Colleen Handel, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 90
Biogeography of boreal passerine range dynamics in western North America: past, present, and future
Many of the Neotropical migrant bird species that breed throughout the Canadian boreal region are not found in the Alaskan boreal region, separated by the northwestern cordilleran mountains, despite the presence of climatically suitable habitat. We asked whether biological or climatic factors constrain certain species from crossing this geographic barrier. Analyzing a comprehensive dataset for 80
Authors
Diana Stralberg, Steven M. Matsuoka, Colleen M. Handel, Fiona K.A. Schmiegelow, Andreas Hamann, Erin M. Bayne
Elements in whole blood of Northwestern Crows (Corvus caurinus) in Alaska: No evidence for an association with beak deformities
A recent outbreak of beak deformities among resident birds in Alaska has raised concern about environmental contamination as a possible underlying factor. We measured whole blood concentrations of 30 essential and nonessential elements to determine whether any were associated with beak deformities in Northwestern Crows (Corvus caurinus). We tested for differences between 1) adults with versus thos
Authors
Caroline R. Van Hemert, Colleen M. Handel
Avian malaria in a boreal resident species: long-term temporal variability, and increased prevalence in birds with avian keratin disorder
The prevalence of vector-borne parasitic diseases is widely influenced by biological and ecological factors. Environmental conditions such as temperature and precipitation can have a marked effect on haemosporidian parasites (Plasmodium spp.) that cause malaria and those that cause other malaria-like diseases in birds. However, there have been few long-term studies monitoring haemosporidian infect
Authors
Laura C. Wilkinson, Colleen M. Handel, Caroline R. Van Hemert, Claire Loiseau, Ravinder N. M. Sehgal
Novel picornavirus associated with avian keratin disorder in Alaskan birds
Avian keratin disorder (AKD), characterized by debilitating overgrowth of the avian beak, was first documented in black-capped chickadees (Poecile atricapillus) in Alaska. Subsequently, similar deformities have appeared in numerous species across continents. Despite the widespread distribution of this emerging pathology, the cause of AKD remains elusive. As a result, it is unknown whether suspecte
Authors
Maxine Zylberberg, Caroline R. Van Hemert, John P. Dumbacher, Colleen M. Handel, Tarik Tihan, Joseph L. DeRisi
Isolation of a complete circular virus genome sequence from an Alaskan black-capped chickadee (Poecile atricapillus) gastrointestinal tract sample.
We report here the genome sequence of a circular virus isolated from samples of an Alaskan black-capped chickadee (Poecile atricapillus) gastrointestinal tract. The genome is 2,152 bp in length and is most similar (30 to 44.5% amino acid identity) to the genome sequences of other single-stranded DNA (ssDNA) circular viruses belonging to the gemycircularvirus group.
Authors
Zachary R. Hanna, Charles Runckel, Jerome Fuchs, Joseph L. DeRisi, David P. Mindell, Caroline R. Van Hemert, Colleen M. Handel, John P. Dumbacher
Evaluating species richness: biased ecological inference results from spatial heterogeneity in species detection probabilities
Accurate estimates of species richness are necessary to test predictions of ecological theory and evaluate biodiversity for conservation purposes. However, species richness is difficult to measure in the field because some species will almost always be overlooked due to their cryptic nature or the observer's failure to perceive their cues. Common measures of species richness that assume consistent
Authors
Lance B. McNew, Colleen M. Handel
Projected changes in wildlife habitats in Arctic natural areas of northwest Alaska
We project the effects of transitional changes among 60 vegetation and other land cover types (“ecotypes”) in northwest Alaska over the 21st century on habitats of 162 bird and 39 mammal species known or expected to occur regularly in the region. This analysis, encompassing a broad suite of arctic and boreal wildlife species, entailed building wildlife-habitat matrices denoting levels of use of ea
Authors
Bruce G. Marcot, M. Torre Jorgenson, James P. Lawler, Colleen M. Handel, Anthony R. DeGange
Environmental contaminants and chromosomal damage associated with beak deformities in a resident North American passerine
A large cluster of beak abnormalities among black-capped chickadees (Poecile atricapillus) in Alaska raised concern about underlying environmental factors in this region. Metals and trace elements, organochlorine pesticides, polychlorinated biphenyls (PCBs), and polychlorinated dibenzo-dioxins and polychlorinated dibenzofurans (PCDD-Fs) were analyzed in adults, nestlings, and eggs of the affected
Authors
Colleen M. Handel, Caroline R. Van Hemert
Ways to be different: Foraging adaptations that facilitate higher intake rates in a northerly wintering shorebird compared with a low-latitude conspecific
At what phenotypic level do closely related subspecies that live in different environments differ with respect to food detection, ingestion and processing? This question motivated an experimental study on rock sandpipers (Calidris ptilocnemis). The species' nonbreeding range spans 20 deg of latitude, the extremes of which are inhabited by two subspecies: C. p. ptilocnemis that winters primarily in
Authors
Daniel R. Ruthrauff, Anne Dekinga, Robert E. Gill, Jan A. van Gils, Theunis Piersma
Melanin-based color of plumage: role of condition and of feathers' microstructure
Whether melanin-based colors honestly signal a bird's condition during the growth of feathers is controversial, and it is unclear if or how the physiological processes underlying melanogenesis or color-imparting structural feather microstructure may be adversely affected by condition. Here we report results from two experiments designed to measure the effect of condition on expression of eumelanic
Authors
Liliana D'Alba, Caroline R. Van Hemert, Karen A. Spencer, Britt J. Heidinger, Lisa Gill, Neil P. Evans, Pat Monaghan, Colleen M. Handel, Matthew D. Shawkey
A hierarchical model combining distance sampling and time removal to estimate detection probability during avian point counts
Imperfect detection during animal surveys biases estimates of abundance and can lead to improper conclusions regarding distribution and population trends. Farnsworth et al. (2005) developed a combined distance-sampling and time-removal model for point-transect surveys that addresses both availability (the probability that an animal is available for detection; e.g., that a bird sings) and perceptib
Authors
Courtney L. Amundson, J. Andrew Royle, Colleen M. Handel
Avian influenza virus antibodies in Pacific Coast Red Knots (Calidris canutus rufa)
Prevalence of avian influenza virus (AIV) antibodies in the western Atlantic subspecies of Red Knot (Calidris canutus rufa) is among the highest for any shorebird. To assess whether the frequency of detection of AIV antibodies is high for the species in general or restricted only to C. c. rufa, we sampled the northeastern Pacific Coast subspecies of Red Knot (Calidris canutus roselaari) breeding i
Authors
James A. Johnson, Lucas H. DeCicco, Daniel R. Ruthrauff, Scott Krauss, Jeffrey S. Hall
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Science and Products
Filter Total Items: 90
Biogeography of boreal passerine range dynamics in western North America: past, present, and future
Many of the Neotropical migrant bird species that breed throughout the Canadian boreal region are not found in the Alaskan boreal region, separated by the northwestern cordilleran mountains, despite the presence of climatically suitable habitat. We asked whether biological or climatic factors constrain certain species from crossing this geographic barrier. Analyzing a comprehensive dataset for 80
Authors
Diana Stralberg, Steven M. Matsuoka, Colleen M. Handel, Fiona K.A. Schmiegelow, Andreas Hamann, Erin M. Bayne
Elements in whole blood of Northwestern Crows (Corvus caurinus) in Alaska: No evidence for an association with beak deformities
A recent outbreak of beak deformities among resident birds in Alaska has raised concern about environmental contamination as a possible underlying factor. We measured whole blood concentrations of 30 essential and nonessential elements to determine whether any were associated with beak deformities in Northwestern Crows (Corvus caurinus). We tested for differences between 1) adults with versus thos
Authors
Caroline R. Van Hemert, Colleen M. Handel
Avian malaria in a boreal resident species: long-term temporal variability, and increased prevalence in birds with avian keratin disorder
The prevalence of vector-borne parasitic diseases is widely influenced by biological and ecological factors. Environmental conditions such as temperature and precipitation can have a marked effect on haemosporidian parasites (Plasmodium spp.) that cause malaria and those that cause other malaria-like diseases in birds. However, there have been few long-term studies monitoring haemosporidian infect
Authors
Laura C. Wilkinson, Colleen M. Handel, Caroline R. Van Hemert, Claire Loiseau, Ravinder N. M. Sehgal
Novel picornavirus associated with avian keratin disorder in Alaskan birds
Avian keratin disorder (AKD), characterized by debilitating overgrowth of the avian beak, was first documented in black-capped chickadees (Poecile atricapillus) in Alaska. Subsequently, similar deformities have appeared in numerous species across continents. Despite the widespread distribution of this emerging pathology, the cause of AKD remains elusive. As a result, it is unknown whether suspecte
Authors
Maxine Zylberberg, Caroline R. Van Hemert, John P. Dumbacher, Colleen M. Handel, Tarik Tihan, Joseph L. DeRisi
Isolation of a complete circular virus genome sequence from an Alaskan black-capped chickadee (Poecile atricapillus) gastrointestinal tract sample.
We report here the genome sequence of a circular virus isolated from samples of an Alaskan black-capped chickadee (Poecile atricapillus) gastrointestinal tract. The genome is 2,152 bp in length and is most similar (30 to 44.5% amino acid identity) to the genome sequences of other single-stranded DNA (ssDNA) circular viruses belonging to the gemycircularvirus group.
Authors
Zachary R. Hanna, Charles Runckel, Jerome Fuchs, Joseph L. DeRisi, David P. Mindell, Caroline R. Van Hemert, Colleen M. Handel, John P. Dumbacher
Evaluating species richness: biased ecological inference results from spatial heterogeneity in species detection probabilities
Accurate estimates of species richness are necessary to test predictions of ecological theory and evaluate biodiversity for conservation purposes. However, species richness is difficult to measure in the field because some species will almost always be overlooked due to their cryptic nature or the observer's failure to perceive their cues. Common measures of species richness that assume consistent
Authors
Lance B. McNew, Colleen M. Handel
Projected changes in wildlife habitats in Arctic natural areas of northwest Alaska
We project the effects of transitional changes among 60 vegetation and other land cover types (“ecotypes”) in northwest Alaska over the 21st century on habitats of 162 bird and 39 mammal species known or expected to occur regularly in the region. This analysis, encompassing a broad suite of arctic and boreal wildlife species, entailed building wildlife-habitat matrices denoting levels of use of ea
Authors
Bruce G. Marcot, M. Torre Jorgenson, James P. Lawler, Colleen M. Handel, Anthony R. DeGange
Environmental contaminants and chromosomal damage associated with beak deformities in a resident North American passerine
A large cluster of beak abnormalities among black-capped chickadees (Poecile atricapillus) in Alaska raised concern about underlying environmental factors in this region. Metals and trace elements, organochlorine pesticides, polychlorinated biphenyls (PCBs), and polychlorinated dibenzo-dioxins and polychlorinated dibenzofurans (PCDD-Fs) were analyzed in adults, nestlings, and eggs of the affected
Authors
Colleen M. Handel, Caroline R. Van Hemert
Ways to be different: Foraging adaptations that facilitate higher intake rates in a northerly wintering shorebird compared with a low-latitude conspecific
At what phenotypic level do closely related subspecies that live in different environments differ with respect to food detection, ingestion and processing? This question motivated an experimental study on rock sandpipers (Calidris ptilocnemis). The species' nonbreeding range spans 20 deg of latitude, the extremes of which are inhabited by two subspecies: C. p. ptilocnemis that winters primarily in
Authors
Daniel R. Ruthrauff, Anne Dekinga, Robert E. Gill, Jan A. van Gils, Theunis Piersma
Melanin-based color of plumage: role of condition and of feathers' microstructure
Whether melanin-based colors honestly signal a bird's condition during the growth of feathers is controversial, and it is unclear if or how the physiological processes underlying melanogenesis or color-imparting structural feather microstructure may be adversely affected by condition. Here we report results from two experiments designed to measure the effect of condition on expression of eumelanic
Authors
Liliana D'Alba, Caroline R. Van Hemert, Karen A. Spencer, Britt J. Heidinger, Lisa Gill, Neil P. Evans, Pat Monaghan, Colleen M. Handel, Matthew D. Shawkey
A hierarchical model combining distance sampling and time removal to estimate detection probability during avian point counts
Imperfect detection during animal surveys biases estimates of abundance and can lead to improper conclusions regarding distribution and population trends. Farnsworth et al. (2005) developed a combined distance-sampling and time-removal model for point-transect surveys that addresses both availability (the probability that an animal is available for detection; e.g., that a bird sings) and perceptib
Authors
Courtney L. Amundson, J. Andrew Royle, Colleen M. Handel
Avian influenza virus antibodies in Pacific Coast Red Knots (Calidris canutus rufa)
Prevalence of avian influenza virus (AIV) antibodies in the western Atlantic subspecies of Red Knot (Calidris canutus rufa) is among the highest for any shorebird. To assess whether the frequency of detection of AIV antibodies is high for the species in general or restricted only to C. c. rufa, we sampled the northeastern Pacific Coast subspecies of Red Knot (Calidris canutus roselaari) breeding i
Authors
James A. Johnson, Lucas H. DeCicco, Daniel R. Ruthrauff, Scott Krauss, Jeffrey S. Hall
Filter Total Items: 21
Filter Total Items: 14
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