Table 1 Descriptive statistics for 11 microsatellite loci for Physa acuta, 15 loci for Juturnia kosteri 19 loci for Pyrgulopsis roswellensis, and 15 loci for Gammarus desperatus at Bitter Lake National Wildlife Refuge.

Population	N	N_A	A_R	N_P	H_O	H_E
P. acuta
LSF	18.55	5.27	3.49	0.91	0.45	0.59
BC-DS	18.27	4.55	2.62	0.55	0.36	0.50
BC-LRC	19.09	4.36	3.48	0.18	0.41	0.51
SS	19.55	3.09	3.88	0.18	0.49	0.45
S-31	11.91	3.55	4.63	0.55	0.35	0.46
HM	9.91	3.36	3.29	0.18	0.40	0.50
RH	18.36	6.09	3.12	0.91	0.54	0.62
J. kosteri
LSF	20.53	3.47	2.72	0	0.42	0.41
BC-DS	22.60	4.20	3.00	0.27	0.28	0.40
BC-LRC	11.87	3.87	3.11	0	0.33	0.38
BC-F	23.33	5.13	3.44	0.53	0.37	0.44
SS	13.93	2.73	2.44	0.20	0.36	0.32
U3	31.67	4.07	2.77	0.20	0.37	0.37
U5A	26.93	4.27	2.94	0.33	0.41	0.43
U5B	21.00	3.47	2.76	0.13	0.39	0.41
U5C	22.93	3.73	2.90	0.13	0.36	0.42
U7	17.73	3.60	2.99	0.13	0.33	0.39
USU	26.33	3.93	2.82	0	0.39	0.42
HM	20.60	5.20	3.47	0.80	0.47	0.47
P. roswellensis
SS	18.84	5.32	5.04	0.16	0.50	0.52
SS-L	26.05	8.47	7.32	1.79	0.49	0.66
U5A	25.90	4.42	4.06	0.26	0.49	0.52
U6	23.95	6.53	5.80	0.74	0.66	0.60
U7	18.21	7.00	6.78	0.74	0.58	0.61
USU	19.26	3.96	6.64	0.53	0.58	0.63
G. desperatus
BC-LRC	19.60	4.87	4.50	0.13	0.68	0.56
SS	19.73	5.00	4.57	0.33	0.67	0.55
S-31	15.87	4.20	4.05	0.27	0.53	0.46
U6	23.87	4.67	3.65	0.13	0.56	0.47
U7	22.13	6.53	5.67	1.20	0.39	0.50
USU	23.60	4.40	3.82	0.13	0.34	0.41
RH	22.53	5.80	4.90	1.60	0.35	0.45

N mean sample size; N_A mean number of observed alleles, A_R mean number of rarefied alleles, N_P mean number of private alleles; H_O mean observed heterozygosity; H_E mean expected heterozygosity.

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