干旱区生态环境知识资源中心(Arid): Ecophysiological strategy switch through development in heteroblastic species of mediterranean ecosystems

Arid

DOI	10.1093/aob/mcy194
	Ecophysiological strategy switch through development in heteroblastic species of mediterranean ecosystems - an example in the African Restionaceae
	Ehmig, Merten; Coiro, Mario; Linder, H. Peter
通讯作者	Ehmig, Merten
来源期刊	ANNALS OF BOTANY
ISSN	0305-7364
EISSN	1095-8290
出版年	2019
卷号	123 期号:4 页码:611-623
英文摘要	Background and Aims Heteroblasty is a non-reversible morphological change associated with life stage change and has been linked to predictable environmental variation. It is present in several clades from mediterranean-type climates, such as African Restionaceae (restios). These have heteroblastic shoots: juvenile shoots are thin, branched and sterile (sterile shoots); adult shoots are thicker and less branched, and bear inflorescences (reproductive shoots). Ten per cent of the restios retain juvenile-like, sterile shoots as adults (neoteny). We hypothesize (1) that the two shoot types differ in ecophysiological attributes, and (2) that these shoot types (and the neoteny) are associated with different environments. Methods We measured shoot mass per surface area (SMA), maximum photosynthetic capacity per biomass (A(mass)) and chlorenchyma to ground tissue ratio (CGR) of both shoot types in 14 restio species. We also calculated environmental niche overlap between neotenous and non-neotenous species using an improved multidimensional overlap function based on occurrence data, and linked shoot types with environments using a phylogenetic generalized linear model. Key Results Sterile shoots showed higher A(mass), lower SMA and higher CGR than reproductive shoots. Neotenous and non-neotenous species overlapped ecologically less than expected by chance: neotenous species favoured more mesic, non-seasonal conditions. Conclusions We associate sterile shoot morphology with acquisitive ecophysiological strategies and reproductive shoots with conservative strategies. The heteroblastic switch optimizes carbon efficiency in the juvenile phase (by sterile shoots) in the mesic post-fire conditions. The adult shoots present a compromise between a more conservative strategy favourable under harsher conditions and reproductive success. Heteroblasty in seasonally arid, oligotrophic ecosystems with predictable, fire-driven shifts in water and nutrient availability might play a role in the success of restios and other species-rich lineages in mediterranean-type ecosystems. It may represent a previously unrecognized adaptation in mediterranean clades sharing similar conditions, contributing to their ecological and taxonomic dominance.
英文关键词	Cape flora dimorphism diversity hotspot fire disturbance heterophylly leaf economics spectrum mediterranean ecosystem multidimensional niche overlap photosynthesis trait-environment relationship Restionaceae
类型	Article
语种	英语
国家	Switzerland
开放获取类型	Green Published, Green Accepted, Bronze
收录类别	SCI-E
WOS记录号	WOS:000462548800005
WOS关键词	ECONOMICS SPECTRUM ; WATER RELATIONS ; EVOLUTION ; PHOTOSYNTHESIS ; FYNBOS ; PLANTS ; GERMINATION ; NITROGEN ; JUVENILE ; ECOLOGY
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214187
作者单位	Univ Zurich, Dept Systemat & Evolutionary Bot, Zollikerstr 107, CH-8008 Zurich, Switzerland
推荐引用方式 GB/T 7714	Ehmig, Merten,Coiro, Mario,Linder, H. Peter. Ecophysiological strategy switch through development in heteroblastic species of mediterranean ecosystems - an example in the African Restionaceae[J],2019,123(4):611-623.
APA	Ehmig, Merten,Coiro, Mario,&Linder, H. Peter.(2019).Ecophysiological strategy switch through development in heteroblastic species of mediterranean ecosystems - an example in the African Restionaceae.ANNALS OF BOTANY,123(4),611-623.
MLA	Ehmig, Merten,et al."Ecophysiological strategy switch through development in heteroblastic species of mediterranean ecosystems - an example in the African Restionaceae".ANNALS OF BOTANY 123.4(2019):611-623.