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Climate and landscape modification facilitate range expansion in Spinus psaltria (Lesser Goldfinch) across the Pacific Northwest
Mason W Maron and others
Spinus psaltria (Lesser Goldfinch) has undergone significant range expansion throughout the Pacific Northwest in recent decades, expanding farther northward through Oregon, Idaho, and Washington. We used data from Project FeederWatch to reveal a 3.94 decimal degree or ~437.34 km northward expansion ...
Did complex song and dance co-evolve with brain size in the birds-of-paradise (Aves: Paradisaeidae)?
Thomas MacGillavry and others
Complex signaling behaviors, such as avian song and courtship displays, have been associated with increases in both absolute and relative brain size, presumably mediated by relationships between brain size and motor coordination and learning abilities. Nonetheless, reliably establishing these ...
Incubation period length varies with temperature, female age, and clutch size in Protonotaria citrea (Prothonotary Warbler)
J Koski Peterson and others
The length of the incubation period is determined by the development rate of embryos, which is dependent on thermal stability provided by environmental conditions and parental incubation behavior. With climate change, many bird species are advancing their breeding earlier in the season. This ...
Use of visual display in dark, cluttered environments
Kristina Fialko and Trevor D Price
Animals living in dense vegetation are limited in their use of visual signals due to the transmission constraints in these dim, cluttered environments. Birds in such habitats are often drab in appearance and thought to rely predominately on acoustic signals for conspecific communication. Here, we ...
Carry-over effects of winter conditions on nesting Somateria fischeri (Spectacled Eider), a sea ice-associated sea duck
Randall J Friendly and others
Climate change in the Arctic is occurring more rapidly than anywhere on the globe and changes in the marine environment can impact the distribution and abundance of Arctic and subarctic marine species. Understanding how a species responds to climate change can aid conservation planning and ...
Egg translocation across a local range boundary reduces hatch rates in a trailing-edge population of a migratory songbird, Setophaga caerulescens (Black-throated Blue Warbler)
Samuel A Merker and others
The abiotic range limitation hypothesis states that species distributions are shaped by physiological constraints imposed by temperature and precipitation. To test this hypothesis, we assessed the impacts of climate on hatch rates by reciprocally translocating complete clutches of both Setophaga ...
Postnatal dispersal and drivers of successful recruitment in resident Poecile gambeli (Mountain Chickadee)
Lauren E Whitenack and others
Many animals disperse from their natal sites as juveniles to settle in new locations where they may eventually breed. Estimating distances of such postnatal dispersal within and across populations, as well as identifying factors affecting recruitment success, is important for understanding ...
Courtship behavior of a secretive forest tinamou, Tinamus major (Great Tinamou)
Yinger Guo and others
The mating systems of many rainforest birds remain poorly understood, especially those that elude observation in dense forest understories. Here we documented mating behaviors in a pair of Tinamus major (Great Tinamou), a secretive species with a wide distribution across the lowland Central and ...
Barnacles dominate the winter diet of Calidris maritima (Purple Sandpiper) in Maine: A bona fide dietary shift or molecular techniques revealing an unknown diet composition?
Elliot M Johnston and others
At temperate latitudes, the overwintering period for birds is often longer than subsequent periods, and lower daily foraging success during this period may produce population-level impacts that are similar to or larger than those reported during shorter periods of the annual cycle. In this study, ...
Vital rates of intermittent nonbreeders and returning breeders strongly influence population dynamics of Somateria mollissima (Common Eider)
Alex Nicol-Harper and others
Risks and costs associated with reproduction may induce iteroparous species to employ intermittent breeding, whereby individuals forgo attempting reproduction in some breeding periods following recruitment to the breeding population. We explore this behavior through population-level analyses of ...
Bird on branch

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