Publications

isolation of type a influenza and newcastle disease viruses from migratory waterfowl in the mississippi flyway.	twenty-seven chicken red blood cell agglutinating agents were isolated from 187 tracheal swabbings of apparently healthy migratory mallard ducks (anas platyrhynchos) in the mississippi flyway. twenty-four of the isolants were type a influenza virus; 3 lentogenic newcastle disease viruses were isolated. isolations were not made from either 65 giant canada geese (branta canadensis) or 60 franklins' gulls (larus pipixcan).	1977	924873
isolation of type a influenza and newcastle disease viruses from migratory waterfowl in the mississippi flyway.	twenty-seven chicken red blood cell agglutinating agents were isolated from 187 tracheal swabbings of apparently healthy migratory mallard ducks (anas platyrhynchos) in the mississippi flyway. twenty-four of the isolants were type a influenza virus; 3 lentogenic newcastle disease viruses were isolated. isolations were not made from either 65 giant canada geese (branta canadensis) or 60 franklins' gulls (larus pipixcan).	1977	924873
researches on pseudophyllidea (carus, 1813) in the south of chile. iv occurrence of diphyllobothrium dendriticum (nitzch).	experimental infections were established with diphyllobothrium sp. plerocercoids obtained from salmo gairdneri, a fish introduced at the beginning of the 1900s in the lake region of chile. these permitted us to obtain adult parasites in larus dominicanus and canis familiaris. the histological features of the plerocercoids, their relation to the host, adult pattern and susceptibility of hosts allowed us to determine the presence of diphyllobothrium dendriticum (nitzch) for the first time in south ...	1981	7276504
researches on pseudophyllidea (carus, 1813) in the south of chile. iv occurrence of diphyllobothrium dendriticum (nitzch).	experimental infections were established with diphyllobothrium sp. plerocercoids obtained from salmo gairdneri, a fish introduced at the beginning of the 1900s in the lake region of chile. these permitted us to obtain adult parasites in larus dominicanus and canis familiaris. the histological features of the plerocercoids, their relation to the host, adult pattern and susceptibility of hosts allowed us to determine the presence of diphyllobothrium dendriticum (nitzch) for the first time in south ...	1981	7276504
secondary poisoning of franklin's gulls in texas by monocrotophos.		1985	3981755
heavy metal and selenium levels in franklin's gull (larus pipixcan) parents and their eggs.	lead, cadmium, mercury, chromium, selenium, and manganese concentrations were measured in the breast feathers of 25 pairs of franklin's gull (larus pipixcan) and in their eggs from a breeding colony at agassiz national wildlife refuge in northwestern minnesota. metal concentrations in eggs represent metals sequestered in the egg by females at the time of egg formation; while metal concentrations in parents represent concentrations of metals in blood supply at the time of feather formation. there ...	1996	8661517
heavy metal and selenium levels in birds at agassiz national wildlife refuge, minnesota: food chain differences.	the levels of heavy metals and selenium in the eggs and in breast feathers of adult doublecrested cormorant (phalacrocorax auritus), black-crowned night heron (nycticorax nycticorax), and franklin's gull (larus pipixcan) nesting at agassiz national wildlife refuge in marshall county, northwestern minnesota were examined. also examined were metal levels in the feathers of fledgling night herons and gulls, in the feathers of adult and fledgling american bittern (botaurus lentiginosus), in eggs of ...	1996	24193900
heavy metal and selenium levels in birds at agassiz national wildlife refuge, minnesota: food chain differences.	the levels of heavy metals and selenium in the eggs and in breast feathers of adult doublecrested cormorant (phalacrocorax auritus), black-crowned night heron (nycticorax nycticorax), and franklin's gull (larus pipixcan) nesting at agassiz national wildlife refuge in marshall county, northwestern minnesota were examined. also examined were metal levels in the feathers of fledgling night herons and gulls, in the feathers of adult and fledgling american bittern (botaurus lentiginosus), in eggs of ...	1996	24193900
age differences in metals in the blood of herring (larus argentatus) and franklin's (larus pipixcan) gulls.	concentrations of heavy metals and selenium were measured in the blood of adult and young herring (larus argentatus) and franklin's (larus pipixcan) gulls collected during the same breeding season in colonies in the new york bight and in northwestern minnesota, respectively. concentrations were expected to be higher in young herring gulls collected in an urban, industrialized area, compared to young franklin's gulls collected in a relatively pristine prairie marsh. exposure is similar for the fl ...	1997	9419263
heavy metals and selenium in grebe eggs from agassiz national wildlife refuge in northern minnesota.	metal levels in eggs can often be used as an indicator of exposure and of potential effects. in previous work at agassiz national wildlife refuge, northwestern minnesota, the levels of several heavy metals were shown to be significantly higher in the eggs of eared grebes (podiceps nigricollis) compared to those in the eggs of franklin's gulls (larus pipixcan), black-crowned night-herons (nycticorax nycticorax) and double-crested cormorants (phalacrocorax auritus, except for mercury). in the pres ...	2005	16418918
heavy metals and selenium in grebe eggs from agassiz national wildlife refuge in northern minnesota.	metal levels in eggs can often be used as an indicator of exposure and of potential effects. in previous work at agassiz national wildlife refuge, northwestern minnesota, the levels of several heavy metals were shown to be significantly higher in the eggs of eared grebes (podiceps nigricollis) compared to those in the eggs of franklin's gulls (larus pipixcan), black-crowned night-herons (nycticorax nycticorax) and double-crested cormorants (phalacrocorax auritus, except for mercury). in the pres ...	2005	16418918
selenium and metal concentrations in waterbird eggs and chicks at agassiz national wildlife refuge, minnesota.	exceptionally high cadmium (cd) and chromium (cr) concentrations were reported in eggs, feathers, or livers of selected waterbird species nesting at agassiz national wildlife refuge (agassiz) in 1994. ten- to 15-day-old franklin's gull (larus pipixcan), black-crowned night-heron (nycticorax nycticorax), and eared grebe (podiceps nigricollis) chicks were collected in 1998, 1999, and 2001 at agassiz and analyzed for selenium (se) and metals including cd and cr. freshly laid eggs were collected in ...	2007	17464443
selenium and metal concentrations in waterbird eggs and chicks at agassiz national wildlife refuge, minnesota.	exceptionally high cadmium (cd) and chromium (cr) concentrations were reported in eggs, feathers, or livers of selected waterbird species nesting at agassiz national wildlife refuge (agassiz) in 1994. ten- to 15-day-old franklin's gull (larus pipixcan), black-crowned night-heron (nycticorax nycticorax), and eared grebe (podiceps nigricollis) chicks were collected in 1998, 1999, and 2001 at agassiz and analyzed for selenium (se) and metals including cd and cr. freshly laid eggs were collected in ...	2007	17464443
[detection of salmonella and mycobacterium species in seagulls captured in talcahuano, chile].	salmonella can be isolated from the feces of seagulls. therefore these birds can be a vector for dissemination of this pathogen.	2011	22446658
community structure of lice (insecta: phthiraptera) from two sympatric gull species: kelp gull (larus dominicanus) and franklin's gull (larus pipixcan) in talcahuano, chile.	a total of 1,177 lice of four species were collected from 124 kelp gulls (larus dominicanus) and 137 lice of the same four species from 60 franklin's gulls (larus pipixcan). the louse saemundssonia lari (o fabricius) (phthiraptera: philopteridae) was the most numerous on both gull species, with infestation rates of 4.9 on kelp gulls and 1.8 on franklin's gulls. the second most abundant louse was quadraceps punctatus (burmeister), with a high infestation rate but low prevalence on kelp gulls; tho ...	2011	21710024
community structure of lice (insecta: phthiraptera) from two sympatric gull species: kelp gull (larus dominicanus) and franklin's gull (larus pipixcan) in talcahuano, chile.	a total of 1,177 lice of four species were collected from 124 kelp gulls (larus dominicanus) and 137 lice of the same four species from 60 franklin's gulls (larus pipixcan). the louse saemundssonia lari (o fabricius) (phthiraptera: philopteridae) was the most numerous on both gull species, with infestation rates of 4.9 on kelp gulls and 1.8 on franklin's gulls. the second most abundant louse was quadraceps punctatus (burmeister), with a high infestation rate but low prevalence on kelp gulls; tho ...	2011	21710024
evidence for kelp gulls (larus dominicanus) and franklin's gulls (leucophaeus pipixcan) as carriers of salmonella by real-time polymerase chain reaction.	polymerase chain reaction confirmed that two gull species in talcahuano, chile, shed salmonella. fecal samples from resident larus dominicanus had prevalences of 51.2% for salmonella spp. and 26.3% for salmonella enteritidis. prevalences in samples from migratory leucophaeus pipixcan were 75% and 30% respectively. risks to public health may exist.	2012	23060519
characterization and comparison of extended-spectrum β-lactamase (esbl) resistance genotypes and population structure of escherichia coli isolated from franklin's gulls (leucophaeus pipixcan) and humans in chile.	we investigated the general level of antibiotic resistance with further analysis of extended-spectrum beta-lactamase (esbl) prevalence, as well as the population structure of e. coli in fecal flora of humans and franklin's gulls (leucophaeus pipixcan) in central parts of chile. we found a surprisingly high carriage rate of esbl-producing e. coli among the gulls 112/372 (30.1%) as compared to the human population 6/49 (12.2%.) several of the e. coli sequence types (sts) identified in birds have p ...	2013	24098774
comparison of extended-spectrum β-lactamase (esbl) ctx-m genotypes in franklin gulls from canada and chile.	migratory birds have been suggested to contribute to long-distance dispersal of antimicrobial resistant bacteria, but tests of this hypothesis are lacking. in this study we determined resistance profiles and genotypes of esbl-producing bacteria in randomly selected escherichia coli from franklin´s gulls (leucophaeus pipixcan) at breeding sites in canada and compared with similar data from the gulls' wintering grounds in chile. resistant e. coli phenotypes were common, most notably to ampicillin ...	2015	26496629
molecular characterization and genetic diversity of esbl-producing escherichia coli colonizing the migratory franklin's gulls (leucophaeus pipixcan) in antofagasta, north of chile.	the role of wild animals, particularly migratory birds, in the dissemination of antibiotic-resistant bacteria between geographically distant ecosystems is usually underestimated. the aim of this work was to characterize the escherichia coli population from franklin's gull feces, focusing on the extended-spectrum β-lactamase (esbl)-producing strains. in the summer of 2011, 124 fecal swabs from seagulls (1 of each) migrating from the united states and canada to the coast of antofagasta, north of c ...	2015	25313843
the phylogeny and life cycle of two species of profilicollis (acanthocephala: polymorphidae) in marine hosts off the pacific coast of chile.	resolving complex life cycles of parasites is a major goal of parasitological research. the aim of this study was to analyse the life cycle of two species of the genus profilicollis, the taxonomy of which is still unstable and life cycles unclear. we extracted individuals of profilicollis from two species of crustaceans (intermediate hosts) and four species of seagulls (definitive hosts) from sandy-shore and estuarine habitats along the south-east pacific coast of chile. mitochondrial dna analys ...	2016	27667136
timing of breeding determines growth and development in a long-distance migratory bird.	the timing of breeding can have significant consequences for adult and offspring fitness, yet our current hypotheses of seasonal timing focus on the parent perspective. when offspring survival is affected by timing of breeding, we expect to see offspring mechanisms to detect and respond to cues of seasonal timing. avian embryos respond to photoperiod and seasonal cues during development and in this study we evaluate the influence of photoperiod and season on posthatching growth and development i ...	2016	27510648
telomere correlations during early life in a long-lived seabird.	telomere dynamics in blood cells have been linked to aging in a variety of organisms. however, whether blood telomeres are correlated with telomeres in other parts of the body is not well known, especially during early life when telomere loss is expected to be most rapid. we investigated this question in franklin's gulls (leucophaeus pipixcan) by measuring telomere lengths in blood and several other tissues including: heart, liver, and skeletal muscle at the end of embryonic (n=31) and post-nata ...	2016	27633529