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You searched for: Journal Journal of field ornithology Remove constraint Journal: Journal of field ornithology Publication Year 2002 Remove constraint Publication Year: 2002 Source 2002 v.73 no.4 Remove constraint Source: 2002 v.73 no.4
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1. Breeding habitat use by sympatric and allopatric populations of Wilson’s Warblers and Yellow Warblers

Author:
Ruth, Janet M.; Stanley, Thomas R.
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 412-419
ISSN:
0273-8570
Subject:
allopatry; breeding sites; foraging; habitat preferences; habitats; nesting; population dynamics; shrubs; sympatry; Colorado; Rocky Mountain region; Wyoming
Abstract:
... We studied Wilson's Warbler (Wilsonia pusilla) and Yellow Warbler (Dendroica petechia) habitat use in allopatric and sympatric populations in the Rocky Mountains of northern Colorado and southeastern Wyoming in order to better understand the different habitat needs and interactions of these two species. Foraging Wilson's Warblers and Yellow Warblers used very similar habitat, both selecting larger ...
DOI:
10.1648/0273-8570(2002)073[0412:BHUBSA]2.0.CO;2

2. Can observer clothing color affect estimates of richness and abundance? An experiment with point counts

Author:
Riffell, Samuel K.; Riffell, Ben D.
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 351-359
ISSN:
0273-8570
Subject:
avoidance behavior; birds; clothing; color; leaves; nesting; plumage; risk; species diversity; summer; territoriality; winter
Abstract:
... Red-plumaged birds (red species) may behave more visibly in the presence of a red-orange safety vest that field observers must often wear, but species lacking red plumage (non-red species) may behave less visibly (i.e., the species-confidence hypothesis). Such responses may bias many common counting techniques. We experimentally tested if observer clothing color could affect richness and abundance ...
DOI:
10.1648/0273-8570(2002)073[0351:COCCAE]2.0.CO;2

3. Communal breeding and nest defense behavior of the Cayenne Jay (Cyanocorax cayanus)

Author:
Bosque, Carlos; Molina, Cesar
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 360-362
ISSN:
0273-8570
Subject:
Corvidae; antipredatory behavior; breeding; defensive behavior; forests; habitats; nestlings; nests; Venezuela
Abstract:
... Communal breeding has been recorded in a number of New World corvids, mainly among North and Central American jays, but in only one South American species. In this note we present evidence that the Cayenne Jay (Cyanocorax cayanus) is also a communal breeder. Cayenne Jays occur in family-sized groups in forest habitat in southern Venezuela. More than two individuals have access to the nest and feed ...
DOI:
10.1648/0273-8570(2002)073[0360:CBANDB]2.0.CO;2

4. Conspecific density biases passive auditory surveys

Author:
Penteriani, Vincenzo; Gallardo, Max; Cazassus, Hélène
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 387-391
ISSN:
0273-8570
Subject:
Bubo bubo; breeding; males; surveys; vocalization
Abstract:
... Surveys of vocalizing individuals are useful in detecting widely dispersed species that are hard to locate visually. We determined whether conspecific density affects spontaneous vocalizations of territorial Eagle Owls (Bubo bubo) and thus creates a bias in passive auditory surveys. We mainly listened to dusk call displays of 17 males breeding in two areas of high and low density from the beginnin ...
DOI:
10.1648/0273-8570(2002)073[0387:CDBPAS]2.0.CO;2

5. Cowbird/host interactions in a southeastern old-field: a recent contact area?

Author:
Whitehead, Maria A.; Schweitzer, Sara H.; Post, William
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 379-386
ISSN:
0273-8570
Subject:
Molothrus ater; ancestry; coastal plains; eggs; females; gene flow; hatching; hosts; nesting; nests; parasites; parasitism; songbirds; South Carolina
Abstract:
... Although reports of Brown-headed Cowbird (Molothrus ater) parasitism have increased in the Southeast over the past 30 yr, the cowbird's status, distribution, and host relations within this region remain largely unknown. We collected information on cowbird abundance and cowbird/host interactions (parasitism frequency and intensity, hatching success of cowbirds, and host anti-parasite strategies) in ...
DOI:
10.1648/0273-8570(2002)073[0379:CHIIAS]2.0.CO;2

6. Do male Hooded Warblers guard their mates when their paternity is most at risk?

Author:
Fedy, Bradley C.; Norris, D. Ryan; Stutchbury, Bridget J. M.
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 420-426
ISSN:
0273-8570
Subject:
females; males; monogamy; paternity; radio telemetry; risk; vocalization
Abstract:
... Males of socially monogamous species may benefit from using behavioral tactics to ensure their paternity of the young produced by their social mates. We tested whether male Hooded Warblers (Wilsonia citrina) use mate guarding and high song output in an attempt to prevent extra-pair copulations (EPC) by their mates. In this species, most EPC intrusions occur when females produce conspicuous chip vo ...
DOI:
10.1648/0273-8570(2002)073[0420:DMHWGT]2.0.CO;2

7. Nesting success and hatching survival of the Blue-fronted Amazon (Amazona aestiva) in the Pantanal of Mato Grosso do Sul, Brazil

Author:
Fernandes Seixas, Gláucia Helena; Mourão, Guilherme de Miranda
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 399-409
ISSN:
0273-8570
Subject:
Amazona; Arecaceae; Bignoniaceae; Fabaceae; clutch size; deforestation; females; fledglings; floodplains; grasslands; habitats; hatching; nesting; nests; pastures; riparian forests; savannas; shrublands; trees; wet season; Brazil; Pantanal
Abstract:
... We studied the reproductive biology of a population of Blue-fronted Amazons (Amazona aestiva) in the Pantanal of Mato Grosso do Sul State, Brazil, between 1997 and 1999. Nesting occurred from August to December. We monitored 94 nests which were found in trees of different sizes. Nesting trees were distributed in all major vegetation associations (floodplains, grasslands, scrub savanna, savanna, ar ...
DOI:
10.1648/0273-8570(2002)073[0399:NSAHSO]2.0.CO;2

8. Priority research needs for the conservation of Neotropical migrant landbirds : The Partners in Flight Research Working Group

Author:
Donovan, Therese M.; Beardmore, Carol J.; Bonter, David N.; Brawn, Jeffrey D.; Cooper, Robert J.; Fitzgerald, Jane A.; Ford, Robert; Gauthreaux, Sidney A.; George, T. Luke; Hunter, W. C.; Martin, Thomas E.; Price, Jeff; Rosenberg, Kenneth V.; Vickery, Peter D.; Wigley, T. Bently
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 329-339
ISSN:
0273-8570
Subject:
breeding; databases; funding; habitats; landscapes; managers; migratory behavior; prioritization; researchers; scientists; teachers; tropics; winter; United States
Abstract:
... Partners in Flight (PIF) is a consortium of professional and volunteer scientists and educators that promotes the conservation of landbird species. Central to the PIF conservation effort is the development of Bird Conservation Plans specific to each physiographic region of the United States. Without a coordinated prioritization of research needs, land managers, researchers, and funding agencies se ...
DOI:
10.1648/0273-8570(2002)073[0329:PRNFTC]2.0.CO;2

9. Quantifying avian habitat use in forests using track-plates

Author:
Mooney, Kailen A.
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 392-398
ISSN:
0273-8570
Subject:
Pinus; birds; branches; forests; habitat preferences; habitats; trees; Colorado
Abstract:
... I constructed track-plates resembling short pine branches and attached them to pairs of neighboring pine trees distributed over a 1000-ha area in the Colorado Front Range. I checked track-plates after four and eight days between 24–31 August 2000 and scored each for the presence or absence of tracks. Half of all track plates were marked within four days. I found a positive correlation between scor ...
DOI:
10.1648/0273-8570(2002)073[0392:QAHUIF]2.0.CO;2

10. Recommendations for assessing trends in forest bird populations based on the experience of the Ontario Forest Bird Monitoring Program

Author:
Schalk, Gina; Dewar, Heather J.; Cadman, Michael D.
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 340-350
ISSN:
0273-8570
Subject:
birds; forests; monitoring; population density; temporal variation; Ontario
Abstract:
... A main goal of the Forest Bird Monitoring Program (FBMP) is to monitor temporal trends in forest-dwelling bird abundance in Ontario. The program has been running for over a decade. The experience gained from this program can provide methodological recommendations to anyone planning a similar program to monitor trends in bird populations. Power analyses on FBMP data indicated that for species occur ...
DOI:
10.1648/0273-8570(2002)073[0340:RFATIF]2.0.CO;2

11. Red-shouldered Hawk preys on Pied-billed Grebe

Author:
Riehl, Christina
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 410-411
ISSN:
0273-8570
Subject:
Buteo; Podiceps; adults; birds of prey; Louisiana
Abstract:
... An adult Red-shouldered Hawk (Buteo lineatus) was observed capturing and consuming an adult Pied-billed Grebe (Podilymbus podiceps) in Louisiana. Pied-billed Grebes, which regularly dive to escape predators, are rarely captured by raptors. ...
DOI:
10.1648/0273-8570(2002)073[0410:RSHPOP]2.0.CO;2

12. Use and possible functions of large song repertoires by male Eastern Bluebirds

Author:
Huntsman, Bret O.; Ritchison, Gary
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 372-378
ISSN:
0273-8570
Subject:
Sialia sialis; breeding; breeding season; females; fledglings; males; nestlings; Kentucky
Abstract:
... Five male Eastern Bluebirds (Sialia sialis) were observed and songs recorded over entire breeding seasons in central Kentucky. Songs consisted of an average of 3.02 notes and the mean time between the beginning of successive songs within a bout was 7.26 s. Most songs (63.7%) given by male bluebirds were low volume, while 14.8% were moderate volume, and 21.5% were high volume. Individual male blueb ...
DOI:
10.1648/0273-8570(2002)073[0372:UAPFOL]2.0.CO;2

13. Use of fecal analysis to determine seasonal changes in the diet of wintering Harlequin Ducks at a herring spawning site

Author:
Rodway, Michael S.; Cooke, Fred
Source:
Journal of field ornithology 2002 v.73 no.4 pp. 363-371
ISSN:
0273-8570
Subject:
Clupea pallasii pallasii; Crustacea; Polychaeta; biomass; crabs; diet; ducks; eggs; feces; herring; molting; seasonal variation; snails; spawning; spring; stomach; winter
Abstract:
... Few data are available on seasonal changes in winter diet of Harlequin Ducks (Histrionicus histrionicus), especially in relation to their use of Pacific herring (Clupea pallasi) spawn. We used fecal analyses to determine seasonal changes in Harlequin Duck winter diet at a site where Pacific herring spawn. We measured frequency of occurrence and relative abundance by volume of prey remains in 202 f ...
DOI:
10.1648/0273-8570(2002)073[0363:UOFATD]2.0.CO;2