Calling in gray treefrog choruses: modifications and mysteries

Bee, Mark A.; Schwartz, Joshua J.

doi:10.1121/1.4799224

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…In terms of female preferences, there is mixed evidence that call duration predominates over call rate in female decisions (Gerhardt et al 1996; Ward et al 2013), and preference strength for either characteristic weakens as its magnitude increases, which should weaken selection towards either extreme of the trade-off axis (Tanner et al 2017). There may be other advantages for males to resolve the trade-off by producing longer calls at lower rates, for instance if longer calls could stand out better against the background noise of the chorus, although evidence for such a benefit is limited (Bee and Schwartz 2013).…”

Section: Discussionmentioning

confidence: 99%

Partitioning variance in a signaling trade-off under sexual selection reveals among-individual covariance in trait allocation

Reichert

Hera

Moiron

2022

Preprint

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Understanding the evolution of traits subject to trade-offs is challenging because phenotypes can (co)vary at both the among- and within-individual levels. Among-individual covariation indicates consistent, possibly genetic, differences in how individuals resolve the trade-off, while within-individual covariation indicates trait plasticity. There is also the potential for consistent among-individual differences in behavioral plasticity, although this has rarely been investigated. We studied the sources of (co)variance in two characteristics of an acoustic advertisement signal that trade off with one another and are under sexual selection in the gray treefrog, Hyla chrysoscelis: call duration and call rate. We recorded males on multiple nights calling spontaneously and in response to playbacks simulating different competition levels. Call duration, call rate, and their product, call effort, were all repeatable within nights, but only call duration was repeatable across nights. Call duration and call rate covaried negatively, and the largest covariance was at the among-individual level. There was extensive plasticity in calling both within and across nights, but no evidence that the plastic response to competition was repeatable. The significant negative among-individual covariance in trait values is perpendicular to the primary direction of sexual selection in this species, indicating potential limits on the response to selection.

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Section: Discussionmentioning

confidence: 99%

Partitioning variance in a signaling trade-off under sexual selection reveals among-individual covariance in trait allocation

Reichert

Hera

Moiron

2022

Preprint

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“…However, this hypothesis should be properly tested because despite the fact that it is theoretical appealing, there is no conclusive empirical support. Current evidence in the calling strategies of Hyla chrysoscelis suggests that males do not necessarily profit significantly from producing longer calls at slower rates in terms of increasing their overall attractiveness to females, overcoming interference by overlapping calls, or increasing the detection of their calls in conspecific noise (Bee & Schwartz ). Despite the robust and directional nature of the call modifications observed in several species, the authors concluded that the evolutionary function of these modifications remains unclear in most of them.…”

Section: Discussionmentioning

confidence: 99%

Complex Vocal Responses to Conspecific Calls in Whistling Frogs Eleutherodactylus johnstonei: Playback Experiments in the Field

Tárano

Fuenmayor

2014

Ethology

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We simulated the presence of an acoustic competitor by broadcasting conspecific playbacks to males of Johnstone's whistling frog, Eleutherodactylus johnstonei, in the field. We broadcast calls that differed in duration (short, typical, and long), dominant frequency (high, typical, and low), and period (short, typical, and long), and analyzed male vocal responses. We tested the hypothesis that males respond by escalating vocally when they are exposed to female‐attractive calls and by ignoring unattractive ones. At the population level, males responded to playbacks in ways that would potentially increase their attractiveness with regard to solo calling: males increased the duration, reduced the dominant frequency, and increased their calling effort (duty cycle), despite an increase in call period. The modification of call duration occurred only in response to playbacks of low‐frequency calls, long calls, and short‐period calls (selective response), while the modification of the dominant frequency was independent of the characteristic of the playback (fixed response). Contrary to the expected, males did not reduce the call period when they were exposed to attractive playbacks. At the ultimate level, the results suggest energy‐saving strategies. In addition, males seem to trade off call period for the avoidance of acoustic interference with attractive calls as calling effort was typically increased by increasing call duration but only rarely by reducing the call period. Interactive playbacks are necessary to better understand the calling strategies of males of E. johnstonei.

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Partitioning variance in a signaling trade-off under sexual selection reveals among-individual covariance in trait allocation

Reichert,

de la Hera,

Moiron

2024

Evolution

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Understanding the evolution of traits subject to trade-offs is challenging because phenotypes can (co)vary at both the among- and within-individual levels. Among-individual covariation indicates consistent, possibly genetic, differences in how individuals resolve the trade-off, while within-individual covariation indicates trait plasticity. There is also the potential for consistent among-individual differences in behavioral plasticity, although this has rarely been investigated. We studied the sources of (co)variance in two characteristics of an acoustic advertisement signal that trade off with one another and are under sexual selection in the gray treefrog, Hyla chrysoscelis: call duration and call rate. We recorded males on multiple nights calling spontaneously and in response to playbacks simulating different competition levels. Call duration, call rate, and their product, call effort, were all repeatable both within and across social contexts. Call duration and call rate covaried negatively, and the largest covariance was at the among-individual level. There was extensive plasticity in calling with changes in social competition, and we found some evidence for among-individual variance in call rate plasticity. The significant negative among-individual covariance in trait values is perpendicular to the primary direction of sexual selection in this species, indicating potential limits on the response to selection.

show abstract

Calling in gray treefrog choruses: modifications and mysteries

Cited by 3 publications

References 34 publications

Partitioning variance in a signaling trade-off under sexual selection reveals among-individual covariance in trait allocation

Partitioning variance in a signaling trade-off under sexual selection reveals among-individual covariance in trait allocation

Complex Vocal Responses to Conspecific Calls in Whistling Frogs Eleutherodactylus johnstonei: Playback Experiments in the Field

Partitioning variance in a signaling trade-off under sexual selection reveals among-individual covariance in trait allocation

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