Resolving Estuarine Nitrogen Use by Phytoplankton Communities Using a Whole Ecosystem Tracer Approach

Resolving Estuarine Nitrogen Use by Phytoplankton Communities Using a Whole Ecosystem Tracer Approach
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使用整个生态系统示踪方法解决河口浮游植物群落的氮利用问题

DOI:
10.1007/s12237-021-00905-6
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发表时间:
2021
影响因子:
2.7
通讯作者:
Stauffer, Beth A.
Stauffer, Beth A.
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Babitch, Jaylyn W.;Nelson, James A.;Deegan, Linda A.;Sullivan, Hillary;Stauffer, Beth A.

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河口系统中不同浮游植物群落对营养物的利用及其对这些自然系统中物理和生物地球化学过程变化的响应是一个重要的正在进行的研究领域。在美国马萨诸塞州梅岛河口的盐沼溪中,采用全生态系统15 NO3 −示踪实验,测定了不同形态氮(N)在中潮至小潮周期中浮游植物功能群的吸收。我们定量了微浮游植物(20-200 μm; microP)、纳米浮游植物(3-20 μm; nanoP)和微微型浮游植物(< 3 μm; picoP)三组的生物量和δ 15 N。所有三个大小类显示出不同的使用循环N源在整个11天的采样期和最小的直接同化的15 NO3 −示踪剂。MicroP始终使用大量的小溪衍生的15 NH 4+,即使在小潮从硅藻-甲藻为主的社区(包括有害的属Alexandrum的成员)的转变。在小潮中期潮汐周期中,NanoP对15 NH 4+的使用增加,而picoP的使用减少。小潮期间,各大小组的生物量和NH 4+利用率(δ 15 N最高值)均达到最大值。这项研究表明,在河口的大小为基础的浮游植物群体之间的分区回收氮的使用,与不同的潮汐周期对每组的营养盐吸收的影响,并具有重要意义的河口营养盐循环中的不同浮游植物群落的作用。
The use of nutrients by diverse phytoplankton communities in estuarine systems, and their response to changes in physical and biogeochemical processes in these natural systems, is a significant ongoing area of research. We used a whole ecosystem15NO3−tracer experiment to determine the uptake of different nitrogen (N) forms in phytoplankton functional groups over a mid- to neap tidal cycle in a salt marsh creek in Plum Island Estuary, Massachusetts, USA. We quantified the biomass and δ15N for three groups corresponding to micro- (20–200 μm; microP), nano- (3–20 μm; nanoP), and picophytoplankton (< 3 μm; picoP). All three size classes showed distinct use of recycled N sources throughout the 11-day sampling period and minimal direct assimilation of the15NO3−tracer. MicroP consistently used high amounts of creek-derived15NH4+, even with a shift at neap tide from diatom- to dinoflagellate-dominated communities (including members of the harmful genusAlexandrium). NanoP use of recycled15NH4+increased over the mid-neap tidal cycle, while picoP use decreased. Both biomass and NH4+use (as highest δ15N values) of all size groups were maximized during neap tide. This study demonstrates partitioning of recycled N use among size-based phytoplankton groups in the estuary, with distinct effects of tidal cycle on the nutrient uptake of each group, and with important implications for the roles of diverse phytoplankton communities in estuarine nutrient cycling.
DOI: 10.1007/s12237-015-9949-z
发表时间: 2015-11-01
期刊: Estuaries and coasts : journal of the Estuarine Research Federation
影响因子: --
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