highly significantp < 0.0001
Highly significant differences were found between substrates in February (F = 5.217; df = 5, 114; p < 0.0001), April (F = 5.983; df = 5, 114; p < 0.0001), and August (F = 7.672; df = 5, 114; p < 0.0001); significant differences in June (F = 4.066; df = 5, 114; p < 0.01), December (F = 4.194; df = 5, 114; p < 0.01), and October (F = 2.948; df = 5, 114; p < 0.05).