. Author manuscript; available in PMC: 2015 Jan 20.

Published in final edited form as: Environ Monit Assess. 2008 Jul 15;152(0):179–194. doi: 10.1007/s10661-008-0306-6

Table 4.

Metal and metalloid concentrations (ng/g= ppb on dry weight) in adult glaucous-winged gull feathers by gender

Feathers	Male	Female	X²(p)
Adults	n=33	n=24
Body weight (g)	1,530±63.6	1350±38.6	2.7 (NS)
Arsenic	139±38.4	127±23.2	1.8 (NS)
Arsenic	7.5	43.0	1.8 (NS)
Cadmium	66.8±8.2	60.0±11.1	0.3 (NS)
Cadmium	49.3	42.8	0.3 (NS)
Chromium	1,200±334	274±66.9	15.1 (0.0001)
Chromium	592	188	15.1 (0.0001)
Lead	793±104	733±183	1.5 (NS)
Lead	571	277	1.5 (NS)
Manganese	1,440±190	840±274	13.5 (0.0002)
Manganese	1,140	365	13.5 (0.0002)
Mercury	3,670±573	3,800±469	0.4 (NS)
Mercury	2,350	2,760	0.4 (NS)
Selenium	939±76.8	1,010±75.2	0.2 (NS)
Selenium	744	935	0.2 (NS)

First row gives arithmetic mean±SE. Second row gives geometric mean. Right hand column compares differences using Kruskal–Wallis non-parametric one-way analysis of variance yielding chi square values and p values