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- W2566531567 abstract "Montane habitat is often utilized by migrants in the summertime for reproductive purposes although considerable interannual variation can occur in its availability for occupancy and in the conditions favorable for breeding. For example, variation in snowfall in the Sierra Nevada Mountains of California can cause access to nesting sites for Mountain White-crowned Sparrows Zonotrichia leucophrys oriantha to vary by a month or more, depending upon the depth of the residual snowpack and upon how quickly spring weather causes its depletion. Because breeding is terminated at about the same time each year, this environmentally-induced variation in the onset of nesting can affect the duration of reproductive efforts and, thereby, productivity. There is, in fact, a strong negative relationship between snowpack depth at the end of winter and the numbers of young White-crowns produced in the subsequent summer. Storms can occur at any time during the reproductive period. Some are severe enough to cause egg or nestling mortality and, on occasion, abandonment of the subalpine meadow breeding areas by territory holders for temporary quarters at lower elevations. When nests are lost because of storms, predation, etc., pairs are able to recycle through a truncated but behaviorally complete nesting effort, culminating in oviposition, within 4 to 6 days (unless storms intervene). Despite the vagaries of high altitude weather, the endocrine profiles of Mountain Whitecrowned Sparrows usually resemble those observed in other emberizines at low elevations. Data will be presented on gonadal size and on steroid hormones associated with undisturbed breeding cycles, along with changes that occur during environmental perturbations, such as storms and snowpack-delayed reproduction, in order to provoke questions about how behavioral and endocrine responses are altered in response to high elevation condition." @default.
- W2566531567 created "2017-01-06" @default.
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- W2566531567 date "1994-01-01" @default.
- W2566531567 modified "2023-09-24" @default.
- W2566531567 title "Endocrine and Behavioral Responses in White-crowned Sparrows to High Altitude Conditions" @default.
- W2566531567 hasPublicationYear "1994" @default.
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