Observations of phytoplankton productivity and growth rates in the Malin shelf break environment

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY
Stuart C. Painter
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引用次数: 0

Abstract

The southern sector of the Malin Shelf, a subregion of the NW European Shelf, is noted for episodic and unimpeded incursions of oceanic water onto the shelf in an area where the northward flowing European slope current interacts with steep bathymetry, yet the in-situ biological consequences of these incursions are largely unexplored. In this study phytoplankton productivity, nitrate assimilation and community growth rates are presented to characterise in-situ biological conditions during a prominent chlorophyll bloom that occurred at the shelf break in July 2013. Surface waters were replete with nitrate (2–7 μmol L−1) and phosphate (0.1–0.4 μmol L−1) but deficient in silicate (Si < 1 μmol L−1). Chlorophyll concentrations were significantly negatively correlated with phosphate concentrations but not correlated with nitrate or silicate. High variability between stations in productivity, nitrate assimilation, and depth averaged phytoplankton community growth rates, which ranged from <0.01 to 0.14 d−1, could be attributed to subsurface gradients in production and biomass distributions. Though variable the magnitude of productivity rates in this sector of the Malin Shelf environment do not appear unusual relative to comparable observations suggesting that despite the uncommon physical conditions of the study site phytoplankton productivity was not significantly modified by proximity to oceanic influences.

马林大陆架断裂环境中浮游植物生产力和生长率的观测结果
马林大陆架南段是西北欧大陆架的一个子区域,在该区域,北流的欧洲坡流与陡峭的水深相互作用,导致大洋水时不时地畅通无阻地侵入大陆架。本研究介绍了浮游植物生产力、硝酸盐同化和群落生长率,以描述 2013 年 7 月大陆架断裂处叶绿素大量繁殖期间的原位生物条件。表层水富含硝酸盐(2-7 μmol L-1)和磷酸盐(0.1-0.4 μmol L-1),但缺乏硅酸盐(Si < 1 μmol L-1)。叶绿素浓度与磷酸盐浓度呈明显负相关,但与硝酸盐或硅酸盐无关。各站之间在生产力、硝酸盐同化和深度平均浮游植物群落生长率(从 0.01 到 0.14 d-1 不等)方面存在很大差异,这可能归因于生产和生物量分布的次表层梯度。尽管马林大陆架环境中这一区域的生产率不尽相同,但与同类观测结果相比并无异常,这表明尽管研究地点的物理条件并不常见,但浮游植物的生产率并没有因为靠近海洋影响而发生显著变化。
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来源期刊
Continental Shelf Research
Continental Shelf Research 地学-海洋学
CiteScore
4.30
自引率
4.30%
发文量
136
审稿时长
6.1 months
期刊介绍: Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.
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