IFREMER, Centre de Brest, Department Dynam. Environm. Cotier, F-29280 Plouzane, France.
IFREMER, Centre de Brest, Department Dynam. Environm. Cotier, F-29280 Plouzane, France.
Harmful Algae. 2016 Mar;53:53-63. doi: 10.1016/j.hal.2015.11.016. Epub 2016 May 3.
The frequency and distribution of high biomass blooms produced by two dinoflagellate species were analysed along the French continental shelf from 1998 to 2012. Two species were specifically studied: Karenia mikimotoi and Lepidodinium chlorophorum. Based on remote-sensing reflectances at six channels (410, 430, 480, 530, 550 and 670nm), satellite indices were created to discriminate the species forming the blooms. A comparison with observations showed that the identification was good for both species in spite of a lower specificity for L. chlorophorum. The overall analysis of the satellite indices, in association with some monitoring data and cruise observations, highlights the regularity of these events and their extent on the continental shelf. L. chlorophorum blooms may occur all along the South Coast of Brittany. All the coastal areas under the influence of river plumes and the stratified northern shelf area of the Western English Channel appear to be areas of bloom events for both species. These two species are likely to be in competitive exclusion as they share the same spatial distribution and the timing of their bloom is very close. Finally, due to the scarcity of off-shore observations, these satellite indices provide useful information regarding HABs management and the development of a warning system along the French coast.
从 1998 年到 2012 年，对法国大陆架上两种甲藻产生的高生物量水华的频率和分布进行了分析。特别研究了两种物种：米氏凯伦藻和绿色鞭毛藻。基于六个通道（410、430、480、530、550 和 670nm）的遥感反射率，创建了卫星指数来区分形成水华的物种。与观测结果的比较表明，两种物种的识别都很好，尽管绿色鞭毛藻的特异性较低。对卫星指数的总体分析，结合一些监测数据和巡航观测，突出了这些事件的规律性及其在大陆架上的范围。绿色鞭毛藻水华可能发生在布列塔尼南岸的整个地区。所有受河流羽流影响的沿海地区和西英吉利海峡北部的分层大陆架地区似乎都是两种物种水华事件的发生地。这两个物种可能处于竞争排斥状态，因为它们具有相同的空间分布，而且它们的繁殖时间非常接近。最后，由于缺乏近海观测，这些卫星指数为法国沿海地区的赤潮管理和预警系统的发展提供了有用的信息。
