TABLE XVIII
Comparison of hmbers and Biomass of the Littoral Fauna with Calcium and Triclud Numbers. For method see text
a. Five lakes in N. Wales
Biomass (gm.)
Lake
Cangllitre
Triclads/hour
Timed
5 stones
O p e n
0 -4
0
0.02
0.02
Mymbyr
1.1
30
0.76
0.40
Teryn
0 -4
72
0-47
1-23
Hendref
18.7
160
8-69
3.38
Coron
!6*5
299
34-16
15-73
Number
Species
Timed
5 stones
Timed 5 stones
2
2
2
2
46
34
12
11
41
29
13
13
208
97
16
12
650
317
15
15
b. Lakes in Mid-Scotland (1963) arranged in ascending order of triclad numbers
C a w
Triclads
Bioaass (gm)
Dominant groups
Lake
lire
per h. Species
per h.
No.
Species
Biomass
Number
Arklett
Con
Ross
*Lochan X
Ard
ArdGan
Mentieth
Dougalston
Caldarvan
Bardowie
+Pond Y
Rmky
(8
16
12
20
58
:2
€0
2(8
E4
2 16
40
1f4
0
0
0
0
10
1
56
1
64
2
160
4
164
2
210
4
220
3
300
4
340
1
350
4
0.38
1.52
0 -54
3 -82
4-90
4.60
6 -05
6.45
3.04
6.60
7 -96
6.12
8
41
18
96
85
121
116
83
60
68
95
54
2
5
6
9
13
10
10
10
14
11
9
9
Ephemeroptera
Ephemeroptera
Ephemeroptera
Eph. + Plecoptera
Hirudinea
Asellus
Gastropoda
Hirudinea
Hirudinea
Hirudinea
Qammrua
Hirudinea
Ephemeroptera
Ephemeroptera
Ephemeroptera
Eph. + Plecoptera
Plecoptera
AseUus
Chironomus sp.
AseUwr
Asellus
Hirudinea
Clammarus
Hirudinea
* h h a n X 3 miles (4.8 lon) N. of Drymen.
Pond Y 1 mile (1.8 km) 9. of Strathbhne.