Odonata - Entomological Society of Latvia - Latvijas Daba

Figure 16. A distribution of Leucorrhinia pectoralis in Latvia in the 5x5 km square grid.
The data on L. albifrons habitats were obtained from 130 water bodies, on L. caudalis from
97 water bodies and on L. pectoralis from 160 water bodies. L. albifrons was mostly found in
dystrophic lakes, L. caudalis in eutrophic lakes, but L. pectoralis in oxbow lakes (Table 10). From
55 surveyed oxbows of the Gauja river L. albifrons was found in 2 oxbows, L. caudalis – in 14
oxbows and L. pectoralis – in 36 oxbows.
Table 10. The Leucorrhinia albifrons, L. caudalis and L. pectoralis selected habitats in Latvia.
Species
Mesotrophic
lake
Leucorrhinia albifrons 13
(10 %)
Leucorrhinia caudalis 6
(6 %)
Leucorrhinia pectoralis 7
(4 %)
Eutrophic
lake
41
(32 %)
49
(51 %)
41
(26 %)
Dystrophic
lake
62
(48 %)
16
(16 %)
40
(25 %)
Pond Oxbow Other
4
(3 %)
5
(5 %)
9
(6 %)
2
(2 %)
17
(18 %)
51
(32 %)
8
(6 %)
4
(4 %)
12
(8 %)
During the study of 2005 in Tītmaņi oxbow, L. albifrons was found in two surveys in one
sampling plot (three individuals), while L. caudalis was found in one survey in one sampling plot
(one individual). L. pectoralis was found in six surveys in eight sampling plots (total 70
individuals). The greatest number of individuals was found in sampling plots with open water pools
and little shading (up to 30 %; No. 1, 2, 3, 4, 7). The dominating plants in these sampling plots were
Menyanthes trifoliata, Stratiotes aloides, Glyceria fluitans, Carex nigra and Equisetum fluviatile,
except for one sampling plot (No. 4), where Agrostis tenuis predominated. In two sampling plots
(No. 5, 8), L. pectoralis was not found.
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