Publications

can you hear me now? the effect of signal degradation on perceived predator threat in black-capped chickadees (poecile atricapillus).	avian predators vary in their degree-of-threat to chickadees; for example, smaller owls and hawks are of higher threat to chickadees as they can easily maneuver through the trees, while larger predators cannot. we conducted an operant go/no-go discrimination task to investigate the effect of signal degradation on perceived threat. chickadees were trained to respond to high-threat northern saw-whet owl (nswo) or low-threat great horned owl (ghow) calls that were recorded at short distances, and t ...	2020	32980944
hearing in 3d: directional auditory sensitivity of northern saw-whet owls (aegolius acadicus).	northern saw-whet owls (aegolius acadicus) are nocturnal predators that are able to acoustically localize prey with great accuracy; an ability that is attributed to their unique asymmetrical ear structure. while a great deal of research has focused on open loop sound localization prior to flight in owls (primarily barn owls), directional sensitivity of the ears may also be important in locating moving prey on the wing. furthermore, directionally sensitive ears may also reduce the effects of mask ...	2020	32359136
bilateral anterior uveitis in a northern saw-whet owl (aegolius acadicus) with a metastatic pectoral malignant mesenchymoma.	a captive, adult, male northern saw-whet owl (aegolius acadicus) was examined for blepharospasm of the left eye. the owl was diagnosed with bilateral anterior uveitis and a corneal ulceration in the left eye. it was treated with oral and topical nonsteroidal anti-inflammatory medications and a topical antibiotic. multiple recheck examinations and medication adjustments were performed over the next 4 months, at the end of which time the bilateral anterior uveitis was controlled with a topical non ...	2019	31251505
eimeria aegoliusia n. sp. (sporozoa: eimeriidae) from the northern saw-whet owl aegolius acadicus (gmelin) (strigiformes: strigidae) in mexico.	a new coccidian species (chromista: sporozoa: eimeriidae) collected from the northern saw-whet owl aegolius acadicus (gmelin) is reported from mexico. eimeria aegoliusia n. sp. has subspherical oöcysts, with smooth, bi-layered wall. micropyle and oöcyst residuum are both absent and a polar granule is present. to date, eight species of eimeria schneider, 1875 have been described from strigiform birds. mean dimensions of sporulated oöcysts (23.7 × 22.4 µm) and sporocysts (12.8 × 8.3 µm) appear to ...	2019	31089939
effects of presentation rate and onset time on auditory brainstem responses in northern saw-whet owls (aegolius acadicus).	monitoring auditory brainstem responses (abrs) is a common method of assessing auditory processing in non-model species. although abrs are widely used to compare auditory abilities across taxa, the extent to which different features of acoustic stimuli affect the abr is largely unknown in most non-mammalian species. the authors investigated the effects of varying presentation rate and onset time to determine how different features of acoustic stimuli influence the abr in northern saw-whet owls ( ...	2019	31046339
frequency sensitivity in northern saw-whet owls (aegolius acadicus).	northern saw-whet owls (aegolius acadicus) are known for their unique asymmetrical ear structure and ability to localize prey acoustically, yet few attempts have been made to explore the auditory capabilities of this species. in this study, we evoked auditory brainstem responses (abrs) with tonebursts to assess three main hypotheses regarding the evolution of auditory sensitivity: sender-receiver matching, ecological constraints, and phylogenetic/morphological constraints. we found that abr ampl ...	2018	28993864
resource partitioning among forest owls in the river of no return wilderness, idaho.	we studied resource partitioning among the forest owls in the river of no return wilderness, idaho, during the winter and spring of 1980 and 1981. the owl assemblage consisted of five abundant species: pygmy (glaucidium gnoma), saw-whet (aegolius acadicus), boreal (a. funereus), western screech (otus kennicottii), and great-horned (bubo virginianus). long-eared (asio otus) and flammulated (o. flammeolus) owls were rarely observed. information from the literature supplemented our data to describe ...	1988	28310843
biomarkers of animal health: integrating nutritional ecology, endocrine ecophysiology, ecoimmunology, and geospatial ecology.	diverse biomarkers including stable isotope, hormonal, and ecoimmunological assays are powerful tools to assess animal condition. however, an integrative approach is necessary to provide the context essential to understanding how biomarkers reveal animal health in varied ecological conditions. a barrier to such integration is a general lack of awareness of how shared extraction methods from across fields can provide material from the same animal tissues for diverse biomarker assays. in addition, ...	2015	25691980
laboratory blood analysis in strigiformes-part i: hematologic reference intervals and agreement between manual blood cell counting techniques.	while hematologic reference intervals (ri) are available for multiple raptorial species of the order accipitriformes and falconiformes, there is a lack of valuable hematologic information in strigiformes that can be used for diagnostic and health monitoring purposes.	2015	25627556
laboratory blood analysis in strigiformes-part ii: plasma biochemistry reference intervals and agreement between the abaxis vetscan v2 and the roche cobas c501.	limited plasma biochemical information is available in strigiformes. only one study investigated the agreement between a point-of-care with a reference laboratory analyzer for biochemistry variables in birds.	2015	25613649
mites of the subfamily harpirhynchinae (acariformes: harpirhynchidae) from north american birds.	three new harpirhynchid species of the subfamily harpirhynchinae (acariformes: harpirhynchidae) are described from north american birds: harpyrhynchoides aegolius sp. n. from aegolius acadicus (strigiformes: strigidae), harpyrhynchoides accipiter sp. n. from accipiter striatus (accipitriformes: accipitridae), and neharpyrhynchus icterus sp. n. from icterus galbula (passeriformes: icteridae). three species are recorded from new hosts from north america for the first time: harpyrhynchoides trachea ...	2013	23802444
survey of blood parasites in two forest owls, northern saw-whet owls and flammulated owls, of western north america.	except for a few studies in the eastern united states, little has been published on hemoparasites in owls. we surveyed the blood parasites of 108 northern saw-whet owls (aegolius acadicus) and 24 flammulated owls (otus flammeolus) in idaho during autumn migration in 1999 and 2000. we also surveyed 15 flammulated owls (flow) during breeding season in utah from 2000. leucocytozoon ziemanni, haemoproteus syrnii, haemoproteus noctuae, and trypanosoma avium were identified. the overall prevalence of ...	2008	18436683
the visual response properties of neurons in the nucleus of the basal optic root of the northern saw-whet owl (aegolius acadicus).	the nucleus of the basal optic root (nbor) in birds is a component of the accessory optic system (aos) which is involved in the analysis of visual flowfields normally resulting from self-motion. using standard extracellular techniques, we recorded from 81 single-unit and multi-unit clusters in the nbor of the northern saw-whet owl, aegolius acadicus, an avian species that has a visual system with frontal emphasis. these cells responded best to large patterns of random dots moving either upward ( ...	1994	8306188
insects parasitic on the saw-whet owl, aegolius acadicus (gmelin) (aves: strigidae).		1971	5165021