Fox Sparrow (Passerella iliaca)

2002 ◽  
Author(s):  
Jason D. Weckstein ◽  
Donald E. Kroodsma ◽  
Robert C. Faucett
Keyword(s):  
Passerella Iliaca

scholarly journals Male territorial aggression and androgen modulation in high latitude populations of the Sooty, Passerella iliaca sinuosa, and Red Fox Sparrow, Passerella iliaca zaboria

2009 ◽  
Vol 151 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Douglas W. Wacker ◽  
Alexander J. Coverdill ◽  
Carolyn M. Bauer ◽  
John C. Wingfield
Keyword(s):  
High Latitude ◽  
Red Fox ◽  
Territorial Aggression ◽  
Passerella Iliaca

Reactions of Four Passerine Species To Threats of Predation and Cowbird Parasitism: Enemy Recognition or Generalized Responses?

Behaviour ◽  
1992 ◽  
Vol 123 (1-2) ◽  
pp. 84-105 ◽  
Author(s):  
Spencer G. Sealy ◽  
Diane L. Neudorf
Keyword(s):  
Host Species ◽  
Molothrus Ater ◽  
Egg Laying ◽  
Agelaius Phoeniceus ◽  
Bombycilla Cedrorum ◽  
Cowbird Parasitism ◽  
Dumetella Carolinensis ◽  
Passerella Iliaca ◽  
Enemy Recognition ◽  
Defensive Behaviours

AbstractFour host species of the parasitic brown-headed cowbird (Molothrus ater) were exposed to taxidermic mounts of a female cowbird, fox sparrow (Passerella iliaca), and common grackle (Quiscalus quiscula) at their nests during their egg-laying or nestling stage. Red-winged blackbirds (Agelaius phoeniceus), a species that accepts cowbird eggs laid in their nests, responded more aggressively to cowbird models early in their nesting cycle, indicating that they recognized the unique threat the cowbird posed. Gray catbirds (Dumetella carolinensis), northern orioles (Icterus galbula), and cedar waxwings (Bombycilla cedrorum) can remove cowbird eggs from their nests and for the most part they responded similarly to cowbird models and the "nonthreatening control," i.e. a fox sparrow. Cedar waxwings were nonaggressive to all the models and may rely on concealment to protect their nests from enemies. Removal of cowbird eggs by puncture ejection is more risky than grasp ejection. Despite this, orioles and waxwings (puncture ejectors) were not significantly more aggressive to cowbird models at egg laying than catbirds (grasp ejectors). Responses of the three rejector species toward the cowbird model did not change over the nesting cycle, indicating further that they do not recognize cowbirds as a unique threat. Rejector species may not recognize cowbirds because they have little experience with them. With the exception of waxwings, all of the hosts recognized the grackle as an enemy and increased their levels of defence from the laying to nestling stages. Three of the host-species did not simply respond in a generalized manner to any intruder at their nests but indeed recognized specific enemies. Considerable interspecific variability exists amongst the four species in defensive behaviours, which may reflect their different nesting habitats.

scholarly journals The recent expansion of Fox Sparrow (Passerella iliaca iliaca) breeding range into the northeastern United States

2018 ◽  
Author(s):  
John D Lloyd
Keyword(s):  
New York ◽  
New Hampshire ◽  
Abies Balsamea ◽  
Timber Harvest ◽  
Rapid Expansion ◽  
Current Status ◽  
Conifer Forest ◽  
Southern Limit ◽  
Breeding Range ◽  
Passerella Iliaca

The breeding range of the Red Fox Sparrow (Passerella iliaca iliaca) is generally recognized as comprising the boreal forest of Canada. However, recent observations suggest that the species is present during the summer months throughout much of the northeastern U.S., unexpected for a species characterized as a passage migrant in the region. To clarify, I conducted a literature review to document the historical status of the species in the northeastern U.S. and then analyzed observations submitted to eBird to describe its recent and current status in the region. Historical accounts consistently identify Fox Sparrow as a passage migrant through the region during early spring and late fall. Beginning in the early 1980s, observers began noting regular extralimital records of Fox Sparrow in northern Maine. A single nest was discovered in the state in 1983, and another in northern New Hampshire in 1997. Despite the paucity of breeding records, observations submitted to eBird suggest that the southern limit of the breeding range of Fox Sparrow has expanded rapidly to the south and west in recent years. The proportion of complete checklists submitted to eBird that contained at least one observation of Fox Sparrow grew at an annual rate of 18% from 2003-2016 and was independent of observer effort. Fox Sparrow now occurs regularly on mountaintops and in young stands of spruce (Picea spp.) and balsam fir (Abies balsamea) during the breeding season throughout northern and western Maine and northern New Hampshire, with occasional records from the Green Mountains of Vermont and the Adirondack Mountains of New York. The cause of this rapid expansion of its breeding range is unknown, but may be related to an increase in the amount of young conifer forest in the northeastern U.S. created by commercial timber harvest.

Fox Sparrow (Passerella iliaca)

2002 ◽  
Author(s):  
Jason D. Weckstein ◽  
Donald E. Kroodsma ◽  
Robert C. Faucett
Keyword(s):  
Passerella Iliaca

Demography of Sooty Fox Sparrows (Passerella unalaschcensis) following a shift from a migratory to resident life history

2018 ◽  
Vol 96 (5) ◽  
pp. 436-440 ◽  
Author(s):  
Hannah Visty ◽  
Scott Wilson ◽  
Ryan Germain ◽  
Jessica Krippel ◽  
Peter Arcese
Keyword(s):  
British Columbia ◽  
Life History ◽  
Population Growth ◽  
Vital Rates ◽  
Population Growth Rates ◽  
Probability Of Survival ◽  
Georgia Basin ◽  
Passerella Iliaca ◽  
Resident Populations ◽  
Established Population

Identifying causes and consequences of variation in species life history has the potential to improve predictions about how climate and land-use change may affect the demography and distribution of species in future. Sooty Fox Sparrows (Passerella unalaschcensis (J.F. Gmelin, 1789); or commonly grouped within the Fox Sparrow, Passerella iliaca (Merrem, 1786)) were migrants that rarely bred in the Georgia Basin of British Columbia prior to ∼1950 but have since established resident populations. Data on 270 color-banded birds and 54 nests on Mandarte Island, British Columbia, allowed us to estimate demographic vital rates and population growth in one recently established population. Annual fecundity (F), estimated as the product of the number of broods initiated (1.5 ± 0.01; mean ± SD), clutch size (2.82 ± 0.44), and probability of survival to fledging (0.68 ± 0.02), exceeded values reported for migrants, supporting the hypothesis that residents invest more in reproduction, on average, than migrants within species. Estimating juvenile and adult overwinter survival (Sj = 0.32 ± 0.06 and Sa = 0.69 ± 0.05) next allowed us to simulate an expected distribution of population growth rates as λexp = Sa + (Sj × F), given parameter error. Our estimate of λexp (1.61 ± 0.57) implies expeditious population growth, consistent with the species’ recent colonization of the region.

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