Many authors have suggested that the negative effects of roads on animals are largely owing to traffic noise. Although suggestive, most past studies road noise wildlife were conducted in presence other confounding roads, such as visual disturbance, collisions and chemical pollution among others. We present, our knowledge, first study experimentally apply a roadless area at landscape scale-thus avoiding aspects present studies. replicated sound roadway intervals-alternating 4 days with...

Decades of research demonstrate that roads impact wildlife and suggest traffic noise as a primary cause population declines near roads. We created "phantom road" using an array speakers to apply roadless landscape, directly testing the effect alone on entire songbird community during autumn migration. Thirty-one percent bird avoided phantom road. For individuals stayed despite noise, overall body condition decreased by full SD some species showed change in ability gain when exposed migratory...

Summary 1. The capture of birds using mist nets is a widely utilized technique for monitoring avian populations. While the method assumed to be safe, very few studies have addressed how frequently injuries and mortalities occur associated risks not been formally evaluated. 2. We quantified rates mortality injury at 22 banding organizations in United States Canada used data from five determine what kinds incidents most frequently. Analyses focused on passerines near‐passerines, but other...

Abstract Several past studies have demonstrated the effects of anthropogenic noise on populations animals. Yet, differing by age and subsequent changes in structure are poorly understood. We experimentally tested traffic alone a community migrating birds at fall stopover site south‐western Idaho using an array speakers – creating phantom road that replicated sound roadway without other confounding aspects roads. Both hatch‐year adult were negatively affected having lower capture rates, body...

Our knowledge of avian behaviors during the nonbreeding period still lags behind that breeding season, but last decade has witnessed a proliferation in research yielded significant progress understanding migration patterns North American birds. And, although historically great majority been conducted eastern half continent, there much recent on aspects West. In particular, expanded use techniques such as radar, plasma metabolites, mist-netting, count surveys, stable isotopes, genetic data,...

Migration is a significant event in the annual cycle of many avian species. During migration birds face challenges, including unfamiliar foraging and refuge habitats, resulting much higher rate mortality during than other seasons year. Weather may significantly affect bird's decision to initiate migration, course pace its survival migration. Each these influences impact counts migrating at geographical convergence zones or bottlenecks. It important quantify effect short‐term weather on...

Abstract Patterns of migratory connectivity are increasingly used to understand and manage threats throughout the annual cycle species. Strong refers when individuals from different populations remain spatially separated across cycle, which may expose unique sets conditions that cause differential population trends. However, or groups for species' management often defined a priori based on expert knowledge and/or units, mask important segregation obscure trends their drivers. We compared...

ABSTRACT We describe the deleterious effects of using an antimony potassium tartrate emetic to obtain diet samples from birds, and compare information obtained regurgitated versus fecal in describing diets autumn migrants. also examined dose effectiveness captive Dark-eyed Juncos (Junco hyemalis) subjected same technique used field. Over 70% migrants given at a study site Idaho useful samples. For 5 7 species analyzed, produced significantly more arthropods per sample than samples, one...

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 data (1997–2003) from montane area southwestern Idaho to determine whether suitable habitat. compared the proportion birds recaptured, duration, changes energetic condition within among species between two mist-netting sites located different habitats. recaptured ranged zero over 20%, fewer than 5% individuals were...

Food availability and acquisition are critical components of a stopover site's suitability, but we know relatively little about how changes in food affect the ecology migrating landbirds. We examined fruit arthropod three habitats, studied foraging behavior diet, investigated use versus for passerines through southwestern Idaho autumn. Hemiptera dominated foliage-dwelling communities all whereas Hymenoptera were most numerous among ground-dwelling arthropods. Mountain shrubland had high...

Intraspecific patterns of autumn migration timing are not well known, particularly in the western United States. Here, we (1) describe and age ratios landbird migrants southwestern Idaho, (2) examine differences among sex classes, (3) demonstrate how prebasic molt strategies affect between classes. As a group, Neotropical were most common from late July through early September, whereas temperate mid-September into October. Proportion hatch-year birds was 74.5% for all combined ranged 33.3%...

We used count surveys and mist-net captures to compare habitat associations, relative abundance, species richness, community similarity of migrant landbirds among four major habitats in the Boise Foothills southwestern Idaho. Count were conducted from August through October 1997–2000 conifer forest, mountain shrubland, shrubsteppe, riparian shrubland. compared bird detections for all birds pooled, individual species, three migration strategies: Neotropical, temperate, resident (including...

Abstract Illegal killing of nongame wildlife is a global yet poorly documented problem. The prevalence and ecological consequences illegal are often underestimated or completely unknown. We review the practice legal recreational shooting present data gathered from telemetry, surveys, observations on its association with (birds snakes) within conservation areas in Idaho, USA. In total, 33% telemetered long‐billed curlews ( Numenius americanus ) 59% other bird carcasses found known cause death...

A critical element of diet analysis is species adaptability to alternative prey sources. The breeding-season Northern Goshawks (Accipiter gentilis) includes both mammalian and avian species, varies geographically, often dependent upon tree squirrels the genera Sciurus Tamiasciurus. We studied sources in South Hills south-central Idaho, an area where are naturally absent other frequently important goshawks, such as smaller corvids, uncommon. quantified goshawks using nest cameras surveyed...

We compared the migration ecology of two owl species that exhibit different strategies: Flammulated Owl (Otus flammeolus) and Northern Saw-whet (Aegolius acadicus). During fall 1999–2004, we captured 117 Owls 1433 in southern Boise Mountains southwestern Idaho. These exhibited contrasting seasonal timing body condition. captures peaked mid-September early to mid-October. displayed greater condition than increasing scores during season, whereas had no apparent patterns. Based on captures,...

Miller, R. A., N. Paprocki, M. J. Stuber, C. E. Moulton, and D. Carlisle 2016. Short-eared Owl (Asio flammeus) surveys in the North American Intermountain West: utilizing citizen scientists to conduct monitoring across a broad geographic scale. Avian Conservation Ecology 11(1):3.http://dx.doi.org/10.5751/ACE-00819-110103

Abstract Intraspecific patterns of autumn migration timing are not well known, particularly in the western United States. Here, we (1) describe and age ratios landbird migrants southwestern Idaho, (2) examine differences among sex classes, (3) demonstrate how prebasic molt strategies affect between classes. As a group, Neotropical were most common from late July through early September, whereas temperate mid-September into October. Proportion hatch-year birds was 74.5% for all combined...

While alteration of the migratory habits birds is widely regarded as one most evident ecological effects climate change, studies reporting shifts in migration phenology for long-lived, long-distance migrants have been few. Using time series count data collected southern Spain during autumn migration, we examined magnitude and direction phenological six common species soaring birds. Many current methods investigating change rely on continuous sets; however, these may be unavailable a variety...

Abstract Outdoor recreational use is growing rapidly in the western United States, which increases pressure on multiple‐use public lands. Balancing with conservation goals requires considering spatial and temporal intensity of examining its effects multiple species within an ecosystem. In 2019–2021, we assessed relationship between abundance a dominant prey (Piute ground squirrel [ Urocitellus mollis ]), avian mammalian facultative scavengers that rely squirrels, nesting success...

Forest fragmentation is thought to be partially responsible for declines in many Neotropical migrant birds due the combined effects of higher rates brood parasitism and increased predation near forest edges. A majority forested habitat northern prairie region found riparian corridors, but this native has been much reduced from its historical extent. However, additional woodland nesting established within last century form isolated woodlots on farms. We compared abundance, species richness,...

We developed a habitat suitability model for predicting nest locations of breeding Northern Goshawks (Accipiter gentilis) in the high-elevation mixed forest and shrub-steppe south-central Idaho, USA. used elevation, slope, aspect, ruggedness, distance-to-water, canopy cover, individual bands Landsat imagery as predictors known with logistic regression. found goshawks prefer to gently-sloping, east-facing, non-rugged areas dense aspen lodgepole pine forests low reflectance green (0.53 - 0.61...

Abstract For a colonial‐nesting bird, like the white‐faced ibis ( Plegadis chihi ), landscape surrounding breeding colony can be important. White‐faced must rely on areas outside their for foraging, but this part of life history has received little attention, and management even less so. To address knowledge gap, we conducted road‐based driving surveys randomly selected, spatially balanced sample survey agricultural fields within 22‐km radius 2 largest colonies in Idaho, USA: Market Lake...

Abstract We used count surveys and mist-net captures to compare habitat associations, relative abundance, species richness, community similarity of migrant landbirds among four major habitats in the Boise Foothills southwestern Idaho. Count were conducted from August through October 1997–2000 conifer forest, mountain shrubland, shrubsteppe, riparian shrubland. compared bird detections for all birds pooled, individual species, three migration strategies: Neotropical, temperate, resident...

ABSTRACT Grassland birds have experienced steeper population declines between 1966 and 2015 than any other bird group on the North American continent, migratory grassland may face threats in all stages of their annual cycle. The grassland‐associated long‐billed curlew ( Numenius americanus ) is experiencing regional local portions breeding range. nesting period an important portion cycle when curlews demographic rate limitations from a suite including predators anthropogenic disturbance. We...