Publications

temporal pattern of nocturnal activity of a caged fox sparrow.		1967	6055107
the geography of mitochondrial dna variation in two sympatric sparrows.	geographic variation in mitochondrial dna (mtdna) restriction sites was studied in samples of two sympatric passerine birds, fox (passerella iliaca) and song (melospiza melodia) sparrows, collected at the same sites in the western united states. different levels of variation and differentiation were observed in each species. in 46 fox sparrows taken at nine sites, five clones were observed, partitioned into two distinct east-west groups that meet at the great basin-sierra nevada interface; perce ...	1991	28567872
the geography of mitochondrial dna variation, population structure, hybridization, and species limits in the fox sparrow (passerella iliaca).	geographic variation in mitochondrial dna (mtdna) restriction sites was studied in the fox sparrow (passerella iliaca). seventy-eight haplotypes were found. haplotypes fall into four phylogeographic groups that correspond to groups defined by plumage characters. the geographic distribution of these four groups does not appear congruent with mtdna patterns in other vertebrates. within each group, there is little geographic variation in mtdna restriction sites, although there is geographic variati ...	1994	28567786
comparative phylogeography in north american birds.	modern molecular methods yield descriptions of the phylogenetic deployment of genetic variation within species, or phylogeography. a developing field is the comparison of geographic patterns of genetic variation in codistributed species, or comparative phylogeography. one determines whether species that currently share the same broad area exhibit congruent phylogeographic patterns, which would indicate that they were historically codistributed and differentiated in response to same geological or ...	1996	28568862
a phylogenetic analysis of the emberizid sparrows based on three mitochondrial genes.	previous molecular phylogenetic studies have examined the taxonomic relationships among a number of typical emberizid sparrow genera. to help clarify these relationships, we sequenced a 1673 base pair fragment for the complete sequence of three mitochondrial genes: adenosine triphosphatase (atp8 and atp6) and cytochrome oxidase subunit iii (coiii) for 38 sparrow species, along with passerina amoena (cardinalidae) and piranga ludoviciana (thraupidae) which were selected as the outgroups. our anal ...	2003	12967606
migratory songbirds disperse ticks across canada, and first isolation of the lyme disease spirochete, borrelia burgdorferi, from the avian tick, ixodes auritulus.	during a 3-yr comprehensive study, 196 ixodid ticks (9 species) were collected from 89 passerine birds (32 species) from 25 localities across canada to determine the distribution of avian-associated tick species and endogenous lyme disease spirochetes, borrelia burgdorferi johnson, schmid, hyde, steigerwalt, and brenner. we report the following first records of tick parasitism on avian hosts: the rabbit-associated tick, ixodes dentatus marx, from manitoba and ontario; the mouse tick, ixodes muri ...	2005	17089744
redescription of monorcholepis dujardini (krabbe, 1869) and m. passerellae (webster, 1952) (cestoda: cyclophyllidea: aploparaksidae) in passerine birds from the holarctic region.	two species of avian tapeworms, monorcholepis dujardini (krabbe, 1869) and m. passerellae (webster, 1952), of the cyclophyllidean family aploparaksidae mayhew, 1925 (earlier included in the hymenolepididae) are redescribed. relative to congeners, the morphology of the strobila of both species shows strong similarities including a unique form of the cirrus. separation of these species, however, can be based on the number (40-53 and 25-31, respectively) and size (18-25 microm and 14-18 microm) of ...	2007	17441439
associations between heterozygosity and morphological variance.	recent studies have contrasted the expression of phenotypic traits, such as variance in morphological characters, with levels of genetic variation (heterozygosity) as determined by electrophoretic analysis of protein-coding loci. the theoretical basis for interpreting significant covariation stems in part from lerner's work on genetic homeostasis, which predicts that within populations increased heterozygosity will produce decreased morphological variance, owing to a buffering effect of heterosi ...	2008	4086785
use of data on avian demographics and site persistence during overwintering to assess quality of restored riparian habitat.	monitoring responses by birds to restoration of riparian vegetation is relatively cost-effective, but in most assessments species-specific abundances, not demography, are monitored. data on birds collected during the nonbreeding season are particularly lacking. we captured birds in mist nets and resighted banded birds to estimate species richness and diversity, abundance, demographic indexes, and site-level persistence of permanent-resident and overwintering migrants in remnant and restored ripa ...	2012	22443304
extensive distribution of the lyme disease bacterium, borrelia burgdorferi sensu lato, in multiple tick species parasitizing avian and mammalian hosts across canada.	lyme disease, caused by the spirochetal bacterium, borrelia burgdorferi sensu lato (bbsl), is typically transmitted by hard-bodied ticks (acari: ixodidae). whenever this tick-borne zoonosis is mentioned in medical clinics and emergency rooms, it sparks a firestorm of controversy. denial often sets in, and healthcare practitioners dismiss the fact that this pathogenic spirochetosis is present in their area. for distribution of bbsl across canada, we conducted a 4-year, tick⁻host study (2013⁻2016) ...	2018	30424543
the recent expansion of fox sparrow (passerella iliaca iliaca) breeding range into the northeastern united states.	the breeding range of the eastern fox sparrow (passerella iliaca iliaca) is generally recognized as comprising the boreal forest of canada. however, recent observations suggest that the species is present during the summer months throughout much of the northeastern us, unexpected for a species characterized as a passage migrant in the region. to clarify, i conducted a literature review to document the historical status of the species in the northeastern us and then analyzed observations submitte ...	2018	30581676
demographic consequences of invasion by a native, controphic competitor to an insular bird population.	species invasions and range shifts can lead to novel competitive interactions between historically resident and colonizing species, but the demographic consequences of such interactions remain controversial. we present results from field experiments and 45 years of demographic monitoring to test the hypothesis that the colonization of mandarte is., bc, canada, by fox sparrows (passerella iliaca) caused the long-term decline of the resident population of song sparrows (melospiza melodia). several ...	2018	29500488