Bird Migration in South America: The Fork-tailed Flycatcher (Tyrannus savana) as a Case Study

Tuero, Diego T.; Jahn, Alex E.; MacPherson, Maggie

doi:10.1007/978-3-030-14280-3_7

Cited by 8 publications

(13 citation statements)

References 93 publications

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“…Estimates of effective population size of the sedentary lineage (N e 66; 448) were less than half of that of the ancestral migratory lineage (N e 160; 020), also supporting a scenario in which sedentary birds stemmed from a migratory ancestor via a founder event [23]. Given that fork-tailed flycatchers primarily use savanna and woodland habitats [20], (legend continued on next page) warm and dry climatic conditions during periods of the Pleistocene might have promoted the establishment of a founder sedentary population in areas of northern South America that might have resulted from the spread of savannas in tropical South America at that time. Alternatively, dispersal of temperate-breeding populations across the Amazon basin linked to Pleistocene climate change resulting in a savanna corridor might have allowed the establishment of a sedentary breeding population in open areas of northern South America [26,27].…”

Section: Resultsmentioning

confidence: 82%

“…Speciation in Fork-Tailed Flycatchers We tested the hypothesis that an evolutionary switch in migratory behavior promoted speciation in the fork-tailed flycatcher (Tyrannus savana). This common New World bird in the tyrantflycatcher family (Tyrannidae) comprises four subspecies; three of them (monachus, sanctaemartae, and circumdatus) are sedentary in Central America and northern South America, and one (savana) is a long-distance migrant that breeds from central Brazil to Argentina and spends the non-breeding season in northern South America, where it overlaps with the resident subspecies [17][18][19][20] (Figure 1). Subspecies were described on the basis of geographic variation in wing feathers of adult males, which differ in the extent of attenuation of a notch at the tips of the primary feathers (Figure 1) [21], a trait used during social displays to produce non-vocal acoustic signals [22].…”

Section: Resultsmentioning

confidence: 99%

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Speciation Associated with Shifts in Migratory Behavior in an Avian Radiation

et al. 2020

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Speciation Associated with Shifts in Migratory Behavior in an Avian Radiation

et al. 2020

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“…Ongoing sexual selection has been reported in both T. savana and T. forficatus [58,62]. Still, the coupling of sexual dimorphism (a natural by-product of sexual selection [86,87] with allometric shape variation suggests that this powerful agent of evolutionary change is being fed with a pervasive and ecologically significant source of morphological variation.…”

Section: Discussionmentioning

confidence: 99%

“…They prey primarily on flying insects and forage almost exclusively during flight, although they also feed from high perches or on the ground [54][55][56]. The group includes two deepfork-tailed (hereafter, DF) species, the Scissor-tailed (T. forficatus) and the Fork-tailed (T. savana) Flycatchers, from North America and South America, respectively (Figure 1, [51,57,58]).…”

Section: Introductionmentioning

confidence: 99%

“…Derived from independent monophyletic lineages [59], these DF species present disjunct geographic distributions [60] and are characterised as socially monogamous, with both male and female involved in parental care [61]. Both species show extremely elongated tails in males and females, as well as a significant sexual dimorphism in tail length attributed to the action of sexual selection [58,62,63].…”

Section: Introductionmentioning

confidence: 99%

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Allometry, sexual selection, and evolutionary lines of least resistance shaped the evolution of exaggerated sexual traits within the genus Tyrannus

Carmona

Soto

et al. 2021

Preprint

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Variational properties hold a fundamental role in shaping biological evolution, exerting control over the magnitude and direction of evolutionary change elicited by microevolutionary processes that sort variation, such as selection or drift. We studied the Tyrannus genus, as a model for examining the conditions and drivers that facilitate the repeated evolution of exaggerated, secondary sexual traits in the face of significant functional limitations. We study the role of allometry, sexual selection, and their interaction on the diversification of tail morphology in the genus, assessing whether and how they promoted or constrained phenotypic evolution. The exaggerated and functionally-constrained long feathers of deep-forked species, T. savana and T. forficatus, independently diverged from the rest of the genus following the same direction of main interspecific variation common to the entire cluster of species. However, at a macroevolutionary scale those axes summarising both sexual dimorphism and allometric variation of the deep-forked species were aligned with the between-species maximum variation axis of non deep-forked species. Thus, we are presenting evidence of amplified divergence via the co-option and reorientation of allometric shape variation involved in a sexual selection process that repeatedly drove morphology along a historically favoured direction of cladogenetic evolution.

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Sonations in Migratory and Non-migratory Fork-tailed Flycatchers (Tyrannus savana)

Gómez‐Bahamón

Tuero

Castaño

et al. 2020

Integrative and Comparative Biology

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Sonations are sounds that animals produce with structures other than the vocal apparatus for communication. In birds, many sonations are usually produced with modified flight feathers through diverse kinematic mechanisms. For instance, aeroelastic fluttering of feathers produces tonal sound when airflow exceeds a threshold velocity and induces flight feathers to oscillate at a constant frequency. The Fork-tailed Flycatcher (Tyrannus savana) is a Neotropical bird with both migratory and year-round resident subspecies that differ in the shape of the outer primary feathers of their wings. By integrating behavioral observations, audio recordings and high-speed videos, we find that male Fork-tailed flycatchers produce sonations with their outer primary feathers P8-10, and possibly P7. These sounds are produced during different behavioral contexts including: the pre-dawn display, intraspecific territorial disputes, when attacking potential nest predators, and when escaping. By placing feathers in a wind tunnel, we elicited flutter at frequencies that matched the acoustic signature of sounds recorded in the wild, indicating that the kinematic mechanism responsible for sound production is aeroelastic flutter. Video of wild birds indicated that sonations were produced during the downstroke. Finally, the feathers of migratory (T.s.savana) and year-round resident (T.s.monachus) Fork-tailed flycatchers flutter in feather locations that differ in shape between the subspecies, and these shape differences between the subspecies result in sounds produced at different frequencies.

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Bird Migration in South America: The Fork-tailed Flycatcher (Tyrannus savana) as a Case Study

Cited by 8 publications

References 93 publications

Speciation Associated with Shifts in Migratory Behavior in an Avian Radiation

Speciation Associated with Shifts in Migratory Behavior in an Avian Radiation

Allometry, sexual selection, and evolutionary lines of least resistance shaped the evolution of exaggerated sexual traits within the genus Tyrannus

Sonations in Migratory and Non-migratory Fork-tailed Flycatchers (Tyrannus savana)

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