High-Latitude Passerine Migrants Overlap Energetically Demanding Events in Autumn

Benson, Anna-Marie; Winker, Kevin

doi:10.1676/14-034.1

Cited by 6 publications

(12 citation statements)

References 35 publications

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“…For the alternative factors tested, only migration distance was associated with moult-migration; winter territoriality and number of broods were not present in the best models. As expected, longer migration distances were associated with moult-migration: by imposing a time constraint, they would force moult outside of the breeding grounds [18,19]. This result is in accordance with previous European studies on Sylviidae [19] and Western Palearctic passerines [44] that indicated longer migration distance as a driver of moulting strategies differing from the ancestral state (moult on the breeding grounds) [3].…”

Section: Discussionsupporting

confidence: 91%

“…Several drivers of moult-migration evolution have been hypothesized, such as migration distance, aridity of the breeding grounds during the post-breeding period, winter territoriality, length of the breeding season and number of broods produced during the breeding season. Long migration distances and a long breeding season, especially if raising multiple broods, may reduce the time available between the end of breeding and start of migration and not allow for the replacement of all feathers [18][19][20][21]. Arid breeding grounds could select for moult-migration because the lack of resources at the end of summer in western North America limits the ability to grow feathers of sufficient quality [14,22].…”

Section: Introductionmentioning

confidence: 99%

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Evolution of moult-migration is directly linked to aridity of the breeding grounds in North American passerines

et al. 2020

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To avoid energy allocation conflicts, birds generally separate breeding, migration and moult during the annual cycle. North American passerines typically moult on the breeding grounds prior to autumn migration. However, some have evolved a moult-migration strategy in which they delay moult until stopping over during autumn migration. Rohwer et al . (2005) proposed the ‘push–pull hypothesis' as an explanation for the evolution of this moult strategy, but it has not been empirically tested. Poor conditions on the breeding grounds at the end of the summer would push birds to depart prior to moult, while productive stopover locations would pull them. We tested for a relationship between moult-migration and breeding grounds aridity as measured by the normalized difference vegetation index. Our results strongly support the ‘push' aspect of the push–pull hypothesis and indicate that arid breeding grounds, primarily in western North America, would drive species to evolve stopover moult-migration, although this relationship may depend upon migration distance.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Evolution of moult-migration is directly linked to aridity of the breeding grounds in North American passerines

et al. 2020

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“…These costs may include overlap of molt with migration (Benson andWinker 2015, Holmgren andHedenstrom 1995), molting outside an ideal productive season (Tonra and Reudink 2018), and hormonal limitations. Birds are limited hormonally in their ability to mount an adrenal response to stressors, because corticosterone, the primary hormone that initiates this pathway, negatively affects feather quality during feather growth (DesRochers et al 2009), and must be downregulated during molt (Romero et al 2005).…”

Section: Molt: Renewal Of Functionmentioning

confidence: 99%

On the Multifunctionality of Feathers and the Evolution of BIrds

Terrill¹,

Shultz²

2021

Preprint

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The ability feathers have to perform many functions simultaneously and at different times is integral to the evolutionary history of all birds. Many studies focus on single functions of feathers; but any given feather performs many functions over its lifetime. Here, we review the known functions of feathers and discuss the interactions of these functions with avian evolution. Recent years have seen an increase in research on the evolution and development of feather functions because of an increase in high quality fossils with preserved feathers, new tools for understanding genetic mechanisms of feather development, new tools for measuring and analyzing feather color, availability of phylogenies and phylogenetic comparative methods, and an increase in interest in feather molt. Here, we aim to review how feather functions interact with avian evolution, with a focus on recent technological and discovery-based advances. By synthesizing research into feather functions over hierarchical scales, we aim to provide a broad context for how the adaptability and multifunctionality of feathers have allowed birds to diversify into the astounding array of environments and life-history strategies. Overall, we suggest research into avian evolution that involves feather function in any way should consider all aspects of a feathers’ functionality, including multiple functions, molt patterns, ecological/mechanical interactions, and feather wear over time. With this more holistic view, processes such as the evolution of avian coloration and flight can be understood in a broader and more nuanced context.

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“…Another is a negative effect on clutch size (Rowe et al 1994), and yet another is in the degree to which high-latitude populations overlap the energetically demanding life stages of reproduction, molt, and migration, long considered to be so energy intensive as to be separated temporally among most birds (e.g., Payne 1972, Cannell et al 1983, Vega-Rivera et al 1998. It is no accident that the highest levels of overlap between these energetically costly stages are being found among high-latitude populations, where evidently there is simply not enough time to spread them out as at lower latitudes (Rimmer 1988, Flockhart 2010, Benson and Winker 2015.…”

Section: Range Expansionsmentioning

confidence: 99%

“…For example, among 17 species of passerine migrants at Fairbanks, Alaska, Benson and Winker (2015) found a negative correlation between the length of occupancy of the breeding ground (defined by the difference between median spring and autumn dates of passage) and the amount of overlap of molt and migration. In addition, they found high levels of overlap of molt with fat accumulation.…”

Section: Range Expansionsmentioning

confidence: 99%

Some broad-scale effects of recent and future climate change among migratory birds in Beringia

Winker¹,

Gibson²

2017

Trends and Traditions: Avifaunal Change in Western North America

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Birds from all seven continents come to Beringia to breed in the northern summer. For birds breeding there, Beringia’s position at the head of the Pacific Ocean requires substantial longitudinal (east to west and west to east) movements coming and going. These movements are most apparent to us in continental “crossover” species, Asian taxa breeding in North America and North American birds breeding in Asia. Those individuals reaching range limits in Beringia commonly travel long distances to take advantage of short summers, and many of their range limits are likely caused by time constraints: travel time plus the time required to successfully reproduce and (for most) to molt must fit into the finite constraints of the length of the summer. These constraints become most apparent when a breeding range limit is longitudinally distant from the nearest wintering area, and the most visible examples involve species whose ranges stop before the limit of apparently appropriate habitat. It is these species whose ranges we expect to change most rapidly when even small increases in the time available at high latitudes (i.e., a longer growing season) give them more time to travel farther east or west at these latitudes.

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High-Latitude Passerine Migrants Overlap Energetically Demanding Events in Autumn

Cited by 6 publications

References 35 publications

Evolution of moult-migration is directly linked to aridity of the breeding grounds in North American passerines

Evolution of moult-migration is directly linked to aridity of the breeding grounds in North American passerines

On the Multifunctionality of Feathers and the Evolution of BIrds

Some broad-scale effects of recent and future climate change among migratory birds in Beringia

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