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Results 201 - 250 of 1043
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Smith, Susan - - 2011
We investigated long-term trends in mean autumn capture dates of 19 species of migratory passerines including 11 long-distance migrants and eight short-distance migrants. Birds were captured between 1960 and 2007 at a banding station in southern Rhode Island. We detected annual trends in the highest ranked models with mean capture ...
Kirchman, Jeremy - - 2011
We conducted mist-net surveys of migrating songbirds during fall migration 2007 2009 on the 1,300-ha Albany Pine Bush Preserve (APBP), a fire-managed inland pitch pine-scrub oak (Pinus rigida-Quercus spp.) barren in east-central New York. We banded 244 migrating passerines from 32 non-resident species in 8,610 net/m/hr documenting use of northeastern ...
Ewert, David - - 2011
The distribution of landbirds during migration in forested landscapes of eastern North America is poorly known. We describe (1) the distribution of landbirds in northern white cedar (Thuja occidentalis) dominated forests as a function of distance from northern Lake Huron in Michigan during spring and autumn migration, and (2) discuss ...
Beckett, Sean - - 2011
We used information compiled by the U.S. Geological Survey's Bird Banding Laboratory and geographic information systems (GIS) analysis to identify trends in annual Northern Saw-whet Owl (Aegolius acadicus) movement across eastern North America. Analysis of 81,584 Northern Saw-whet Owl banding events revealed a southbound annual fall migration front with peak ...
Adler, Jennifer - - 2011
We examined the provisioning behavior of male and female Grasshopper Sparrows (Ammodramus savannarum) during 2002 and 2003 by videotaping nests (n = 15) and subsequently reviewing tapes to quantify provisioning rates and identify prey items. There was no difference in provisioning rates of male and female Grasshopper Sparrows (P = ...
Ball, Jeffrey - - 2011
We studied Swainson's Thrush (Catharus ustulatus) at two study areas of different latitudes to examine if parents provisioned their nestlings beyond daylight hours. We viewed 591 hrs of video from 37 nests. All nests were provisioned outside the dawn to dusk period but provisioning also continued through the night at ...
Lindell, Catherine - - 2011
We monitored nesting attempts of White-throated (Turdus assimilis) and Clay-colored thrushes (T. grayi) over 4 years in southern Costa Rica to compare nest success in recently abandoned coffee (Coffea spp.) plantations, pasture, and along roads. Daily mortality rates of Clay-colored Thrush nests were lower in pasture (0.054 [+ or -] ...
Zhou, Daqing - - 2011
We identified microhabitat features affecting nest-site selection and examined nest-site characteristics associated with success for the Grey-backed Thrush (Turdus hortulorum) in the Dagang Forestry Farm, Jilin Province, northeast China. We collected data from 79 nests from April to August 2008. Twenty-nine nests (36.7%) were successful, 47 (59.5%) failed due to ...
Minias, Piotr - - 2011
Egg and clutch size of Whiskered Terns (Chlidonias hybrida) in relation to their location within the colony were investigated at Jeziorsko Reservoir, central Poland. All nests (n = 125) in the colony were individually marked and mapped using a Global Positioning System. Four nest clusters were distinguished within the colony ...
Deng, Qiu-xiang - - 2011
Conspecific brood parasitism (CBP) is a widespread alternative female reproductive tactic in birds. We monitored CBP and nesting biology of Mandarin Ducks (Aix galericulata) using nest boxes for six breeding seasons in Zuojia, northeast China. CBP occurred commonly (46.2% of completed clutches) during the study and frequency was positively associated ...
Houston, C. - - 2011
We used Global Positioning System (GPS) satellite transmitters to estimate the breeding home ranges of Turkey Vultures (Cathartes aura) in Saskatchewan, Canada from 2005 to 2009. Breeding ranges calculated using 95% Minimum Convex Polygons (MCP) ranged from 47 to 953 [km.sup.2] and averaged ([+ or -] SD) 371 [+ or ...
Pieplow, Nathan - - 2011
We compared 13 song features among three populations of Yellow-eyed Junco (Junco phaeonotus): J. p. bairdi from Baja California Sur, Mexico; J. p. palliatus from southeast Arizona, USA; and J. p. phaeonotus from Oaxaca, Mexico. Songs of J. p. bairdi differed significantly from those of J. p. palliatus in 11 ...
Collar, Nigel - - 2011
Many authors do not recognize the highland Andean Ibis (Theristicus branickii) as a species distinct from lowland Black-faced Ibis (T. melanopis). We considered this problem using a new system of quantitative criteria for species recognition. Andean Ibis differs from Black-faced Ibis markedly in proportions (shorter bill: mean 118 vs. 140 ...
Hennessey, A. - - 2011
The Swallow-tailed Cotinga (Phibalura flavirostris) has traditionally been considered to consist of two subspecies, P. f. flavirostris of southeastern Brazil's foothill forest and, isolated by ~2,500 km, a population of P. f. boliviana in central-western Bolivia. The plumage of the two taxa is distinctly different; boliviana males have a longer ...
Miranda, Hector C., - - 2011
We constructed a phylogenetic hypothesis of the pattern of colonization of Philippine scops owls (Otus and Mimizuku). Two mitochondrial genes, ND2 and cytochrome b, were sequenced for 12 samples representing six Philippine endemic taxa: three endemic species, one of which has three endemic subspecies; and one endemic genus. Topology, branch ...
Rheindt, Frank - - 2011
Leapfrog patterns are a peculiar and little-understood phenomenon in which similar populations at either end of a geographic continuum are divided by dissimilar intervening populations. Leapfrog patterns may be important in allopatric speciation. Most documented cases of biological leapfrog patterns refer to morphological traits in passerine birds, and only few ...
- - 2011
Perlman, Yoav - - 2011
Price, Trevor - - 2011
Clark, William - - 2011
Mauricio, Giovanni - - 2011
Over 250 bird species have been listed as victims of the Shiny Cowbird (Molothrus bonariensis), a well-known obligate brood parasite. Five of the nine species of Phacellodomus (thornbirds) have been listed as victims, but none has been reported rearing cowbird fledglings. I report observations of a pair of Orange-breasted Thornbirds ...
van Els, - - 2011
Botteri's Sparrow (Peucaea botterii) occurs widely in the shrub-grasslands of southern North America. We report a breeding population of the species in the Sierra de la Encantada of northern Coahuila, Mexico, ~80 km from the Big Bend area of Texas and >300 km from the nearest previously known breeding range ...
Stauffer, K. - - 2011
We describe the first known instance of Black-billed Magpies (Pica hudsonia) nesting in a fully enclosed, pre-formed cavity. Magpies built an undomed nest of sticks in a nest box designed for Wood Ducks (Aix sponsa) near Olds, Alberta, Canada, in 2008. All nesting material was removed from the box after ...
Hendricks, Paul - - 2011
We observed three Common Ravens (Corvus corax) hunting for live sand crabs (Emerita analoga) during low tide on Netarts Spit, Oregon in mid-August 2010. One raven successfully extracted four crabs in five attempts during a 5-min period. The ravens hunted on a large sandy beach near the upper margin of ...
Lenz, Bryan - - 2011
We describe the successful predation of a black-bearded saki monkey (Chiropotes satanas chiropotes) by a Harpy Eagle (Harpia harpyja) in the Brazilian Amazon and briefly recap two past Harpy Eagle-primate predation interactions. The physiological limitations that raptor anatomy places on individuals during predation attempts are considered along with escape behaviors ...
Boves, Than - - 2011
Conspecific egg destruction is an adaptive behavior that has typically evolved in multibrooded, polygynous, or colonial avian species, and can be difficult to observe. We describe the first case of egg destruction in the Parulidae, which consists of mostly single-brooded and socially monogamous species. In this case, a female Cerulean ...
Underwood, Todd - - 2011
We videotaped nine ejections of real (n = 5) and artificial (n = 4) Brown-headed Cowbird (Molothrus ater) eggs by Warbling Vireos (Vireo gilvus). All eggs were ejected within 6 min. There were no significant differences in time used for any ejection behavior by egg type, although artificial eggs were ...
LaPergola, Joshua - - 2011
Few descriptions exist of the nesting behavior of the Gray Trembler (Cinclocerthia gutturalis), and the only nest description of this species seems incongruent with what is known about nesting behavior of other species of Mimidae. We report the first definitively described nest of the Gray Trembler in St. Lucia, West ...
Robinson, Orin - - 2011
We investigated factors that affect nest-site selection, egg success, and hatching success of Brown Pelicans (Pelecanus occidentalis) on Gaillard Island, Alabama, USA, a man-made island in Mobile Bay. Vegetation density at differing heights, and temporal and spatial variables were considered in the analysis. Brown Pelicans arriving earliest chose sites that ...
Youngman, Joseph - - 2011
A stand-replacing fire in 404 ha of jack pine (Pinus banksiana) anal mixed pine forest in Michigan's Upper Peninsula in 2007 resulted in Blackbacked Woodpeckers (Picoides arcticus) nesting at high density in 2008, the second possible nesting season postfire. Nests were found within a 93-ha study area and a 19ha ...
Holroyd, Geoffrey - - 2011
We document a female Burrowing Owl (Athene cunicularia) that nested in Arizona and dispersed 1,860 km to Saskatchewan, where she successfully raised seven young during the same breeding season. The dispersal path between these two locations has not been documented previously. This is the longest distance ever recorded for breeding ...
Weidensaul, C. - - 2011
Use of ultraviolet (UV) light, which causes porphyrin pigments in feathers of some birds to fluoresce, provides a simple, effective means of distinguishing multiple generations of flight feathers in owls. This permits easier and more accurate classification of age of adult owls. This lighting technique has been used extensively with ...
Townsend, Jason - - 2011
We investigated sex and age ratios of wintering Bicknell's Thrush (Catharus bicknelli) across a geographic gradient of sites on Hispaniola. The island-wide proportion male was 0.64 (n = 127), which is comparable to the known male bias in breeding areas. The proportion male varied geographically on Hispaniola, suggesting some level ...
O'Brien, Erin - - 2011
Populations of Loggerhead Shrikes (Lanius ludovicianus) across North America have been declining, and factors responsible for this decline remain unclear. Few studies have focused on the availability and use of wintering habitat. Our objectives were to ascertain the size and characteristics of Loggerhead Shrike territories, and examine the huntingeel behavior ...
Chen, Chao-Chieh - - 2011
Search behavior of arboreal insectivorous migrants was studied at three stopover sites along the northern coast of the Gulf of Mexico during spring migrations, 1993-1995. We examined if search behavior was affected by phylogeny, or by environmental factors. A sequence of search movements (hop, flutter, or flight) in a foraging ...
Janes, Stewart - - 2011
We studied songs of Black-throated Gray Warblers (Dendroica nigrescens) in a fragmented landscape in southwestern Oregon and northern California where each male sings a single Type I song consisting of two phrases. Fourteen variants of Type I songs were distributed in a complex geographic pattern across 19,400 [km.sup.2] of the ...
Behney, Adam - - 2011
We examined behavioral interactions of raptors, Chihuahuan Ravens (Corvus cryptoleucus), and Lesser Prairie-Chickens (Tympanuchus pallidicinctus) at leks in the Texas Southern High Plains. Northern Harriers (Circus cyaneus) and Swainson's Hawks (Buteo swainsoni) were the most common raptors observed at leks. Only 15 of 61 (25%) raptor encounters at leks (0.09/hr) ...
Denes, Francisco - - 2011
The White-collared Kite (Leptodon forbesi Swann, 1922), previously known by the holotype and three specimens from northeastern Brazil from the late 1980s, is considered by many as a juvenile variant of the Grey-headed Kite (L. cayanensis Latham, 1790). We present new morphological evidence from museum specimens of both species, including ...
Walsh, Jennifer - - 2011
Hybridization between Saltmarsh Sparrow (Ammodramus caudacutus) and Nelson's Sparrow (A. nelsoni) has been documented in areas where the two species occur sympatrically, increasing the difficulty of accurate species identification. We developed a DNA barcoding restriction fragment length polymorphism (RFLP) test to discriminate between Nelson's Sparrows and Saltmarsh Sparrows and applied ...
Harvey, Michael - - 2011
Field surveys conducted between 4 September and 17 November 2008 resulted in the first comprehensive inventory of the avifauna of the outlying highlands of the Gran Pajonal and southern Cerros del Sira in central Peru. We report 462 bird species representing 52 families from above 900 m elevation. We describe ...
Lee, Jong - - 2011
We recorded parental provisioning rates of Varied Tits (Poecile various) at different altitudes (n = 17, 7, and 11 nest boxes at 300, 900, and 1,400 m, respectively) to examine if males and females cooperate in response to increased provisioning pressure due to nutritional demands of nestlings. Females provisioned nestlings ...
Fraga, Rosendo - - 2011
Host-parasite interactions between Red-rumped Caciques (Caeicus haemorrhous) and Giant Cowbirds (Molothrus oryzivorus) were studied at 52 nests in the Atlantic Forest, Misiones, Argentina. Cowbird eggs (1-6) occurred in 27 of 38 cacique nests (71%) found during the egg stage. Giant Cowbird eggs were white and unmarked (85%), or marked and ...
Reiter, Matthew - - 2011
We examined factors influencing Canada Goose (Branta canadensis interior) annual nest success, including the relative abundance of collared lemmings (Dicrostonyx richardsoni), arctic fox (Alopex lagopus) den occupancy, nest density, and spring phenology using data collected during annual Canada Goose breeding area surveys at Cape Churchill, Manitoba. Nest density and arctic ...
Duca, Charles - - 2011
The Shrike-like Tanager (Neothraupisfasciata) is a Cerrado bird considered as near threatened. Its life history is poorly known, especially its reproduction. We monitored reproduction during four breeding seasons (2003- 2006) with 120 nests in a protected area in central Brazil. Nesting began at the end of the dry season and ...
del Rosario Avalos, - - 2011
I studied the breeding biology, parental care, and nesting success of the Bolivian Swallow-tailed Cotinga (Phibalura flavirostris boliviana) in Aten, northwestern Bolivia, from October 2005 to February 2006. The incubation period ranged from 17 to 19 days and the nestling period was 25 to 30 days. Swallow-tailed Cotingas appeared to ...
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