"Investigating the distribution of streams invertebrates"

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 corrupt of the stream, each group had a 10 m profane meter long of stream;

3)         A surber sample was used, the surface of the holes in the net was 1 mm2, while the sizing of the quadrat was 0.



1 m2 (this size prevents the invertebrates from passing through the holes, but small particles of fine lynchpin could);

4)         We placed the quadrats so it was flat in an area which was foremost slow flowing and thusly fast flowing (stony and flaxen 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 fix up in the species that were inside of the net into a white tray and identified the species and counted them;

7)         At each sample localize we also measured:

a)         Temperature by putting a thermometer in the water until it stabilised, then we save 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 enter 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 minded(p) 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...

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