Polyphosphate phosphorus in the Great Lakes

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Xingyu Yang, Rixuan Gao, Audrey Huff, Sergei Katsev, Ted Ozersky, Jiying Li
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Abstract

Polyphosphate (polyP) is important to phytoplankton ecology, but a unified view of its variability and roles in ecosystem-scale phosphorus (P) cycling is lacking. We study polyP in the world's largest freshwater ecosystem, the Laurentian Great Lakes, covering pelagic to nearshore areas across a wide nutrient gradient. We show that polyP (average 10.99 ± 3.90 nmol L−1) constitutes 3.8–30.2% (average 18.1 ± 7.2%) of total particulate P (TPP). PolyP accumulation is higher in low-P pelagic waters compared with more productive nearshore areas. PolyP is preferentially degraded in the water column of the Great Lakes, enhancing P recycling and relieving the nitrogen (N) : P imbalance. Our data enables a coherent large-scale freshwater-to-oceanic comparison. We show that while different plankton groups accumulate different levels of polyP with smaller plankton accumulating more, P availability is the key driver of polyP variability within and across systems.

Abstract Image

五大湖中的多磷酸盐磷
多磷酸盐(polyP)对浮游植物生态学非常重要,但对其在生态系统尺度磷(P)循环中的变化和作用却缺乏统一的认识。我们对世界上最大的淡水生态系统--劳伦伦五大湖--的多磷酸盐进行了研究,研究覆盖了从浮游到近岸的广泛营养梯度区域。我们发现,多聚磷(平均 10.99 ± 3.90 nmol L-1)占总颗粒态磷(TPP)的 3.8-30.2%(平均 18.1 ± 7.2%)。与产量较高的近岸区域相比,低磷浮游水域的多聚磷累积量更高。PolyP 在五大湖的水体中优先降解,从而加强了 P 的循环,缓解了氮(N).P 的不平衡:P 失衡。我们的数据实现了从淡水到海洋的大规模连贯比较。我们的研究表明,虽然不同浮游生物群积累的多聚磷水平不同,小型浮游生物积累的多聚磷更多,但多聚磷的可用性是系统内和系统间多聚磷变化的主要驱动因素。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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