Scaling patterns of cerebellar petrosal lobules in Euarchontoglires: Impacts of ecology and phylogeny.

Autor: Lang MM; Department of Anthropology, University of Toronto Scarborough, Toronto, Ontario, Canada., Bertrand OC; School of GeoSciences, University of Edinburgh, Grant Institute, Edinburgh, Scotland, UK., San Martin-Flores G; Flinders University, College of Science and Engineering, Bedford Park, South Australia, Australia., Law CJ; Richard Gilder Graduate School, Department of Mammalogy, and Division of Paleontology, American Museum of Natural History, New York, New York, USA.; Department of Biology, University of Washington, Seattle, Washington, USA.; Department of Integrative Biology, The University of Texas at Austin, Austin, Texas, USA., Abdul-Sater J; Department of Anthropology, University of Toronto Scarborough, Toronto, Ontario, Canada., Spakowski S; Department of Anthropology, University of Toronto Scarborough, Toronto, Ontario, Canada., Silcox MT; Department of Anthropology, University of Toronto Scarborough, Toronto, Ontario, Canada.
Jazyk: angličtina
Zdroj: Anatomical record (Hoboken, N.J. : 2007) [Anat Rec (Hoboken)] 2022 Dec; Vol. 305 (12), pp. 3472-3503. Date of Electronic Publication: 2022 Apr 28.
DOI: 10.1002/ar.24929
Abstrakt: The petrosal lobules (in whole or part homologous with the paraflocculi) of the cerebellum regulate functions associated with vision including smooth pursuit and velocity control of eye movements, suggesting a possible relationship between the petrosal lobules and behavioral adaptation. Previous studies have produced diverging conclusions regarding the lobules' ecological signal. The current study examines lobule scaling within an ecologically diverse but phylogenetically constrained sample of extant mammals to determine whether ecology influences relative petrosal lobule size. Using the endocasts of 140 Euarchontoglires (Primates, Scandentia, Dermoptera, Lagomorpha, Rodentia), petrosal lobule size was evaluated relative to endocranium and body size, accounting for phylogenetic relationships and ecology (locomotor behavior, diet, activity pattern). Results show a strong positive relationship between lobule size and both endocranial volume and body mass. Phylogeny is a major factor in the scaling of the petrosal lobules, with significant differences in relative size identified between orders and suborders. Concerning ecology, fossorial taxa were found to have significantly smaller petrosal lobules relative to body mass compared to other locomotor groups across Euarchontoglires. The small lobules possessed by this group may reflect an adaptation related to reduced visual reliance. In contrast to previous research, no relationship was identified between relative lobule size and any other ecological variables. While variation in relative lobule size may be adaptively significant in some groups (i.e., fossorial species), it is critical to study the evolution of petrosal lobule size within a narrow phylogenetic scope, with inclusion of fossil material to inform our understanding of evolutionary trajectories.
(© 2022 American Association for Anatomy.)
Databáze: MEDLINE
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