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首页> 外文期刊>Marine ecology progress series >Biogeographic variation in temperature drives performance of kelp gametophytes during warming
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Biogeographic variation in temperature drives performance of kelp gametophytes during warming

机译：温度的生物地理变化驱动海带配子体变暖的性能

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摘要

The capacity for thermal adjustment or adaptation is critical to population persistence in a warming ocean. Understanding such performance across a species' range can give insights into the extent of possible adjustment as well as spatial variation in vulnerability. This study tested the effects of temperature on the density and size of gametophytes of the habitat-forming kelp Ecklonia radiata, across its Australian distribution (between ～9° and ～33° S). Gametophytes from warm, intermediate and cool biogeographic regions were cultured over a temperature gradient from 12 to 26℃, revealing optimum temperatures of ～18 to 23℃-well above current maximum temperatures in parts of the range - and a positive relationship between in situ temperature and thermal optima for performance. Optimum temperatures in warmer regions were more than 1℃ higher than in cooler regions. Biogeographically, the thermal optima for gametophytes were more strongly linked to long-term temperature characteristics of a region (annual extremes, 3 yr range) than short-term variation (mean for the month prior) in sea temperature. These results document that present-day populations of E. radiata have adjusted their gametophyte thermal sensitivity according to their local environment, and further indicate that these differences are adaptive rather than phenotypic. Collectively, these findings suggest that the scope for thermal adaptation and gametophyte performance of E. radiata across most of its Australian distribution is within projected levels of future warming.
机译：热调节或适应能力对于变暖的海洋中的种群持续生存至关重要。了解整个物种范围内的这种表现可以洞悉可能的调整程度以及脆弱性的空间变化。这项研究测试了温度对整个栖息地形成的海带Ecklonia radiata的配子体的密度和大小的影响，分布范围为〜9°至〜33°S。在12至26℃的温度梯度上培养了来自温暖，中间和凉爽的生物地理区域的配子体，揭示了最佳温度〜18至23℃-远高于该范围内部分地区当前的最高温度-且原位温度之间存在正相关和热性能最佳。温暖地区的最佳温度比凉爽地区的最高温度高出1℃以上。在生物地理学上，配子体的热最适性与某个区域的长期温度特征（年度极端值，3年范围）的联系比海上温度的短期变化（前一个月的平均值）更紧密。这些结果表明，当今的辐射大肠埃希菌种群已根据其当地环境调整了配子体热敏感性，并进一步表明这些差异是适应性的而非表型。总的来说，这些发现表明，辐射大肠菌在澳大利亚大部分地区的热适应能力和配子体表现范围都在未来变暖的预计水平之内。

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  • 来源
    《Marine ecology progress series》 |2014年第22期|85-96|共12页
  • 作者

    Margaret B. Mohring; Thomas Wernberg; Jeffrey T. Wright; Sean D. Connell; Bayden D. Russell;

  • 作者单位

    School of Plant Biology & UWA Oceans Institute (M096), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;

    School of Plant Biology & UWA Oceans Institute (M096), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia,Australian Institute of Marine Science, 39 Fairway, Crawley, Western Australia 6009, Australia;

    National Centre for Marine Conservation and Resource Sustainability, Australian Maritime College, University of Tasmania, PO Box 986, Launceston, Tasmania 7250, Australia;

    Southern Seas Ecology Laboratories, School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia;

    Southern Seas Ecology Laboratories, School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Adaptation; Ecotype; Growth; Ocean warming; Survival; Thermal optima;

    机译：适应;生态型成长;海洋变暖;生存;热最优;

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