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Growth Rate of Stony Corals of Broward County, Florida: Effects from Past Beach Renourishment Projects

机译:佛罗里达州布劳沃德县石质珊瑚的增长率:过去海滩养育项目的影响

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摘要

The skeletal growth of hermatypic (reef-building) corals is a sensitive indicator of environmental conditions and perturbations. In particular, excessive sedimentation and turbidity act to depress coral growth because energy expenditure is required to remove sediment and because turbidity reduces light energy necessary for coral health and nutrition.Normalized annual growth (linear skeletal extension) rates of Broward County, Florida reef-building corals were over 16 years (1985-1970). Star corals (Montastrea annularis) and brain corals (Diploria labyrinthiformis) were collected from each of four reef sites at two depths (9m and 18m). Collection areas were located in the vicinity of possible adverse sedimentation/turbidity effects from one or more of six past beach renourishment projects.Coral growth differences among sites at particular years and among years within sites were statistically evaluated. Years tested included those of and subsequent to each of six past beach renourishment projects. The results are suggestive that, in general, Broward County beach renourishment projects have had minor or no influence on currently living off-shore corals.However, following the Hollywood-Hallandale renourishment project of 1979, D. labyrinthiformis from the Hollywood 18m site exhibited significantly lower normalized growth compared to other sites. This may not represent effects from the renourishment project. At the Hollywood site M. annularis from both 9m and 18m and D. labyrinthiformis from 9m did not exhibit significantly lowered growth in comparison to other sites.Site averages of absolute coral growth indicated that southern 9m specimens had higher rates of growth than northern counterparts for M. annularis. In the southern collection sites, 9m growth of both species tended to be greater than 18m growth.Correlation analysis indicated that the time pattern of coral growth is similar among sites, species, and depths. Comparison of time series of coral growth data to recorded environmental variables (temperature and salinity) revealed a positive relation with salinity (water density) variations.
机译:造血珊瑚的骨骼生长是环境状况和摄动的敏感指标。特别是过多的沉积和浊度会抑制珊瑚的生长,因为需要能量消耗才能去除沉积物,并且浊度会降低珊瑚健康和营养所需的光能。佛罗里达州布劳沃德县礁石建造的正常年增长率(线性骨骼扩展)率珊瑚超过16年(1985年至1970年)。从两个深度(9m和18m)的四个珊瑚礁地点中的每个地点收集了星状珊瑚(Montastrea ringis)和脑珊瑚(Diploria labyrinthiformis)。收集区位于过去六个海滩改造项目中的一个或多个可能对沉积/浊度造成不利影响的附近,对特定年份的地点之间以及地点内部年份之间的珊瑚生长差异进行统计评估。经过测试的年份包括过去六个海滩改造项目中的每个项目及其之后的年份。结果表明,总体而言,布劳沃德县海滩养育项目对目前生活的近海珊瑚影响很小或没有影响。然而,继1979年好莱坞-哈兰代尔养育计划之后,好莱坞18m场地的D. labyrinthiformis表现出显着性与其他网站相比,归一化增长率较低。这可能并不代表重新计划的效果。与其他地点相比,好莱坞的9m和18m处的环状圆环菌和9m的唇圆线虫均未表现出明显降低的生长速度。该地区的平均珊瑚绝对生长平均值表明,南部9m的标本的生长速率高于北部的标本。圆环肌在南部采集点,两个物种的9m生长趋向于大于18m。关联分析表明,不同位置,物种和深度的珊瑚生长时间模式相似。将珊瑚生长数据的时间序列与记录的环境变量(温度和盐度)进行比较,发现与盐度(水密度)变化呈正相关。

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