Use of Breeding and Nonbreeding Encounters to Estimate Survival and Breeding-Site Fidelity of the Piping Plover at the Great Lakes

摘要

Abstract. In the Great Lakes region, numbers of the Piping Plover (Charadrius melodus) are gradually increasing, but the population of 100 pairs is still at risk of extinction and remains sensitive to fluctuations in adult survival. Given the central role of adult survival in population recovery, an accurate estimate of this quantity is essential. Using a Barker model and 11 years of mark-resighting data of breeding and nonbreeding Piping Plovers (1998–2008), we estimated true adult survival (S), probability of detection of breeding birds (p), probability of detection nonbreeding birds (R), and site fidelity (F). Adults' survival rate averaged 0.76 but with considerable annual process variation (σ = 0.05) and strong evidence of decline over this period. The probability of detection of breeding birds was near perfect (p = 1.00, 95% CI 0.97–1.00), but probabilities of detection of nonbreeders were substantially lower, although they increased from approximately 0.25 to 0.50 through the study period because ...