Benthic buffers and boosters of ocean acidification on coral reefs

被引:56
|
作者
Anthony, K. R. N. [1 ,4 ]
Diaz-Pulido, G. [2 ,3 ]
Verlinden, N. [4 ]
Tilbrook, B. [5 ]
Andersson, A. J. [6 ]
机构
[1] Australian Inst Marine Sci, Townsville, Qld 4810, Australia
[2] Griffith Univ, Griffith Sch Environm, Nathan, Qld 4111, Australia
[3] Griffith Univ, Australian Rivers Inst Coasts & Estuaries, Nathan, Qld 4111, Australia
[4] Univ Queensland, St Lucia, Qld 4072, Australia
[5] CSIRO, Hobart, Tas 7000, Australia
[6] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
基金
美国国家科学基金会; 澳大利亚研究理事会;
关键词
PRIMARY PRODUCTIVITY; CARBON-DIOXIDE; MASS-TRANSFER; BARRIER-REEF; MARINE; ALGAE; PHOTOSYNTHESIS; CALCIFICATION; CHEMISTRY; COMMUNITY;
D O I
10.5194/bg-10-4897-2013
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Ocean acidification is a threat to marine ecosystems globally. In shallow-water systems, however, ocean acidification can be masked by benthic carbon fluxes, depending on community composition, seawater residence time, and the magnitude and balance of net community production (NCP) and calcification (NCC). Here, we examine how six benthic groups from a coral reef environment on Heron Reef (Great Barrier Reef, Australia) contribute to changes in the seawater aragonite saturation state (Omega(a)). Results of flume studies using intact reef habitats (1.2m by 0.4 m), showed a hierarchy of responses across groups, depending on CO2 level, time of day and water flow. At low CO2 (350-450 mu atm), macroalgae (Chnoospora implexa), turfs and sand elevated Omega(a) of the flume water by around 0.10 to 1.20 h(-1) - normalised to contributions from 1m(2) of benthos to a 1m deep water column. The rate of Omega(a) increase in these groups was doubled under acidification (560-700 mu atm) and high flow (35 compared to 8 cm s(-1)). In contrast, branching corals (Acropora aspera) increased Omega(a) by 0.25 h(-1) at ambient CO2 (350-450 mu atm) during the day, but reduced Omega(a) under acidification and high flow. Nighttime changes in Omega(a) by corals were highly negative (0.6-0.8 h(-1)) and exacerbated by acidification. Calcifying macroalgae (Halimeda spp.) raised Omega(a) by day (by around 0.13 h(-1)), but lowered Omega(a) by a similar or higher amount at night. Analyses of carbon flux contributions from benthic communities with four different compositions to the reef water carbon chemistry across Heron Reef flat and lagoon indicated that the net lowering of Omega(a) by coral-dominated areas can to some extent be countered by long water-residence times in neighbouring areas dominated by turfs, macroalgae and carbonate sand.
引用
收藏
页码:4897 / 4909
页数:13
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