Updated Geographic Distribution of Eight Passerine Species in Central Alaska

We documented the occurrence of eight rare passerines in central Alaska.Our observations of the Yellow-bellied Flycatcher, Red-breasted Nuthatch, Arctic Warbler, Golden-crowned Kinglet, Tennessee Warbler, Palm Warbler, Mourning Warbler, and Clay-colored Sparrow, provided new distributional information on the occurrence of these species in central Alaska.Mist netting was essential to documenting the geographic distribution of these species because mist-net captures represented the only occurrence of several species.Additionally, many of these records could not have been identified to subspecies without collecting individuals as voucher specimens that could be verified by other scientists.We used standardized mist-netting protocols to conduct intensive studies of the migration, population dynamics, and life histories of passerine birds in the Tanana River valley of central Alaska from 1992 to 1998.During these studies, we documented the occurrence of eight rare species.Here, we report captures and associated observations of these species that update our current understanding of the geographic distribution of these species in central Alaska.STUDY AREA The Tanana River valley is located in central Alaska and is bordered to the south by the Alaska Range and to the north by the Yukon-Tanana Uplands, an east/west highland of mature rounded hills (Figure 1).The Tanana valley is a well-documented migration corridor for many species of birds including Sandhill Cranes (Grus canadensis) (Kessel 1984), many species of waterfowl, shorebirds, passerines (Cooper and Ritchie 1995), and raptors (Cooper and Ritchie 1995, Mcintyre and Ambrose 1999).Fairbanks is located near the confluence of the Chena and Tanana rivers at 130 m elevation.Tok and Scottie Creek are located in the Upper Tanana Valley (Figure 1) at elevations of 500 and 550 m, respectively.The Fairbanks mist-netting station covered approximately 20 ha at Creamer's Field Migratory Waterfowl Refuge in Fairbanks (64 50' N, 147 50' W).A seasonally flooded wetland and a large agricultural field bordered the mist-netting station.The dominant tree species in the study site were Paper Birch (Betula papyrifera) White Spruce (Picea glauca), Balsam Poplar (Populus balsarnifera), Trembling Aspen (Populus trernuloides), and willow (Salix spp.).The Tok migration station was located 11 km west of Tok (63 22' N, 143 12'W) and 280 km SE of Fairbanks in a 65-ha patch of early

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