Assessing the importance of burrows through behavioral observations of Parastacus brasiliensis, a Neotropical burrowing crayfish (Crustacea), in laboratory conditions

Zoological Studies

Table 1 Results of Rayleigh's Z test for circadian activity of Parastacus brasiliensis under laboratory conditions

Crayfish	Carapace length (mm)	Mean vector (μ)	Length of mean vector (r)	Z value	p value
Indiv 1	18.37	19:55	0.390	633.977	<0.0001^a
Indiv 2	23.55	19:39	0.381	173.409	<0.0001^a
Indiv 3	24.02	22:56	0.227	296.091	<0.0001^a
Indiv 4	20.99	22:10	0.441	240.094	<0.0001^a
Indiv 5	21.94	18:51	0.171	9.994	<0.0001^a
Indiv 6	26.84	21:02	0.461	527.031	<0.0001^a
Indiv 7	25.7	20:18	0.172	186.459	<0.0001^a