| isolation and characterization of 22 polymorphic microsatellite loci for the barrow's goldeneye (bucephala islandica). | we describe primers and polymerase chain reaction conditions to amplify 22 microsatellite loci from the barrow's goldeneye (bucephala islandica). the primers were tested on 27 individuals from a population breeding in british columbia, canada. the developed primer pairs yielded an average of 6.11 alleles per locus (range 2-12), an average observed heterozygosity of 0.70 (range 0.07-0.96) and a polymorphic information content of 0.07-0.88. | 2009 | 21564750 |
| metals, trace elements, polychlorinated biphenyls, organochlorine pesticides, and brominated flame retardants in tissues of barrow's goldeneyes (bucephala islandica) wintering in the st. lawrence marine ecosystem, eastern canada. | the eastern north american population of barrow's goldeneyes winters in the st. lawrence estuary and gulf of st. lawrence where the sediments and food web are known to be contaminated with inorganic and organic compounds. therefore, there is a potential for contamination of this population, which is designated of special concern by the committee on the status of endangered wildlife in canada. specimens were collected during three consecutive winters (2005-2007) in three regions (manicouagan, cha ... | 2012 | 22875100 |
| spatial variation in polycyclic aromatic hydrocarbon exposure in barrow's goldeneye (bucephala islandica) in coastal british columbia. | barrow's goldeneyes are sea ducks that winter throughout coastal british columbia (bc). their diet consists primarily of intertidal blue mussels, which can accumulate pahs; accordingly, goldeneyes may be susceptible to exposure through contaminated prey. in 2014/15, we examined total pah concentrations in mussels from undeveloped and developed coastal areas of bc. at those same sites, we used erod to measure hepatic cyp1a induction in goldeneyes. we found higher mussel pah concentrations at deve ... | 2017 | 28238486 |
| the body size-dependent diet composition of north american sea ducks in winter. | daily food requirements scale with body mass and activity in animals. while small species of birds have higher mass-specific field metabolic rates than larger species, larger species have higher absolute energy costs. under energy balance, we thus expect the small species to have a higher energy value diet. also the weight and time constraints for flighted and diurnal foragers should set a maximum to the amount of prey items taken in one meal and to the daily number of meals, respectively. furth ... | 2013 | 23755266 |
| Differential responses to related hosts by nesting and non-nesting parasites in a brood-parasitic duck. | Host-parasite relatedness may facilitate the evolution of conspecific brood parasitism, but empirical support for this contention remains inconclusive. One reason for this disparity may relate to the diversity of parasitic tactics, a key distinguishing feature being whether the parasite has a nest of her own. Previous work suggests that parasites without nests of their own may be of inferior phenotypic quality, but because of difficulties in identifying these parasitic individuals, little is kno ... | 2011 | 21923774 |
| relatedness and spatial proximity as determinants of host-parasite interactions in the brood parasitic barrow's goldeneye (bucephala islandica). | recent studies, which have found evidence for kin-biased egg donation, have sparked interest in re-assessing the parasitic nature of conspecific brood parasitism (cbp). since host-parasite kinship is essential for mutual benefits to arise from cbp, we explored the role of relatedness in determining the behaviour of conspecific nest parasites and their hosts in nesting female barrow's goldeneyes (bucephala islandica), a duck in which cbp is common. the results revealed that the amount of parasiti ... | 2009 | 19457174 |
| cooperation, conflict, and crèching behavior in goldeneye ducks. | crèching behavior, or brood amalgamation, results in offspring being reared by adults other than their genetic parents. although a variety of hypotheses have been proposed to explain this behavior, most assume either that brood amalgamation is accidental (i.e., nonselected) or that adoption of young is selected for because of social benefits to the young and/or adopting parents. we propose, instead, that brood amalgamation is a function of two separate processes: brood desertion and brood adopti ... | 1998 | 18811315 |
| a blood survey of elements, viral antibodies, and hemoparasites in wintering harlequin ducks (histrionicus histrionicus) and barrow's goldeneyes (bucephala islandica). | twenty-eight harlequin ducks (histrionicus histrionicus) and 26 barrow's goldeneyes (bucephala islandica) were captured in prince william sound, alaska, between 1 and 15 march 2005. blood was collected for quantification of element concentrations, prevalence of antibodies to several viruses, and hemoparasite prevalence and identification. although we found selenium concentrations that have been associated with selenosis in some birds (>or=2.0 ppm ww), our findings contribute to a growing literat ... | 2008 | 18436685 |
| redistribution of extracellular water and sodium may contribute to saline tolerance in wild ducks. | the compartmentalization of body fluids was measured in three species of ducks that differ in saline tolerance. half of the birds of each species drank freshwater, while the other half drank saline (300 mm nacl). among ducks that drank freshwater, total body water (tbw) was similar among all species, but barrow's goldeneyes (bucephala islandica), the most marine species, had larger extracellular fluid volume (ecfv) than freshwater mallards (anas platyrhynchos) or estuarine canvasbacks (aythya va ... | 2005 | 15887091 |
| comparison of renal and salt gland function in three species of wild ducks. | three processes central to osmoregulation of marine birds were compared in three species of ducks that differ in habitat affinity, diet and saline tolerance. these processes are filtration of na+ and water from the plasma by the kidneys, their reabsorption along the renal tubules, and secretion by the salt glands. barrow's goldeneyes bucephala islandica, the most marine species, have the highest rates for all three processes and only this species can secrete all the infused salt via the salt gla ... | 2003 | 12909708 |
| profilicollis botulus (van cleave, 1916) from diving ducks and shore crabs of british columbia. | adults of profilicollis botulus were found in 6 species of diving ducks in british columbia including 3 new hosts: common goldeneye, bucephala clangula (l.); barrow's goldeneye, b. islandica (gmelin); and greater scaup, aythya marila (l.). the identification of the species was verified by the examination of co-types and specimens from eider ducks, somateria mollissima (l.), from scotland and oldsquaw, clangula hyemalis (l.), from new brunswick. cystacanths from the hairy shore crab, hemigrapsus ... | 1989 | 2918442 |
| heavy metals in seaducks and mussels from misty fjords national monument in southeast alaska. | quartz hill, in misty fjords national monument near ketchikan, alaska, is the site of a proposed molybdenum-producing mine. to provide baseline data for use in post-development comparisons, we analyzed tissues of barrow's goldeneyes (bucephala islandica), common mergansers (mergus merganser), and blue mussels (mytilus edulis) for seven heavy metals that could potentially be released into the environment as a result of mining operations. specimens were collected in 1980, 1981, and 1982 from two f ... | 1995 | 24197728 |
| cytochrome p4501a biomarker indication of the timeline of chronic exposure of barrow's goldeneyes to residual exxon valdez oil. | we examined hepatic erod activity, as an indicator of cyp1a induction, in barrow's goldeneyes captured in areas oiled during the 1989 exxon valdez spill and those from nearby unoiled areas. we found that average erod activity differed between areas during 2005, although the magnitude of the difference was reduced relative to a previous study from 1996/1997, and we found that areas did not differ by 2009. similarly, we found that the proportion of individuals captured from oiled areas with elevat ... | 2011 | 21131011 |
| density dependence, frequency dependence, and alternative nesting strategies in goldeneyes. | we develop a simple model to explore the conditions under which intraspecific brood parasitism would be evolutionarily stable in a cavity-nesting bird, the barrow's goldeneye. our results show that parasitism can be maintained by negative frequency-dependent selection, which is consistent with recent speculations. however, when we include the effects of density dependence, we find a density threshold below which frequency-dependent effects on fitness are negligible but above which frequency depe ... | 1992 | 19426035 |