The Influence of Migration Timing and Local Conditions on Reproductive Timing in Arctic-Breeding Birds.

For birds breeding in the Arctic, nest success is affected by the timing of nest initiation, which is partially determined by local conditions such as snow cover. However, conditions during the non-breeding season can carry over to affect the timing of breeding. We used tracking and breeding data from 248 individuals of 8 species and subspecies of Arctic-breeding shorebirds to estimate how the timing of nest initiation is related to local conditions like snowmelt phenology versus prior conditions, measured by the timing and speed of migration.

Bear baiting risks and mitigations: An assessment using expert opinion analyses.

Bear baiting is authorized in 12 states, 2 territories, and 8 provinces across North America. In Alaska, more than 70% of lands managed by the National Park Service (NPS) are open to some form of hunting including National Preserves where non-conflicting state wildlife hunting regulations apply. Alaska state regulations authorize bear baiting with few restrictions on the type or amount of bait that can be used to attract bears; although, restrictions related to bait station distance from roads and trails (¼ mile) and cabins/dwellings (1 mile) apply.

Dopamine mediates a directionally opposite correlation between empathy and the reinforcing effects of amphetamine and gambling in people with gambling disorder vs. healthy controls.

Understanding the relationship between empathy, subjective effects of addictive reinforcers and dopamine function in people with gambling disorder (PGD) vs. healthy controls (HCs) may inform GD treatment. The current investigation addressed this issue via retrospective analysis of data from three studies using amphetamine and a slot machine (SLOTS) as reinforcers in PGD and HCs.

A circumpolar study unveils a positive non-linear effect of temperature on arctic arthropod availability that may reduce the risk of warming-induced trophic mismatch for breeding shorebirds.

Seasonally abundant arthropods are a crucial food source for many migratory birds that breed in the Arctic. In cold environments, the growth and emergence of arthropods are particularly tied to temperature. Thus, the phenology of arthropods is anticipated to undergo a rapid change in response to a warming climate, potentially leading to a trophic mismatch between migratory insectivorous birds and their prey.