Table 1.

Cross dating statistics for Actinonaias ligamentina in the St. Croix River, MN

					Percent of individuals validated		Mean interseries R (Pearson’s)
Location	Processing method	Time series	Optimal spline flexibility	n	Before quality control	After quality control	Before quality control	After quality control
Interstate	External	1998-2009	34	33	42	42*	0.567	0.567**
	Internal	1975-1994	30	49	88	100	0.261	0.570
Wild river	External	1999-2009	24	35	43	43*	0.685	0.685**
	Internal	1974-1993	30	29	81	100	0.339	0.537

Note: n, the number of individuals validated for each population, that is all correlations are positive and significant; Optimal Spline Flexibility, the value resulting in the highest interseries correlation for each species; * Because mussels were returned to the river after processing, no specimens could be re-evaluated after using COFECHA; ** Only those individuals that initially were validated were used in the final data set for that population.