The allometry of brain size in Euarchontoglires : clade-specific patterns and their impact on encephalization quotients
López-Torres, Sergi (University of Warsaw. Biological and Chemical Research Centre)
Bertrand, Ornella C. (Institut Català de Paleontologia Miquel Crusafont)
Fostowicz-Frelik, Łucja (Chinese Academy of Sciences. Institute of Vertebrate Paleontology and Paleoanthropology)
Lang, Madlen M. (University of Toronto Scarborough. Department of Anthropology)
Law, Chris J. (University of Texas. Department of Integrative Biology)
San Martin-Flores, Gabriela (University of Toronto Scarborough. Department of Anthropology)
Schillaci, Michael A. (University of Toronto Scarborough. Department of Anthropology)
Silcox, Mary T. (University of Toronto Scarborough. Department of Anthropology)

Date:	2024
Abstract:	The timing and nature of evolutionary shifts in the relative brain size of Primates have been extensively studied. Less is known, however, about the scaling of the brain-to-body size in their closest living relatives, i. e. , among other members of Euarchontoglires (Dermoptera, Scandentia, Lagomorpha, Rodentia). Ordinary least squares (OLS), reduced major axis (RMA), and phylogenetic generalized least squares (PGLS) regressions were fitted to the largest euarchontogliran data set of brain and body mass, comprising 715 species. Contrary to previous inferences, lagomorph brain sizes (PGLS slope = 0. 465; OLS slope = 0. 593) scale relative to body mass similarly to rodents (PGLS = 0. 526; OLS = 0. 638), and differently than primates (PGLS = 0. 607; OLS = 0. 794). There is a shift in the pattern of the scaling of the brain in Primates, with Strepsirrhini occupying an intermediate stage similar to Scandentia but different from Rodentia and Lagomorpha, while Haplorhini differ from all other groups in the OLS and RMA analyses. The unique brain-body scaling relationship of Primates among Euarchontoglires illustrates the need for clade-specific metrics for relative brain size (i. e. , encephalization quotients; EQs) for more restricted taxonomic entities than Mammalia. We created clade-specific regular and phylogenetically adjusted EQ equations at superordinal, ordinal, and subordinal levels. When using fossils as test cases, our results show that generalized mammalian equations underestimate the encephalization of the stem lagomorph Megalagus turgidus in the context of lagomorphs, overestimate the encephalization of the stem primate Microsyops annectens and the early euprimate Necrolemur antiquus, but provide similar EQ values as our new strepsirrhine-specific EQ when applied to the early euprimate Adapis parisiensis.
Grants:	European Commission 792611 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/BP-00042
Note:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Biological scaling ; Body size ; Brain size ; Comparative anatomy ; Endocasts ; Neurobiology
Published in:	Journal of Mammalogy, Vol. 105, Issue 6 (December 2024) , p. 1430-1445, ISSN 1545-1542

DOI: 10.1093/jmammal/gyae084
PMID: 39588191

16 p, 37.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut Català de Paleontologia Miquel Crusafont (ICP)
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