We seeded experimental plots with number 4 lead pellets and sampled these plots for 10 years to assess the settlement rate of pellets in tundra wetland types commonly used by foraging waterfowl. After 10 years, about 10% of pellets remained within 6 cm of the surface, but >50% remained within 10 cm. We predict that spent lead pellets will eventually become unavailable to waterfowl; however, it will likely require >25 years for all pellets to exceed depths at which waterfowl species may forage.It'd suggest we're not being conservative enough in controlling lead shot in other areas. Despite recent efforts to step up lead shot control in the YK, it's still 25 years out before it ceases to be a human and wildlife hazard.
Wednesday, 20 January 2010
Abstracts: Long-Term Persistence of Spent Lead Shot in Tundra Wetlands
From JWM, Flint PL, Schamber JL (2010) Long-Term Persistence of Spent Lead Shot in Tundra Wetlands. Journal of Wildlife Management: Vol. 74, No. 1 pp. 148–151 DOI: 10.2193/2008-494.