Sibling Competition Induces Stress Independent of Nutritional Status in Broods of Upland Buzzards

Yosef, Reuven; Gombobaatar, Sundev; Bortolotti, Gary R.

doi:10.3356/jrr-12-14.1

Cited by 16 publications

(10 citation statements)

References 41 publications

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“…We did not find a significant influence of either hatch order or number of siblings on feather CORT. A previous study of plasma CORT in brown pelican nestlings (Eggert et al ., 2010) also found no effect of brood size or hatch order on stress levels; however, sibling dynamics have been found to affect feather CORT levels in nestling raptors (Yosef et al ., 2013; López-Jiménez et al ., 2016). We did find an influence of microhabitat characteristics (elevated vs. ground nest location) on feather CORT.…”

Section: Discussionmentioning

confidence: 98%

Physical condition and stress levels during early development reflect feeding rates and predict pre- and post-fledging survival in a nearshore seabird

2016

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Snapshot nestling health measures can reveal reproductive effects of environmental stress while minimizing handling, disturbance and researcher effort. We tested two short-term measurements, body condition and feather corticosterone, as predictors of brown pelican nestling survival. Both measurements predicted nestling survival to fledge, and feather corticosterone also predicted post-fledging survival.

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Section: Discussionmentioning

confidence: 98%

Physical condition and stress levels during early development reflect feeding rates and predict pre- and post-fledging survival in a nearshore seabird

2016

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“…Since then, fault bars have attracted the attention of bird keepers (Ward & Slaughter, 1968;Taylor, 1991), veterinarians (Hudelson & Hudelson, 1995;Beynon, Forbes & Harcourt-Brown, 1996;Koutsos, Matson & Klasing, 2001;Koski, 2002;Rubinstein & Lightfoot, 2012) and ornithologists (e.g. Slagsvold, 1982;Murphy, King & Lu, 1988;Gombobaatar, Yosef & Birazana, 2009;Yosef, Gombobaatar & Bortolotti, 2013;Eggers & Low, 2014;Jovani, Montalvo & Sabaté, 2014). Most research has focused on identifying the external and physiological factors that may stimulate the formation of fault bars and the proximate mechanisms by which the fault bars are generated during feather growth.…”

Section: Introductionmentioning

confidence: 98%

Fault bars in bird feathers: mechanisms, and ecological and evolutionary causes and consequences

Jovani

Rohwer

2016

Biological Reviews

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Fault bars are narrow malformations in feathers oriented almost perpendicular to the rachis where the feather vein and even the rachis may break. Breaks in the barbs and barbules result in small pieces of the feather vein being lost, while breaks in the rachis result in loss of the distal portion of the feather. Here, we provide a comprehensive review of 74 papers on fault bar formation in hopes of providing a clearer approach to their study. First, we review the evidence that the propensity to develop fault bars is modified by natural selection. Given that fault bars persist in the face of survival costs, we conclude that they must be an unfortunate consequence of some alternative adaptation that outweighs the fitness costs of fault bars. Second, we summarize evidence that the development of fault bars is triggered by psychological stress such as that of handling or predation attempts, and that they persist because the sudden contractions of the muscles in the feather follicle that control fright moults also causes the development of fault bars in growing feathers. Third, we review external and physiological (e.g. corticosterone) agents that may affect the likelihood that an acute stress will result in a growing feather exhibiting a fault bar. These modifying factors have often been treated as fundamental causes in the earlier literature on fault bars. Fourth, we then use this classification to propose a tentative model where fault bars of different severity (from light to severe) are the outcome of the interaction between the propensity to produce fault bars (which differs between species, individuals and feather follicles within individuals) and the intensity of the perturbation. This model helps to explain contradictory results in the literature, to identify gaps in our knowledge, and to suggest further studies. Lastly, we discuss ways in which better understanding of fault bars can inform us about other aspects of avian evolutionary ecology, such as the physiology of moult, the integration of moult into avian life cycles, and the strategies used to minimize stress during moult. Moreover, the study of fault bars may be relevant to understanding the aerodynamics of flight and the early evolution of flight.

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“…Bourgeon et al, 2014;Carbajal et al, 2014;Sepp et al, 2014) but these are in the minority. Concentrations of CORT in feathers have been shown to vary in response to life history events (Bortolotti et al, 2008;Crossin et al, 2013), sibling competition (Yosef et al, 2013), health status (Harriman et al, 2014;Meitern et al, 2013;Mougeot et al, 2010;Sild et al, 2014), overwinter survival (Koren et al, 2012), food limitation , reproductive investment (Fairhurst et al, 2012a;Kouwenberg et al, 2013), and with environmental conditions (Carrete et al, 2013;Fairhurst et al, 2011;Fairhurst et al, 2012b;Legagneux et al, 2013). Feather CORT concentrations have also been shown to be related to problem solving and learning (Bókony et al, 2014), and to feather pigmentation (Fairhurst et al, 2014;Kennedy et al, 2013;Lendvai et al, 2013;Martínez-Padilla et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Feather corticosterone content in predatory birds in relation to body condition and hepatic metal concentration

Strong

Pereira

Shore

et al. 2015

General and Comparative Endocrinology

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Article (refereed) -postprintStrong, Rebecca J.; Pereira, M. Gloria; Shore, Richard F.; Henrys, Peter A.; Pottinger, Tom G. 2015. Feather corticosterone content in predatory birds in relation to body condition and hepatic metal concentration.Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. feather CORT content and condition were observed in only tawny owl and kestrel. In sparrowhawks, feather CORT concentration was found to be positively related to the hepatic concentrations of five metals (Cd, Mn, Co, Cu, Mo) and the metalloid As. There was also a negative relationship between measures of condition and total hepatic metal concentration in males. The results suggest that some factors affecting CORT uptake by feathers remain to be resolved but feather CORT content from archived specimens has the potential to provide a simple effects biomarker for exposure to environmental contaminants.

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Sibling Competition Induces Stress Independent of Nutritional Status in Broods of Upland Buzzards

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 16 publications

References 41 publications

Physical condition and stress levels during early development reflect feeding rates and predict pre- and post-fledging survival in a nearshore seabird

Physical condition and stress levels during early development reflect feeding rates and predict pre- and post-fledging survival in a nearshore seabird

Fault bars in bird feathers: mechanisms, and ecological and evolutionary causes and consequences

Feather corticosterone content in predatory birds in relation to body condition and hepatic metal concentration

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