scholarly journals Drought response strategies define the relative contributions of hydraulic dysfunction and carbohydrate depletion during tree mortality

2012 ◽  
Vol 197 (3) ◽  
pp. 862-872 ◽  
Author(s):  
Patrick J. Mitchell ◽  
Anthony P. O'Grady ◽  
David T. Tissue ◽  
Donald A. White ◽  
Maria L. Ottenschlaeger ◽  
...  
Keyword(s):  
Tree Mortality ◽  
Drought Response ◽  
Response Strategies ◽  
Carbohydrate Depletion

scholarly journals Contrasting drought-response strategies in California redwoods

2015 ◽  
Vol 35 (5) ◽  
pp. 453-469 ◽  
Author(s):  
A. R. Ambrose ◽  
W. L. Baxter ◽  
C. S. Wong ◽  
R. R. Naesborg ◽  
C. B. Williams ◽  
...  
Keyword(s):  
Drought Response ◽  
Response Strategies

scholarly journals Drought‐response strategies of savanna herbivores

2019 ◽  
Vol 9 (12) ◽  
pp. 7047-7056 ◽  
Author(s):  
Joel O. Abraham ◽  
Gareth P. Hempson ◽  
A. Carla Staver
Keyword(s):  
Drought Response ◽  
Response Strategies

scholarly journals Leaf turgor loss as a predictor of plant drought response strategies

2018 ◽  
Vol 38 (5) ◽  
pp. 655-657 ◽  
Author(s):  
Chris J Blackman
Keyword(s):  
Drought Response ◽  
Response Strategies

Drought response strategies of deciduous and evergreen woody species in a seasonally dry neotropical forest

Oecologia ◽  
2020 ◽  
Vol 194 (1-2) ◽  
pp. 221-236
Author(s):  
Bruno Cruz de Souza ◽  
Ellen Cristina Dantas Carvalho ◽  
Rafael S. Oliveira ◽  
Francisca Soares de Araujo ◽  
André Luiz Alves de Lima ◽  
...  
Keyword(s):  
Woody Species ◽  
Drought Response ◽  
Seasonally Dry ◽  
Response Strategies ◽  
Neotropical Forest

scholarly journals Drought response strategies and hydraulic traits contribute to mechanistic understanding of plant dry-down to hydraulic failure

2019 ◽  
Vol 39 (6) ◽  
pp. 910-924 ◽  
Author(s):  
Chris J Blackman ◽  
Danielle Creek ◽  
Chelsea Maier ◽  
Michael J Aspinwall ◽  
John E Drake ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Tree Mortality ◽  
Stomatal Closure ◽  
Safety Margin ◽  
Critical Levels ◽  
Response Strategies ◽  
Hydraulic Failure ◽  
Dry Down ◽  
Leaf Succulence ◽  
And Function

Abstract Drought-induced tree mortality alters forest structure and function, yet our ability to predict when and how different species die during drought remains limited. Here, we explore how stomatal control and drought tolerance traits influence the duration of drought stress leading to critical levels of hydraulic failure. We examined the growth and physiological responses of four woody plant species (three angiosperms and one conifer) representing a range of water-use and drought tolerance traits over the course of two controlled drought–recovery cycles followed by an extended dry-down. At the end of the final dry-down phase, we measured changes in biomass ratios and leaf carbohydrates. During the first and second drought phases, plants of all species closed their stomata in response to decreasing water potential, but only the conifer species avoided water potentials associated with xylem embolism as a result of early stomatal closure relative to thresholds of hydraulic dysfunction. The time it took plants to reach critical levels of water stress during the final dry-down was similar among the angiosperms (ranging from 39 to 57 days to stemP88) and longer in the conifer (156 days to stemP50). Plant dry-down time was influenced by a number of factors including species stomatal-hydraulic safety margin (gsP90 – stemP50), as well as leaf succulence and minimum stomatal conductance. Leaf carbohydrate reserves (starch) were not depleted at the end of the final dry-down in any species, irrespective of the duration of drought. These findings highlight the need to consider multiple structural and functional traits when predicting the timing of hydraulic failure in plants.

Changes in drought response strategies with ontogeny in Quercus rubra: implications for scaling from seedlings to mature trees

Oecologia ◽  
2000 ◽  
Vol 124 (1) ◽  
pp. 8-18 ◽  
Author(s):  
J. Cavender-Bares ◽  
F. A. Bazzaz
Keyword(s):  
Quercus Rubra ◽  
Drought Response ◽  
Mature Trees ◽  
Response Strategies

Drought Response Strategies of Clarkia gracilis (Onagraceae) Populations from Serpentine and Nonserpentine Soils

2017 ◽  
Vol 178 (4) ◽  
pp. 313-319 ◽  
Author(s):  
M. Shane Heschel ◽  
Kathryn Dalton ◽  
Marley Jamason ◽  
Ashley D’Agnese ◽  
Lauren G. Ruane
Keyword(s):  
Drought Response ◽  
Response Strategies

scholarly journals Relative contributions of hydraulic dysfunction and carbohydrate depletion during tree mortality caused by drought

AoB Plants ◽  
2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Yongxin Dai ◽  
Lin Wang ◽  
Xianchong Wan
Keyword(s):  
Tree Mortality ◽  
Carbohydrate Depletion

Stimulus Ratio Effects on Speech Discrimination by Children and Adults

1991 ◽  
Vol 34 (3) ◽  
pp. 671-678 ◽  
Author(s):  
Joan E. Sussman
Keyword(s):  
Discrimination Task ◽  
Response Pattern ◽  
Response Patterns ◽  
Speech Discrimination ◽  
Adult Group ◽  
Discrimination Accuracy ◽  
Formant Frequency ◽  
Response Strategies ◽  
Place Of Articulation ◽  
Adults And Children

This investigation examined the response strategies and discrimination accuracy of adults and children aged 5–10 as the ratio of same to different trials was varied across three conditions of a “change/no-change” discrimination task. The conditions varied as follows: (a) a ratio of one-third same to two-thirds different trials (33% same), (b) an equal ratio of same to different trials (50% same), and (c) a ratio of two-thirds same to one-third different trials (67% same). Stimuli were synthetic consonant-vowel syllables that changed along a place of articulation dimension by formant frequency transition. Results showed that all subjects changed their response strategies depending on the ratio of same-to-different trials. The most lax response pattern was observed for the 50% same condition, and the most conservative pattern was observed for the 67% same condition. Adult response patterns were most conservative across condition. Differences in discrimination accuracy as measured by P(C) were found, with the largest difference in the 5- to 6-year-old group and the smallest change in the adult group. These findings suggest that children’s response strategies, like those of adults, can be manipulated by changing the ratio of same-to-different trials. Furthermore, interpretation of sensitivity measures must be referenced to task variables such as the ratio of same-to-different trials.

The Effects of Visual Displays in Attenuating Discrepancies Between Self-Reported and Physiological Indexes of Stress

2020 ◽  
pp. 1-5
Author(s):  
Jenny J. W. Liu ◽  
Julia Gervasio ◽  
Kenneth Fung ◽  
Kristin Vickers
Keyword(s):  
Social Stress ◽  
Visual Display ◽  
Physiological Measures ◽  
Response Strategies ◽  
Subjective Evaluations ◽  
Stress Task ◽  
Physiological Indexes ◽  
Physiological Outcomes ◽  
Physiological Markers ◽  
The Relationship

Abstract. This study examined whether the relationship between subjective and physiological outcomes of stress, and the responsivity to stressors, are affected by whether participants can see a visual display of their physiological output. Participants were randomly assigned to have a visible view of their physiological output readings, or to a condition in which physiological output readings were out of view. Participants individually completed a 30-min laboratory study including the modified Trier Social Stress Task. Both physiological markers of stress (heart rate and blood pressure) and subjective evaluations of stress (visual analog scale) were measured. Results found little congruency across subjective and physiological measures of stress. The visible visual display condition had elevated physiological arousal, while no group differences were observed in self-reported stress. Findings from the study provide insight into the use of visual physiological displays and hold practical implications for both the measurement of stress in research, and the development of wearable technologies without accompanying response strategies.

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