Behavioural profile predicts dominance status in mountain chickadees, Poecile gambeli
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منابع مشابه
Pitch-related cues in the songs of sympatric mountain and black-capped chickadees.
Acoustic frequency (pitch) cues are known to be important in the recognition of conspecific song in a number of songbird species. Mountain chickadees (Poecile gambeli) and black-capped chickadees (Poecile atricapillus) are sympatric over parts of their ranges and their species-typical songs share many features. I examined the acoustic characteristics of song of these two congeners in a region o...
متن کاملThe relationship between dominance, corticosterone, memory, and food caching in mountain chickadees (Poecile gambeli).
It has been hypothesized that in avian social groups subordinate individuals should maintain more energy reserves than dominants, as an insurance against increased perceived risk of starvation. Subordinates might also have elevated baseline corticosterone levels because corticosterone is known to facilitate fattening in birds. Recent experiments showed that moderately elevated corticosterone le...
متن کاملElevation-related differences in memory and the hippocampus in mountain chickadees, Poecile gambeli
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متن کاملThe effect of photoperiod on adrenocortical stress response in mountain chickadees (Poecile gambeli).
Birds respond to environmental changes by modulating their levels of plasma corticosterone, a stress hormone produced by the adrenal glands. Baseline levels of corticosterone and the magnitude of adrenocortical response to acute stress are known to vary seasonally. Photoperiod is one of several potential factors which could affect the seasonal modulation of corticosterone secretion. In this stu...
متن کاملNocturnal Hypothermia in Seasonally Acclimatized Mountain Chickadees and Juniper Titmice
We measured body temperature of Mountain Chickadees (Poecile gambeli) and Juniper Titmice (Baeolophus ridgwayi) at different times of day and under a range of ambient temperatures in order to determine the use of nocturnal hypothermia in seasonally acclimatized small passerines. Our findings show both species used nocturnal hypothermia year-round. Depth of hypothermia was inversely correlated t...
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تاریخ انتشار 2009