Stable nitrogen isotope ratios (d¹⁵N values) can be used to discern sources of excess nitrogen pollution in water. The d¹⁵N values of nitrate in water often do not reflect the true d¹⁵N source owing to high temporal variation, and analytical costs associated with obtaining δ¹⁵N values from water nitrate are high. To find alternative solutions we isotopically‐labelled macroalgae (i.e., seaweed) beyond natural variation as a new method for determining sources of excess nitrogen pollution in seawater.

中文翻译：

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同位素标记的大型藻类：一种确定过量氮污染源的新方法。

稳定的氮同位素比（d ¹⁵ N值）可用于识别水中过量氮污染的来源。所述d ^15个在水中的硝酸的N个值通常不反映真实d ¹⁵ N个源由于高的时间变化，以及与获得δ相关的分析成本^15个从硝酸盐水N个值是高的。为了找到替代解决方案，我们用同位素标记的大型藻类（即海藻）超越了自然变化，作为确定海水中过量氮污染源的新方法。