Intermittent upwelling and subsidized growth of the scleractinian coral Madracis mirabilis on the deep fore-reef slope of Discovery Bay, Jamaica
Intermittent upwelling and subsidized growth of the scleractinian coral Madracis mirabilis on the deep fore-reef slope of Discovery Bay, Jamaica
复制标题
牙买加愉景湾前礁深坡上石珊瑚 Madracis mirabilis 的间歇性上升和补贴生长
DOI：
10.3354/meps316095
复制
发表时间：
2006
影响因子：
2.5
通讯作者：
S. Genovese
中科院分区：
文献类型：
--
作者：
J. Leichter;S. Genovese
在牙买加北岸的45米深度梯度上进行了一项为期1年的研究，以探讨与温跃层振荡相关的深度特异性变化影响石珊瑚Madracis mirabilis生长速率的假设。在30至55 m深度检测到多个周期的高频温度变化，表明亚温跃层水以半日和较短的间隔垂直输送到礁坡。冷却，表示为低于深度平均日温度的累积度日数，从10 m处的1.6°C d增加到45和55 m深度处的50°C d。从10米到55米，日温差之和从3.7 °C 2增加到9.9°C 2，几乎增加了3倍。珊瑚的生长率随深度呈双峰分布，在10和30 m处生长最快（3.86 - 4.12 g yr-1），在20和45 m处生长减慢（2.46 - 3.21 g yr-1），在55 m处生长最慢（0.97 g yr-1）。为了评估内波强迫强度不同的地点之间可能存在的差异，M。在20和30米深的牙买加与以前的结果从佛罗里达群岛进行了比较。总体增长率更大，在佛罗里达比在牙买加，对应于更大的内波活动在佛罗里达，并在30米的增强增长的类似效果，观察到在这两个网站。温跃层的垂直振荡是一种普遍现象，可能有助于各种深礁环境中的珊瑚生长模式。
A 1 yr study was conducted across a 45 m depth gradient on the north shore of Jamaica to explore the hypothesis that depth-specific variability associated with thermocline oscillations effects growth rates of the scleractinian coral Madracis mirabilis. Multiple periods of high-frequency temperature variability were detected at 30 to 55 m depth, indicative of vertical transport of subther- mocline water onto the reef slope at semidiurnal and shorter intervals. Cooling, expressed as cumu- lative degree-days below the depth-averaged daily temperature increased from 1.6°C d at 10 m to 50°C d at 45 and 55 m depth. The sum of the daily temperature variance increased almost 3-fold from 3.7 to 9.9°C 2 from 10 to 55 m. Coral growth rates showed a bimodal distribution as a function of depth, with fastest growth (3.86 to 4.12 g yr -1 ) at 10 and 30 m, reduced growth (2.46 to 3.21 g yr -1 ) at 20 and 45 m, and slowest growth (0.97 g yr -1 ) at 55 m. To assess possible differences among sites differing with respect to the intensity of internal-wave forcing, growth rates of M. mirabilis were compared at 20 and 30 m depth in Jamaica with previous results from the Florida Keys. Overall growth rates were greater in Florida than in Jamaica, corresponding to greater internal-wave activity in Florida, and a similar effect of enhanced growth at 30 m was observed at both sites. Vertical oscillations of the thermocline are a widespread phenomenon, and may contribute to patterns of coral growth in a variety of deep reef environments.