Untangling interacting mechanisms of seed mass variation with elevation: insights from the comparison of inter-specific and intra-specific studies on eastern Tibetan angiosperm species

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	Untangling interacting mechanisms of seed mass variation with elevation: insights from the comparison of inter-specific and intra-specific studies on eastern Tibetan angiosperm species
	Qi, W; Bu, HY; Cornelissen, JHC; Zhang, CH; Guo, SQ; Wang, JH; Zhou, XH; Li, WJ; Du, GZ; Du, GZ (reprint author), Lanzhou Univ, Sch Life Sci, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Peoples R China.
	2015
发表期刊	PLANT ECOLOGY
卷号	216 期号:2 页码:283-292
摘要	With increasing elevation, seed mass is expected to be either larger for its advantage during seedling establishment in stressful high-elevation environments ("stress-tolerance" mechanism) or smaller due to energy constraints. Based on the combination of inter- and intra-specific analyses on 4,023 populations of 320 Tibetan plant species, we found an overall positive within species but negative among species seed mass-elevation relationship, suggesting that regional seed mass distribution with elevation is affected mainly by the energy-constraint mechanism at among-species level, but by the stress-tolerance mechanism at within-species level. Moreover, both intra- and inter-specific analyses revealed a mass-dependent seed mass variation along elevation gradients: small seeds tended to increase but large seeds tended to decrease with increasing elevation, indicating that the stress-tolerance (respectively energy-constraint) mechanism may exert a stronger effect on elevational distribution of small-seeded (respectively large-seeded) populations or species. The mass-dependent seed mass variation along elevation gradients, however, was absent within woody and zoochorous species, implying substantial available resources and long time for seed development, and the covariation or coevolution between the mass of zoochorous seeds and their dispersers may allow for a (partial) decoupling of species' seed mass and their intra-specific variation with elevation. Together our results call for more comparative analyses at different taxonomic levels in detecting geographic variation in a trait.; With increasing elevation, seed mass is expected to be either larger for its advantage during seedling establishment in stressful high-elevation environments ("stress-tolerance" mechanism) or smaller due to energy constraints. Based on the combination of inter- and intra-specific analyses on 4,023 populations of 320 Tibetan plant species, we found an overall positive within species but negative among species seed mass-elevation relationship, suggesting that regional seed mass distribution with elevation is affected mainly by the energy-constraint mechanism at among-species level, but by the stress-tolerance mechanism at within-species level. Moreover, both intra- and inter-specific analyses revealed a mass-dependent seed mass variation along elevation gradients: small seeds tended to increase but large seeds tended to decrease with increasing elevation, indicating that the stress-tolerance (respectively energy-constraint) mechanism may exert a stronger effect on elevational distribution of small-seeded (respectively large-seeded) populations or species. The mass-dependent seed mass variation along elevation gradients, however, was absent within woody and zoochorous species, implying substantial available resources and long time for seed development, and the covariation or coevolution between the mass of zoochorous seeds and their dispersers may allow for a (partial) decoupling of species' seed mass and their intra-specific variation with elevation. Together our results call for more comparative analyses at different taxonomic levels in detecting geographic variation in a trait.
关键词	Energy-constraint Mechanism Life Form Pollination System Seed Dispersal Mode "stress-tolerance" Mechanism Tibetan Plateau
收录类别	SCI
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/5459
专题	中国科学院西北高原生物研究所
通讯作者	Du, GZ (reprint author), Lanzhou Univ, Sch Life Sci, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Peoples R China.
推荐引用方式 GB/T 7714	Qi, W,Bu, HY,Cornelissen, JHC,et al. Untangling interacting mechanisms of seed mass variation with elevation: insights from the comparison of inter-specific and intra-specific studies on eastern Tibetan angiosperm species[J]. PLANT ECOLOGY,2015,216(2):283-292.
APA	Qi, W.,Bu, HY.,Cornelissen, JHC.,Zhang, CH.,Guo, SQ.,...&Du, GZ .(2015).Untangling interacting mechanisms of seed mass variation with elevation: insights from the comparison of inter-specific and intra-specific studies on eastern Tibetan angiosperm species.PLANT ECOLOGY,216(2),283-292.
MLA	Qi, W,et al."Untangling interacting mechanisms of seed mass variation with elevation: insights from the comparison of inter-specific and intra-specific studies on eastern Tibetan angiosperm species".PLANT ECOLOGY 216.2(2015):283-292.

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