| significance of a basal melanin layer to production of non-iridescent structural plumage color: evidence from an amelanotic steller's jay (cyanocitta stelleri). | non-iridescent structural plumage color is typically produced by coherent scattering of light within a matrix of keratin and air (a ;spongy layer') in feather barbs. it remains unclear what role, if any, the basal melanin layer underlying this spongy layer plays in the production of coloration. amelanism in birds with structural color is a ;natural experiment' in which melanin pigmentation is lost, allowing us to identify the effects of the loss of melanin on structural color production. here we ... | 2006 | 16547296 |
| mites of the genus torotrogla (prostigmata: syringophilidae) from north american passerines. | five new quill mite species of the genus torotrogla kethley, 1970 (acari: syringophilidae) are described from north american passerines: t. aphelocoma sp.n. from aphelocoma californica (corvidae) and t. cardinalis sp.n. from cardinalis cardinalis (cardinalidae) in texas; and t. coccothraustes sp.n. from coccothraustes vespertinus (fringillidae), t. cyanocitta sp.n. from cyanocitta stelleri (corvidae), and t. piranga sp.n. from piranga ludoviciana (thraupidae) in california. a key to females of a ... | 2009 | 19351069 |
| quantifying the multi-scale response of avifauna to prescribed fire experiments in the southwest united states. | landscape-scale disturbance events, including ecological restoration and fuel reduction activities, can modify habitat and affect relationships between species and their environment. to reduce the risk of uncharacteristic stand-replacing fires in the southwestern united states, land managers are implementing restoration and fuels treatments (e.g., mechanical thinning, prescribed fire) in progressively larger stands of dry, lower elevation ponderosa pine (pinus ponderosa) forest. we used a before ... | 2009 | 19425425 |
| serosurvey for west nile virus antibodies in steller's jays ( cyanocitta stelleri ) captured in coastal california. | west nile virus (wnv) was first detected in new york in 1999 and, during its expansion across the continental us, southern canada, and mexico, members of the corvidae (ravens, crows, magpies, and jays) were frequently infected and highly susceptible to the virus. as part of a behavioral study of steller's jays ( cyanocitta stelleri ) conducted from 2011-2014 in the coastal california counties of san mateo and santa cruz, 380 steller's jays were captured and tested for antibodies to wnv. using th ... | 2017 | 28192043 |
| marbled murrelet nest predation risk in managed forest landscapes: dynamic fragmentation effects at multiple scales. | the effects of forest fragmentation on bird populations have been studied primarily as static phenomena. yet when forests are allowed to regenerate, local edge contrast and landscape matrix composition change with time, and we would expect fragmentation effects to change accordingly. describing this process is critical for the conservation of avian species sensitive to forest fragmentation, including the marbled murrelet (brachyramphus marmoratus), a seabird threatened by ongoing harvest of old- ... | 2009 | 19688934 |
| new harpirhynchinae dubinin (acariformes: harpirhynchidae)--intracutaneous and feather-base parasites of birds. | seven new species of intracutaneous parasites of the subfamily harpirhynchinae dubinin (acariformes: cheyletoidea: harpirhynchidae) are described: anharpyrhynchus elizae sp. nov. from cyanocitta cristata (type host), cyanocitta stelleri (passeriformes: corvidae), and colaptes auratus (piciformes: picidae) from the usa; anharpyrhynchus apodus sp. nov. from lichmera indistincta (type host) and phylidonyris novaehollandiae (passeriformes: meliphagidae) from australia; anharpyrhynchus lukoschusi sp. ... | 2014 | 25283209 |
| genetic sequence data reveals widespread sharing of leucocytozoon lineages in corvids. | leucocytozoon, a widespread hemosporidian blood parasite that infects a broad group of avian families, has been studied in corvids (family: corvidae) for over a century. current taxonomic classification indicates that leucocytozoon sakharoffi infects crows and related corvus spp., while leucocytozoon berestneffi infects magpies (pica spp.) and blue jays (cyanocitta sp.). this intrafamily host specificity was based on the experimental transmissibility of the parasites, as well as slight differenc ... | 2016 | 27189064 |
| rapid divergence and postglacial colonization in western north american steller's jays (cyanocitta stelleri). | post-pleistocene avian colonization of deglaciated north america occurred from multiple refugia, including a coastal refugium in the northwest. the location of a pacific coastal refugium is controversial; however, multiple lines of evidence suggest that it was located near the queen charlotte islands (also known as haida gwaii). the queen charlotte islands contain a disproportionately large number of endemic plants and animals including the steller's jay cyanocitta stelleri carlottae. using five ... | 2005 | 16202093 |
| british columbia. aspergillosis outbreak in stellar's jays (cyanocitta stelleri) from central vancouver island. | | 1993 | 17424208 |
| the genus brueelia (phthiraptera: ischnocera: philopteridae) of north american jays and allies (aves: passeriformes: corvidae), with descriptions of five new species. | five new species of chewing lice in the genus brueelia kéler, 1936 , are described from north american jays and allies. they are brueelia mexicana n. sp. from aphelocoma woodhouseii cyanotis ridgway, 1887 ; brueelia bonnevillensis n. sp. from aphelocoma woodhouseii nevadae pitelka, 1945 ; brueelia diblasiae n. sp. from cyanocitta stelleri frontalis ( ridgway, 1873 ); brueelia tempestwilliamsae n. sp. from gymnorhinus cyanocephala wied-neuwied, 1841 ; brueelia mcnewae n. sp. from nucifraga columb ... | 2019 | 31805246 |
| predator-prey interactions in the canopy. | small mammal abundances are frequently limited by resource availability, but predators can exert strong lethal (mortality) and nonlethal (e.g., nest abandonment) limitations. artificially increasing resource availability for uncommon small mammals provides a unique opportunity to examine predator-prey interactions. we used remote cameras to monitor 168 nest platforms placed in the live tree canopy (n = 23 young forest stands), primarily for arboreal red tree voles (tree voles; arborimus longicau ... | 2020 | 32884644 |
| bio-inspired bright structurally colored colloidal amorphous array enhanced by controlling thickness and black background. | inspired by steller's jay, which displays angle-independent structural colors, angle-independent structurally colored materials are created, which are composed of amorphous arrays of submicrometer-sized fine spherical silica colloidal particles. when the colloidal amorphous arrays are thick, they do not appear colorful but almost white. however, the saturation of the structural color can be increased by (i) appropriately controlling the thickness of the array and (ii) placing the black backgroun ... | 2017 | 28447768 |
| behavioral mechanisms leading to improved fitness in a subsidized predator. | general mechanisms underlying the distribution and fitness of synanthropic predators in human-influenced landscapes remain unclear. under the consumer resource-matching hypothesis, synanthropes are expected to distribute themselves among habitats according to resource availability, such that densities are greater in human-subsidized habitats, but mean individual fitness is equal among habitats because of negative density dependence. however, "under-matching" to human food resources can occur, be ... | 2017 | 28689262 |
| who's watching influences caching effort in wild steller's jays (cyanocitta stelleri). | steller's jays (cyanocitta stelleri) often store food and return to retrieve the stored items at a later time. between caching and consumption, stored food has the potential to be pilfered by conspecific observers. we investigated whether individually marked steller's jays in suburban neighborhoods of arcata, california, usa, adjusted cache concealment effort when in the presence of conspecifics. both male and female jays traveled the shortest distances to cache when alone, traveled further when ... | 2015 | 25001401 |
| steller sex: infidelity and sexual selection in a social corvid (cyanocitta stelleri). | genetic analysis of avian mating systems has revealed that more than 70% of monogamous species show incidence of offspring parentage that does not match the social partner. extra-pair parentage (epp) has been linked to a variety of factors, including size and symmetry of ornamental traits, coloration, resource availability, and local conspecific density. we examined how ornamental plumage traits of individual steller's jays (cyanocitta stelleri) and territory characteristics influence genetic fi ... | 2014 | 25148039 |