...
CD
0
Table 12.1. Calculation of production from insect fauna in 13 sets of samples from Afon Hirnant, Wales, 1955-1956."
2
3
4 b
5'
6 b
7
8
9
Biomass
Number
m
Size
Conversion
(standing
Production
Loss x
of times
Production
>c
CD
group
Average
Loss
at
factor to
stock)
conversion
conversion
loss
in volume
...
0
(mm)
numbers/m 2
each stage
volume
in vol. units
factor
factor
occurs
units
iii·
CD
(LJ+~J+ly
....
L
N
iij -ii}+l
U
Col. 2 x Col. 4
Col. 3 xCo. 6
Col. 7 x Col. 8
I\)
2,682.9
2,682.9
235.9
3.4
802.06
10
8,020.6
2
2,447.0
8
19,576.0
1,579.1
15.6
24,633.96
10
246,339.6
3
867.9
27
23,433.3
523.9
42.9
22,475.31
10
224,753.1
4
344.0
64
22,016.0
195.3
91.1
17,791.83
10
177,918.3
5
148.7
125
18,587.5
104.7
166.4
17,422.08
10
174,220.8
6
44.0
216
9,504.0
34.2
274.6
9,391.32
10
93,913.2
7
9.8
343
3,361.4
7.7
421.9
3,248.63
10
32,486.3
8
2.1
512
1,075.2
0.8
614.1
491.28
10
4,912.3
9
1.3
729
947.7
0.4
857.4
342.96
10
3,429.6
10
0.9
1,000
900.0
0.9
B,. =
102,084
1,157.6
1,041.84
10
10,418.4
P" =
976,413
"Modified from data of Hynes (1961) as treated by Hamilton (1969b).
bColumns 4 and 6 are estimates of mean individual volume.
'Column 5 is biomass (standing stock) in volumetric units, i.e.,
Col. 2
Col. 4
Col. 5
- - x
(N/m2)
(vol./individual) (vol./m2)