Seasonal patterns of tissue biomass and densities of symbiotic dinoflagellates in reef corals and relation to coral bleaching
Seasonal patterns of tissue biomass and densities of symbiotic dinoflagellates in reef corals and relation to coral bleaching
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DOI：
10.4319/lo.2000.45.3.0677
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发表时间：
2000-05-01
影响因子：
4.5
通讯作者：
Chilcoat, GC
中科院分区：
文献类型：
--
作者：
Fitt, WK;McFarland, FK;Chilcoat, GC
在巴哈马三个不同深度对五种造礁珊瑚的组织生物量（无灰干重）和共生甲藻（密度、叶绿素a细胞（-1）或珊瑚表面积的厘米（-2））进行了长达4年的季节性监测。所有组织生物量和藻类共生体参数的最低值发生在夏末秋初采样期间。与此相反，共生体的最高密度和色素含量通常发生在冬季，而组织生物量最经常在春季达到峰值，时间滞后意味着这些变量之间的函数关系。生活在浅水中的珊瑚通常（但不总是）与较深的珊瑚相比，所有测量参数的水平都较高，但叶绿素a含量除外，通常显示相反的趋势。结果表明，所有深度的珊瑚每年都表现出漂白（共生甲藻和/或其色素的损失），无论它们在人眼看来是白色、棕褐色还是斑驳的。我们推测，这些模式是由藻类和动物生理学上的光照和温度的季节性变化驱动的。此外，我们假设，所有的热带造礁珊瑚，世界范围内，表现出类似的可预测的周期，在其组织生物量和共生藻类。
Tissue biomass (ash-free dry weight) and symbiotic dinoflagellates (density, chlorophyll a cell(-1) or cm(-2) of coral surface area) of five species of reef-building corals were monitored seasonally for up to 4 yr at three different depths in the Bahamas. The lowest values of all tissue biomass and algal symbiont parameters occurred during the late summer-fall sample periods. In contrast, the highest densities and pigment content of symbionts usually occurred during the winter, whereas tissue biomass peaked most often in the spring, the time lag implying a functional relationship between these variables. Corals living in shallow water often (but not always) had higher levels of all parameters measured compared to deeper corals, except chlorophyll a content, which usually displayed the opposite trend. The results show that corals from all depths exhibited bleaching (loss of symbiotic dinoflagellates and/or their pigments) every year, regardless of whether they appeared white, tan, or mottled to the human eye. We speculate that these patterns are driven by seasonal changes in light and temperature on algal and animal physiology. Furthermore, we hypothesize that all tropical reef-building corals, world-wide, exhibit similar predictable cycles in their tissue biomass and symbiotic algae.