Allometric escape from acoustic constraints is rare for frog calls
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2020
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Allometric constraint is a product of natural selection and physical laws, particularly
with respect to body size and traits constrained by properties thereof, such as
metabolism, longevity, and vocal frequency. Allometric relationships are often conserved
across lineages, indicating that physical constraints dictate scaling patterns in
deep time, despite substantial genetic and ecological divergence among organisms.
In particular, acoustic allometry (sound frequency ~ body size) is conserved across
frogs, in defiance of massive variation in both body size and frequency. Here, we ask
how many instances of allometric escape have occurred across the frog tree of life
using a Bayesian framework that estimates the location, number, and magnitude of
shifts in the adaptive landscape of acoustic allometry. Moreover, we test whether
ecology in terms of calling site could affect these relationships. We find that calling
site has a major influence on acoustic allometry. Despite this, we identify only
four major instances of allometric escape, potentially deriving from ecomorphological
adaptations to new signal modalities. In these instances of allometric escape, the
optima and strength of the scaling relationship are different than expected for most
other frog species, representing new adaptive regimes of body size ~ call frequency.
Allometric constraints on frog calls are highly conserved and have rarely allowed
escape, despite frequent invasions of new adaptive regimes and dramatic ecomorphological
divergence. Our results highlight the rare instances in which natural and
sexual selection combined can overcome physical constraints on sound production.
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Adaptive evolution, Phylogenetic comparative methods, Advertisement call, Anurans, Evolution
Citação
TONINI, João Filipe Riva; PROVETE, Diogo B.; MACIEL, Natan M.; MORAIS, Alessandro Ribeiro; GOUTTE, Sandra; TOLEDO, Luís Felipe; PYRON, Robert Alexander. Allometric escape from acoustic constraints is rare for frog calls. Ecology and Evolution, Hoboken, v. 10, n. 8, p. 3686-3695, 2020. DOI: 10.1002/ece3.6155, Disponível em: https://onlinelibrary.wiley.com/doi/epdf/10.1002/ece3.6155. Acesso em: 3 fev. 2023.