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Two major arguments in favor of using diatoms in water-quality assessments are that their distributions are cosmopolitan and their ecology is well studied.

支持以矽藻作為評斷水質的指標的主要的兩個論點是矽藻的分布很普遍分 以及對它們的生態已有相當仔細的研究。

If these assumptions are true, diatom-based monitoring tools could be considered universal and used in any geographic area.

如果這兩個論點是真的，以矽藻作指標的監測工具就會是很普遍化，而且能用在任何地理區域。

Indeed, some diatom metrics based on species indicator values developed in Europe are often used in North America and many other parts of the world.

確實，在歐洲所使用一些以矽藻物種的出現作為矽藻監測指標也常被應用在北美以及世界各地。

 There is considerable evidence, however, that diatom metrics are less useful when applied in a geographic area other than where species relations with environmental characteristics were originally studied to construct the metrics.

然而有相當多的證據顯示當矽藻指標被應用到其他非原先建立矽藻物種出現與環境變化之指標關係之研究的地理區域時，矽藻指標就顯得比較難以運用。

 We also demonstrate that metrics developed by studying diatom–nutrient relationships on the continental-scale can be further refined if combined with regional-scale studies.

我們也指出  當以大陸的範圍對矽藻與營養的關係所建立的矽藻指標, 如果此結果與區域性的研究合併, 矽藻指標能被進一步精簡化。

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