Aggressive behavior by Western Bluebirds (Sialia mexicana) varies with anthropogenic disturbance to breeding habitat

2015 ◽  
Vol 127 (3) ◽  
pp. 421-431 ◽  
Author(s):  
Manisha Bhardwaj ◽  
Catherine A. Dale ◽  
Laurene M. Ratcliffe
Keyword(s):  
Aggressive Behavior ◽  
Anthropogenic Disturbance ◽  
Breeding Habitat ◽  
Sialia Mexicana ◽  
Western Bluebirds

LIFE-HISTORY VARIATION AND DEMOGRAPHY IN WESTERN BLUEBIRDS (SIALIA MEXICANA) IN OREGON

The Auk ◽  
2004 ◽  
Vol 121 (1) ◽  
pp. 118 ◽  
Author(s):  
Amber J. Keyser ◽  
Marilynne T. Keyser ◽  
Daniel E. L. Promislow
Keyword(s):  
Life History ◽  
Life History Variation ◽  
Sialia Mexicana ◽  
Western Bluebirds

Sex bias in parental care is associated with brood age and fledglings’ growth rate in Western Bluebirds Sialia mexicana

2020 ◽  
Author(s):  
Belgica Porras-Reyes ◽  
Sergio Ancona ◽  
Alejandro Ariel Ríos-Chelén ◽  
Amando Bautista ◽  
Bibiana Montoya
Keyword(s):  
Growth Rate ◽  
Parental Care ◽  
Sex Bias ◽  
Sialia Mexicana ◽  
Western Bluebirds

scholarly journals Bird Use of Northern Alaska Oilfield Rehabilitation Sites

ARCTIC ◽  
2018 ◽  
Vol 71 (4) ◽  
pp. 422-430
Author(s):  
Rebecca Bentzen ◽  
Joe Liebezeit ◽  
Martin Robards ◽  
Bill Streever ◽  
Samantha Strindberg ◽  
...  
Keyword(s):  
Anthropogenic Disturbance ◽  
Industrial Development ◽  
Migratory Birds ◽  
Breeding Habitat ◽  
The Arctic ◽  
Reference Sites ◽  
Breeding Bird ◽  
The North ◽  
North Slope Of Alaska ◽  
Northern Alaska

Breeding bird response to habitat rehabilitation after anthropogenic disturbance has received little attention in the Arctic. The North Slope of Alaska is an important breeding ground for many populations of migratory birds and has also supported major oilfields since the late 1960s. The most obvious impacts of industrial development to nesting birds are direct habitat loss and fragmentation resulting from the construction of infrastructure, along with increased mechanical noise, vehicle traffic, and other forms of anthropogenic disturbance. In response to state and federal requirements, efforts have been made to rehabilitate abandoned portions of the oilfields. We compared bird use at rehabilitation sites and at nearby paired reference sites. Densities of shorebirds and passerines varied between rehabilitation sites and reference sites, but waterfowl densities did not. Specifically, passerine and shorebird densities were higher at reference sites in the early or mid-season and lower at reference sites in the late season. Additionally, birds on rehabilitation sites were primarily observed foraging and resting, while behavior observed on paired reference sites was more diverse and included courtship displays, nesting, and aggression. Further, rehabilitation sites supported significantly fewer nests and fewer species than recorded at reference sites. Our findings suggest that sites 3 to 10 years post rehabilitation do not provide bird habitat comparable to nearby reference sites and, by extension, do not provide shorebird and passerine habitat comparable to that found prior to development. However, rehabilitation sites appear to provide adequate habitat for waterfowl and are important to shorebirds and passerines as foraging areas. Continued monitoring will be needed to establish the long-term suitability of rehabilitation sites, compared to reference sites, as breeding habitat for birds.

scholarly journals Sex ratio of Western Bluebirds ( Sialia mexicana ) is mediated by phenology and clutch size

Ibis ◽  
2021 ◽  
Author(s):  
Andrew W. Bartlow ◽  
Mark D. Jankowski ◽  
Charles D. Hathcock ◽  
Randall T. Ryti ◽  
Steven L. Reneau ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Clutch Size ◽  
Sialia Mexicana ◽  
Western Bluebirds

scholarly journals Partitioning Risk Among Different Causes of Nest Failure

The Auk ◽  
2007 ◽  
Vol 124 (2) ◽  
pp. 432-443 ◽  
Author(s):  
Matthew A. Etterson ◽  
Laura R. Nagy ◽  
Tara Rodden Robinson
Keyword(s):  
Nest Predation ◽  
Classification Error ◽  
Nest Failure ◽  
Cavity Nesters ◽  
Estimated Parameters ◽  
Cavity Nesting ◽  
Sialia Mexicana ◽  
Adverse Weather ◽  
Western Bluebirds ◽  
Egg Failure

Abstract Nest predation and nest parasitism receive the most attention as causes of nest failure for North American songbirds. Yet for many populations, interspecific competition, adverse weather, abandonment, nestling starvation, and egg failure may also be significant causes of nest failure. Despite the long interest in differential failure, serious challenges remain in the estimation of separate probabilities of nest failure from different causes. Apparent rates of failure suffer from at least two sources of bias: heterogeneous ages at discovery and classification error. We developed maximum-likelihood estimators for cause-specific daily probabilities of nest failure. We further show how the estimators can be extended to include classification error, if known. Finally, we demonstrate a simple application to Loggerhead Shrikes (Lanius ludovicianus), Tree Swallows (Tachycineta bicolor), Violet-green Swallows (T. thalassina), and Western Bluebirds (Sialia mexicana). Daily probabilities of survival were lower for the Loggherhead Shrike (0.978 ± 0.004) than for any of the three cavity-nesting species (range: 0.989 ± 0.002 − 0.993 ± 0.001). Weather was an important cause of nest failure for Loggerhead Shrikes (0.15 ± 0.05 overall). Conversely, competition among secondary cavity-nesters was not an important contributor to nest failure (range: 2–5% of nest failures) for bluebirds or swallows. Our estimator differs from others by allowing multiple fates to be modeled as separately estimated parameters rather than as covariates to a single estimated failure probability. Thus, our estimator should be viewed as an important complement to existing methods. División del Riesgo Entre Diferentes Causas de Fracaso Durante la Nidificación

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