Scaling patterns of body plans differ among squirrel ecotypes.

Autor:	Linden TJ; University of Washington, Seattle, WA, United States of America., Burtner AE; University of Washington, Seattle, WA, United States of America., Rickman J; University of Washington, Seattle, WA, United States of America., McFeely A; University of Washington, Seattle, WA, United States of America., Santana SE; University of Washington, Seattle, WA, United States of America., Law CJ; University of Washington, Seattle, WA, United States of America.; University of Texas at Austin, Austin, TX, United States of America.; American Museum of Natural History, New York, NY, United States of America.
Jazyk:	angličtina
Zdroj:	PeerJ [PeerJ] 2023 Jan 25; Vol. 11, pp. e14800. Date of Electronic Publication: 2023 Jan 25 (Print Publication: 2023).
DOI:	10.7717/peerj.14800
Abstrakt:	Body size is often hypothesized to facilitate or constrain morphological diversity in the cranial, appendicular, and axial skeletons. However, how overall body shape scales with body size ( i.e. , body shape allometry) and whether these scaling patterns differ between ecological groups remains poorly investigated. Here, we test whether and how the relationships between body shape, body size, and limb lengths differ among species with different locomotor specializations, and describe the underlying morphological components that contribute to body shape evolution among squirrel (Sciuridae) ecotypes. We quantified the body size and shape of 87 squirrel species from osteological specimens held at museum collections. Using phylogenetic comparative methods, we first found that body shape and its underlying morphological components scale allometrically with body size, but these allometric patterns differ among squirrel ecotypes: chipmunks and gliding squirrels exhibited more elongate bodies with increasing body sizes whereas ground squirrels exhibited more robust bodies with increasing body size. Second, we found that only ground squirrels exhibit a relationship between forelimb length and body shape, where more elongate species exhibit relatively shorter forelimbs. Third, we found that the relative length of the ribs and elongation or shortening of the thoracic region contributes the most to body shape evolution across squirrels. Overall, our work contributes to the growing understanding of mammalian body shape evolution and how it is influenced by body size and locomotor ecology, in this case from robust subterranean to gracile gliding squirrels. Competing Interests: The authors declare there are no competing interests. (©2023 Linden et al.)
Databáze:	MEDLINE
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