Evolution of short tails and breakdown of honest signaling system during a severe winter in the Pacific swallow Hirundo tahitica

Hasegawa, Masaru; Arai, Emi; Ito, Shosuke; Wakamatsu, Kazumasa

doi:10.1007/s10682-019-09978-z

Cited by 7 publications

(2 citation statements)

References 45 publications

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“…Individuals with redder plumage who are in better condition during moult would maintain superior body condition during other periods (e.g., during the breeding season: Arai et al., 2018). In fact, the abovementioned study on Pacific swallows demonstrated that individuals with more pheomelanin pigments (i.e., those with redder plumage) are in better physiological conditions during the severe weathers (Hasegawa et al., 2019). Thus, preferential mating with these individuals will achieve high fitness even during sudden environmental changes.…”

Section: Discussionmentioning

confidence: 99%

“…Tail ornamentation reduces the amount of prey capture and, moreover, narrows the foraging niches (e.g., elongated tails have difficulty to capture large preys due to limited flight velocity), increasing susceptibility to the change of trophic environments (Giery & Layman, 2019). Even in species with shallowly forked tails, the Pacific swallow H. tahitica , individuals with longer tails suffer from poor physiological conditions and reduced survivorship during severe weather conditions (e.g., Hasegawa & Arai, 2017, 2019). Such a foraging cost results in a fecundity cost due to a reduced provisioning rate of profitable preys during the breeding season (e.g., Cuervo & Møller, 2006; Matyjasiak et al., 1999).…”

Section: Discussionmentioning

confidence: 99%

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Opposing population trends of fork‐tailed swallows and reddish‐coloured swallows in our changing world

Hasegawa

Arai

2020

J of Evolutionary Biology

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Sexual selection can in theory lead to positive and negative effect on population‐level fitness and hence population increase/decline in our changing world, but the empirical evidence is scarce. Using a phylogenetic comparative approach, we examined whether and how different sexually selected ornaments affect recent population trends and extinction risk in swallows (Aves: Hirundininae). We found that population trends decreased with increasing depth of male tails, that is a well‐known sexually selected trait, and increased with increasing score of reddish plumage coloration, another sexually selected ornament. Similar contrasting patterns were observed for extinction risk. These findings indicate ornament‐specific population trends and extinction risk, perhaps due to the differential costs and benefits of ornamentation. Previous studies have mostly focused on the overall effects of sexual selection by combining different kinds of traits, presumed to be sexually selected. However, as predicted by theory, sexual selection would not be a process with the same universal effect on population dynamics as we found here. Divergent ecological consequences would occur through minor differences in sexual selection, which should not be dismissed in future studies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Opposing population trends of fork‐tailed swallows and reddish‐coloured swallows in our changing world

Hasegawa

Arai

2020

J of Evolutionary Biology

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Swallows nesting on buildings showed positive population trends except when having deeply forked tails

Hasegawa

Arai

2021

J Ornithol

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Male plumage signal expression is related to feather corticosterone concentration in the Pied Flycatcher Ficedula hypoleuca

Moreno

López‐Arrabé

2022

J Ornithol

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Male signals may express the capacity to sustain environmental challenges. In some migratory birds like the Pied Flycatcher Ficedula hypoleuca, plumage ornaments are molted in the winter quarters shortly before spring migration while most feathers are replaced shortly after the breeding season in the breeding areas. The concentration of corticosterone in feathers (CORTf) may relate to baseline CORT levels at the time of molt which could be expressed through plumage signals. Male Pied Flycatchers present white patches on forehead feathers and tertials which are molted before spring migration and on secondaries and primaries replaced after breeding. They also express a variable degree of melanisation of head and back feathers molted in the wintering areas. All these plumage traits have been previously shown to function in social contests and/or mate attraction. Here we have collected tertials on the two wings and two tail feathers, molted in wintering and breeding areas respectively, of males in a Spanish montane population and analysed CORTf in the laboratory with standard enzyme immunoassays. There is no correlation within individuals between CORTf in the two types of feathers, although levels are similar. The size of the forehead patch is negatively associated with CORTf in tail feathers, mainly in small males, while the blackness of head and back is negatively related to CORTf in tertials, mainly in large males. The size of the wing patch composed of patches on feathers molted both in wintering (tertials) and breeding areas (primaries and secondaries) is not related to CORTf in any type of feather. Different male plumage traits thus may reflect circulating CORT levels during molt processes occurring in the wintering respectively breeding range as expressed by CORTf in different types of feathers.

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Evolution of short tails and breakdown of honest signaling system during a severe winter in the Pacific swallow Hirundo tahitica

Cited by 7 publications

References 45 publications

Opposing population trends of fork‐tailed swallows and reddish‐coloured swallows in our changing world

Opposing population trends of fork‐tailed swallows and reddish‐coloured swallows in our changing world

Swallows nesting on buildings showed positive population trends except when having deeply forked tails

Male plumage signal expression is related to feather corticosterone concentration in the Pied Flycatcher Ficedula hypoleuca

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