Fig 1.
Locations of four geographically distinct breeding populations of Red-throated Loons in Alaska.
Satellite transmitters were deployed on Red-throated Loons at these locations between 2000 and 2010. The Copper River Delta is in an open boreal forest whereas the other study sites were in treeless tundra.
Table 1.
The number of satellite transmitters (PTTs) deployed for each Red-throated Loon breeding population by year.
Fig 2.
Migration patterns, stopover sites and wintering areas for Red-throated Loons breeding on the Arctic Coastal Plain (ACP) in northern Alaska.
A) East Asian migration of Red-throated Loons. B) Pacific migration of a single Red-throated Loon from the Arctic Coastal Plain breeding area. Red dots represent breeding area locations, yellow dots are fall stopover sites, blue dots are wintering area locations, and green dots are spring stopover sites.
Fig 3.
Migration patterns, stopover sites, and wintering areas of Red-throated Loons from 3 breeding populations.
Red-throated Loon breeding areas in Alaska include the A) Seward Peninsula (SP), B) Yukon-Kuskokwim Delta (YKD), or C) Copper River Delta (CRD). Red dots represent breeding area locations, yellow dots are fall stopover sites, blue dots are wintering area locations, and green dots are spring stopover sites.
Fig 4.
Average latitude of Red-throated Loons at important stages of the annual cycle from 4 different breeding populations.
Red-throated Loon breeding populations represent Alaska’s Arctic Coastal Plain (ACP), Seward Peninsula (SP), Yukon-Kuskokwim Delta (YKD), and Copper River Delta (CRD).
Fig 5.
Average distance (km, ± SD) of migrations to fall stopover sites and wintering areas by Red-throated Loons.
Red-throated Loon breeding populations represent Alaska’s Arctic Coastal Plain (ACP), Seward Peninsula (SP), Yukon-Kuskokwim Delta (YKD), and Copper River Delta (CRD).
Fig 6.
Average temporal migration patterns by Red-throated Loon breeding population.
Line length represents date ranges from earliest arrival to latest departure. Average date of arrival denoted by diamond (◊), and average date of departure denoted by asterisk (*). Multiple lines represent different spatially distinct stopover or wintering areas used by loons from a breeding population. Breeding areas represent Alaska’s Arctic Coastal Plain (ACP), Seward Peninsula (SP), Yukon-Kuskokwim Delta (YKD), and Copper River Delta (CRD).