01 Feb Geographic and Temporal Variation in Annual Survival of a Declining Neotropical Migrant Hummingbird (Selasphorus rufus) Under Varying Fire, Snowpack, and Climatic Conditions
Rufous hummingbirds (Selasphorus rufus) have shown consistent declines in abundance since 1970, with an acceleration in this trend starting in the mid-2000s.Demographic data is needed to isolate possible drivers. We employ mark-recapture
data to calculate sex-specific adult apparent annual survival, accounting for residency
probability, within the coastal and interior regions of British Columbia, Canada between
1998 and 2017. For the coastal region, we also examine associations between apparent
survival and a suite of migratory factors: the amount of recently and historically burned
flyway habitat, fall moisture availability in the alpine (snowpack), and a broad-scale
climate index (SOI), under the assumption that these factors are associated with
food availability during a critical period of the annual cycle.
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