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- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0412:BHUBSA]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0351:COCCAE]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0360:CBANDB]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0387:CDBPAS]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0379:CHIIAS]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0420:DMHWGT]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0399:NSAHSO]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0329:PRNFTC]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0392:QAHUIF]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0340:RFATIF]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0410:RSHPOP]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0372:UAPFOL]2.0.CO;2
- 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
-
http://dx.doi.org/10.1648/0273-8570(2002)073[0363:UOFATD]2.0.CO;2