Particulate nutrient fluxes over a fringing coral reef: Source‐sink dynamics inferred from carbon to nitrogen ratios and stable isotopes
Particulate nutrient fluxes over a fringing coral reef: Source‐sink dynamics inferred from carbon to nitrogen ratios and stable isotopes
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边缘珊瑚礁上的颗粒养分通量：根据碳氮比和稳定同位素推断的源库动力学
DOI：
10.4319/lo.2013.58.1.0409
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发表时间：
2013
影响因子：
4.5
通讯作者：
A. Waite
中科院分区：
文献类型：
--
作者：
A. Wyatt;Ryan J. Lowe;S. Humphries;A. Waite
我们研究了南半球秋季和春季期间西澳大利亚边缘珊瑚礁（宁加洛珊瑚礁）颗粒有机物 (POM) 动态的时空变化。 POM 总浓度通常在季节或珊瑚礁区域之间没有差异，但 POM 的组成，即碳同位素比 (δ13C-POM)、碳氮比 (C:N) 和脂肪酸，在流经珊瑚礁的水中持续变化。 δ13C-POM和C:N均从前礁到礁滩和泻湖增加，分别为-23.0‰至-20.1‰和7.31至8.34。珊瑚礁群落对 POM 的平均净吸收率在礁顶最高（4 至 30 mmol N m−2 d−1 和 6 至 130 mmol C m−2 d−1），贝叶斯同位素模型证实了外来 POM（海洋浮游植物和浮游动物）高吸收率的独立测量。相反，在礁滩上，观察到 POM 的净释放（−4 至 -5 mmol N m−2 d−1 和 -50 mmol C m−2 d−1），总释放率（估计为 -6 至 -8 mmol N m−2 d−1 和 -30 至 -90 mmol C m−2 d−1），表明本地 POM 的释放可能与异地吸收的量级相似。从总通量角度检查 POM 动态，强化了珊瑚礁系统对外地 POM 供应的海洋学过程的依赖性，并强调了本地 POM 生产为下游底栖和中上层群落提供养分的潜力。
We examined spatial and temporal variations in particulate organic matter (POM) dynamics over a fringing coral reef (Ningaloo Reef) in Western Australia during the austral autumn and spring. Total POM concentrations generally did not differ between seasons or reef zones, but the composition of POM, in terms of carbon isotope ratios (δ13C‐POM), carbon to nitrogen ratios (C : N), and fatty acids, changed consistently in water flowing across the reef. Both δ13C‐POM and C : N increased from the fore reef to the reef flat and lagoon, −23.0‰ to −20.1‰ and 7.31 to 8.34, respectively. Average rates of net POM uptake by the reef community were highest over the reef crest (4 to 30 mmol N m−2 d−1 and 6 to 130 mmol C m−2 d−1), with a Bayesian isotope model confirming independent measurements of high uptake rates of allochthonous POM (oceanic phyto‐ and zooplankton). In contrast, over the reef flat, net release of POM was observed (−4 to −5 mmol N m−2 d−1 and −50 mmol C m−2 d−1), with gross release rates (estimated as −6 to −8 mmol N m−2 d−1 and −30 to −90 mmol C m−2 d−1) indicating that the release of autochthonous POM may be of similar magnitude to allochthonous uptake. Examining POM dynamics in terms of gross fluxes reinforces the dependence of coral reef systems on oceanographic processes for allochthonous POM supply, as well as highlighting the potential for autochthonous POM production to supply nutrients to benthic and pelagic communities downstream.
影响因子：
64.8
作者：
Grottoli, AG;Rodrigues, LJ;Palardy, JE
通讯作者：
Palardy, JE