Nutrient breakpoints for estuarine phytoplankton communities
Nutrient breakpoints for estuarine phytoplankton communities
复制标题
河口浮游植物群落的营养断点
DOI：
10.1002/lno.11570
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发表时间：
2020
影响因子：
4.5
通讯作者：
Smith, Erik M.
中科院分区：
文献类型：
--
作者：
Pinckney, James L.;Knotts, Eilea R.;Kibler, Krystyn J.;Smith, Erik M.
营养物质断裂点是浮游植物对营养物质负荷进一步增加的反应发生根本变化的浓度。其生态学含义是，营养断点标志着群落从相对稳定的状态过渡到交替或过渡状态，结构和功能都发生了显著变化。在两个不同的河口系统中，确定了总浮游植物群落和个体浮游植物群对溶解无机氮(DIN)浓度增加的响应的营养转折点。在高光照和低光照条件下，浮游植物暴露于增加的N添加情景(0-100molμDIN L−1)中。在实验生物测定中，在培养72小时后，确定了藻类总生物量、藻类群多样性和单个藻类群的响应。低盐度河口的浮游植物表现出比高盐度河口更高的DIN断点(>；双倍)，而光照(20%比40%的环境)不影响断点。DIN的添加改变了藻类群的多样性，但群落相似性为80%； 。我们的结果表明，环境中的DIN浓度不应超过断点浓度，以防止从稳定状态到过渡状态或交替状态的可能转变。对于高盐度河口和低盐度河口，DIN阈值分别为25和50μ L−1。这些水平应能减轻这两个河口系统浮游植物群落结构和功能发生重大变化的风险。
Nutrient breakpoints are the concentration at which there is a fundamental change in phytoplankton responses to further increases in nutrient loading. The ecological implication is that nutrient breakpoints signal a community transition from a relatively stable state to an alternate or transition state with marked changes in structure and, by extension, function. Nutrient breakpoints for the total phytoplankton community and individual phytoplankton groups in response to increases in dissolved inorganic nitrogen (DIN) concentrations were determined for two contrasting estuarine systems. Phytoplankton were exposed to increasing N addition scenarios (0–100μmol DIN L−1) under high and low irradiance conditions. Responses of total algal biomass, group diversity, and individual algal groups were determined after 72‐h incubations in experimental bioassays. Phytoplankton from the low‐salinity estuary exhibited higher DIN breakpoints (>double) than the high‐salinity estuary while irradiance (20% vs. 40% of ambient) did not affect breakpoints. DIN additions changed algal group diversity, but community similarities were > 80%. Our results suggest that ambient DIN concentrations should not exceed breakpoint concentrations to prevent possible shifts from a stable to a transitional or alternate state. DIN thresholds should be 25 and 50μmol L−1for the high‐ and low‐salinity estuaries, respectively. These levels should mitigate the risk of major alterations in phytoplankton community structure and function in these two estuarine systems.
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