Postmetamorphic ontogenetic allometry and the evolution of skull shape in Nest-building frogs Leptodactylus (Anura: Leptodactylidae).

Autor: Duport-Bru AS; Unidad Ejecutora Lillo, (CONICET-Fundación Miguel Lillo), Tucumán, Argentina., Ponssa ML; Unidad Ejecutora Lillo, (CONICET-Fundación Miguel Lillo), Tucumán, Argentina., Vera Candioti F; Unidad Ejecutora Lillo, (CONICET-Fundación Miguel Lillo), Tucumán, Argentina.
Jazyk: angličtina
Zdroj: Evolution & development [Evol Dev] 2019 Sep; Vol. 21 (5), pp. 265-277. Date of Electronic Publication: 2019 Jul 29.
DOI: 10.1111/ede.12303
Abstrakt: Allometry constitutes an important source of morphological variation. However, its influence in head development in anurans has been poorly explored. By using geometric morphometrics followed by statistical and comparative methods we analyzed patterns of allometric change during cranial postmetamorphic ontogeny in species of Nest-building frogs Leptodactylus (Leptodactylidae). We found that the anuran skull is not a static structure, and allometry plays an important role in defining its shape in this group. Similar to other groups with biphasic life-cycle, and following a general trend in vertebrates, ontogenetic changes mostly involve rearrangement in rostral, otoccipital, and suspensorium regions. Ontogenetic transformations are paralleled by shape changes associated with evolutionary change in size, such that the skulls of species of different intrageneric groups are scaled to each other, and small and large species show patterns of paedomorphic/peramorphic features, respectively. Allometric trajectories producing those phenotypes are highly evolvable though, with shape change direction and magnitude varying widely among clades, and irrespective of changes in absolute body size. These results reinforce the importance of large-scale comparisons of growth patterns to understand the plasticity, evolution, and polarity of morphological changes in different clades.
(© 2019 Wiley Periodicals, Inc.)
Databáze: MEDLINE
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