Long-term Outcomes of a Laysan Albatross <i>Phoebastria immutabilis</i> Foster Egg Translocation Program

In the 1960s and 1970s, Laysan Albatrosses Phoebastria immutabilis colonized several sites in the Pacific from which they had been extirpated or had not been known to nest previously, including the US Navy’s Pacific Missile Range Facility (PMRF) on Kaua‘i, Hawai‘i, USA, where they increased to become a bird aircraft strike hazard (BASH). To reduce their population at PMRF, albatross eggs were destroyed or removed as part of a BASH reduction program until 2005, when an alternate plan was devised by the Navy, US Fish and Wildlife Service, and US Department of Agriculture Wildlife Services, in which eggs from PMRF were placed in foster nests at other colonies on Kaua‘i where the natural egg was infertile or had died. During 2009–2022, we placed 500 eggs from PMRF in foster nests on Kaua‘i and the Hawaiian island of O‘ahu. The egg viability rate in all colonies was 73% and varied among years. The hatching rate of foster eggs was 53%, fledging rate was 72%, and overall reproductive success was 38%, rates that were slightly lower than in natural eggs at the same sites. This project resulted in 189 fledged Laysan Albatross that otherwise would have died, and it helped solve a human-wildlife conflict. Several useful management techniques and egg translocation methods were developed during this project that can be used in similar projects with other seabirds.