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3.4.2. The total earthworm population density in Jurmala sampling plots<br />
In all sample plots uncharectically high earthworm density was observed<br />
(Table 3.2). Most of the earthworms were found in greatly eutrophicated plots<br />
(Figure 3.1), but density was high also in the control plots. As in both control<br />
sampling plots phytocenotic changes were not observed, it should be considered that<br />
the earthworm populations on soil changes respond faster than the vegetation.<br />
Table 3.2<br />
Mean density (ind. m -2 ) and relative numbers (%) of earthworm species in Jūrmala<br />
sample plots during observation period<br />
Parauglaukums Suga<br />
Dendrobaena<br />
1989.g.rud. 1990.g.pav. 1990.g.rud. % total<br />
octaedra<br />
12,4<br />
1,6<br />
25,6<br />
60<br />
Pumpuri Lumbricus<br />
rubellus<br />
22,8<br />
-<br />
3,2<br />
40<br />
Kopā<br />
Dendrobaena<br />
35,2 1,6 28,8 100<br />
octaedra<br />
17,6<br />
8,8<br />
20,0<br />
59<br />
Jaundubulti Lumbricus<br />
rubellus<br />
22,4<br />
-<br />
9,2<br />
41<br />
Kopā<br />
Dendrobaena<br />
40 8,8 29,2 100<br />
octaedra<br />
Lumbricus<br />
19,2<br />
5,6<br />
16<br />
50<br />
Vaivari rubellus<br />
Aporrectodea<br />
9,2<br />
9,6<br />
21,6<br />
49<br />
calliginosa<br />
-<br />
-<br />
0,8<br />
1<br />
Kopā<br />
Dendrobaena<br />
28,4 15,2 38,4 100<br />
octaedra<br />
Lumbricus<br />
20,8<br />
11,6<br />
25,2<br />
46<br />
Bulduri 1 rubellus<br />
Lumbricus<br />
23,2<br />
12<br />
20,4<br />
45<br />
castaneus<br />
-<br />
4,8<br />
6<br />
9<br />
Kopā<br />
Dendrobaena<br />
44 28,4 51,6 100<br />
octaedra<br />
Lumbricus<br />
26,8<br />
21,6<br />
10<br />
35<br />
rubellus<br />
25,2<br />
29,2<br />
34,8<br />
53<br />
Bulduri 2<br />
Lumbricus<br />
castaneus<br />
Aporrectodea<br />
-<br />
1,6<br />
-<br />
< 1<br />
calliginosa<br />
9,2<br />
2<br />
7,6<br />
11<br />
D.rub.ten.<br />
-<br />
-<br />
0,8<br />
< 1<br />
Kopā 61,2 54,4 53,2 100<br />
Dendrobaena<br />
octaedra<br />
2,8<br />
5,6<br />
8,4<br />
9<br />
Lumbricus<br />
rubellus<br />
48<br />
25,2<br />
36<br />
61<br />
Dzintari<br />
Lumbricus<br />
castaneus<br />
Aporrectodea<br />
calliginosa<br />
D.rub.ten.<br />
7,2<br />
16,8<br />
0,8<br />
7,2<br />
-<br />
-<br />
17,6<br />
3,2<br />
-<br />
18<br />
11<br />
< 1<br />
Octolasion<br />
lacteum<br />
-<br />
0,8<br />
-<br />
< 1<br />
Kopā 75,6 38,8 65,2 100<br />
25
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