Egg hatchability in high Arctic breeding wader species Charadriiformes is not affected by determining incubation stage using the egg flotation technique

Figures & data

Table 1. Impact of the flotation method on the hatchability of eggs of four species of high arctic breeding waders. Data collected at the Zackenberg Research Station, Greenland, over three seasons, 2007–2009. P values refer to Fisher's exact test, with 1 degree of freedom. There are no significant differences between eggs which were floated and those which were not.

Species	Floating	Hatching		P
		No	Yes
Dunlin	No	2	45	0.496
	Yes	0	42
Red Knot	No	0	6	1.000
	Yes	0	6
Sanderling	No	10	60	0.245
	Yes	12	41
Ruddy Turnstone	No	0	22	1.000
	Yes	0	20

Table 2. The developmental stages of embryos in unhatched floated and unhatched non-floated eggs from two species of high arctic breeding waders. Data collected at the Zackenberg Research Station, Greenland, over three seasons, 2007–2009.

Species	Egg floated	Embryo development
		No visible embryo	Small embryo	Large embryo	No data
Dunlin	No	1			1
	Yes
Sanderling	No	9		1
	Yes	12