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Regulation of Nitrate Uptake by the Seagrass Zostera marina During Upwelling
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Regulation of Nitrate Uptake by the Seagrass Zostera marina During Upwelling
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Journal Article
Regulation of Nitrate Uptake by the Seagrass Zostera marina During Upwelling
2019
Overview
Prolonged nitrogen (N) fertilization can impact seagrass survival and productivity; however, the effects of N enrichment pulses (e.g., upwelling or sediment resuspension) remain poorly understood. This study examined the effects of short-term (1 h) pulsing of nitrate (
N
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3
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) enrichment, simulating an upwelling event, on dissolved inorganic carbon (DIC) and
N
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uptake capacities, critical in controlling eelgrass productivity. Zostera marina dominates submerged vegetation in coastal lagoons influenced by upwelling in the California Current system. Laboratory incubations were conducted in winter (non-upwelling) and spring (upwelling) with shoots collected from San Quintín Bay meadows, Baja California, Mexico, differentially exposed to upwelled
N
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. Results suggest that
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enrichment stimulated DIC and
N
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uptake in winter, reflecting the close relationship between carbon metabolism and
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assimilation. Eelgrass shoots showed reduced
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incorporation in spring; neither
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uptake nor photosynthesis increased when exposed to high
N
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. Saturation of spring shoots at lower ambient
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concentrations may be interpreted as a physiological strategy to restrict metabolically costly
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incorporation during upwelling; this regulation of
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uptake strongly contrasts to the apparently full exploitation of this nutrient by seaweeds also dominant within the bay, as indicated in previous works. Despite their reduced
N
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uptake, eelgrass meadows near the bay mouth acquire
N
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at rates up to 4.2 mmol N m⁻² day⁻¹. This represents nontrivial water column
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removal compared to the estimated oceanic
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supply (~ 7.1 mmol m⁻² day⁻¹) during upwelling, highlighting the importance of Z. marina beds in controlling the lagoonal N-budget.
