Gregory S. Kaltenecker

• Boise State University

Pinyon-juniper woodlands are dry ecosystems defined by the presence of juniper (Juniperus spp.) and pinyon pine (Pinus spp.), which stretch over 400 000 km 2 across 10 US states. Certain areas have become unnaturally dense and have moved into former shrub and grasslands, while others have experienced widespread mortality. To properly manage these w...

Seasonal migration is a dynamic natural phenomenon that allows organisms to exploit favourable habitats across the annual cycle. While the morphological, physiological and behavioural changes associated with migratory behaviour are well characterized, the genetic basis of migration and its link to endogenous biological time-keeping pathways are poo...

This is work I presented at the 3rd International Congress on Bird Migration and Global Change, the results of which we described in Ardea.

Many American kestrel (Falco sparverius) populations are declining across North America. Potential causes include mortality from reduction in food availability, a changing climate, habitat degradation, an increase in avian predators, disease, and toxins. We analyzed American kestrel count and banding data from seven raptor migration sites throughou...

Sagebrush (Artemisia spp.) steppe is one of north America's most imperiled ecosystems, as the result of many factors including grazing, development, fire, and invasion of exotic plants. threats to sagebrush steppe are expected to increase because of climate change and further human development. Many songbirds use sagebrush steppe opportunistically,...

Sagebrush (Artemisia spp.) steppe is one of North America's most imperiled ecosystems, as the result of many factors including grazing, development, fire, and invasion of exotic plants. Threats to sagebrush steppe are expected to increase because of climate change and further human development. Many songbirds use sagebrush steppe opportunistically,...

Annual counts of migrating raptors at fixed observation points are a widespread practice, and changes in numbers counted over time, adjusted for survey effort, are commonly used as indices of trends in population size. Unmodeled year-to-year variation in detectability may introduce bias, reduce precision of trend estimates, and reduce power to dete...

While alteration of the migratory habits of birds is widely regarded as one of the most evident ecological effects of climate change, studies reporting shifts in migration phenology for long-lived, long-distance migrants have been few. Using time series of count data collected in southern Spain during autumn migration, we examined the magnitude and...

Migration is a significant event in the annual cycle of many avian species. During migration birds face many challenges, including unfamiliar foraging and refuge habitats, resulting in a much higher rate of mortality during migration than during other seasons of the year. Weather may significantly affect a bird’s decision to initiate migration, the...

While alteration of the migratory habit of birds is widely regarded as one of the most evident ecological effects of climate change, studies reporting shifts in migration phenology for long-lived, long-distance migrants have been few. We set forth to analyze the effects of local and regional weather conditions on the migration counts and evaluate t...

Incremento de La Frecuencia de Captura de Psiloscops flammeolus y Aegolius acadicus Durante La Migración Otoñal Hemos estado anillando individuos de Psiloscops flammeolus y Aegolius acadicus durante la migración otoñal en Idaho desde 1998. Nuestras redes de niebla con señuelos auditivos se ubican dentro de bosques de Pseudotsuga menziesii con muy e...

Climate change is having a dramatic effect on many migratory species. Changes in climate may lead to changes in food availability or other proximate cues that affect migratory behavior. We used 13 years (2000–2012) of data on songbird banding and raptor migration counts and captures during autumn migration in the intermountain West to evaluate whet...

Many authors have suggested that the negative effects of roads on animals are largely owing to traffic noise. Although suggestive, most past studies of the effects of road noise on wildlife were conducted in the presence of the other confounding effects of roads, such as visual disturbance, collisions and chemical pollution among others. We present...

Knowledge of the migration geography of Flammulated Owls (Otus flammeolus) is limited. We combined data from multiple studies in the western United States to evaluate patterns of variation in Flammulated Owl morphometrics. Measurements from autumn migration study sites in New Mexico, Nevada, and Idaho followed a geographic cline from southeast to n...

Weather has a significant effect on avian migration, but whether the influence is similar across diverse geographic regions and across all species remains to be determined. We evaluated the effect of regional cold fronts and localized weather phenomena on the timing of autumn migration of multiple species of landbirds and raptors in southwest Idaho...

Las asociaciones entre niveles de corticoesterona, reservas de energía y estrés son muy importantes para la fisiología de la migración de las aves. Muchas aves mantienen elevados niveles de base de corticoesterona durante la migración. Sin embargo, ellas frecuentemente modulan secreciones adicionales de glucocorticoides, probablemente para proteger...

Because mercury contamination is potentially threatening to bald eagle (Haliaeetus leucocephalus) populations, we collected molted feathers at nests to determine the level of contamination in bald eagles in the state of Idaho, USA. Eagle feathers contained measurable amounts of cadmium (Cd), chromium (Cr), selenium (Se), lead (Pb), as well as mercu...

Comparamos la ecología migratoria de dos especies de búhos (Otus flammeolus y Aegolius acadicus) que presentan diferentes estrategias de migración. Capturamos 117 individuos de O. flammeolus y 1433 de A. acadicus en el sur de las montañas Boise, suroeste de Idaho, durante las temporadas de otoño de 1999 a 2004. Estas especies de búhos presentaron d...

Los patrones intraespecíficos del momento en que tiene lugar la migración de otoño no son bien conocidos, particularmente en el oeste de los Estados Unidos. En este estudio (1) describimos el momento en que sucede la migración de otoño y los cocientes de edades de migrantes terrestres en el suroeste de Idaho, (2) examinamos las diferencias en el mo...

We used count surveys and mist-net captures to compare habitat associations, relative abundance, species richness, and community similarity of migrant landbirds among four major habitats in the Boise Foothills of southwestern Idaho. Count surveys were conducted from August through October 1997-2000 in conifer forest, mountain shrubland, shrubsteppe...

Report summarizes 2 years of data from spring and fall songbird migration banding at a national wildlife refuge (NWR) and point count surveys at the NWR and 2 nearby wildlife management areas (WMAs).

We analyzed counts from 10 watchsites in western North America. Average counts at watchsites ranged from 2,000 to 15,000 migrants each autumn, with as many as 21 species represented. Five species consistently made up more than 80% of the annual combined- site count totals: Sharp-shinned Hawk ( Accipiter striatus), 25-30% of the total in a given yea...

We determined the occupancy, productivity, turnover, and dispersal distances of Northern Goshawks (Accipiter gentilis) in two areas of the northern Great Basin in northeastern Nevada and southern Idaho from 1992-2003. Occupancy of nesting territories declined in both study areas over the 10-11 yr study period but the decline was statistically signi...

Intraspecific patterns of autumn migration timing are not well known, particularly in the western United States. Here, we (1) describe autumn migration timing and age ratios of landbird migrants in southwestern Idaho, (2) examine differences in timing among age and sex classes, and (3) demonstrate how prebasic molt strategies affect migration timin...

The topography of western North America provides a complex landscape for landbird migrants, and stopover patterns in this region are poorly understood. We examined seven years of stopover data (1997-2003) from a montane area in southwestern Idaho to determine whether this area provides suitable stopover habitat. We compared the proportion of birds...

The topography of western North America provides a complex landscape for landbird migrants, and stopover patterns in this region are poorly understood. We examined seven years of stopover data (1997–2003) from a montane area in southwestern Idaho to determine whether this area provides suitable stopover habitat. We compared the proportion of birds...

We used count surveys and mist-net captures to compare habitat associations, relative abundance, species richness, and community similarity of migrant landbirds among four major habitats in the Boise Foothills of southwestern Idaho. Count surveys were conducted from August through October 1997–2000 in conifer forest, mountain shrubland, shrubsteppe...

We studied Bald Eagle foraging ecology on the South Fork Boise River, Idaho, during the winters of 1990-92. We compared habitat variables at 29 foraging sites, 94 perch sites, and 131 random sites. Habitat variables included river habitat (pool, riffle, run), distance to the nearest change in river habitat, distance to nearest available perch, numb...

Identifying important stopover areas is a critical step in conserva- tion and management of migratory birds, and relatively little effort has been directed toward this task in Idaho or the Intermountain West. We used mist-net captures to describe the relative abundance, species richness, and community similarity of autumn migrant landbirds in the B...