Table 2. Sampling intensities needed to detect
overall changes of 50%, 25%, and 10% over
10 years of annual monitoring of amphibian
populations. Values are the number plots or
subpopulations that should be monitored to detect
a trend at alpha = 0.1 with a likelihood (power)
of > 0.90 given 5, 4, 3, 2, or 1 annual count(s)
of each plot or subpopulation. All estimates
were made with the "monitor.exe" program
with 250 replications.
Counts/year
54321
Terrestrial and Streamside Salamanders
0.51010101010
0.251010101020
0.120304070100
Pond-breeding Salamanders
0.51010102030
0.252030305080
0.1110120170>250>250
Frogs and Toads
0.51010101020
0.252020203060
0.17090100160>250