Table 3 Abundance categories for macroinvertebrates recorded in the field during WFD biomonitoring assessments.

From: A national macroinvertebrate dataset collected for the biomonitoring of Ireland’s river network, 2007–2018

Abundance category

Relative Percentage Frequency of Occurrence

Single

—

Few

1–5%

Common

6–20%

Numerous

21–50%

Dominant

51–74%

Excessive

>75%

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