• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Sub-weekly coral linear extension measurements in a coral reef
【24h】

Sub-weekly coral linear extension measurements in a coral reef

机译：珊瑚礁中的每周珊瑚线性延长测量

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Coral growth rates are often used as a metric of coral health and are measured extensively in the laboratory under controlled conditions to better understand the potential impacts of future climate change scenarios. However, in the field, corals live in dynamic environments, which can be subjected to multiple types of stressors that can not be mimicked in the laboratory. Furthermore, the temporal scales over which many environmental conditions can vary in the reef, such as extreme temperature anomalies, tidal fluctuations, and point source pollution events are far shorter than most field estimates of coral growth, which are generally at annual or seasonal scales. To measure the impact to coral growth of environmental variables that vary on time scales of less than a year or a few months requires developing new growth measurement techniques. With the goal of measuring coral growth at sub-weekly scales in the field, we developed a technique to measure 5-day linear extension growth rates. We tested our approach on colonies of Acropora hyacinthus living in a shallow back-reef ecosystem with routine extreme daily fluctuations in temperature, pH, and dissolved oxygen saturation. Using serial skeletal staining and petrographic thin sectioning we measured linear extension in A. hyacinthus during three consecutive 5-day growth periods that had differing amounts of environmental variability. At our field site in American Samoa, the second growth period had the largest tidal swings, resulting in higher variability: within a day temperature ranged up to 5.4 degrees C (reaching a maximum of 31.9 degrees C) and pH ranged up to 0.41 units (with a minimum of pH 7.78). We tested whether corals are able to maintain even linear extension rates across these short periods of time or not. After confocal microscopy analysis of stained skeletal samples we found that linear extension rates were similar across the three growth periods. Our fine-scale measurements suggest that during periods with different magnitudes of tidally driven environmental variability, but constant mean conditions, short-term linear extension growth rates remain consistent.
机译：珊瑚增长率通常被用作珊瑚健康的指标，并在受控条件下广泛测量，以更好地了解未来气候变化情景的潜在影响。然而，在该领域中，珊瑚生活在动态环境中，这可以受到多种类型的压力源，这些压力源不能在实验室中模仿。此外，许多环境条件可以在珊瑚礁中变化的时间尺度，例如极端温度异常，潮汐波动和点源污染事件的珊瑚巨大估计远短于珊瑚增长，这通常是在年度或季节性尺度上。为了测量对不到一年或几个月的时间尺度变化的环境变量对珊瑚生长的影响需要开发新的增长测量技术。通过衡量现场亚每周鳞片尺度的珊瑚延长的目标，我们开发了一种测量5天线性延长增长率的技术。我们测试了我们在古老的背礁生态系统中的Acropora Hyacinthus菌落中的方法，常规每天在温度，pH和溶解氧饱和度下的常规每日波动。使用连续骨骼染色和岩体薄切片我们在连续三个5天生长期间测定了葫芦岛的线性延伸，其具有不同的环境变异性。在美国萨摩亚的田野现场，第二个增长期具有最大的潮汐摇摆，导致变化更高：在一天内温度范围内高达5.4摄氏度（最多31.9摄氏度）和pH值高达0.41单位（至少pH 7.78）。我们测试了珊瑚是否能够在这些短时间内维持甚至线性扩展速率。染色骨骼样品的共聚焦显微镜分析，我们发现在三个生长期横跨线性延伸率相似。我们的微尺度测量表明，在具有不同幅度的环境变异性的时期期间，但恒定的平均条件，短期线性延伸生长率保持一致。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号