Contrasting seasonal responses in dinitrogen fixation between shallow and deep-water colonies of the model coral Stylophora pistillata in the northern Red Sea.
Contrasting seasonal responses in dinitrogen fixation between shallow and deep-water colonies of the model coral Stylophora pistillata in the northern Red Sea.
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DOI：
10.1371/journal.pone.0199022
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Wild C
中科院分区：
文献类型：
--
作者：
Bednarz VN;Naumann MS;Cardini U;van Hoytema N;Rix L;Al-Rshaidat MMD;Wild C
热带珊瑚通常与固氮菌（固氮菌）有关，关键环境参数的季节性变化，如溶解无机氮（DIN）的可用性和海水温度，已知会影响珊瑚微生物全生物的固氮作用。尽管，那么，这种潜在的季节性和深度相关的变化，氮固定在珊瑚礁，这种变化尚未进行调查。因此，本研究量化的季节性（冬季与夏季）N2固定率与建礁珊瑚Stylophora pistillata收集深度为5，10和20米的北方海湾的亚喀巴（红海）。研究结果显示，所有深度的珊瑚在贫营养的夏季表现出最高的N2固定率，当高达11%的光代谢氮需求（CPND）可以满足N2固定。虽然N2固定保持季节性稳定的深珊瑚（20米），它显着下降的浅珊瑚（5和10米）在DIN丰富的冬季，占不到2%的珊瑚的CPND。不同深度的珊瑚在N2固定方面的这种对比鲜明的季节性反应可能受到以下因素的驱动：1）珊瑚衍生的有机物的释放速率，2）相关固氮生物的群落组成，和/或3）共生藻群落的营养获取。
Tropical corals are often associated with dinitrogen (N2)-fixing bacteria (diazotrophs), and seasonal changes in key environmental parameters, such as dissolved inorganic nitrogen (DIN) availability and seawater temperature, are known to affect N2 fixation in coral-microbial holobionts. Despite, then, such potential for seasonal and depth-related changes in N2 fixation in reef corals, such variation has not yet been investigated. Therefore, this study quantified seasonal (winter vs. summer) N2 fixation rates associated with the reef-building coral Stylophora pistillata collected from depths of 5, 10 and 20 m in the northern Gulf of Aqaba (Red Sea). Findings revealed that corals from all depths exhibited the highest N2 fixation rates during the oligotrophic summer season, when up to 11% of their photo-metabolic nitrogen demand (CPND) could be met by N2 fixation. While N2 fixation remained seasonally stable for deep corals (20 m), it significantly decreased for the shallow corals (5 and 10 m) during the DIN-enriched winter season, accounting for less than 2% of the corals’ CPND. This contrasting seasonal response in N2 fixation across corals of different depths could be driven by 1) release rates of coral-derived organic matter, 2) the community composition of the associated diazotrophs, and/or 3) nutrient acquisition by the Symbiodinium community.
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