Two Modes of Primary Replacement During Prebasic Molt of Rufous Fantails, Rhipidura rufifrons

Junda, James H.; Crary, Andrea L.; Pyle, Peter

doi:10.1676/1559-4491-124.4.682

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Once evolved, furthermore, exceptions to these sequences are usually conserved among all individuals and species throughout a lineage (Pyle 2013), for example among avian orders Gruiformes, Falconiformes and Psittaciformes, families such as Diomedeidae, and passerine species such as spotted flycatcher (Pyle 2008, 2013, Rohwer and Rohwer 2018, Jenni and Winkler 2020). Rare exceptions to conserved remigial sequences among passerine genera such as Lanius , Locustella , Rhipidura and Muscicapa (Cramp 1988, Junda et al 2012, Kiat 2017, Jenni and Winkler 2020) are perhaps best considered recent or current evolutionary divergences within these lineages (Pyle 2013).…”

Section: A Sequence‐based Approachmentioning

confidence: 99%

Defining moults in migratory birds: a sequence‐based approach

Pyle

2022

Journal of Avian Biology

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Two broad nomenclatures have emerged to describe moult strategies in birds, the 'lifecycle' system which describes moults relative to present-day breeding and other lifehistory events, and the Humphrey-Parkes (H-P) system which reflects the evolution of moults along ancestral lineages. Using either system, challenges have arisen defining strategies in migratory species with more than one moult per year. When all or part of two moults occur in non-breeding areas, extra moults may fail to be recognized or they may have been discriminated temporally, whether feathers are replaced in fall, winter or spring. But in some cases feather replacement can span the non-breeding period, and this has resulted in an inability to identify inserted moults and to compare moult strategies between species. Furthermore, recent analyses on factors influencing the extent of the postjuvenile or preformative moults have either confined this moult to the summer grounds or presumed that it can be suspended and resumed on winter grounds, which has lead to quite divergent results and interpretations. Evolutionarily, the timing, extent and location of moults show phenotypic lability whereas the sequence in which feathers are replaced is comparatively conserved. As, such, I propose defining moults on the basis of feather-replacement sequences as opposed to timing or location of replacement, including strategies in which discrete moults can be suspended for migration and overlap temporally. I provide examples illustrating the functionality of a sequence-based definition in three migratory North American passerines that can undergo feather replacement twice in non breeding areas, and I demonstrate how this system can effectively apply to moults in many other passerine and non-passerine species. I recommend that authors studying the evolutionary drivers of moult strategies in migratory birds adopt a sequence-based approach and to carefully consider replacement strategies both prior to and following autumn migration.

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Section: A Sequence‐based Approachmentioning

confidence: 99%

Defining moults in migratory birds: a sequence‐based approach

Pyle

2022

Journal of Avian Biology

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201

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“…When exceptions to these sequences occur, they are usually found among all individuals and species throughout a lineage once evolved (Pyle 2013), for example among avian orders Gruiformes, Falconiformes, and Psittaformes, families such as Diomedeidae, and passerine species such as Spotted Flycatcher (Pyle 2008(Pyle , 2013Rohwer and Rohwer 2018;Jenni and Winkler 2020). Rare exceptions to fixed remigial sequences among passerine genera such as Lanius, Locustella, Rhipudura, and Muscicapa (Cramp 1988, Junda et al 2012, Kiat 2017, Jenni and Winkler 2020 are perhaps best considered recent or current evolutionary divergences within these taxonomic lineages.…”

Section: A Sequence-based Approachmentioning

confidence: 99%

Defining Moults in Migratory Birds: A Sequence-based Approach

Pyle

2021

Preprint

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Two broad nomenclatures have emerged to describe moult strategies in birds, the "life-cycle" system which describes moults relative to present-day breeding and other life-history events and the Humphrey-Parkes (H-P) system which reflects the evolution of moults along ancestral lineages. Using either system, challenges have arisen defining strategies in migratory species with more than one moult per year. When all or part of two moults occur in non-breeding areas they may fail to be recognized as two moults or have been discriminated temporally, whether feathers are replaced in fall, winter, or spring. But in some cases feather replacement can span the non-breeding period, and this has resulted in an inability to identify inserted moults and to compare moult strategies between species. Furthermore, recent analyses on factors influencing the extent of the postjuvenile or preformative moults have either confined this moult to the summer grounds or presumed that it can be suspended and resumed on winter grounds, which has lead to quite divergent results. Evolutionarily, the timing, extent, and location of moults are very plastic whereas the sequence in which feathers are replaced is comparatively fixed. As, such, I propose taking an evolutionary approach to define moults on the basis of feather-replacement sequences as opposed to timing or location of replacement, including strategies in which moults can overlap temporally. I provide examples illustrating the functionality of a sequence-based definition in three migratory North American passerines that can undergo feather replacement twice in non breeding areas, and I demonstrate how this system can effectively apply to moults in many other passerine and non-passerine species. I recommend that authors studying the evolutionary drivers of moult strategies in migratory birds adopt a sequence-based approach or carefully consider replacement strategies both prior to and following autumn migration.

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“…) and preformative (equivalent to pre‐juvenile) moults of passerines: the former commences with the innermost primary in most species, although nodal primaries can occasionally vary, even within species (Junda et al . ), and the latter can commence with other primaries within the tract (Jenni & Winkler , Pyle ). Moult extent has been assessed by feather tract for many species (e.g.…”

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confidence: 99%

“…Research on moult sequence (e.g. Rohwer & Wang 2010, Junda et al 2012, Pyle 2013) and extent (e.g. Gosler 1994, Deviche 2000, Okahisa et al 2013) has focused primarily on wing feather tracts and rectrices, although there has been important work on moult other than remiges and *Corresponding author.…”

mentioning

confidence: 99%

“…Williamson 1956, Pyle 2008. Sequence and extent do not maintain a straightforward relationship as can be easily seen by comparing the nodal feathers of prebasic (equivalent to post-nuptial; new nomenclature follows Howell et al 2003) and preformative (equivalent to pre-juvenile) moults of passerines: the former commences with the innermost primary in most species, although nodal primaries can occasionally vary, even within species (Junda et al 2012), and the latter can commence with other primaries within the tract (Jenni & Winkler 1994, Pyle 1998. Moult extent has been assessed by feather tract for many species (e.g.…”

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Moult topography and its application to the study of partial wing‐moult in two neotropical wrens

Guallar¹,

Ruiz‐Sánchez

Rueda‐Hernández

et al. 2014

Ibis

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During partial moults birds replace a variable number or percentage of old feathers. This quantity, known as moult extent, has been a primary variable used in comparative studies. However, different spatial configurations of feather replacement may result from an equal number of renewed feathers. Few studies have addressed spatial aspects of moult, which may vary among species, among individuals of the same species and between episodes at the individual level. We present a novel approach to quantify the spatial configuration of a wing‐moult episode, hereafter referred to as moult topography, which comprises two elements, namely extent and vector, the latter condensing the spatial configuration of the replaced feathers on the wing plane. We apply this method to investigate preformative (post‐juvenile) wing‐feather moult pattern in the Spot‐breasted Wren Pheugopedius maculipectus and the White‐breasted Wood‐Wren Henicorhina leucosticta. We specified a null model of wing‐moult topography by which feather replacement follows a discrete anterior–posterior (vertical) axis between tracts and a discrete proximal–distal (horizontal) axis within tracts, and whereby wing feathers from a new tract are replaced only if all the feathers from the previous (anterior) tract have been replaced. Our sample of Spot‐breasted Wrens showed a strict single pattern of replacement that did not differ significantly from the null model. Our sample of White‐breasted Wood‐Wrens, however, differed significantly from the null model, showing prioritization of proximal wing feathers closer to the body. These differences might have biological relevance, for example in mate selection or in response to different environmental stressors, and might reveal the influence of these factors on the evolution of moult strategies. Overall, moult topography provides a new approach to future ecological and evolutionary studies of moult.

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Two Modes of Primary Replacement During Prebasic Molt of Rufous Fantails, Rhipidura rufifrons

Cited by 7 publications

References 22 publications

Defining moults in migratory birds: a sequence‐based approach

Defining moults in migratory birds: a sequence‐based approach

Defining Moults in Migratory Birds: A Sequence-based Approach

Moult topography and its application to the study of partial wing‐moult in two neotropical wrens

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