Table 4.

Models explaining variations in contaminant levels in Gull eggs collected in 2012 and 2013 from the New York/New Jersey harbor estuary

Herring Gull	Arsenic	Cadmium	Chromium	Lead	Mercury	Selenium
Model
F	7.0	11.5	19.6	4.6	14.1	8.9
df	9	9	9	9	9	9
P	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001
r2	0.42	0.54	0.67	0.32	0.59	0.47
Factors entering
F (p)
Location	2.9 (0.03)	2.9 (0.03)	11.2 (<0.0001)	2.9 (0.03)	5.7 (0.0004)	4.6 (0.002)
Year	NS	83.7 (<0.0001)	117 (<0.0001)	22.7 (<0.0001)	73.6 (<0.0001)	47.7 (<0.0001)
Location × (year)	12.0 (<0.0001)	NS	3.3 (0.01)	NS	7.9 (<0.0001)	3.4 (0.01)
Great Black backed gull	Arsenic	Cadmium	Chromium	Lead	Mercury	Selenium
Model
F	0.3	0.6	0.3	5.9	6.6	2.5
df	2	2	2	2	2	2
P	NS	NS	NS	0.009	0.01	NS
r2	0.02	0.05	0.03	0.35	0.34	0.18
Factors entering
F (p)
Location	NS	NS	NS	NS	NS	NS
Year	NS	NS	NS	11.7 (0.003)	11.2 (0.003)	5.0 (0.04)
Location × (year)	NS	NS	NS	NS	NS	NS

Metals data was log transformed for normality

NS not significant