Table 2.

Mean and standard deviation of Imidacloprid concentrations (ng/g of spleen) for otter collected from minor watersheds in North Dakota, USA from 2017 to 2020. “LOD” is limit of detection. N refers to the number of otters collected in each watershed

Minor Watershed	Mean Imidacloprid Concentration (ng/g of spleen)	SD Imidacloprid Concentration	N
Elm River	< LOD	0.00	5
Devils Lake	0.91	1.42	6
Forest River	1.80	1.74	5
Goose River	0.98	1.48	9
James River	< LOD	.	1
Maple River	1.04	1.34	10
Park River	2.99	2.23	7
Pembina River	< LOD	0.00	6
Red River	< LOD	0.00	12
Sheyenne River	1.75	1.86	24
Souris River	< LOD	0.00	2
Turtle River	0.68	1.51	5
Wild Rice River	2.06	1.74	8