Comparative Drought Physiology and Biogeography of Quercus gambelii and Quercus turbinella

Neilson, Ronald P.; Wullstein, L. H.

doi:10.2307/2425601

Cited by 21 publications

(15 citation statements)

References 17 publications

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“…Oaks are generally more drought‐tolerant than other co‐occurring angiosperms (Abrams ), but differences among species are not always clearly delineated by tolerances like turgor loss points. Differences among turgor loss points have been found among habitat‐divergent groups of oaks, but are not apparent in some co‐occurring species (Neilson and Wullstein , Corcuera et al. ).…”

Section: Introductionmentioning

confidence: 99%

Leaf‐level trade‐offs between drought avoidance and desiccation recovery drive elevation stratification in arid oaks

Fallon

Cavender‐Bares

2018

Ecosphere

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Citation: Fallon, B., and J. Cavender-Bares. 2018. Leaf-level trade-offs between drought avoidance and desiccation recovery drive elevation stratification in arid oaks. Ecosphere 9(3):e02149. 10. 1002/ecs2.2149 Abstract. Understanding the extent to which climate limitations drive elevation stratification among species is integral to predicting the impacts of climate change. Zonation patterns of species within mountains have been well documented, and shifts in these patterns have been correlated with recent warming. However, the physiological mechanisms that explain these zonation patterns are not well understood. We used a system of broadly sympatric oak species within semi-arid mountains to (1) investigate the extent to which species elevation ranges correlate with climate, (2) test for associations of cold and drought resistances with upper and lower elevation limits, and for trade-offs between resistance mechanisms with elevation, and (3) examine the extent to which species-wide climatic ranges predict traits that drive local community assembly along an elevation gradient. We found that aridity gradients but not winter minimum temperatures predict oak stratification. Species differed in drought resistance, demonstrating a tradeoff between drought avoidance and drought recovery. At lower elevations, species avoided drought stress during the dry season through leaf abscission; at upper elevations, they maintained transpiration but recovered from daily desiccation via higher leaf water storage capacity, rather than tolerating desiccation via lower turgor loss points. Freezing resistance, measured as stem electrolyte leakage, was not correlated with elevation differences. Taken together, these results indicate that elevation stratification is linked to drought resistance rather than freezing resistance. We also found evidence of niche partitioning among closely related oaks linked to contrasting leaf phenology. The functional, phenological, and physiological traits important for elevation stratification were correlated with species' range-wide mean annual precipitation and precipitation seasonality, but not aridity. Our findings indicate that drought resistance along a leaf avoidance-recovery trade-off is integral to species stratification within this semi-arid montane system. Additionally, the mechanism of stratification acts upon traits and strategies conserved at the species level. Species within this system are likely vulnerable to range retraction under increased drought as a consequence of this phenological avoidance-physiological tolerance trade-off.

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Section: Introductionmentioning

confidence: 99%

Leaf‐level trade‐offs between drought avoidance and desiccation recovery drive elevation stratification in arid oaks

Fallon

Cavender‐Bares

2018

Ecosphere

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“…Here, we investigated the extent to which changes in herbaceous density and biomass influence woody plant seedling establishment in grasslands under field conditions. Periods of elevated rainfall may trigger episodes of seed production and seedling establishment of woody plants in grasslands (McPherson and Wright 1990, Turner 1990, Harrington 1991, Carter 1994, while drought may promote grass die-off (O'Connor 1993), but have little effect on tree or shrub persistence (Carter 1964, Neilson andWullstein 1985 (Archer 1989(Archer , 1994. Periods of elevated rainfall may trigger episodes of seed production and seedling establishment of woody plants in grasslands (McPherson and Wright 1990, Turner 1990, Harrington 1991, Carter 1994, while drought may promote grass die-off (O'Connor 1993), but have little effect on tree or shrub persistence (Carter 1964, Neilson andWullstein 1985 (Archer 1989(Archer , 1994.…”

Section: Introductionmentioning

confidence: 99%

Shrub Invasion of Grassland: Recruitment Is Continuous and Not Regulated by Herbaceous Biomass or Density

Brown¹,

Archer²

1999

Ecology

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“…Tucker (1961) showed that Q turbinella and Q gambelii are ecologically separated, the former living in semi-arid areas compared to the more mesic habitats at higher altitude of the latter, but where they are sympatric, in certain forest types, they hybridize. Neilson and Wullstein (1985) reported that the differential drought response of the 2 species is primarily due to anatomical/morphological leaf differences but, unfortunately, no hybrids were studied. Rushton (1979) Disturbance may also be a factor in promoting hybridization.…”

mentioning

confidence: 99%

Natural hybridization within the genus Quercus L

1993

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Comparative Drought Physiology and Biogeography of Quercus gambelii and Quercus turbinella

Cited by 21 publications

References 17 publications

Leaf‐level trade‐offs between drought avoidance and desiccation recovery drive elevation stratification in arid oaks

Leaf‐level trade‐offs between drought avoidance and desiccation recovery drive elevation stratification in arid oaks

Shrub Invasion of Grassland: Recruitment Is Continuous and Not Regulated by Herbaceous Biomass or Density

Natural hybridization within the genus Quercus L

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