Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)

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Understanding the annual cycle of migratory birds is imperative for evaluating the evolution of life-history strategies and developing effective conservation strategies. Yet, we still know little about the annual cycle of migratory birds that breed at south-temperate latitudes of South America. We a...

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Autores principales: Jahn, A.E., Giraldo, J.I., MacPherson, M., Tuero, D.T., Sarasola, J.H., Cereghetti, J., Masson, D.A., Morales, M.V.
Formato: JOUR
Materias:
Argentina
Colombia
feather
llanos
rectrix
remige
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02738570_v87_n2_p143_Jahn
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02738570_v87_n2_p143_Jahn
record_format dspace
spelling todo:paper_02738570_v87_n2_p143_Jahn2023-10-03T15:15:54Z Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana) Jahn, A.E. Giraldo, J.I. MacPherson, M. Tuero, D.T. Sarasola, J.H. Cereghetti, J. Masson, D.A. Morales, M.V. Argentina Colombia feather llanos rectrix remige Understanding the annual cycle of migratory birds is imperative for evaluating the evolution of life-history strategies and developing effective conservation strategies. Yet, we still know little about the annual cycle of migratory birds that breed at south-temperate latitudes of South America. We aged, sexed, and determined the progression and intensity of body, remige, and rectrix molt of migratory Fork-tailed Flycatchers (Tyrannus s. savana) at breeding sites in southern South America and at wintering sites in northern South America. Molt of both body and flight feathers occurred primarily during the winter. In early winter, a similar proportion of young and adult flycatchers molted remiges and rectrices, but remige molt intensity (number of remiges molting) was greater and primary molt progression (mean primary feather molting) more advanced in adults. In late winter, remige molt intensity and primary molt progression did not differ between age groups. We found no difference between males and females either in the proportion of individuals molting in winter or in the intensity or progress of remige molt. Our results suggest that the nominate subspecies of Fork-tailed Flycatcher undergoes one complete, annual molt on the wintering grounds, and represents the first comprehensive evaluation of molt timing of a migratory New World flycatcher that overwinters in the tropics. Given that breeding, molt, and migration represent three key events in the annual cycle of migratory birds, knowledge of the timing of these events is the first step toward understanding the possible tradeoffs migratory birds face throughout the year. © 2016 Association of Field Ornithologists. Fil:Tuero, D.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02738570_v87_n2_p143_Jahn
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Colombia
feather
llanos
rectrix
remige
spellingShingle Argentina
Colombia
feather
llanos
rectrix
remige
Jahn, A.E.
Giraldo, J.I.
MacPherson, M.
Tuero, D.T.
Sarasola, J.H.
Cereghetti, J.
Masson, D.A.
Morales, M.V.
Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)
topic_facet Argentina
Colombia
feather
llanos
rectrix
remige
description Understanding the annual cycle of migratory birds is imperative for evaluating the evolution of life-history strategies and developing effective conservation strategies. Yet, we still know little about the annual cycle of migratory birds that breed at south-temperate latitudes of South America. We aged, sexed, and determined the progression and intensity of body, remige, and rectrix molt of migratory Fork-tailed Flycatchers (Tyrannus s. savana) at breeding sites in southern South America and at wintering sites in northern South America. Molt of both body and flight feathers occurred primarily during the winter. In early winter, a similar proportion of young and adult flycatchers molted remiges and rectrices, but remige molt intensity (number of remiges molting) was greater and primary molt progression (mean primary feather molting) more advanced in adults. In late winter, remige molt intensity and primary molt progression did not differ between age groups. We found no difference between males and females either in the proportion of individuals molting in winter or in the intensity or progress of remige molt. Our results suggest that the nominate subspecies of Fork-tailed Flycatcher undergoes one complete, annual molt on the wintering grounds, and represents the first comprehensive evaluation of molt timing of a migratory New World flycatcher that overwinters in the tropics. Given that breeding, molt, and migration represent three key events in the annual cycle of migratory birds, knowledge of the timing of these events is the first step toward understanding the possible tradeoffs migratory birds face throughout the year. © 2016 Association of Field Ornithologists.
format JOUR
author Jahn, A.E.
Giraldo, J.I.
MacPherson, M.
Tuero, D.T.
Sarasola, J.H.
Cereghetti, J.
Masson, D.A.
Morales, M.V.
author_facet Jahn, A.E.
Giraldo, J.I.
MacPherson, M.
Tuero, D.T.
Sarasola, J.H.
Cereghetti, J.
Masson, D.A.
Morales, M.V.
author_sort Jahn, A.E.
title Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)
title_short Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)
title_full Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)
title_fullStr Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)
title_full_unstemmed Demographic variation in timing and intensity of feather molt in migratory Fork-tailed Flycatchers (Tyrannus s. savana)
title_sort demographic variation in timing and intensity of feather molt in migratory fork-tailed flycatchers (tyrannus s. savana)
url http://hdl.handle.net/20.500.12110/paper_02738570_v87_n2_p143_Jahn
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