Moderate zooxanthellate coral growth rates in the lower photic zone

Moderate zooxanthellate coral growth rates in the lower photic zone
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低透光区虫黄藻珊瑚生长速度适中

DOI:
10.1007/s00338-020-01960-4
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发表时间:
2020
期刊:
影响因子:
3.5
通讯作者:
Shen Chuan-Chou
Shen Chuan-Chou
中科院分区:
生物学2区
文献类型:
--
作者:
Kahng Samuel E.;Watanabe Takaaki K.;Hu Hsun-Ming;Watanabe Tsuyoshi;Shen Chuan-Chou

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低光区光养珊瑚的生态仍然知之甚少。到目前为止的研究表明,当可用光随深度衰减时,生长速度通常会下降,在 > 40米深处生长非常缓慢。在这里,我们提供了极深专性虫黄藻类珊瑚适度生长的详细证据。使用可靠的U-Th测年技术,Leptoserisspp。在夏威夷,从70到110m被确定增长(线性延伸)从8.0My± 3.0到24.6m± 2.7m ± 2.7m−1。考虑到在光照良好的浅水水域其他姬松茸的适度增长速度,这些深水增长速度出人意料地高,表明了专门的生理学,并有助于改变中游珊瑚生态系统光生态的传统范式。Leptoserisspp.的薄板状群体主导着整个印度-太平洋下光区的珊瑚群落,主要是径向生长的,随着时间的推移似乎没有明显的增厚。在较低的光区,这种生长策略以最小的钙化最大化表面积,从而使细毛虫能够比厚钙化物种更快地扩大平面区域。光合作用和生长效率也可能因为它们骨骼的光学几何形状、更多地获得无机营养物质和较低的深海温度而得到促进。这些强劲的增长率对MCE栖息地在受到干扰时的恢复潜力具有重要影响。
The ecology of phototrophic corals in the lower photic zone remains poorly understood. Studies to date indicate that growth rates generally decrease as available light attenuates with depth and are very slow at depths > 40 m. Here, we provide detailed evidence for moderate growth for obligate zooxanthellate corals at extreme depths. Using reliable U–Th dating techniques,Leptoserisspp. from 70 to 110 m in Hawaii were determined to grow (linear extension) from 8.0 ± 3.0 to 24.6 ± 2.7 mm yr−1. Given the modest growth rates of other agariciids in well-lit shallow waters, these deep-water growth rates are unexpectedly high, suggest specialized physiology and help alter the traditional paradigm on photo-ecology in mesophotic coral ecosystems. The thin plate-like colonies ofLeptoserisspp., which dominate the coral community in the lower photic zone throughout the Indo-Pacific, primarily grow radially and do not appear to appreciably thicken over time. In the lower photic zone, this growth strategy maximizes surface area with minimal calcification, thereby enablingLeptoseristo expand planar area more quickly than thickly calcified species. Photosynthetic and growth efficiencies may also be facilitated by the optical geometry of their skeletons, increased access to inorganic nutrients and cooler temperatures at depth. These robust growth rates have important implications on the recovery potential of MCE habitat in the event of disturbance.
北太平洋副热带环流光合作用的时间和垂直变化
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