Compound-specific δ15N amino acid measurements in littoral mussels in the California upwelling ecosystem: a new approach to generating baseline δ15N Isoscapes for coastal ecosystems.
Compound-specific δ15N amino acid measurements in littoral mussels in the California upwelling ecosystem: a new approach to generating baseline δ15N Isoscapes for coastal ecosystems.
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加利福尼亚上升生态系统中沿海贻贝中的复合特异性Δ15N氨基酸测量：生成沿海生态系统的基线Δ15N等轴心的新方法。
DOI：
10.1371/journal.pone.0098087
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
McCarthy MD
中科院分区：
文献类型：
--
作者：
Vokhshoori NL;McCarthy MD
本文对滤食性潮间带贻贝(Mytilus californianus) δ15N化合物特异性氨基酸同位素数据（CSI-AA）进行了研究，为构建沿海初级生产一体化等景观提供了一种新方法。我们研究了加利福尼亚上升流生态系统（CUE）的空间δ15N梯度，测定了俄勒冈州奥福德港和加利福尼亚州拉霍亚之间28个地点贻贝组织的总体δ15N值，并在选定的地点应用CSI-AA来分离食物网底部同位素值对营养效应的影响。体积δ15N值随纬度呈较强的线性趋势，从北到南逐渐增大（从~ 7‰到~ 12‰，R2 = 0.759）。相比之下，CSI-AA的营养位置估计与纬度没有相关性。因此，δ15N趋势与基线δ15N梯度最为一致，这可能是由于两种源水的混合：来自向南流动的加利福尼亚表层流的低δ15N硝酸盐，以及加利福尼亚潜流（CUC）向北输送的富含15n的硝酸盐。这一解释得到了苯丙氨酸δ15N值类似线性梯度的有力支持，苯丙氨酸（δ15NPhe）是基线δ15N值的最佳AA代理。我们假设潮间带贻贝的δ15NPhe值可以近似于沿海浮游植物初级生产的年综合δ15N值。因此，我们使用δ15NPhe值生成了东北太平洋沿海地区第一个特定于化合物的氮等值图，该等值图表明沿海初级生产δ15N值具有显著的线性梯度。我们认为，滤食性动物的δ15NPhe等值图可以直接表征主要生化省的δ15N基线值，在了解顶级捕食者的迁徙和摄食模式、监测气候变化的影响以及研究古档案方面具有潜在的应用价值。
We explored δ15N compound-specific amino acid isotope data (CSI-AA) in filter-feeding intertidal mussels (Mytilus californianus) as a new approach to construct integrated isoscapes of coastal primary production. We examined spatial δ15N gradients in the California Upwelling Ecosystem (CUE), determining bulk δ15N values of mussel tissue from 28 sites between Port Orford, Oregon and La Jolla, California, and applying CSI-AA at selected sites to decouple trophic effects from isotopic values at the base of the food web. Bulk δ15N values showed a strong linear trend with latitude, increasing from North to South (from ∼7‰ to ∼12‰, R2 = 0.759). In contrast, CSI-AA trophic position estimates showed no correlation with latitude. The δ15N trend is therefore most consistent with a baseline δ15N gradient, likely due to the mixing of two source waters: low δ15N nitrate from the southward flowing surface California Current, and the northward transport of the California Undercurrent (CUC), with15N-enriched nitrate. This interpretation is strongly supported by a similar linear gradient in δ15N values of phenylalanine (δ15NPhe), the best AA proxy for baseline δ15N values. We hypothesize δ15NPhe values in intertidal mussels can approximate annual integrated δ15N values of coastal phytoplankton primary production. We therefore used δ15NPhe values to generate the first compound-specific nitrogen isoscape for the coastal Northeast Pacific, which indicates a remarkably linear gradient in coastal primary production δ15N values. We propose that δ15NPhe isoscapes derived from filter feeders can directly characterize baseline δ15N values across major biochemical provinces, with potential applications for understanding migratory and feeding patterns of top predators, monitoring effects of climate change, and study of paleo- archives.
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影响因子：
64.8
作者：
Grantham, BA;Chan, F;Menge, BA
通讯作者：
Menge, BA
影响因子：
4.5
作者：
Hannides, Cecelia C. S.;Popp, Brian N.;Drazen, Jeffrey C.
通讯作者：
Drazen, Jeffrey C.
DOI：
10.1016/s0967-0637(98)00084-3
发表时间：
1999-04-01
影响因子：
2.4
作者：
Altabet, MA;Pilskaln, C;Francois, R
通讯作者：
Francois, R
影响因子：
4.5
作者：
CODISPOTI, LA;RICHARDS, FA
通讯作者：
RICHARDS, FA
影响因子：
3.7
作者：
Choy CA;Davison PC;Drazen JC;Flynn A;Gier EJ;Hoffman JC;McClain-Counts JP;Miller TW;Popp BN;Ross SW;Sutton TT
通讯作者：
Sutton TT