干旱区生态环境知识资源中心(Arid): Variation in brain volume in nine populations and three taxa of the African striped mouse Rhabdomys

Arid

DOI	10.1002/jmor.21463
	Variation in brain volume in nine populations and three taxa of the African striped mouse Rhabdomys
	Neves, Candice Nikita; Pillay, Neville
通讯作者	Neves, CN (corresponding author)，Univ Witwatersrand, Sch Anim Plant & Environm Sci, ZA-2050 Johannesburg, South Africa.
来源期刊	JOURNAL OF MORPHOLOGY
ISSN	0362-2525
EISSN	1097-4687
出版年	2022-02
英文摘要	Brain size can vary between populations in different environments because of different selection pressures on behaviours, such as learning and memory, related to spatial, social and environmental differences. We investigated the variation in total and broad-scale regional brain size in the murid rodent genus Rhabdomys from different environments. We assessed taxon-, population- and sex-level differences in total and regional brain volume in three populations each of three taxa (arid-occurring Rhabdomys pumilio and mesic-occurring Rhabdomys dilectus chakae and R. d. dilectus) originating across southern Africa. We mu CT-scanned crania obtained from museums in South Africa and used digital software to create endocasts and extract total endocranium and regional volumes: olfactory bulb, anterior cerebrum, posterior cerebrum, cerebellum volume and petrosal volume. Total endocranial volume scaled with basal skull length and all-region volumes scaled with total endocranial volume. We found taxon-, and population-level differences in total endocranial volume. Relative anterior and posterior cerebrum volume did not differ significantly between taxa or populations, but relative cerebellum volume was larger in arid populations than mesic populations. Relative olfactory bulb volume was larger in mesic R. dilectus than in the R. pumilio, but petrosal lobule volume was larger in R. pumilio populations than in R. dilectus. Males had larger total endocranial volumes than females. Drivers of larger total endocranial volumes in R. pumilio are not immediately clear from our results. Environmental seasonality of food availability, cognitive buffering and locomotion may all correlate with total endocranial volume size, whereas the influence of sociality cannot be excluded. The environment and degree of semi-arboreality are likely driving variation in cerebellum, olfactory bulb and petrosal lobule volumes.
英文关键词	brain endocast environment locomotion sexual dimorphism
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000760285700001
WOS关键词	SOCIAL-ORGANIZATION ; SPATIAL-BEHAVIOR ; SEX-DIFFERENCES ; SOUTH-AFRICA ; SPACE-USE ; SIZE ; EVOLUTION ; HIPPOCAMPUS ; PUMILIO ; COMPLEXITY
WOS类目	Anatomy & Morphology
WOS研究方向	Anatomy & Morphology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377232
作者单位	[Neves, Candice Nikita; Pillay, Neville] Univ Witwatersrand, Sch Anim Plant & Environm Sci, ZA-2050 Johannesburg, South Africa
推荐引用方式 GB/T 7714	Neves, Candice Nikita,Pillay, Neville. Variation in brain volume in nine populations and three taxa of the African striped mouse Rhabdomys[J],2022.
APA	Neves, Candice Nikita,&Pillay, Neville.(2022).Variation in brain volume in nine populations and three taxa of the African striped mouse Rhabdomys.JOURNAL OF MORPHOLOGY.
MLA	Neves, Candice Nikita,et al."Variation in brain volume in nine populations and three taxa of the African striped mouse Rhabdomys".JOURNAL OF MORPHOLOGY (2022).