2008
DOI: 10.1890/06-2080.1
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Photosynthetic Resource-Use Efficiency and Demographic Variability in Desert Winter Annual Plants

Abstract: We studied a guild of desert winter annual plants that differ in long-term variation in per capita reproductive success (lb, the product of per capita survival from germination to reproduction, l, times per capita reproduction of survivors, b) to relate individual function to population and community dynamics. We hypothesized that variation in lb should be related to species' positions along a trade-off between relative growth rate (RGR) and photosynthetic water-use efficiency (WUE) because lb is a species-spe… Show more

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Cited by 85 publications
(172 citation statements)
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“…Species with high RGR exhibit low WUE, whereas species with high WUE have low RGR. Our prior work has identified the key morphological and physiological traits that underlie growth capacity and lowwater tolerance in these species (23,25). Species that display high growth capacity allocate a large fraction of biomass to photosynthetic surfaces and have the ability to rapidly deploy large leaf area displays to maximize growth after infrequent, large rainfall events (23).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Species with high RGR exhibit low WUE, whereas species with high WUE have low RGR. Our prior work has identified the key morphological and physiological traits that underlie growth capacity and lowwater tolerance in these species (23,25). Species that display high growth capacity allocate a large fraction of biomass to photosynthetic surfaces and have the ability to rapidly deploy large leaf area displays to maximize growth after infrequent, large rainfall events (23).…”
Section: Resultsmentioning
confidence: 99%
“…Species that display high growth capacity allocate a large fraction of biomass to photosynthetic surfaces and have the ability to rapidly deploy large leaf area displays to maximize growth after infrequent, large rainfall events (23). Conversely, species that display high intrinsic WUE invest a large fraction of leaf nitrogen in the photosynthetic processes that become limiting at low temperatures characteristic of postrainfall periods, which optimizes carbon assimilation for the short windows of time after small but relatively frequent rain events (25). To capture this complexity, we conducted a principal components analysis of these traits that ref lect physiological and morphological capacities underlying the growth/low-resource tolerance tradeoff: specific leaf area (SLA), leaf mass ratio (LMR), relative growth rate plasticity, the ratio of maximum electron transport to maximum carboxylation velocity (J max :V Cmax ), and leaf nitrogen content (N leaf ).…”
Section: Resultsmentioning
confidence: 99%
“…The plants with higher WUE are able to assimilate more carbon at low volumes of water transpired, allowing them to safely develop under conditions of soil water deficit (Bacon, 2004). However, high WUE can constrain plant growth as a result of increased allocation of nitrogen to photosynthetic enzymes or by constricting net photosynthetic rate (Huxman et al, 2008).…”
Section: Introductionmentioning
confidence: 99%
“…The remaining limitation for coupling demographic models and climatological data is long-term, individual-based demographic information from natural populations. Unfortunately, such datasets are extremely rare in drylands (but see [28]). …”
Section: Introductionmentioning
confidence: 99%