scholarly journals The Influence of Different Cover Types on American Robin Nest Success in Organic Agroecosystems

2013 ◽  
Vol 5 (8) ◽  
pp. 3502-3512 ◽  
Author(s):  
John Quinn ◽  
Amy Oden ◽  
James Brandle
Keyword(s):  
Nest Success ◽  
American Robin

Identifying predators clarifies predictors of nest success in a temperate passerine

2010 ◽  
Vol 79 (1) ◽  
pp. 225-234 ◽  
Author(s):  
Thomas J. Benson ◽  
Jeremy D. Brown ◽  
James C. Bednarz
Keyword(s):  
Nest Success

scholarly journals Greater prairie-chicken nest success and habitat selection in southeastern Nebraska

2013 ◽  
Vol 77 (6) ◽  
pp. 1202-1212 ◽  
Author(s):  
Ty W. Matthews ◽  
Andrew J. Tyre ◽  
J. Scott Taylor ◽  
Jeffrey J. Lusk ◽  
Larkin A. Powell
Keyword(s):  
Habitat Selection ◽  
Nest Success ◽  
Prairie Chicken ◽  
Greater Prairie Chicken

Grooming in the veery and the American robin: Evidence for a simple timing hierarchy

1986 ◽  
Vol 12 (3) ◽  
pp. 227-236 ◽  
Author(s):  
Karen K. Hatch ◽  
Louis Lefebvre ◽  
R.E. Lemon
Keyword(s):  
American Robin

scholarly journals Nesting strategy shapes territorial aggression but not testosterone: a comparative approach in female and male birds

2020 ◽  
Author(s):  
SE Lipshutz ◽  
KA Rosvall
Keyword(s):  
Tree Swallow ◽  
Comparative Approach ◽  
Female Competition ◽  
American Robin ◽  
Territorial Aggression ◽  
Physical Attack ◽  
Cavity Nesting ◽  
Comparative Framework ◽  
Underlying Mechanisms ◽  
Close Relatives

Our understanding of the proximate and ultimate mechanisms shaping competitive phenotypes primarily stems from research on male-male competition for mates, even though female-female competition is also widespread. Obligate secondary cavity-nesting has evolved repeatedly across avian lineages, providing a useful comparative context to explore how competition over limited nest cavities shapes aggression and its underlying mechanisms across species. Although evidence from one or another cavity-nesting species suggests that territorial aggression is adaptive in both females and males, this has not yet been tested in a comparative framework. We tested the hypothesis that cavity-nesting generates more robust territorial aggression, in comparison to close relatives with less restrictive nesting strategies. Our focal species were two obligate secondary cavity-nesting species and two related species with more flexible nesting strategies in the same avian family: tree swallow (Tachycineta bicolor) vs. barn swallow (Hirundo rustica); Eastern bluebird (Sialia sialis) vs. American robin (Turdus migratorius). We assayed conspecific territorial aggression, and found that cavity-nesting species physically attacked a simulated intruder more often than their close relatives. This pattern held for both females and males. Because territorial aggression is often associated with elevated testosterone, we also hypothesized that cavity-nesting species would exhibit higher testosterone levels in circulation. However, cavity-nesting species did not have higher testosterone in circulation for either sex, despite some correlative evidence that testosterone is associated with higher rates of physical attack in female tree swallows. Our focus on a competitive context that is relevant to both sexes – competition over essential breeding resources – provides a useful comparative framework for co-consideration of proximate and ultimate drivers of reproductive competition in females and males.

scholarly journals Greater Sage-Grouse nest bowls buffer microclimate in a post-megafire landscape although effects on nest survival are marginal

The Condor ◽  
2021 ◽  
Vol 123 (1) ◽  
Author(s):  
Christopher R Anthony ◽  
Christian A Hagen ◽  
Katie M Dugger ◽  
R Dwayne Elmore
Keyword(s):  
Site Selection ◽  
Nest Site ◽  
Spatial Scales ◽  
Nest Success ◽  
Nest Survival ◽  
Nest Site Selection ◽  
Bare Ground ◽  
Sage Grouse ◽  
Burned Areas ◽  
Visual Obstruction

Abstract Temperature at fine spatial scales is an important driver of nest site selection for many avian species during the breeding season and can influence nest success. Sagebrush (Artemisia spp.) communities have areas with high levels of vegetation heterogeneity and high thermal variation; however, fire removes vegetation that provides protection from predators and extreme environmental conditions. To examine the influence of microclimates on Greater Sage-Grouse (Centrocercus urophasianus) nest site selection and nest success in a fire-affected landscape, we measured black bulb temperature (Tbb) and vegetation attributes (e.g., visual obstruction) at 3 spatial scales (i.e. nest bowl, microsite, and landscape) in unburned and burned areas. Nest bowls exhibited greater buffering of Tbb than both nearby microsites and the broader landscape. Notably, nest bowls were warmer in cold temperatures, and cooler in hot temperatures, than nearby microsites and the broader landscape, regardless of burn stage. Nest survival (NS) was higher for nests in unburned areas compared to nests in burned areas (unburned NS = 0.43, 95% confidence interval [CI]: 0.33–0.54; burned NS = 0.24, 95% CI: 0.10–0.46). The amount of bare ground was negatively associated with NS, but effects diminished as the amount of bare ground reached low levels. Shrub height and visual obstruction were positively associated with NS during the entire study period, whereas minimum Tbb had a weaker effect. Our findings demonstrate that thermoregulatory selection by Greater Sage-Grouse at nest sites had marginal effects on their NS. However, given that increases in vegetation structure (e.g., shrub height) provide thermal refuge and increase NS, vegetation remnants or regeneration in a post-fire landscape could be critical to Greater Sage-Grouse nesting ecology.

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