BIRD POPULATIONS - Birdpop.org

BREEDING BIRD CENSUS: 2008Description of Plot: See Am. Birds 28:699–700 (1974),J. Field Ornithol. 63(Suppl.):79–80 (1992) and66(Suppl.):79–80 (1995). Mature red pines (n=381)were harvested from a 1.2-ha section planted in 1935.Weather: Mean start temp., 18.3°C (range12.2–23.9°C). Coverage: 12.9 h; 9 visits (0 sunrise, 1sunset); 1, 8, 15, 22, 29 June; 13, 20, 27 July; 5 August;2008. Census: Black-throated Green Warbler, 9.0 (22);Blackburnian Warbler, 9.0; Magnolia Warbler, 8.0 (19);Dark-eyed Junco, 7.0 (17); Golden-crowned Kinglet,5.0 (12); Blue-headed Vireo, 4.0 (10); Black-cappedChickadee, 4.0; Hermit Thrush, 4.0; American Robin,4.0; Purple Finch, 4.0; Brown Creeper, 3.0 (7); YellowrumpedWarbler, 3.0; Red-breasted Nuthatch, 2.5;Blue Jay, 2.0; Chestnut-sided Warbler, 2.0; ChippingSparrow, 2.0; Indigo Bunting, 2.0; Brown-headedCowbird, 2.0 (female); Cedar Waxwing, 1.5; RedshoulderedHawk, 1.0; Red-eyed Vireo, 1.0; AmericanCrow, 1.0; Winter Wren, 1.0; Ovenbird, 1.0; MourningWarbler, 1.0; White-throated Sparrow, 1.0; AmericanGoldfinch, 1.0; Song Sparrow, 0.5. Total: 28 species;86.5 territories (208/40 ha). Visitors: Broad-wingedHawk, Red-tailed Hawk, Ruby-throatedHummingbird, Yellow-bellied Sapsucker, HairyWoodpecker, Eastern Wood-Pewee, Great CrestedFlycatcher, Common Raven, Hooded Warbler, CanadaWarbler, Red Crossbill. Remarks: The total number ofterritories (87.5) was slightly above the 34-yearaverage (84.3). There were no new species recordedon the plot. Wood Thrush was missing after beingreported in 30 of the past 34 years; Purple Finch hadthe highest number of territorial males (4) everrecorded. There was considerable disruption in aportion of the plot due to the selective logging activityconducted during the breeding season.Acknowledgments: Appreciation to Rick Walker andDennis Smith for weather data.12. RIPARIAN SCRUBMATORRAL RIBEREÑOJILL COUMOUTSOSanta Ana Watershed AssociationP.O. Box 219Chino CA 91708Location: California; Riverside Co.; Norco; NorcoBurn; 33˚57'29"N, 117˚31'56"W; Corona NorthQuadrangle, USGS. Continuity: Established 2006; 3yr. Size: 14.6 ha. Description of Plot: See BirdPopulations 9:192 (2009). Weather: Mean start temp.,16.1˚C (range 10.2–23.8˚C). Temperatures were mild,as typical for southern California's Mediterraneanclimate. Source: a Kestrel 3000 was used to measuretemperature and wind speed. Coverage: 20.5 h; 8visits (0 sunrise, 0 sunset); 18 March; 7, 21 April; 8, 22May; 10, 23 June; 11 July; 2008. Census: Anna'sHummingbird, 13.0 (36; 4N,6FL); Song Sparrow, 13.0;Spotted Towhee, 10.0 (27); Least Bell's Vireo, 8.5 (23;7N,28FL); Common Yellowthroat, 8.0 (22; 2FL); BlackheadedGrosbeak, 8.0; House Wren, 7.0 (19; 1N);Yellow-breasted Chat, 7.0 (3FL); Mourning Dove, 6.0(16; 2N); Yellow Warbler, 5.0 (14; 2N,3FL); LesserGoldfinch, 5.0; Bewick's Wren, 3.0 (8); CaliforniaTowhee, 3.0 (1FL); House Finch, 3.0; Cooper's Hawk,2.0 (1N,3FL); Bushtit, 2.0; Black-chinnedHummingbird, 1.0; Northern Flicker, 1.0; AshthroatedFlycatcher, 1.0; Western Bluebird, 1.0 (1FL);Nuttall's Woodpecker, 0.5. Total: 21 species; 108.0territories (296/40 ha). Visitors: Mallard, AmericanBittern, Red-tailed Hawk, American Kestrel, CommonGround-Dove, Downy Woodpecker, WillowFlycatcher, Pacific-slope Flycatcher, Black Phoebe,Say’s Phoebe, Western Scrub-Jay, Barn Swallow,Northern Mockingbird, California Thrasher,European Starling, Orange-crowned Warbler, FoxSparrow, Lincoln’s Sparrow, Blue Grosbeak, RedwingedBlackbird, Brown-headed Cowbird, HoodedOriole, Bullock’s Oriole, American Goldfinch.Remarks: Song Sparrows were the most abundantbreeders on the site due to the presence of a denseunderstory. Anna’s Hummingbird was the secondmost abundant species. In addition to winter andbreeding bird surveys, this site is currently beingmonitored for the nests of the endangered Least Bell'sVireo. Other species of concern that bred on the plotincluded Yellow-breasted Chat and Yellow Warbler. ACooper’s Hawk nest was found at the building stageand monitored throughout the season. It wassuccessful and fledged three young. This sitecontinues to be treated for Arundo re-growth on ayearly basis. A Brown-headed Cowbird trap waspresent adjacent to the plot for the entire breedingseason.13. RIPARIAN SCRUB BASINCUENCA CON MATORRAL RIBEREÑOMELODY AIMARSanta Ana Watershed AssociationP.O. Box 219Chino CA 91708Location: California; Riverside Co.; Riverside;Mockingbird Canyon; 33˚53'33"N, 117˚24'47"W;Riverside West Quadrangle, USGS. Continuity:Established 2004; 5 yr. Size: 12.7 ha. Description ofPlot: See Bird Populations 8:142–143 (2007). Weather:Mean start temp., 18.5˚C (range 8–26˚C).Temperatures were mild, as is typical for southernCalifornia's Mediterranean climate. There was noprecipitation within 24 hours of survey visits.Drought conditions continue. Coverage: 19.3 h; 8visits (0 sunrise, 0 sunset); 14, 18, 28 March; 14 April;16, 22 May; 9, 30 June; 2008. Census: Song Sparrow,12.0 (38; 2FL); California Towhee, 11.0 (35; 1FL);[131]