Title: Nest-site Selection in Cooperatively Breeding Pohnpei Micronesian Kingfishers (Halcyon cinnamomina reichenbachii): Does Nest-site Abundance Limit Reproductive Opportunities?

Despite their inherent importance and utility as ecological examples, island species are among the most endangered and least studied groups. Guam Micronesian Kingfishers (Halcyon cinnamomina cinnamomina) exemplify the plight of insular biota as a critically endangered and understudied island bird that went extinct in the wild before they could be studied in their native habitat. Guam kingfishers currently exist only as a captive population in U.S. zoos. Using radio telemetry and visual observations of a wild subspecies of Micronesian Kingfisher (H. c. reichenbachii) from the island of Pohnpei, this study examined factors critical for the persistence of both the Guam and Pohnpei kingfishers. Behavioral observations indicated that the birds employ a cooperative social system, which included non-parent individuals that assisted in reproductive attempts of others. Because resource limitations have been cited as a potentially important factor in the evolution of cooperative behaviors and in conservation, this Redacted for Privacy investigation assessed the characteristics and availability of a potentially limite