Adaptation in brain structure and respiratory and olfactory structures across environmental gradients in African and North American muroid rodents  

作　　者：Peter J.TAYLOR Aluwani NENGOVHELA Christiane DENYS Graham R.SCOTT Catherine M.IVY 

机构地区：[1]Department of Zoology,School of Natural and Mathematical Sciences,University of Venda,Thohoyandou,South Africa [2]Afromontane Unit,Department of Zoology and Entomology,University of the Free State,Phuthaditjhaba,South Africa [3]Department of Mammalogy,National Museum,Bloemfontein,South Africa [4]Institut de Systématique,Evolution,Biodiversité(ISYEB),Muséum National d’Histoire Naturelle,CNRS,Sorbonne Université,EPHE,UniversitéDes Antilles,Paris,France [5]Department of Biology,McMaster University,Hamilton,Ontario,Canada [6]Guglielmo and Shoemaker Labs,Advanced Facility for Avian Research,University of Western Ontario,London,Ontario,Canada

出　　处：《Integrative Zoology》2024年第1期165-181,共17页整合动物学（英文版）

摘　　要：Morphometric studies of 3D micro CT-scanned images can provide insights into the evolution of the brain and sensory structures but such data are still scarce for the most diverse mammalian order of rodents.From reviewed and new data,we tested for convergence to extreme aridity and high elevation in the sensory and brain morphology of rodents,from morphometric data from micro-CT X-ray scans of 174 crania of 16 species of three distantly re-lated African murid(soft-furred mice,Praomyini,laminate-toothed rats,Otomyini,and gerbils,Gerbillinae)clades and one North American cricetid(deer mice and white-footed mice,Peromyscus)clade.Recent studies demon-strated convergent evolution acting on the oval window area of the cochlea(enlarged in extremely arid-adapted species of Otomyini and Gerbillinae)and on endocranial volume(reduced in high elevation taxa of Otomyini and Peromyscus).However,contrary to our predictions,we did notfind evidence of convergence in brain struc-ture to aridity,or in the olfactory/respiratory system(turbinate bones)to high elevation.Brain structure differed,particularly in the petrosal lobules of the cerebellum and the olfactory bulbs,between Otomyini and Gerbillinae,with extreme arid-adapted species in each clade being highly divergent(not convergent)from other species in the same clade.We observed greater“packing”of the maxillary turbinate bones,which have important respiratory functions,in Peromyscus mice from high and low elevations compared to the high-elevation African Praomyini,but more complex patterns within Peromyscus,probably related to trade-offs in respiratory physiology and heat exchange in the nasal epithelium associated with high-elevation adaptation.

关 键 词：3D morphometrics Africa brain size North America RODENTIA sensory evolution 

分 类 号：Q95[生物学—动物学]