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首页> 外文期刊>Marine ecology >Growth rates and ecology of coralline rhodoliths from the Ras Ghamila back reef lagoon, Red Sea
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Growth rates and ecology of coralline rhodoliths from the Ras Ghamila back reef lagoon, Red Sea

机译：红海拉斯加米拉背礁泻湖中珊瑚纹菱纹石的生长速率和生态

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摘要

Rhodoliths are important marine carbonate producers that provide habitat for several marine organisms, and are threatened by ongoing global climate change. Meter-sized sedimentary patches rich in living rhodoliths, interspersed among corals, were discovered in the back reef of Ras Ghamila lagoon, Southern Sinai, at less than 1m water depth. In this shallow and relatively sheltered subtropical environment, rhodoliths were found to be monospecific or oligospecific, spheroidal, 3.5 to 9.4 cm in maximum diameter, with warty/lumpy or fruticose (protuberance degree IV) growth forms, and corresponded to the unattached branches or praline type. They grew in bright light under seasonal, moderate, wind-driven water motion. The dominant rhodolith-forming species recorded were: Lithophyllum kotschyanum, Porolithon onkodes, Hydrolithon sp. and three species of Neogoniolithon: Neogoniolithon fosliei, Neogoniolithon brassica-florida, and an undescribed species noted in the text as Neogoniolithon sp. A total of 38 Alizarin-stained rhodoliths was released in the field and collected after 1year. They showed different banding patterns (alternating long and short cells) that revealed seasonal growth, with the lowest rates occurring in winter for all species, and an additional summer growth slackening in Neogoniolithon fosliei. Lithophyllum kotschyanum presented evidence of occasional growth cessation, possibly due to temporary burial. The observed annual growth rate of rhodoliths was unrelated to their size. The mean accretion rates were 1.08mm·year−1 in L.kotschyanum, 0.75mm·year−1 in P.onkodes, 0.49mm·year−1 in Hydrolithon sp., 0.85mm mm·year−1 in N.fosliei, 0.63mm·year−1 in N. brassica-florida and 0.57mm·year−1 in Neogoniolithon sp. The annual mean marginal elongation rate for these taxa was respectively 8.74, 13.92, 3.59, 9.40 and 9.25mm·year−1, with the exception of Neogoniolithon sp., for which this parameter was not recorded. Maximum marginal elongation occurred in P.onkodes pointing out its greater ability as a space competitor in comparison with the other rhodolith species. The highest accretion rate and common presence of L.kotschyanum indicate its importance as carbonate producer in tropical reef.
机译：红景天属是重要的海洋碳酸盐生产商，为几种海洋生物提供栖息地，并受到全球气候变化的威胁。在西奈州南部拉斯·加米拉泻湖的后礁中，发现了水深不足1m的米级大小的富含斑纹石的沉积斑块，它们散布在珊瑚中。在这个相对较浅且相对庇护的亚热带环境中，发现菱纹石是单特异性或寡特异性的，球形，最大直径为3.5至9.4 cm，具有疣状/块状或果糖（突出度IV）的生长形式，并且对应于未附着的分支或果仁糖类型。在季节性，适度，风力驱动的水运动下，它们在明亮的光线下生长。记录的占优势的杜鹃石形成物种有：石斑石楠，Porolithon onkodes，Hydrolithon sp。以及三种新近新石器时代的物种：Neogoniolithon fosliei，Neogoniolithon Brassica-florida和文本中未描述的新近新石器物种。在田间总共释放了38种茜素染色的杜鹃花，并在1年后收集。他们显示出不同的带状分布模式（交替的长短细胞），揭示了季节性增长，所有物种冬季的发生率最低，而在新孢子虫中，夏季的增长有所减弱。小花石楠（Lithophyllum kotschyanum）提供了偶尔的停止生长的证据，可能是由于暂时的埋葬。观察到的年长石的年增长率与其大小无关。 L.kotschyanum的平均增生率为1.08mm·year-1，P.onkodes为0.75mm·year-1，Hydrolithon sp。为0.49mm·year-1，N.fosliei为0.85mmmm·year-1，芸NN.gonosalithon sp。中的0.63mm·year-1和Neogoniolithon sp。中的0.57mm·year-1。这些分类群的年平均边际伸长率分别为8.74、13.92、3.59、9.40和9.25mm·year-1，但Neogoniolithon sp。除外，该参数未记录。 P.onkodes发生了最大的边缘伸长，这表明与其他菱锰矿种相比，P.onkodes具有更强的空间竞争能力。 L.kotschyanum的最高繁殖率和普遍存在表明其作为热带礁碳酸盐生产者的重要性。

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