Open Access
Table 4
Frequency of habitats occupied by Galba truncatula in the department of Haute Vienne between 1970 and 2006 in relation to different categories for the mean altitude, mean annual rainfall and mean annual temperature of municipalities.
| Parameter and categories | Number of habitats with Galba truncatula | Number of water points surveyed | Frequency (%) of snail habitats [95% confidence intervals] |
|---|---|---|---|
| Mean altitude | |||
| <300 m | 3721 | 5212 | 71.39 [70.10; 72.62] |
| [300;400 m[ | 2980 | 5415 | 55.03 [53.60; 56.36] |
| [400;500 m[ | 598 | 2067 | 28.93 [26.90; 30.94] |
| ≥500 m | 108 | 784 | 13.78 [11.40; 16.39] |
| Total | 7407 | 13 478 | 54.96 [54.10; 55.80] |
| Mean annual rainfall | |||
| <900 mm | 511 | 755 | 67.68 [64.20; 71.01] |
| [900;1000 mm[ | 3166 | 4815 | 65.75 [64.30; 67.09] |
| [1000;1100 mm[ | 2371 | 4395 | 53.95 [52.40; 55.43] |
| [1100;1200 mm[ | 1172 | 2884 | 40.64 [38.80; 42.46] |
| ≥1200 mm | 187 | 629 | 29.73 [26.10; 33.47] |
| Total | 7407 | 13 478 | 54.96 [54.10; 55.80] |
| Mean annual temperature | |||
| <9.5 °C | 7 | 54 | 12.96 [5.37; 24.90] |
| [9.5 °C;10 °C[ | 60 | 361 | 16.62 [12.90; 20.87] |
| [10 °C;10.5 °C[ | 563 | 1734 | 32.47 [30.20; 34.73] |
| [10.5 °C;11 °C[ | 2861 | 5479 | 52.22 [50.80; 53.55] |
| ≥11 °C | 3916 | 5850 | 66.94 [65.70; 68.15] |
| Total | 7407 | 13 478 | 54.96 [54.10; 55.80] |
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