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פותח על ידי קלירמאש פתרונות בע"מ -
Spatial patterns provide support for the stress-gradient hypothesis over a range-wide aridity gradient
Year:
2014
Source of publication :
Journal of Arid Environments
Authors :
אוסם, יגיל
;
.
Volume :
102
Co-Authors:
Ziffer-Berger, J., Herbarium of the Hebrew University, Giv'at Ram, Jerusalem, Israel
Weisberg, P.J., Dept. of Natural Resources and Environmental Science, University of Nevada, Reno, NV, United States
Cablk, M.E., Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States
Osem, Y., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Facilitators :
From page:
27
To page:
33
(
Total pages:
7
)
Abstract:
We examined variations in the relative importance of facilitation vs. competition, in light of the Stress-Gradient Hypothesis (SGH) by assessing plant interactions along an aridity gradient over biogeographic scales. We surveyed the relationship between a shrub species (. Artemisia tridentata) and pine seedlings (. Pinus monophylla) across the Great Basin and the Mojave Desert, USA, encompassing the entire range of P.monophylla. Using 69 sites we evaluated the spatial association between P.monophylla seedlings and A.tridentata shrubs, quantified with an electivity index, and implemented multiple regression analysis on the effects of macro- and micro-environmental factors: precipitation, temperature, monsoonality index, topography, substrate and litter cover. We identified annual precipitation as a main factor, which was negatively related to shrub-seedling association. Additionally, shrub-seedling association was stronger in the hot- than in the cold-desert, and was negatively related to litter cover. Effects of monsoonality, summer temperature, and bedrock type were not significant. We also considered nonlinear functional forms of a precipitation-electivity relationship, but the negative linear model proved most predictive. Our observations match SGH predictions. Studying the role of interspecific interactions in shaping species range shifts may lead to improved predictions of distribution ranges and changes in dryland vegetation under global change scenarios. © 2013 Elsevier Ltd.
Note:
Related Files :
biogeography
Facilitation
Mojave Desert
nonlinearity
precipitation (climatology)
regression analysis
shrub
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.jaridenv.2013.11.006
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
21454
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:44
You may also be interested in
Scientific Publication
Spatial patterns provide support for the stress-gradient hypothesis over a range-wide aridity gradient
102
Ziffer-Berger, J., Herbarium of the Hebrew University, Giv'at Ram, Jerusalem, Israel
Weisberg, P.J., Dept. of Natural Resources and Environmental Science, University of Nevada, Reno, NV, United States
Cablk, M.E., Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States
Osem, Y., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Spatial patterns provide support for the stress-gradient hypothesis over a range-wide aridity gradient
We examined variations in the relative importance of facilitation vs. competition, in light of the Stress-Gradient Hypothesis (SGH) by assessing plant interactions along an aridity gradient over biogeographic scales. We surveyed the relationship between a shrub species (. Artemisia tridentata) and pine seedlings (. Pinus monophylla) across the Great Basin and the Mojave Desert, USA, encompassing the entire range of P.monophylla. Using 69 sites we evaluated the spatial association between P.monophylla seedlings and A.tridentata shrubs, quantified with an electivity index, and implemented multiple regression analysis on the effects of macro- and micro-environmental factors: precipitation, temperature, monsoonality index, topography, substrate and litter cover. We identified annual precipitation as a main factor, which was negatively related to shrub-seedling association. Additionally, shrub-seedling association was stronger in the hot- than in the cold-desert, and was negatively related to litter cover. Effects of monsoonality, summer temperature, and bedrock type were not significant. We also considered nonlinear functional forms of a precipitation-electivity relationship, but the negative linear model proved most predictive. Our observations match SGH predictions. Studying the role of interspecific interactions in shaping species range shifts may lead to improved predictions of distribution ranges and changes in dryland vegetation under global change scenarios. © 2013 Elsevier Ltd.
Scientific Publication
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