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WIDESPREAD MIXOTROPHY IN REEF-INHABITING SOFT CORALS - THE INFLUENCE OF DEPTH, AND COLONY EXPANSION AND CONTRACTION ON PHOTOSYNTHESIS

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dc.contributor Australian Institute Of Marine Science
dc.contributor Leibniz Zentrum Fur Marine Tropenforschung (zmt)
dc.contributor Ctr Trop Marine Ecol
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en
dc.contributor.author KLUMPP, DW
dc.contributor.author FABRICIUS, KE
dc.date.accessioned 2013-02-28T06:46:38Z
dc.date.accessioned 2013-02-28T06:46:38Z
dc.date.accessioned 2017-03-21T01:10:55Z
dc.date.accessioned 2018-11-01T03:13:06Z
dc.date.available 2017-03-21T01:10:55Z
dc.date.available 2017-03-21T01:10:55Z
dc.date.available 2013-02-28T06:46:38Z
dc.date.available 2018-11-01T03:13:06Z
dc.date.issued 1995-09-01
dc.identifier 1456 en
dc.identifier.citation Fabricius KE and Klumpp DW (1995) Widespread mixotrophy in reef-inhabiting soft corals: the influence of depth, and colony expansion and contraction on photosynthesis. Marine Ecology Progress Series. 125: 195-204. en
dc.identifier.issn 0171-8630
dc.identifier.uri http://epubs.aims.gov.au/11068/1456
dc.description.abstract Primary production, respiration, and bathymetric distribution were investigated in the 10 most common zooxanthellate soft coral genera of mid-shelf reefs of the central Great Barrier Reef, Australia. Oxygen flux of corals, collected from 5 to 20 m depth, was measured at 6 m water depth over 24 h using data-logging respirometers. In most taxa, photosynthetic carbon acquisition was lower than respiratory carbon loss under irradiance conditions of cloudless summer days at 20 m depth [mean rate of net photosynthesis P-n for all taxa: -1.0 +/- 0.5 (SE) mg C g(-1) ash-free dry weight (AFDW) d(-1)], and only slightly higher than respiration at 5 m depth (mean P-n = 1.2 +/- 0.7 mg C g(-1) AFDW d(-1)). Hence, most if not all zooxanthellate taxa were also dependent upon heterotrophic nutrition to cover their carbon demand. Colony contraction significantly reduced photosynthetic productivity in soft coral taxa possessing large polyps. Levels of irradiance required to achieve photosynthetic compensation (I-c) and saturation (I-k) were higher in contracted compared with expanded colonies. The moderate dependence of soft corals on phototrophy was reflected in their bathymetric distribution at Davies Reef. Highest soft coral densities were found at 20 m depth where maximum irradiance was attenuated to about 180 mu E m(-2) s(-1), equivalent to 16% of surface irradiance. At the deeper limits to the distribution of the zooxanthellate taxa, irradiance was sufficient for photosynthesis to compensate respiration for 3 to 6 h d(-1), but was insufficient to saturate photosynthesis.
dc.language English
dc.language en en
dc.relation.ispartof Marine Ecology Progress Series - pages: 125: 195-204 en
dc.relation.ispartof Null
dc.relation.uri http://data.aims.gov.au/metadataviewer/uuid/75b5567c-7e42-4e47-8232-f660e9c06efc en
dc.subject Great-barrier-reef
dc.subject Light-saturation Curves
dc.subject Ecology
dc.subject Symbiotic Coral
dc.subject Bathymetric Distribution
dc.subject Photosynthesis
dc.subject Alcyonaceae
dc.subject Environmental Sciences & Ecology
dc.subject Translocation
dc.subject Marine & Freshwater Biology
dc.subject Heteroxenia-fuscescens
dc.subject Oceanography
dc.subject Zooxanthellae
dc.subject Nutrition
dc.subject Davies-reef
dc.subject Respiration
dc.subject Octocorallia
dc.subject Porites-porites
dc.subject Carbon
dc.subject Coral Reefs
dc.subject Great Barrier Reef
dc.subject Colony Contraction
dc.title WIDESPREAD MIXOTROPHY IN REEF-INHABITING SOFT CORALS - THE INFLUENCE OF DEPTH, AND COLONY EXPANSION AND CONTRACTION ON PHOTOSYNTHESIS
dc.type journal article en
dc.identifier.wos WOS:A1995TB12400019


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