Influence of land development on Holocene Porites coral calcification at Nagura Bay, Ishigaki Island, Japan.
Influence of land development on Holocene Porites coral calcification at Nagura Bay, Ishigaki Island, Japan.
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DOI：
10.1371/journal.pone.0088790
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Yamano H
中科院分区：
文献类型：
--
作者：
Sowa K;Watanabe T;Kan H;Yamano H
为了评估珊瑚钙化、热应力和河流排放对人类影响(以下称为“陆地开发”)造成的沉积和富营养化之间的关系，我们分析了由现代和化石(分别为1.2卡和3.5卡的KYR BP)中的地球化学信号重建的古环境中的生长特征，以及来自永仓湾(Nagura)的块状Porite珊瑚(“Nagura”)和来自Shiraho Reef Todoroki河口的现代Porite珊瑚(“Todoroki”)。这两个地点都位于日本石垣岛，名仓位于鸟取市以西约12公里处。在Nagura，单个珊瑚提供了13(现代)、10(1.2卡基尔BP)和38年长(3.5卡基尔BP)的时间窗口。在这里，我们给出了长仓和鸟岗珊瑚的年钙化，以及(双)月分辨记录的锶/钙(海表面温度(SST)的替代物)和巴/钙(与陆地开发有关的沉积物和营养物质的替代物)的记录。在Nagura，1.2卡KYR BP的冬季海温降低了2.8℃，3.5卡KYR BP的年和冬季SST分别降低了2.6℃和4.6℃。现代珊瑚中Ba/Ca的年周期与河流流量有关，与包括甘蔗种植在内的土地开发有关。现代珊瑚钙化作用也随着SST变暖和冬季BA/Ca峰值的增加而下降。然而，化石珊瑚的钙化似乎没有受到锶/钙和巴/钙变化的影响。Nagura和Todoroki的现代珊瑚生长特征表明，珊瑚的生长在空间和时间上都受到河流流量和土地开发的影响。在Nagura，我们的研究结果表明，由于收获甘蔗，土地开发导致冬季钙化的热敏感性为负，这是一种特定的现代现象。
To evaluate the relationships between coral calcification, thermal stress, and sedimentation and eutrophication linked to human impact (hereafter referred to as “land development”) by river discharge, we analyzed growth characteristics in the context of a paleoenvironment that was reconstructed from geochemical signals in modern and fossil (1.2 cal kyr BP and 3.5 cal kyr BP, respectively) massive Porites corals from Nagura Bay (“Nagura”) and from modern Porites corals from the estuary of the Todoroki River, Shiraho Reef (“Todoroki”). Both sites are on Ishigaki Island, Japan, and Nagura is located approximately 12 km west of Todoroki. At Nagura, the individual corals provide time windows of 13 (modern), 10 (1.2 cal kyr BP), and 38 yr in length (3.5 cal kyr BP). Here, we present the coral annual calcification for Nagura and Todoroki, and (bi) monthly resolved records of Sr/Ca (a proxy of sea surface temperature (SST)) and Ba/Ca (a proxy of sedimentation and nutrients related to land development) for Nagura. At Nagura, the winter SST was cooler by 2.8°C in the 1.2 cal kyr BP, and the annual and winter SSTs in the 3.5 cal kyr BP were cooler by 2.6°C and 4.6°C, respectively. The annual periodicity of Ba/Ca in modern coral is linked to river discharge and is associated with land development including sugar cane cultivation. Modern coral calcification also has declined with SST warming and increasing Ba/Ca peaks in winter. However, calcification of fossil corals does not appear to have been influenced by variations in Sr/Ca and Ba/Ca. Modern coral growth characteristics at Nagura and Todoroki indicate that coral growth is both spatially and temporally influenced by river discharge and land development. At Nagura, our findings suggest that land development induces negative thermal sensitivity for calcification in winter due to sugar cane harvest, which is a specifically modern phenomenon.
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