The Feasibility of Nightlighting for Monitoring Brood Production of Wood Ducks on Rivers
To determine the applicability of the nightlighting technique for monitoring wood duck (Aix- sponsa) brood production on rivers in Tennessee, we compared results of day and night surveys on 8 rivers in spring 1990. Results of 32 day counts and 16 night counts showed that 112% more broods/km were seen at night (X = 0.55, SE = 0.022) than day (X = 0.26, SE = 0.20). The mean number of broods/km did not differ (P < 0.05) between replications for either night counts or day counts. There was a significant (P = 0.01) but weak (R = 0.61) relationship between the first day counts and night...
