Phytoplankton phenology indices in coral reef ecosystems: Application to ocean-color observations in the Red Sea
Phytoplankton phenology indices in coral reef ecosystems: Application to ocean-color observations in the Red Sea
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DOI：
10.1016/j.rse.2015.01.019
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发表时间：
2015-04-01
影响因子：
13.5
通讯作者：
Hoteit, Ibrahim
中科院分区：
文献类型：
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作者：
Racault, Marie-Fanny;Raitsos, Dionysios E.;Hoteit, Ibrahim
浮游植物是海洋食物网的基础，是珊瑚礁生态系统的基本食物来源。浮游植物生物量的时间（物候）和大小是营养相互作用的主要决定因素。红海是世界上最温暖和含盐最多的盆地之一，其特点是受季风调节的干旱热带气候。这些极端条件对海洋生物来说尤其具有挑战性。浮游植物物候指数是表征浮游植物季节性的客观定量指标。本文利用欧洲空间局（ESA）气候变化倡议项目（OC-CCI）在整个红海盆地15年（1997-2012年）的遥感海洋颜色数据，估算了开始、峰值、终止和持续时间等指数。OC-CCI产品包括三个独立海洋颜色传感器（SeaWiFS、MODIS和MERIS）的合并和偏差校正观测数据，并使用聚合物算法（MERIS期间）进行处理，显示叶绿素数据覆盖范围显着增加，特别是在夏季西北季风月份的红海南部。在开阔水域和靠近珊瑚礁的沿海水域，OC-CCI叶绿素数据的性能可与全球海洋中其他标准叶绿素产品的性能相媲美。这些特征使我们能够研究整个红海盆地以及冬季东南季风和夏季西北季风时期的浮游植物物候。物候指数在盆地的四个开放水域省份进行了估计，并在红海具有特别社会经济重要性的六个珊瑚礁群进一步进行了检查，包括Siyal群岛、Shams El Sheikh、Al Wajh银行、Thuwal珊瑚礁、Al Lith珊瑚礁和Farasan群岛。冬季（相对于夏季），大部分开阔水域和较深水域的叶绿素浓度明显较高，浮游植物生长持续时间也较长。相比之下，大多数靠近珊瑚礁的沿海水域在夏季（相对于冬季）表现出相同或更高的叶绿素峰值浓度和相同或更长时间的浮游植物生长。在生态系统状态评估的背景下，讨论了浮游植物季节特征的生态和生物学意义，特别是支持进一步了解红海珊瑚礁生态系统的结构和功能。(C) 2015年作者。Elsevier Inc.出版。
Phytoplankton, at the base of the marine food web, represent a fundamental food source in coral reef ecosystems. The timing (phenology) and magnitude of the phytoplankton biomass are major determinants of trophic interactions. The Red Sea is one of the warmest and most saline basins in the world, characterized by an arid tropical climate regulated by the monsoon. These extreme conditions are particularly challenging for marine life. Phytoplankton phenological indices provide objective and quantitative metrics to characterize phytoplankton seasonality. The indices i.e. timings of initiation, peak, termination and duration are estimated here using 15 years (1997-2012) of remote sensing ocean-color data from the European Space Agency (ESA) Climate Change Initiative project (OC-CCI) in the entire Red Sea basin. The OC-CCI product, comprising merged and bias-corrected observations from three independent ocean-color sensors (SeaWiFS, MODIS and MERIS), and processed using the POLYMER algorithm (MERIS period), shows a significant increase in chlorophyll data coverage, especially in the southern Red Sea during the months of summer NW monsoon. In open and reef-bound coastal waters, the performance of OC-CCI chlorophyll data is shown to be comparable with the performance of other standard chlorophyll products for the global oceans. These features have permitted us to investigate phytoplankton phenology in the entire Red Sea basin, and during both winter SE monsoon and summer NW monsoon periods. The phenological indices are estimated in the four open water provinces of the basin, and further examined at six coral reef complexes of particular socio-economic importance in the Red Sea, including Siyal Islands, Shams El Sheikh, Al Wajh bank, Thuwal reefs, Al Lith reefs and Farasan Islands. Most of the open and deeper waters of the basin show an apparent higher chlorophyll concentration and longer duration of phytoplankton growth during the winter period (relative to the summer phytoplankton growth period). In contrast, most of the reef-bound coastal waters display equal or higher peak chlorophyll concentrations and equal or longer duration of phytoplankton growth during the summer period (relative to the winter phytoplankton growth period). The ecological and biological significance of the phytoplankton seasonal characteristics are discussed in context of ecosystem state assessment, and particularly to support further understanding of the structure and functioning of coral reef ecosystems in the Red Sea. (C) 2015 The Authors. Published by Elsevier Inc.