The Aquila Digital Community The Aquila Digital Community Seasonal Phytoplankton Blooms in the North Atlantic Linked to Seasonal Phytoplankton Blooms in the North Atlantic Linked to the Overwintering Strategies of Copepods the Overwintering Strategies of Copepods
The Aquila Digital Community The Aquila Digital Community Seasonal Phytoplankton Blooms in the North Atlantic Linked to Seasonal Phytoplankton Blooms in the North Atlantic Linked to the Overwintering Strategies of Copepods the Overwintering Strategies of Copepods
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天鹰座数字社区 天鹰座数字社区 北大西洋季节性浮游植物大量繁殖与北大西洋季节性浮游植物大量繁殖与桡足类越冬策略相关 桡足类越冬策略
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C. Pearl
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作者：
C. Pearl
北大西洋包含不同的模式的季节性浮游植物水华与独特的内部动态。我们利用遥感叶绿素a浓度数据和变点统计分析了水华。一年中的第一次开花在低纬度地区的春季开始，在高纬度地区的夏季开始。在春季开花频率高的地区（即，（在发现水华的年份中所占的比例），水华的时间和持续时间之间呈负相关，表明早期水华持续的时间更长。在东北大西洋的大部分地区，水华的发展在多个季节中延伸，导致夏季叶绿素浓度达到峰值。研究发现，春季水华开始日与春季物候指数呈正相关，与不同地区的海表温度和北大西洋涛动呈正相关和负相关。根据春季和夏季水华的特点，北大西洋可以分为两个区域：一个是季节性水华区域，其明确的水华仅限于一个季节;另一个是多季节性水华区域，其水华在多个季节延伸。这些地区不同的开花开始和持续时间之间的相关性，只有季节性开花地区表现出显着的，负相关。我们检验了一个假设，即经历滞育的桡足类（Calanus finmarchicus，C。helgolandicus，C. glacialis和C. hyperboreus）可能有助于两个区域之间的水华发展的对比。这些哲水蚤桡足类的后期阶段的近地表春季丰度峰值一般与具有明确定义的季节性水华的地区有关，这意味着水华形状和它们的丰度之间存在联系。我们认为，放牧是形成季节性水华的一个因素，或者水华形状决定了栖息地是否有利于滞育，同时认识到这两个因素可以相互加强。
The North Atlantic Ocean contains diverse patterns of seasonal phytoplankton blooms with distinct internal dynamics. We analyzed blooms using remotely-sensed chlorophyll a concentration data and change point statistics. The first bloom of the year began during spring at low latitudes and later in summer at higher latitudes. In regions where spring blooms occurred at high frequency (i.e., proportion of years that a bloom was detected), there was a negative correlation between bloom timing and duration, indicating that early blooms last longer. In much of the Northeast Atlantic, bloom development extended over multiple seasons resulting in peak chlorophyll concentrations in summer. Spring bloom start day was found to be positively correlated with a spring phenology index and showed both positive and negative correlations to sea surface temperature and the North Atlantic Oscillation in different regions. Based on the characteristics of spring and summer blooms, the North Atlantic can be classified into two regions: a seasonal bloom region, with a well-defined bloom limited to a single season; and a multi-seasonal bloom region, with blooms extending over multiple seasons. These regions differed in the correlation between bloom start and duration with only the seasonal bloom region showing a significant, negative correlation. We tested the hypothesis that the near-surface springtime distribution of copepods that undergo diapause ( Calanus finmarchicus , C. helgolandicus , C. glacialis , and C. hyperboreus ) may contribute to the contrast in bloom development between the two regions. Peak near-surface spring abundance of the late stages of these Calanoid copepods was generally associated with areas having a well-defined seasonal bloom, implying a link between bloom shape and their abundance. We suggest that either grazing is a factor in shaping the seasonal bloom or bloom shape determines whether a habitat is conducive to diapause, while recognizing that both factors can re-enforce each other.