Birds Lost from a Giant Sequoia Forest during Fifty Years

Publication Type:Journal Article
Year of Publication:1988
Authors:Marshall, JT
Journal:The Condor
Volume:90
Issue:2
Date Published:1988
ISBN Number:00105422
Keywords:Aedon, Callipepla, Callipepla pictus, Catharus, Catharus ustulatus, Central America, Ceophoeus, Ceophoeus pileatus, Ciccaba, Ciccaba occidentalis, Contopus, Contopus borealis, Contopus cooperi, Corvidae, Corvus, Corvus corax, Coturnix, Coturnix coturnix, Dryobates villosus, Dryocopus, Dryocopus pileatus, Emberizidae, Glaucidium, Glaucidium californicum, Glaucidium gnoma, Hylatomus, Hylatomus pileatus, Hylocichla, Hylocichla ustulata, Icteridae, Leuconotopicus, Leuconotopicus villosus, Megascops, Megascops flammeolus, Melospiza, Melospiza lincolnii, Molothrus, Molothrus ater, Nannus, Nannus hiemalis, Nannus troglodytes, Nuttallornis cooperi, Odontophoridae, Ophrysia, Ophrysia superciliosa, Oreortyx, Oreortyx picta, Oreortyx pictus, Otus, Otus flammeolus, Phalaenopsis, Phalaenopsis californica, Phalaenopsis gnoma, Phasianidae, Picidae, Picoides, Picoides villosus, Psiloscops, Psiloscops flammeolus, Strigidae, Strix, Strix occidentalis, Troglodytes, Troglodytes aedon, Troglodytes hiemalis, Troglodytes troglodytes, Troglodytidae, Turdidae, Tyrannidae, Zonotrichia, Zonotrichia lincolnii
Abstract:Not all forest bird species breeding on Redwood Mountain, Tulare County, California in the 1930s are still there in the 1980s. Over the 50 years virgin giant sequoia forest of the saddle and east slope (within Kings Canyon National Park) remains unchanged but has lost the Olive-sided Flycatcher (Contopus borealis). The mixture of old and second-growth sequoias of Whitaker's Forest, where pines and undergrowth were removed and snags eliminated, is missing the Mountain Quail (Oreortyx pictus), Flammulated Owl (Otus flammeolus), Northern Pygmy-Owl (Glaucidium gnoma), Spotted Owl (Strix occidentalis), Hairy Woodpecker (Picoides villosus), and Olive-sided Flycatcher. Though unchanged today, the riparian alders of Eshom Creek on the west slope have lost Swainson's Thrush (Catharus ustulatus). Drastic logging by Sequoia National Forest has driven all of the above from the west slope ponderosa pine forest that surrounds Whitaker's Forest. New birds established at Whitaker's Forest by 1986 are the Common Raven (Corvus corax), House Wren (Troglodytes aedon), and Lincoln's Sparrow (Melospiza lincolnii). Intrusion of Brown-headed Cowbirds (Molothrus ater) has begun without yet affecting two abundant species of vireos. The Pileated Woodpecker (Dryocopus pileatus) is reduced; the Winter Wren (Troglodytes troglodytes) has greatly increased. I attempt to explain avifaunal changes by comparing habitats over the 50-year interval. Disappearance of the flycatcher and thrush from unchanged, prime habitat must be caused by destruction of corresponding forests in Central America, where these birds maintain their winter territories.
URL:http://www.jstor.org/stable/1368564
Short Title:The Condor
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith