Method
1)We investigate the distribution of Benthic invertebrates at the Nant Iago stream, which is near Abergaveng in South Wales;
2)We measured a 150 m stretch of the stream, each group had a 10 m stretch meter long of stream;
3)A surber sample was used, the size of the holes in the net was 1 mm2, while the size of the quadrat was 0.1 m2 (this size prevents the invertebrates from passing through the holes, but small particles of fine sand could).
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