NDLI: The community-level effect of light on germination timing in relation to seed mass: a source of regeneration niche differentiation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhang, Chunhui Willis, Charles G. Burghardt, Liana T. Qi, Wei Liu, Kun Souza-Filho, Paulo Roberto de Moura Ma, Zhen Du, Guozhen
Spatial Coverage	Tibet
Description	Country affiliation: China Author Affiliation: Zhang C ( State Key Laboratory of Grassland Agro-ecosystems, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China)
Abstract	Within a community, species may germinate at different times so as to mitigate competition and to take advantage of different aspects of the seasonal environment (temporal niche differentiation). We illustrated a hypothesis of the combined effects of abiotic and biotic competitive factors on germination timing and the subsequent upscale effects on community assembly. We estimated the germination timing (GT) for 476 angiosperm species of the eastern Tibetan Plateau grasslands under two light treatments in the field: high (i.e. natural) light and low light. We also measured the shift in germination timing (SGT) across treatments for all species. Furthermore, we used phylogenetic comparative methods to test if GT and SGT were associated with seed mass, an important factor in competitive interactions. We found a significant positive correlation between GT and seed mass in both light treatments. Additionally, small seeds (early germinating seeds) tended to germinate later and large seeds (late germinating seeds) tended to germinate earlier under low light vs high light conditions. Low light availability can reduce temporal niche differentiation by increasing the overlap in germination time between small and large seeds. In turn, reduced temporal niche differentiation may increase competition in the process of community assembly.
File Format	HTM / HTML
ISSN	0028646X
Issue Number	3
Volume Number	204
e-ISSN	14698137
Journal	New Phytologist
Language	English
Publisher	Wiley
Publisher Date	2014-11-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany Ecosystem Germination Physiology Light Phylogeny Plants Genetics Seeds Plant Development Classification Tibet Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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