Table 3.
Genetic diversity and number of snails genotyped for each collection event and site. Parenthetical numbers below number of snails genotyped indicate snail density per cubic meter at each collection site. Superscript O indicates habitat classified as “open”, while X indicates habitat classified as “closed”. Values in bold are significantly different from zero (α = 0.05).
| Collection Site | Season | # Snails | NA | HS | f | |
|---|---|---|---|---|---|---|
| Caju | Stream 1 O | Wet | 51 (303.3) |
3.57 | 0.38 | 0.16 |
| Dry | 14 (23.21) |
2.43 | 0.39 | 0.06 | ||
| Spring 1 X | Wet | 6 (4.9) |
1.43 | 0.16 | 0.36 | |
| Dry | 64 (414.7) |
1.86 | 0.17 | −0.17 | ||
| Spring 2 X | Wet | 24 (15.7) |
2.00 | 0.22 | 0.33 | |
| Dry | 12 (10.9) |
1.57 | 0.22 | −0.09 | ||
| Monteiro Stream 1 O | Wet | 3 (113.3) |
1.57 | 0.26 | −0.09 | |
| Dry | 61 (168.3) |
3.86 | 0.39 | 0.09 | ||
| SPdJ | Stream 1 Upstream O | Wet | 11 (18.7) |
5.86 | 0.70 | 0.06 |
| Dry | 18 (74.8) |
7.29 | 0.76 | 0.18 | ||
| Stream 1 Downstream O | Wet | 31 (356.7) |
6.57 | 0.72 | 0.20 | |
| Dry | 22 (10) |
6.86 | 0.73 | 0.20 | ||
| Stream 1 Rock Pool X | Wet | 17 (58) |
2.71 | 0.41 | 0.40 | |
| Dry | 46 (170.7) |
2.00 | 0.23 | 0.06 | ||
| VdG | Marsh-Stream 2 O | Wet | 7 (0.6) |
3.12 | 0.43 | −0.05 |
| Dry | 15 (190.4) |
3.43 | 0.56 | 0.02 | ||
| Stream 3 O | Wet | 6 (3.9) |
2.57 | 0.48 | 0.11 | |
| Dry | 11 (3.6) |
2.43 | 0.14 | 0.10 | ||
| Spring 1 X | Wet | 69 (28.5) |
3.29 | 0.48 | 0.01 | |
| Dry | 28 (17.1) |
3.43 | 0.57 | 0.01 | ||
| Suçuarana Stream 1 O | Wet | 5 (0.4) |
2.29 | 0.40 | 0.15 | |
| Dry | 11 (1.5) |
2.57 | 0.41 | 0.22 | ||
| Suçuarana Spring 2 X | Wet | 52 (34.4) |
1.29 | 0.01 | 0 | |
| Dry | 14 (3.5) |
1.14 | 0.01 | 0 | ||
NA, number of alleles
HS, Nei’s (1987) unbiased heterozygosity
f, Weir and Cockerham’s (1984) estimate of inbreeding