NDLI: Ferruginous Hawks Buteo regalis alter parental behaviours in response to approaching storms

Content Provider	Springer Nature Link
Author	Laux, Chelsey M. rdell, Cameron J. Fisher, Ryan J. Ng, Janet W. Wellicome, Troy I. Bayne, Erin M.
Copyright Year	2015
Abstract	Heavy and frequent rain, low temperatures, and strong winds may decrease adult foraging time, cause thermoregulatory stress on nestlings, and lead to nest damage or destruction, all of which can negatively affect breeding success. However, certain parental behaviours can mitigate these potentially negative effects of inclement weather. We examined how parents could mitigate these negative weather effects by adjusting three behaviours—nest attendance, prey deliveries, and nest maintenance—before, during, and after storms at 11 nests of the at-risk Ferruginous Hawk (Buteo regalis) in Canada. Female adults spent an increasing amount of time on the nest as wind speed increased. Similar numbers of prey were delivered before and after storms, suggesting that Ferruginous Hawks do not compensate for lost foraging time. They appeared to demonstrate an ability to detect approaching storms, possibly by responding to falling barometric pressure cues, and may have mitigated the risk of nest damage by increasing their nest maintenance behaviours. Our study is among the first to observe storm preparation behaviour, and indicates that some raptorial birds have the ability to alter nesting behaviour in response to approaching inclement weather. Königsbussarde (Buteo regalis) verändern das elterliche Verhalten bei heraufziehenden Stürmen Starke und andauernde Regenfälle, niedrige Temperaturen und starke Winde können die Zeit der Nahrungssuche von Adulten verringern. Dies verursacht thermoregulatorischen Stress bei den Nestlingen und kann zu Schaden oder Vernichtung der Brut führen, was insgesamt den Bruterfolg negativ beeinflussen kann. Dennoch können bestimmte elterliche Verhaltensweisen diese potentiell negativen Schlecht-Wetter-Effekte abmildern. Wir untersuchten, wie Eltern diese negativen Wettereinflüsse durch die Anpassung von drei Verhaltensweisen abschwächen konnten: Anwesenheit am Nest, Beuteübergaben und Brutpflege vor, während und nach Stürmen an 11 Nestern des gefährdeten Königsbussard (Buteo regalis) in Kanada. Adulte Weibchen verbrachten mehr Zeit auf dem Nest mit zunehmender Windgeschwindigkeit und stärker werdenden Regenfällen. Vor und nach den Stürmen wurden ähnliche Anzahlen an Beuteobjekten eingetragen, was darauf hindeutet, dass Königsbussarde verlorene Zeiten zur Nahrungssuche nicht kompensieren. Königsbussarde scheinen die Fähigkeit zu haben, heraufziehende Stürme zu erkennen, in dem sie auf fallenden Luftdruck reagieren und das Risiko eines Brutverlustes durch zunehmende Brutpflege minimieren. Unsere Studie gehört zu den ersten, die sturmvorbereitendes Verhalten beobachten konnte und zeigt, dass Greifvögel in der Lage sind, ihr Brutverhalten als Antwort auf raue Witterungsbedingungen anzupassen.
Starting Page	355
Ending Page	362
Page Count	8
File Format	PDF
ISSN	21937192
Journal	Journal für Ornithologie
Volume Number	157
Issue Number	1
e-ISSN	21937206
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-15
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Foraging Nest maintenance Extreme weather Nest failure Thermoregulation Zoology Ecology Fish & Wildlife Biology & Management
Content Type	Text
Resource Type	Article

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