolic performance and survival of medusae in estuarine hypoxia Ladd D. Rutherford Jr*, Erik V. Thuesen Laboratory One, The Evergreen State College, Olympia, Washington 98505, USA *Email: rutherfl@evergreen.edu ABSTRACT: Increasing eutrophication and hypoxia in marine environments appear to differentially promote the survival of some medusae species and the disappearance of others. To understand the physiological basis for this phenomenon, respiration rates and critical oxygen tensions (Pc) were measured for 12 species of medusae from Puget Sound (Washington State, USA). Mean mass-specific respiration rates ranged between 0.064 µmol O2 g–1 h–1 for Aequorea victoria to 0.78 µmol O2 g–1 h–1 for Cyanea capillata. Six of 12 species studied were oxyregulators; including the scyphomedusae Aurelia labiata, C. capillata, and Phacellophora camtschatica and the hydromedusae A. victoria, Polyorchis penicillatus, and Proboscidactyla flavicirrata. Mean Pcs ranged from 5.5 hPa in Muggiaea atlantica to 39.5 hPa in Euphysa flammea. The relationship between mass-specific metabolic rate and Pc was significant for oxyregulators but not oxyconformers. An apparent metabolic depression occurred variably within all oxyregulating species and 2 oxyconforming species, Clytia gregaria and Sarsia sp., whereby sub-Pc oxygen uptake decreased by 77 to 99% relative to standard aerobic metabolic rate (SMR). Anoxia survival varied from less than 2 h for E. flammea and Eutonina indicans to more than 10 h for A. victoria. The poor low oxygen tolerance of several Puget Sound species in our study was consistent with the historical disappearance of related species in the Adriatic Sea following increased frequency of dysaerobic events. Interspecies variation in aerobic metabolic characteristics and hypoxia and anoxia tolerance may explain why some medusae thrive in low-oxygen conditions, while others disappear. KEY WORDS: Medusae · Oxyregulation · Hypoxia tolerance · Critical PO2 · Hydromedusae · Scyphomedusae Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 294. Online publication date: June 09, 2005 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2005 Inter-Research." @default.
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• W2013455576 title "Metabolic performance and survival of medusae in estuarine hypoxia" @default.
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