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Coupled plant traits adapted to wetting/drying cycles of substrates co-define niche multidimensionality
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  • Ulises Rodríguez-RoblesOrcid,
  • J. Tulio Arredondoi,
  • Elisabeth Huber-Sannwald,
  • Enrico A. Yépez,
  • J. Alfredo Ramos-Leal
Ulises Rodríguez-Robles
Orcid
Universidad de Guadalajara Centro Universitario de la Costa Sur
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J. Tulio Arredondoi
Instituto Potosino de Investigacion Cientifica y Tecnologica
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Elisabeth Huber-Sannwald
Instituto Potosino de Investigacion Cientifica y Tecnologica
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Enrico A. Yépez
Instituto Tecnologico de Sonora
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J. Alfredo Ramos-Leal
Instituto Potosino de Investigacion Cientifica y Tecnologica
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Peer review status:UNDER REVIEW

08 Apr 2020Submitted to Plant, Cell & Environment
09 Apr 2020Submission Checks Completed
09 Apr 2020Assigned to Editor
17 Apr 2020Reviewer(s) Assigned
31 May 2020Review(s) Completed, Editorial Evaluation Pending
18 Jun 20201st Revision Received
19 Jun 2020Submission Checks Completed
19 Jun 2020Assigned to Editor
20 Jun 2020Reviewer(s) Assigned
30 Jun 2020Review(s) Completed, Editorial Evaluation Pending

Abstract

Theories attempting to explain species coexistence in plant communities have argued in favor of species’ capacities to occupy a multidimensional niche with spatial, temporal and biotic axes. We used the concept of hydrological niche segregation to learn how ecological niches are structured both spatially and temporally and whether small scale humidity gradients between adjacent niches are the main factor explaining water partitioning among tree species in a highly water-limited semiarid forest ecosystem. By combining geophysical methods, isotopic ecology, plant ecophysiology and anatomical measurements, we show how coexisting pine and oak species share, use and temporally switch between diverse spatially distinct niches by employing a set of functionally coupled plant traits in response to changing environmental signals. We identified four geospatial niches that turned into nine, when considering the temporal dynamics of the wetting/drying cycles in the substrate and the particular plant species adaptations to garner, transfer, store and use water. Under water scarcity, pine and oak exhibited water use segregation from different niches, yet under maximum drought when oak trees crossed physiological thresholds, niche overlap occurred. The identification of niches and mechanistic understanding of when and how species use them will help unify theories of plant coexistence and competition.