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Bacterioplankton communities reveal horizontal and vertical influence of an Island Mass Effect
Environmental Microbiology ( IF 5.1 ) Pub Date : 2022-06-12 , DOI: 10.1111/1462-2920.16092
Jacqueline Comstock 1 , Craig E Nelson 2 , Anna James 1 , Emma Wear 1 , Nicholas Baetge 1 , Kristina Remple 2 , Amethyst Juknavorian 3 , Craig A Carlson 1
Affiliation  

Coral reefs are highly productive ecosystems with distinct biogeochemistry and biology nestled within unproductive oligotrophic gyres. Coral reef islands have often been associated with a nearshore enhancement in phytoplankton, a phenomenon known as the Island Mass Effect (IME). Despite being documented more than 60 years ago, much remains unknown about the extent and drivers of IMEs. Here we utilized 16S rRNA gene metabarcoding as a biological tracer to elucidate horizontal and vertical influence of an IME around the islands of Mo′orea and Tahiti, French Polynesia. We show that those nearshore oceanic stations with elevated chlorophyll a included bacterioplankton found in high abundance in the reef environment, suggesting advection of reef water is the source of altered nearshore biogeochemistry. We also observed communities in the nearshore deep chlorophyll maximum (DCM) with enhanced abundances of upper euphotic bacterioplankton that correlated with intrusions of low-density, O2 rich water, suggesting island influence extends into the DCM.

中文翻译:

浮游细菌群落揭示了岛屿质量效应的水平和垂直影响

珊瑚礁是高产生态系统,具有独特的生物地球化学和生物学,位于非生产性贫营养环流中。珊瑚礁岛屿通常与近岸浮游植物的增加有关,这种现象被称为岛屿质量效应 (IME)。尽管在 60 多年前就有了记录,但关于 IME 的范围和驱动因素仍有许多未知之处。在这里,我们利用 16S rRNA 基因元条形码作为生物示踪剂来阐明 IME 在法属波利尼西亚莫雷亚岛和塔希提岛周围的水平和垂直影响。我们表明,那些叶绿素a升高的近岸海洋站包括在珊瑚礁环境中大量发现的浮游细菌,表明珊瑚礁水的平流是改变近岸生物地球化学的来源。我们还观察了近岸深层叶绿素最大值 (DCM) 中的群落,上层透光浮游细菌丰度增加,这与低密度、富含 O 2的水的入侵相关,表明岛屿影响延伸到 DCM。
更新日期:2022-06-12
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