The Company of Biologists

Table 4.

Grand mean vectors with respect to home and the gradient directions

Vector	All sites					Anomaly sites only
With respect to	N	α_N	r_N	N	α_N	r_N
Home	9	+8°	0.92^***	6	–10°	0.97^***
Increasing gradient	9	–46°	0.35^n.s.	6	–43°	0.50^n.s.
Decreasing gradient	9	–171°	0.32^n.s.	6	+64°	0.09^n.s.

Vector	All sites					Anomaly sites only
With respect to	N	α_N	r_N	N	α_N	r_N
Home	9	+8°	0.92^***	6	–10°	0.97^***
Increasing gradient	9	–46°	0.35^n.s.	6	–43°	0.50^n.s.
Decreasing gradient	9	–171°	0.32^n.s.	6	+64°	0.09^n.s.

α, mean vanishing bearing; r, length of mean vector; asterisks at r_N indicate significance by the Rayleigh test. Significance levels: ^***, P<0.001; n.s., not significant

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