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首页> 外文期刊>Polar biology >The Role Of Platelet Ice Microalgae In Seeding Phytoplankton Blooms In Terra Nova Bay (ross Sea, Antarctica): A Mesocosm Experiment
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The Role Of Platelet Ice Microalgae In Seeding Phytoplankton Blooms In Terra Nova Bay (ross Sea, Antarctica): A Mesocosm Experiment

机译：血小板冰微藻类在Terra Nova湾（南极罗斯海）浮游植物开花中的作用：中观实验

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摘要

The aim of this study was to assess the role of platelet ice microalgal communities in seeding pelagic blooms. Nutrient dynamics, microalgal biomass, photosyn-thetic parameters, cell densities and species succession were studied in two mesocosm experiments, designed to simulate the transition of microalgal communities from platelet ice habitat to pelagic conditions. The microalgal assemblages were dominated by diatoms, 70% of which were benthic species such as Amphiprora kufferathii, Nitzschia stellata, and Berkeleya adeliensis. Photoacclimation of benthic species was inadequate also at relatively low irradiances. Exceptional growth capacity at different light levels was observed for pelagic species such as Fragilariopsis cylindrus and Chaetoceros spp. which may be important in seeding blooms at ice breakup. Fragilariopsis cylindrus showed high growth rates both at 65 and 10% of incident light and in nutrient replete as well as in nutrient depleted conditions. Five days after inoculation, phytoplankton biomass increased and nutrient concentrations decreased in both light conditions. Nutrient uptake rates were up to 9.10 μmol L~(-1) d~(-1) of TIN in the high light tank and 6.18 μmol L~(-1) d~(-1) in the low light tank and nutrient depletion in the high light tank occurred 3 days prior to depletion in the low light tank. At nutrient depletion, biomass concentrations were similar in both tanks, 30 and 34 μg Chla L~(-1).
机译：这项研究的目的是评估血小板冰微藻群落在中上层水华种子播种中的作用。在两个介观实验中研究了营养动力学，微藻生物量，光合参数，细胞密度和物种演替，旨在模拟微藻群落从血小板冰生境向中上层环境的过渡。微藻组合以硅藻为主，其中70％是底栖生物，例如Amphiaprora kufferathii，Nitzschia stellata和Berkeleya adeliensis。在相对较低的辐照度下，底栖生物的光驯化也不充分。对于中上层物种，例如Fragilariopsis cylindrus和Chaetoceros spp，观察到了在不同光照水平下的出色生长能力。这对于在冰破裂时播种花朵很重要。圆头柏在65％和10％的入射光下以及在营养丰富和营养枯竭的条件下均显示出高生长速率。接种五天后，在两种光照条件下，浮游植物的生物量均增加而养分浓度降低。高光罐中的养分吸收率高达9.10μmolL〜（-1）d〜（-1），低光罐中的养分吸收率高达6.18μmolL〜（-1）d〜（-1）高光箱中的细菌在低光箱中耗尽之前3天发生。在营养耗尽时，两个罐中的生物量浓度相似，分别为30和34μgChla L〜（-1）。

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