DOI: 10.1111/gcb.12037
论文题名: Improving our understanding of environmental controls on the distribution of C3 and C4 grasses
作者: Pau S. ; Edwards E.J. ; Still C.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 1 起始页码: 184
结束页码: 196
语种: 英语
英文关键词: BEP
; Echinochloa
; Land surface temperature
; Niche conservatism
; Oplismenus
; PACMAD
; Temperature crossover model
Scopus关键词: air temperature
; biogeography
; global change
; grass
; land surface
; moisture content
; niche
; photosynthesis
; precipitation (chemistry)
; satellite data
; species diversity
; surface temperature
; taxonomy
; temperature gradient
; article
; classification
; environmental monitoring
; Poaceae
; temperature
; Environmental Monitoring
; Poaceae
; Temperature
; Echinochloa
; Oplismenus
; Poaceae
英文摘要: A number of studies have demonstrated the ecological sorting of C3 and C4 grasses along temperature and moisture gradients. However, previous studies of C3 and C4 grass biogeography have often inadvertently compared species in different and relatively unrelated lineages, which are associated with different environmental settings and distinct adaptive traits. Such confounded comparisons of C3 and C4 grasses may bias our understanding of ecological sorting imposed strictly by photosynthetic pathway. Here, we used MaxEnt species distribution modeling in combination with satellite data to understand the functional diversity of C3 and C4 grasses by comparing both large clades and closely related sister taxa. Similar to previous work, we found that C4 grasses showed a preference for regions with higher temperatures and lower precipitation compared with grasses using the C3 pathway. However, air temperature differences were smaller (2 °C vs. 4 °C) and precipitation and % tree cover differences were larger (1783 mm vs. 755 mm, 21.3% vs. 7.7%, respectively) when comparing C3 and C4 grasses within the same clade vs. comparing all C4 and all C3 grasses (i.e., ignoring phylogenetic structure). These results were due to important differences in the environmental preferences of C3 BEP and PACMAD clades (the two main grass clades). Winter precipitation was found to be more important for understanding the distribution and environmental niche of C3 PACMADs in comparison with both C3 BEPs and C4 taxa, for which temperature was much more important. Results comparing closely related C3-C4 sister taxa supported the patterns derived from our modeling of the larger clade groupings. Our findings, which are novel in comparing the distribution and niches of clades, demonstrate that the evolutionary history of taxa is important for understanding the functional diversity of C3 and C4 grasses, and should have implications for how grasslands will respond to global change. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62580
Appears in Collections: 影响、适应和脆弱性
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作者单位: National Center for Ecological Analysis and Synthesis (NCEAS), 735 State Street Suite 300, Santa Barbara, CA 93101, United States; Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02912, United States; Department of Geography, University of California, Santa Barbara, CA 93106-4060, United States; Forest Ecosystems and Society, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331-5752, United States
Recommended Citation:
Pau S.,Edwards E.J.,Still C.J.. Improving our understanding of environmental controls on the distribution of C3 and C4 grasses[J]. Global Change Biology,2013-01-01,19(1)