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Symbiotic stony and soft corals: Is their host-algae relationship really mutualistic at lower mesophotic reefs?
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2021-11-24 , DOI: 10.1002/lno.11990 Christine Ferrier‐Pagès 1 , Vanessa Bednarz 1 , Renaud Grover 1 , Yehuda Benayahu 2 , Jean‐François Maguer 3 , Cecile Rottier 1 , Joerg Wiedenmann 4 , Maoz Fine 5, 6
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2021-11-24 , DOI: 10.1002/lno.11990 Christine Ferrier‐Pagès 1 , Vanessa Bednarz 1 , Renaud Grover 1 , Yehuda Benayahu 2 , Jean‐François Maguer 3 , Cecile Rottier 1 , Joerg Wiedenmann 4 , Maoz Fine 5, 6
Affiliation
Mesophotic coral ecosystems (30–150 m depth) present a high oceanic biodiversity, but remain one of the most understudied reef habitats, especially below 60 m depth. Here, we have assessed the rates of photosynthesis and dissolved inorganic carbon (DIC) and nitrogen (DIN) assimilation by Symbiodiniaceae associated with four soft coral species of the genus Sinularia and two stony coral species of the genus Leptoseris collected respectively at 65 and 80–90 m depth in the Gulf of Eilat. Our study demonstrates that both Leptoseris and Sinularia species have limited autotrophic capacities at mid-lower mesophotic depths. DIC and DIN assimilation rates were overall ~ 10 times lower compared to shallow corals from 10 m depth in the same reef. While Leptoseris symbionts transferred at least 50% of the acquired nitrogen to their host after 8-h incubation, most of the nitrogen was retained in the symbionts of Sinularia. In addition, the host tissue of Sinularia species presented a very high structural carbon to nitrogen ratio (C : N) compared to Leptoseris or to the shallow coral species, suggesting nitrogen limitation in these mesophotic soft corals. The limited capacity of soft coral symbionts to acquire DIN and transfer it to the coral animal, as well as the high C : N ratios, might explain the scarcity of symbiotic soft corals at mid-lower mesophotic depths compared to their prevalence in the shallower reef. Overall, this study highlights the significance of DIN for the distribution of the Cnidarian- Symbiodiniaceae association at mesophotic depth.
中文翻译:
共生石珊瑚和软珊瑚:它们的宿主-藻类关系在中光层较低的珊瑚礁中真的是互惠互利的吗?
中光珊瑚生态系统(30-150 m 深度)呈现出高度的海洋生物多样性,但仍然是研究最少的珊瑚礁栖息地之一,尤其是在 60 m 深度以下。在这里,我们评估了 Symbiodiniaceae 的光合作用和溶解无机碳 (DIC) 和氮 (DIN) 同化的速率,与分别在 65 和 80 收集的四种Sinularia属软珊瑚物种和Leptoseris属的两种石珊瑚物种相关。埃拉特湾 90 m 深。我们的研究表明,Leptoseris和Sinularia物种在中光深度的中下部具有有限的自养能力。与同一珊瑚礁中 10 m 深度的浅珊瑚相比,DIC 和 DIN 同化率总体低 10 倍。虽然Leptoseris共生体在孵育 8 小时后将至少 50% 的获得的氮转移到它们的宿主中,但大部分氮保留在Sinularia的共生体中。此外,与Leptoseris相比, Sinularia物种的宿主组织呈现出非常高的结构碳氮比 (C: N)或浅层珊瑚物种,表明这些中光软珊瑚存在氮限制。软珊瑚共生体获取 DIN 并将其转移给珊瑚动物的能力有限,以及高 C : N 比率,可能解释了与它们在较浅的珊瑚礁中的流行相比,中下中层深度共生软珊瑚的稀缺性. 总体而言,这项研究强调了 DIN 对中光深度刺胞-共生菌科关联分布的重要性。
更新日期:2022-01-17
中文翻译:
共生石珊瑚和软珊瑚:它们的宿主-藻类关系在中光层较低的珊瑚礁中真的是互惠互利的吗?
中光珊瑚生态系统(30-150 m 深度)呈现出高度的海洋生物多样性,但仍然是研究最少的珊瑚礁栖息地之一,尤其是在 60 m 深度以下。在这里,我们评估了 Symbiodiniaceae 的光合作用和溶解无机碳 (DIC) 和氮 (DIN) 同化的速率,与分别在 65 和 80 收集的四种Sinularia属软珊瑚物种和Leptoseris属的两种石珊瑚物种相关。埃拉特湾 90 m 深。我们的研究表明,Leptoseris和Sinularia物种在中光深度的中下部具有有限的自养能力。与同一珊瑚礁中 10 m 深度的浅珊瑚相比,DIC 和 DIN 同化率总体低 10 倍。虽然Leptoseris共生体在孵育 8 小时后将至少 50% 的获得的氮转移到它们的宿主中,但大部分氮保留在Sinularia的共生体中。此外,与Leptoseris相比, Sinularia物种的宿主组织呈现出非常高的结构碳氮比 (C: N)或浅层珊瑚物种,表明这些中光软珊瑚存在氮限制。软珊瑚共生体获取 DIN 并将其转移给珊瑚动物的能力有限,以及高 C : N 比率,可能解释了与它们在较浅的珊瑚礁中的流行相比,中下中层深度共生软珊瑚的稀缺性. 总体而言,这项研究强调了 DIN 对中光深度刺胞-共生菌科关联分布的重要性。