Publications

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lyme disease and migrating birds in the saint croix river valley.during a study of migrating land birds in 1987, we examined over 9,200 individual birds representing 99 species from the saint croix river valley, a lyme disease-endemic area of east central minnesota and northwestern wisconsin. we found that 250 deer tick (ixodes dammini) larvae and nymphs infested 58 birds from 15 migrant species; 56 ticks (22.4%) were positive for the lyme disease spirochete borrelia burgdorferi. five ground-foraging migrant bird species favoring mesic habitats, veery (cathar ...19892782872
tick infestations of birds in coastal georgia and alabama.mist-netted birds were examined for ticks on jekyll island, glynn co., georgia (32 bird species) in 1996-1998, and at fort morgan, baldwin co., alabama (36 species) in 1998 during fall migration. sixty-two (14.7%) of 423 birds from jekyll island and 22 (13.3%) of 165 birds from fort morgan were infested with ticks. the mean number of ticks per infested bird was 2.0 on jekyll island and 6.3 at fort morgan. ten species of birds were infested with ticks on jekyl1 island where 87% of all ticks were ...200010780541
interspecific variability of prevalence in blood parasites of adult passerine birds during the breeding season in alaska.blood parasite prevalence based on microscopic examination of stained blood smears was determined in adults of 11 passerine bird species sampled during their breeding season (may and june 1997-98) in interior alaska (usa). these species included primarily nearctic migratory species such as the dark-eyed junco (junco hyemalis) and neotropical migratory species such as the blackpoll warbler (dendroica striata), alder flycatcher (empidonax alnorum), swainson's thrush (catharus ustulatus), northern ...200111272501
organophosphate pesticide method development and presence of chlorpyrifos in the feet of nearctic-neotropical migratory songbirds from canada that over-winter in central america agricultural areas.recent modeling analysis suggests that numerous birds may be at risk of acute poisoning in insecticide-treated fields. although the majority of avian field studies on pesticides have focused on treated seed, granule, insect or vegetation (oral exposure) ingestion, dermal exposure is an important exposure route when birds come into contact with deposited pesticides on foliage and other surfaces. some nearctic-neotropical migratory songbirds are likely exposed to pesticides on their non-breeding h ...201626421621
insight into the species diversity of the quill mite genus betasyringophiloidus skoracki, 2011 (prostigmata: syringophilidae) on the basis of the dna barcodes.betasyringophiloidus skoracki, 2011 is a genus of quill mites (prostigmata: syringophilidae) that is believed to contain mono-, steno- and polyxenous parasites associated with a wide range of passerine birds (passeriformes) across the world. in this work we applied the dna-barcode marker (mitochondrial cytochrome c oxidase subunit i gene fragment, coi) to verify whether betasyringophiloidus schoeniclus (skoracki, 2002) and betasyringophiloidus seiuri (clark, 1964) are actual steno- and polyxenou ...201931366736
relationships between behavior, physiology and weather in avian transients at a migration stopover site.populations of avian transients were studied at a stopover area in southern texas during four consecutive migration seasons, fall, 1973-spring, 1975. we captured individuals by mist net for banding and fat level determination. concurrently we made observations on behavior of free-flying birds.we worked intensively with a single species, the northern waterthrush (seiurus noveboracensis) while gathering weight fat and behavioral data on other species as well. many of the patterns of weight change ...197628309583
moisture as a determinant of habitat quality for a nonbreeding neotropical migratory songbird.identifying the determinants of habitat quality for a species is essential for understanding how populations are limited and regulated. spatiotemporal variation in moisture and its influence on food availability may drive patterns of habitat occupancy and demographic outcomes. nonbreeding migratory birds in the neotropics occupy a range of habitat types that vary with respect to moisture. using carbon isotopes and a satellite-derived measure of habitat moisture, we identified a moisture gradient ...201021058548
magnetic information calibrates celestial cues during migration.migratory birds use celestial and geomagnetic directional information to orient on their way between breeding and wintering areas. cue-conflict experiments involving these two orientation cue systems have shown that directional information can be transferred from one system to the other by calibration. we designed experiments with four species of north american songbirds to: (1) examine whether these species calibrate orientation information from one system to the other; and (2) determine whethe ...200011032648
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