Anatomy and ontogenetic changes of the facial and gular musculature of the tetra <i>Astyanax brucutu</i>: A remarkable case of adaptation to durophagy

Vita, George; Zanata, Angela M.; Datovo, Aléssio

doi:10.1111/joa.13280

Cited by 5 publications

(1 citation statement)

References 42 publications

(79 reference statements)

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“…This pattern of increased size and development of the jaw muscles and associated structures in comparison to the similarly sized Ch. mydas (Pritchard and Trebbau 1984) is consistent with "acceleration" peramorphosis (Klingenberg 1998), as seen in multiple other vertebrate groups (Denoel et al 2004;Herrel and O'Reilly 2006;Chemisquy 2015;Vita et al 2020). Within turtles, this phenotype (with large adductor chambers and deep jaws) is also consistently associated with durophagy among unrelated species such as Malayemys subtrijuga and Sternotherus odoratus (Claude et al 2004;Bever 2009;Parham and Pyenson 2010;Ferreira et al 2015;Lunardon et al 2020).…”

Section: Discussionmentioning

confidence: 64%

Ontogenetic allometry underlies trophic diversity in sea turtles (Chelonioidea)

et al. 2022

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Despite only comprising seven species, extant sea turtles (Cheloniidae and Dermochelyidae) display great ecological diversity, with most species inhabiting a unique dietary niche as adults. This adult diversity is remarkable given that all species share the same dietary niche as juveniles. These ontogenetic shifts in diet, as well as a dramatic increase in body size, make sea turtles an excellent group to examine how morphological diversity arises by allometric processes and life habit specialisation. Using three-dimensional geometric morphometrics, we characterise ontogenetic allometry in the skulls of all seven species and evaluate variation in the context of phylogenetic history and diet. Among the sample, the olive ridley (Lepidochelys olivacea) has a seemingly average sea turtle skull shape and generalised diet, whereas the green (Chelonia mydas) and hawksbill (Eretmochelys imbricata) show different extremes of snout shape associated with their modes of food gathering (grazing vs. grasping, respectively). Our ontogenetic findings corroborate previous suggestions that the skull of the leatherback (Dermochelys coriacea) is paedomorphic, having similar skull proportions to hatchlings of other sea turtle species and retaining a hatchling-like diet of relatively soft bodied organisms. The flatback sea turtle (Natator depressus) shows a similar but less extreme pattern. By contrast, the loggerhead sea turtle (Caretta caretta) shows a peramorphic signal associated with increased jaw muscle volumes that allow predation on hard shelled prey. The Kemp’s ridley (Lepidochelys kempii) has a peramorphic skull shape compared to its sister species the olive ridley, and a diet that includes harder prey items such as crabs. We suggest that diet may be a significant factor in driving skull shape differences among species. Although the small number of species limits statistical power, differences among skull shape, size, and diet are consistent with the hypothesis that shifts in allometric trajectory facilitated diversification in skull shape as observed in an increasing number of vertebrate groups.

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Section: Discussionmentioning

confidence: 64%

Ontogenetic allometry underlies trophic diversity in sea turtles (Chelonioidea)

et al. 2022

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Anatomy and ontogenetic changes of the facial and gular musculature of the tetra Astyanax brucutu: A remarkable case of adaptation to durophagy

2020

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Characiformes is one of the most diverse orders of freshwater fishes, with 24 families that include 2,261 valid species, 316 of which were described in the past decade (Fricke et al., 2020a). The growing number of newly discovered species of characiforms provides a series of new morphological data that represent an important source of systematic and ecological information. Nevertheless, some morphological systems of characiforms remain poorly understood, such as the skeletal musculature (Datovo & Castro, 2012). Most surveys involving the characiform myology include only a limited number of structures and taxa investigated (e.g., Alexander,

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Muscle Complexes in the Jaw Apparatus of Teleost Fishes: Structure and Function

Gromova

Махотин

2023

Russ J Mar Biol

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Anatomy and ontogenetic changes of the facial and gular musculature of the tetra Astyanax brucutu: A remarkable case of adaptation to durophagy

Cited by 5 publications

References 42 publications

Ontogenetic allometry underlies trophic diversity in sea turtles (Chelonioidea)

Ontogenetic allometry underlies trophic diversity in sea turtles (Chelonioidea)

Anatomy and ontogenetic changes of the facial and gular musculature of the tetra Astyanax brucutu: A remarkable case of adaptation to durophagy

Muscle Complexes in the Jaw Apparatus of Teleost Fishes: Structure and Function

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