Degree of Threat: B : Moderately threatened throughout its range, communities provide natural resources that when exploited alter the composition and structure of the community over the long-term, but are apparently recoverable
Comments: Logging of older trees and hollow snags eliminates nest and roost habitat. "Forest health" management activities that reduce incidence of heartrot and aerial insects would also reduce potential habitat and prey. Factors that reduce abundance of Pileated Woodpeckers may in turn reduce cavity availability and impact swifts. Logging reduced old-growth habitats in the Pacific Northwest (Bull and Beckwith 1993). In California, where the species occurs in greatest abundance in coastal redwood forests, less than 10% of the original old-growth redwood forests remain (Sterling and Paton 1996). To a much lesser extent, swifts may be losing nesting possibilities where brick chimneys are replaced with insulated pipe or covered with screen spark-arresters (Bull and Collins 1993). Large migratory roosts in chimneys may be lost when chimneys are covered or replaced, or birds may even be killed by inadvertent use of the chimneys' furnaces, etc. (Eshbaugh 2000). Activities such as pesticide spraying that impact aerial insects could decrease food availability, but no data available.
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