Table 2. Amphibian data collection methods and efforts at the three study sites near Stockholm, Sweden.
| Site | 1. Skårby | 2. Kyrksjölöten | 3. Skeppdalsström | |||
|---|---|---|---|---|---|---|
| Before | After | Before | After | Before | After | |
| Visual search | ||||||
| Section searched (m) | 520 | ca 1,000 | ca 950 | |||
| No. of nights | 1 | 4 | 17a | 3b | 7 | 4 |
| Time period | April 15–16, 2004 | April 6–22, 2008 | March 27–May 9, 2012 | April 8–15, 2015 | April 7–19, 2015 | April 7–18, 2016 |
| Pitfall trapping along temporary fences | ||||||
| Section trapped (m) | – | 350 | – | – | ||
| No. of nights | – | 17a | – | – | ||
| Time period | – | March 27–May 9, 2012 | – | – | ||
| Net trapping | ||||||
| No. of tunnels | – | 4 | – | – | ||
| No. of nights | – | 5 | – | – | ||
| Time period | – | April 9–11, 2010, April 15–18, 2013 | – | – | ||
| Camera trapping | ||||||
| No. of tunnels | – | – | 2 | – | 4 | |
| No. of nights | – | – | 32c | – | 7–11d | |
| Time period | – | – | April 1–May 3, 2015 | – | April 5–23, 2016 | |
Notes:
a
Representing seven significant migration nights.
b
Representing a period of 8 days and nights.
c
Representing 14 significant migration nights.
d
Differed between tunnels; see Table 4.