Table 2. Number of funnel traps needed per wetland to detect 2-10% positive and negative population trends over a 15 year period of annual sampling at 80% significance for Rana pipiens and Ambystoma tigrinum.

	Rana pipiens		Ambystoma tigrinum
% trend	Positive	Negative	Positive	Negative
10%	1	2	1	2
9%	1	2	1	2
8%	1	2	1	2
7%	1	2	1	2
6%	1	2	1	2
5%	1	3	1	3
4%	1	4	1	4
3%	2	6	3	6
2%	6	>10	6	10