Publications

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birds of a high-altitude cloud forest in alta verapaz, guatemala.the northern central american highlands have been recognized as endemic bird area, but little is known about bird communities in guatemalan cloud forests. from 1997 to 2001 a total of 142 bird species were recorded between 2000 and 2400 masl in cloud forest and agricultural clearings on montaña caquipec (alta verapaz, guatemala). the bird community is described based on line transect counts within the forest. pooling census data from undisturbed and disturbed forest, the gray-breasted wood-wren ...200517354466
quill mites of the genus syringophilopsis kethley, 1970 (acari: syringophilidae) from north american birds.seven mite species belonging to the genus syringophilopsis kethley, 1970 (acari: prostigmata: cheyletoidea) are recorded from 10 passeriform host species from the usa. three new species are described and illustrated: syringophilopsis polioptilus sp. n. from polioptila caerulea (linnaeus) (polioptilidae); s. empidonax sp. n. from empidonax hamrnmondii (vesey) and empidonax wrightii baird (tyrannidae); and s. sialiae sp. n. from sialia mexicana swainson (turdidae). in addition, records of new host ...200819175207
the role of color in expert object recognition.in the current study, we examined how color knowledge in a domain of expertise influences the accuracy and speed of object recognition. in experiment 1, expert bird-watchers and novice participants categorized common birds (e.g., robin, sparrow, cardinal) at the family level of abstraction. the bird images were shown in their natural congruent color, nonnatural incongruent color, and gray scale. the main finding was that color affected the performance of bird experts and bird novices, albeit in ...201425113021
modeling the flocking propensity of passerine birds in two neotropical habitats.we examined the importance of mixed-species flock abundance, individual bird home range size, foraging height, and foraging patch characteristics in predicting the propensity for five neotropical passerine bird species (slaty antwren, myrmotherula schisticolor; golden-crowned warbler, basileuterus culicivorus; slate-throated redstart, myioborus miniatus; wilson's warbler, wilsonia pusilla; and black-and-white warbler, mniotilta varia) to forage within flocks, rather than solitarily. we used stud ...200717375332
songbird response to increased willow (salix spp.) growth in yellowstone's northern range.after nearly a century of height suppression, willows (salix spp.) in the northern range of yellowstone national park, u.s.a., are increasing in height growth as a possible consequence of wolf (canis lupus) restoration, climate change, or other factors. regardless of the drivers, the recent release of this rare but important habitat type could have significant implications for associated songbirds that are exhibiting declines in the region. our objective was to evaluate bird response to releasin ...201121939061
adcyap1 polymorphism covaries with breeding latitude in a nearctic migratory songbird, the wilson's warbler (cardellina pusilla).understanding the genetic background of complex behavioral traits, showing multigenic control and extensive environmental effects, is a challenging task. among such traits, migration is known to show a large additive genetic component. yet, the identification of specific genes or gene regions explaining phenotypic variance in migratory behavior has received less attention. migration ultimately depends on seasonal cycles, and polymorphism at phenological candidate genes may underlie variation in ...201627252831
the role of spatial frequency in expert object recognition.novices recognize objects at the basic-category level (e.g., dog, chair, and bird) at which identification is based on the global form of the objects (rosch, mervis, gray, johnson, & boyes-braem, 1976). in contrast, experts recognize objects within their domain of expertise at the subordinate level (e.g., sparrow or finch) for which the internal object information may play an important role in identification (tanaka & taylor, 1991). to investigate whether expert recognition relies on internal ob ...201626480250
mapping migration in a songbird using high-resolution genetic markers.neotropic migratory birds are declining across the western hemisphere, but conservation efforts have been hampered by the inability to assess where migrants are most limited-the breeding grounds, migratory stopover sites or wintering areas. a major challenge has been the lack of an efficient, reliable and broadly applicable method for measuring the strength of migratory connections between populations across the annual cycle. here, we show how high-resolution genetic markers can be used to ident ...201425346105
combining genetic markers and stable isotopes to reveal population connectivity and migration patterns in a neotropical migrant, wilson's warbler (wilsonia pusilla).we used results from the analysis of microsatellite dna variation and hydrogen stable-isotope ratios to characterize the population structure of a neotropical migrant passerine, the wilson's warbler (wilsonia pusilla). the resulting information was then used to infer migration patterns and population connectivity between breeding grounds in north america and overwintering areas in mexico and central america. the microsatellite data revealed genetic structure across the north american continent; ...200312753204
phylogeographical approaches to assessing demographic connectivity between breeding and overwintering regions in a nearctic-neotropical warbler (wilsonia pusilla).we characterized the pattern and magnitude of phylogeographical variation among breeding populations of a long-distance migratory bird, the wilson's warbler (wilsonia pusilla), and used this information to assess the utility of mtdna markers for assaying demographic connectivity between breeding and overwintering regions. we found a complex pattern of population differentiation in mitochondrial dna (mtdna) variation among populations across the breeding range. individuals from eastern north amer ...200212207712
novel statistical methods for integrating genetic and stable isotope data to infer individual-level migratory connectivity.methods for determining patterns of migratory connectivity in animal ecology have historically been limited due to logistical challenges. recent progress in studying migratory bird connectivity has been made using genetic and stable-isotope markers to assign migratory individuals to their breeding grounds. here, we present a novel bayesian approach to jointly leverage genetic and isotopic markers and we test its utility on two migratory passerine bird species. our approach represents a principle ...201323906339
genetic variation and seasonal migratory connectivity in wilson's warblers (wilsonia pusilla): species-level differences in nuclear dna between western and eastern populations.there is growing interest in understanding patterns of seasonal migratory connectivity between breeding and wintering sites, both because differences in migratory behaviour can be associated with population differentiation and because knowledge of migratory connectivity is essential for understanding the ecology, evolution and conservation of migratory species. we present the first broad survey of geographic variation in the nuclear genome of breeding and wintering wilson's warblers (wilsonia pu ...201121689190
insights into wilson's warbler migration from analyses of hydrogen stable-isotope ratios.our ability to link the breeding locations of individual passerines to migration stopover sites and wintering locations is limited. stable isotopes of hydrogen contained in bird feathers have recently shown potential in this regard. we measured hydrogen stable-isotope ratios (δd) of feathers from breeding, migrating, and wintering wilson's warblers. analyses of feathers from museum specimens collected throughout the western portion of the breeding range indicate that δd values are significantly ...200228547144
a genoscape-network model for conservation prioritization in a migratory bird.migratory animals are declining worldwide and coordinated conservation efforts are needed to reverse current trends. we devised a novel genoscape-network model that combines genetic analyses with species distribution modeling and demographic data to overcome challenges with conceptualizing alternative risk factors in migratory species across their full annual cycle. we applied our method to the long distance, neotropical migratory bird, wilson's warbler (cardellina pusilla). despite a lack of da ...202032391608
integrating broad-scale data to assess demographic and climatic contributions to population change in a declining songbird.climate variation and trends affect species distribution and abundance across large spatial extents. however, most studies that predict species response to climate are implemented at small spatial scales or are based on occurrence-environment relationships that lack mechanistic detail. here, we develop an integrated population model (ipm) for multi-site count and capture-recapture data for a declining migratory songbird, wilson's warbler (cardellina pusilla), in three genetically distinct breedi ...202032128118
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