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Shifting roles of heterotrophy and autotrophy in coral energetics under varying turbidity

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dc.contributor Australian Institute Of Marine Science
dc.contributor Crc Reef Res Ctr
dc.contributor James Cook Univ N Queensland
dc.contributor Dept Marine Biol
dc.contributor James Cook University
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en FABRICIUS, KE ANTHONY, KRN 2013-02-28T06:46:46Z 2013-02-28T06:46:46Z 2017-03-21T01:11:15Z 2019-07-08T02:14:30Z 2017-03-21T01:11:15Z 2013-02-28T06:46:46Z 2013-02-28T06:46:46Z 2019-07-08T02:14:30Z 2000-09-20
dc.identifier 5813 en
dc.identifier.citation Anthony KRN and Fabricius KE (2000) Shifting roles of heterotrophy and autotrophy in coral energetics under varying turbidity. Journal of Experimental Marine Biology and Ecology. 252: 221-253. en
dc.identifier.issn 0022-0981
dc.description.abstract Suspended particulate matter (SPM) strongly alters the trophic environment of photosymbiotic aquatic organisms. At high particles loads, phototrophic energy gains can be diminished due to light absorption by suspended particles, and stress from particle abrasion or deposition on tissues. However, energy gains are enhanced if organisms are able to use SPM as a food source. For photosymbiotic benthic suspension feeders, increases in SPM concentrations may require both phototrophic and heterotrophic acclimation to sustain a positive energy balance. This study provides an experimental analysis of the effects of contrasting light and SPM regimes on the energy budget (scope for growth) of two zooxanthellate corals (Goniastrea retiformis and Porites cylindrica). Using a factorial design in a flow-through Lank system, corals were exposed fur 2 months to shaded and unshaded conditions (equivalent to 3-4 m depth at 4 and 16 mg dry weight SPM 1(-1), respectively) and a. range of controlled SPM loads with a natural organic content (similar to 3% w/w). In G. retiformis, rates of particle ingestion were a linear function of SPM concentration within a broad range (1-30 mg dry weight 1(-1)). After 2 months of shading, photosynthetic acclimation was significant in G. retiformis, but did not compensate for the reduced light level, as daily respiration exceeded daily photosynthesis. However, in response to the prolonged shading, G. retiformis more than doubled its: rate of particle feeding. At high SPM treatments (16 mg dw 1(-1)), sediment feeding by this species compensated fully for the 35-47% lower phototrophy in the shaded treatment. Due to both photo- and hc heterotrophic plasticity, G. retiformis gained tissue and skeletal mass at all experimental levels of light and SPM. in contrast, rates of particle intake by P. cylindrica contributed < 10% to the energy budget in shaded and < 3% in unshaded conditions. Feeding rates of P. cylindrica were half-saturated at similar to 3 mg dry weight 1(-1), and four- to eight-fold lower than those of G. retiformis. Skeletal growth was sustained, but tissue mass and lipid contents declined in shaded and high-SPM treatments, and carbon loss due to shading by SPM was not compensated for by particle feeding. Thus, due to a lack of photo- and heterotrophic plasticity, periods of high turbidity resulted in energy deficiency in P. cylindrica, and high turbidity conditions appeared physiologically unsustainable for this species. This study is the first to show heterotrophic plasticity in a symbiotic coral, and to show that such plasticity can offset stress from high particle loads. It demonstrates that changes in the trophic mode of some coral species are a mechanism for sustaining a positive energy balance in turbid environments, thereby broadening their physiological niche. (C) 2000 Elsevier Science B.V. All rights reserved.
dc.language English
dc.language en en
dc.publisher Elsevier Science en
dc.relation.ispartof Journal of Experimental Marine Biology and Ecology - pages: 252: 221-253 en
dc.relation.ispartof Null
dc.subject Great-barrier-reef
dc.subject Physiological Energetics
dc.subject Energy Budget
dc.subject Ecology
dc.subject Sediment
dc.subject Benthic Organisms
dc.subject Suspension-feeders
dc.subject Reef-building Corals
dc.subject Trophic Plasticity
dc.subject Biochemical-composition
dc.subject Environmental Sciences & Ecology
dc.subject Montastrea-annularis
dc.subject Symbiotic Cnidarian
dc.subject Porites
dc.subject Marine & Freshwater Biology
dc.subject Goniastrea
dc.subject Diet Theory
dc.subject Autotrophy
dc.subject Heterotrophy
dc.subject Anemone Anthopleura-elegantissima
dc.subject Energy Budgets
dc.subject Scleractinian Coral
dc.subject Stylophora-pistillata
dc.subject Turbidity
dc.title Shifting roles of heterotrophy and autotrophy in coral energetics under varying turbidity
dc.type journal article en
dc.identifier.wos WOS:000089364100005

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