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The effects of temperature on the growth of juvenile scleractinian corals

机译：温度对幼小巩膜珊瑚生长的影响

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摘要

Tropical reef corals are well known for their sensitivity to rising temperature, yet surprisingly little is known of the mechanisms through which temperature acts on intact coral colonies. One such mechanism recently has been suggested by the association between the growth of juvenile corals and seawater temperature in the Caribbean, which suggests that temperature causes a transition between isometric and allometric growth scaling in warmer versus cooler years, respectively (Edmunds in Proc R Soc B 273:2275-2281, 2006). Here, this correlative association is tested experimentally for a cause-and-effect relationship. During April and May 2006, juvenile colonies (8-35 mm diameter) of massive Porites spp. from Moorea, French Polynesia, were incubated at warm (27.8℃) and cool (25.7℃) temperatures for 15 days, and their response assessed through the scaling of growth (change in weight) with colony size. The results reveal that the scaling of colony-specific growth (mg colony~(-1) day~(-1)) was unaffected by temperature, although growth absolutely was greater at the cool compared to the warm temperature, regardless of colony size. This outcome was caused by contrasting scaling relationships for area-specific growth (mg cm~(-2) day~(-1)) that were negatively allometric under warm conditions, but independent of size under cool conditions. In April 2007, a 22 days field experiment confirmed that the scaling of area-specific growth in juvenile Porites spp. is negatively allometric at a warm temperature of 29.5℃. Based on strong allometry for tissue thickness, biomass, and Symbiodinium density in freshly collected Porites spp., it is hypothesized that the temperature-dependency of growth scaling in these small corals is mediated by the interaction of temperature with biomass.
机译：热带礁珊瑚以其对温度升高的敏感性而闻名，但令人惊讶的是，人们对温度作用于完整珊瑚群落的机制知之甚少。加勒比海中的未成年珊瑚的生长与海水温度之间的关联最近提出了一种这样的机制，这表明温度分别在较暖和较冷的年份分别导致等距和异速生长比例之间的转换（Proc R Soc B中的Edmunds）。 273：2275-2281，2006）。在此，对这种相关性关联进行了因果关系实验测试。在2006年4月和2006年5月期间，大量的Porites菌属（spp。）出现了未成年人的群体（直径8-35 mm）。将来自法属波利尼西亚莫雷阿岛的羊在温热（27.8℃）和凉爽（25.7℃）的温度下孵育15天，并根据菌落大小随生长规模（体重变化）评估其反应。结果表明，菌落特异性生长的比例（mg菌落〜（-1）天〜（-1））不受温度的影响，尽管无论菌落大小如何，在凉爽的情况下生长绝对比在温暖的温度下更大。该结果是由特定区域生长的比例关系（mg cm〜（-2）天〜（-1））的对比关系所引起的，该比例关系在温暖条件下呈负等速分布，但在寒冷条件下与大小无关。 2007年4月，一项为期22天的田间实验证实，幼体Porites spp的特定区域生长规模不断扩大。在29.5℃的温暖温度下为负速溶。基于对刚采集的Porites物种中组织厚度，生物量和共生素密度的强变构关系，假设这些小珊瑚中生长鳞片的温度依赖性是由温度与生物量的相互作用介导的。

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  • 来源
    《Marine biology》 |2008年第1期|p.153-16116160162|共11页
  • 作者

    Peter J. Edmunds;

  • 作者单位

    Department of Biology, California State University, 18111 Nordhoff Street, Northridge, CA 91330-8303, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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