Declining coral calcification in massive Porites in two nearshore regions of the northern Great Barrier Reef
Declining coral calcification in massive Porites in two nearshore regions of the northern Great Barrier Reef
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DOI：
10.1111/j.1365-2486.2007.01520.x
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发表时间：
2008-03-01
影响因子：
11.6
通讯作者：
Lough, Janice M.
中科院分区：
文献类型：
--
作者：
Cooper, Timothy F.;De 'ath, Glenn;Lough, Janice M.
在时间和空间上的变化的生长参数骨骼密度，线性延伸和钙化率在大规模滨珊瑚从两个近岸地区的北方大堡礁（GBR）的研究超过16年的研究期。在GBR上两个相距450公里的地区，大规模滨珊瑚的钙化率下降了约21%。这主要是一个功能的线性延伸（类似于16%）的下降，骨骼密度下降较小（类似于6%），并与以前的研究大规模滨珊瑚生长的环境控制GBR。生长参数随时间呈线性变化。各殖民地的平均骨骼密度随时间下降，从1988年的1.32 g cm（-3）（SE = 0.017）下降到2003年的1.25 g cm（-3）（0.013），相当于0.36% yr（-1）（0.13）。年扩展量从1.52 cm yr（-1）（0.035）下降到1.28 cm yr（-1）（0.026），相当于1.02% yr（-1）（0.39）。钙化率（骨骼密度和年扩展的乘积）从1.96 g cm（-2）yr（-1）（0.049）下降到1.59 g cm（-2）yr（-1）（0.041），相当于1.29% yr（-1）（0.30）。年平均海水温度对骨骼密度没有影响，但对年延伸和钙化有模式效应，最大值在26.7 ℃。各区域之间的生长参数存在微小差异。根据对大规模滨珊瑚长岩心生长记录的分析，随着海水温度的升高，珊瑚钙化程度的下降在近几个世纪是前所未有的。我们讨论的背景下，已知的环境控制珊瑚生长钙化的下降。虽然我们的研究结果与升高的海水温度和pCO（2）对珊瑚钙化的协同效应的研究一致，但我们得出结论，需要进一步研究GBR的海水化学数据，以更好地了解环境变化和对珊瑚生长的影响之间的联系。
Temporal and spatial variation in the growth parameters skeletal density, linear extension and calcification rate in massive Porites from two nearshore regions of the northern Great Barrier Reef (GBR) were examined over a 16-year study period. Calcification rates in massive Porites have declined by approximately 21% in two regions on the GBR similar to 450 km apart. This is a function primarily of a decrease in linear extension (similar to 16%) with a smaller decline in skeletal density (similar to 6%) and contrasts with previous studies on the environmental controls on growth of massive Porites on the GBR. Changes in the growth parameters were linear over time. Averaged across colonies, skeletal density declined over time from 1.32 g cm(-3) (SE = 0.017) in 1988 to 1.25 g cm(-3) (0.013) in 2003, equivalent to 0.36% yr(-1) (0.13). Annual extension declined from 1.52 cm yr(-1) (0.035) to 1.28 cm yr(-1) (0.026), equivalent to 1.02% yr(-1) (0.39). Calcification rates (the product of skeletal density and annual extension) declined from 1.96 g cm(-2) yr(-1) (0.049) to 1.59 g cm(-2) yr(-1) (0.041), equivalent to 1.29% yr(-1) (0.30). Mean annual seawater temperatures had no effect on skeletal density, but a modal effect on annual extension and calcification with maxima at similar to 26.7 degrees C. There were minor differences in the growth parameters between regions. A decline in coral calcification of this magnitude with increasing seawater temperatures is unprecedented in recent centuries based on analysis of growth records from long cores of massive Porites. We discuss the decline in calcification within the context of known environmental controls on coral growth. Although our findings are consistent with studies of the synergistic effect of elevated seawater temperatures and pCO(2) on coral calcification, we conclude that further data on seawater chemistry of the GBR are required to better understand the links between environmental change and effects on coral growth.