Importance of the national petroleum reserve-alaska for aquatic birds.
We used data from aerial surveys (1992-2010) of >100,000 km(2) and ground surveys (1998-2004) of >150 km(2) to estimate the density and abundance of birds on the North Slope of Alaska (U.S.A.). In the ground surveys, we used double sampling to estimate detection ratios. We used the aerial survey data to compare densities of birds and Arctic fox (Vulpes lagopus), the major nest predator of birds, on the North Slope, in Prudhoe Bay, and in nearby areas. We partitioned the Prudhoe Bay oil field into 2 × 2 km plots and determined the relation between density of aquatic birds and density of roads, buildings, and other infrastructure in these plots. Abundance and density (birds per square kilometer) of 3 groups of aquatic birds-waterfowl, loons, and grebes; shorebirds; and gulls, terns, and jaegers-were highest in the National Petroleum Reserve-Alaska (NPRA) and lowest in the Arctic National Wildlife Refuge. Six other major wetlands occur in the Arctic regions of Canada and Russia, but the largest population of aquatic birds was in the NPRA. Aquatic birds were concentrated in the northern part of the NPRA. For example, an area that covered 18% of the NPRA included 53% of its aquatic birds. The aerial surveys showed that bird density was not lower and fox density was not higher in Prudhoe Bay than in surrounding areas. Density of infrastructure did not significantly affect bird density for any group of species. Our results establish that the NPRA is one of the most important areas for aquatic birds in the Arctic. Our results and those of others also indicate that oil production, as practiced in Prudhoe Bay, does not necessarily lead to substantial declines in bird density or productivity in or near the developed areas. Prioridades para la Conservación de Aves en el Norte de Alaska.
Forest and Rangeland Ecosystem Science Center, U.S. Geological Survey, 970 Lusk Street, Boise, ID, 83706, U.S.A.. jon_bart@usgs.gov.
Jonathan
J
Bart
Robert M
RM
Platte
Brad
B
Andres
Stephen
S
Brown
James A
JA
Johnson
William
W
Larned
D000413:Alaska; D000818:Animals; D001717:Birds / Q000502:physiology*; D003247:Conservation of Natural Resources; D019652:Extraction and Processing Industry; D005843:Geography; D009425:Nesting Behavior; D010578:Petroleum; D011156:Population Density
D010578:Petroleum
Arctic National Wildlife Refuge; Bahía Prudhoe; National Petroleum Reserve-Alaska; North Slope; PRISM; Prudhoe Bay; Refugio Nacional de Vida Silvestre del Ártico; Reserva Nacional de Petróleo-Alaska