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);
4) We placed the quadrats so it was flat in an area which was firstly slow flowing and then fast flowing (stony and sandy regions);
5) We the disturbed the area by turning the rocks and brushed then lightly into the net so that the species were washed in by the current;
6) Then we put the species that were inside of the net into a white tray and identified the species and counted them;
7) At each sample site we also measured:
a) Temperature by putting a thermometer in the water until it stabilised, then we recorded it;
b) Dissolved Oxygen by using a probe which we stirred, for about 30 seconds, in the water encouraging the water to move, then we recorded it;
c) pH by using a pH meter which was put in the water, then we recorded it;
d) Depth of water by using a metal measuring tape, then we recorded it;
e) Velocity by using a probe that we put in the water, then we recorded it;
f) Sediment size by estimating the size and by comparing it with a card given to us with many possible sizes, then we recorded it;
g) T.D.S.
by using a probe which we put into the water, then we recorded it;
h) The...
Wow
I'm not into chemistry or biology, so this one kind of lost me. It looks well set out, but someone who knows something about biology would be better equipped to comment on the content.
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