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首页> 外文期刊>Estuaries and coasts >Isotopic and Elemental Composition of Marine Macrophytes as Biotracers of Nutrient Recycling Within a Coastal Lagoon in Baja California, Mexico
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Isotopic and Elemental Composition of Marine Macrophytes as Biotracers of Nutrient Recycling Within a Coastal Lagoon in Baja California, Mexico

机译：墨西哥下加利福尼亚州沿海泻湖中作为养分循环生物示踪剂的海洋大型植物的同位素和元素组成

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摘要

Nutrient sources of San Quintin Bay, a coastal lagoon affected by coastal upwelling off Baja California (Mexico), were traced using generalized additive (mixed) models (GAMM) to the stable nitrogen isotopic composition, C:N and N content of two co-occurring macrophytes (the macroalgae Ulva spp. and the seagrass Zostera marina). The geochemical tracers followed a spatial trend that partly responded to the long-term nutrient gradient from the ocean towards the interior of the bay. N content in Z. marina and Ulva spp. decreased linearly (while C:N increased) towards the middle section of the bay to concentration levels that indicate potential N limitation for growth. Concurrently midway into the bay (6-9 km), the delta N-15 of both macrophytes showed a gradual enrichment in N-15 reflecting progressive denitrification. The spatial pattern of delta N-15 and the decrease in C:N of the macrophytes towards the innermost section of the bay indicated an additional nonoceanic source of dissolved nitrogen in this zone. The similarity of the delta N-15 pattern of Z. marina and Ulva spp. implies that their delta N-15 composition is mainly controlled by the availability of N, in spite of the physiological differences between taxa. A better fit of GAMM to N content and C:N was obtained for Z. marina than for Ulva spp. indicating that the former delineate more steadily and smoothly the influence of upwelling along the spatial gradient. Nonetheless, Ulva spp. may be analyzed in combination with Z. marina to characterize the environmental conditions at the time of sampling.
机译：使用广义加性（混合）模型（GAMM）追踪受下加利福尼亚州沿海上升流影响的沿海泻湖圣昆丁湾的营养源，以求得稳定的氮同位素组成，两种共存物的C：N和N含量发生的大型植物（大型藻类Ulva spp。和海草Zostera码头）。地球化学示踪剂遵循一种空间趋势，部分响应了从海洋到海湾内部的长期养分梯度。 Z. marina和Ulva spp中的N含量。朝向海湾的中部呈线性下降（而C：N增加）至浓度水平，表明潜在的N限制生长。在进入海湾的中途（6-9公里），两个大型植物的N-15三角洲N-15逐渐富集，反映了反硝化作用的进行。三角洲N-15的空间格局以及大型植物的C：N向海湾最内层的减少，表明该区域还有另外的非海洋性溶解氮源。 Z. marina和Ulva spp的N-15型三角洲相似性。这意味着尽管分类单元之间存在生理差异，但它们的N-15δ组成主要受N的可用性控制。与Ulva spp相比，Z。marina对GAMM的氮含量和C：N拟合更好。表明前者在空间梯度上勾画出上升流的影响更加平稳。尽管如此，Ulva spp。可以结合滨海假单胞菌进行分析，以表征采样时的环境条件。

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