Environmental niche variation and evolutionary diversification of the Brachypodium distachyon grass complex species in their native circum-Mediterranean range

López Álvarez, Diana and Manzaneda, Antonio J. and Rey, Pedro J. and Giraldo Carbajo, Patricia and Benavente Barzana, M. Elena and Anllaiguillaume, Joël and Mur, Luis and Caicedo, Ana L. and Hazen, Salmuel P. and Breiman, Adina and Ezrati, Smadar and Catalán Rodríguez, Pilar (2015). Environmental niche variation and evolutionary diversification of the Brachypodium distachyon grass complex species in their native circum-Mediterranean range. "American Journal of Botany", v. 102 (n. 7); pp. 1073-1088. ISSN 0002-9122. https://doi.org/10.3732/ajb.1500128.

Description

Title: Environmental niche variation and evolutionary diversification of the Brachypodium distachyon grass complex species in their native circum-Mediterranean range
Author/s:
  • López Álvarez, Diana
  • Manzaneda, Antonio J.
  • Rey, Pedro J.
  • Giraldo Carbajo, Patricia
  • Benavente Barzana, M. Elena
  • Anllaiguillaume, Joël
  • Mur, Luis
  • Caicedo, Ana L.
  • Hazen, Salmuel P.
  • Breiman, Adina
  • Ezrati, Smadar
  • Catalán Rodríguez, Pilar
Item Type: Article
Título de Revista/Publicación: American Journal of Botany
Date: July 2015
ISSN: 0002-9122
Volume: 102
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Biotecnología - Biología Vegetal
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

PREMISE OF THE STUDY: We conducted environmental niche modeling (ENM) of the Brachypodium distachyon s.l. complex, a model group of two diploid annual grasses ( B. distachyon , B. stacei ) and their derived allotetraploid ( B. hybridum) , native to the circum-Mediterranean region. We (1) investigated the ENMs of the three species in their native range based on present and past climate data; (2) identifi ed potential overlapping niches of the diploids and their hybrid across four Quaternary windows; (3) tested whether speciation was associated with niche divergence/conservatism in the complex species; and (4) tested for the potential of the polyploid outperforming the diploids in the native range. M ETHODS: Geo-referenced data, altitude, and 19 climatic variables were used to construct the ENMs. We used paleoclimate niche models to trace the potential existence of ancestral gene fl ow among the hybridizing species of the complex. KEY RESULTS: Brachypodium distachyon grows in higher, cooler, and wetter places, B. stacei in lower, warmer, and drier places, and B. hybridum in places with intermediate climatic features. Brachypodium hybridum had the largest niche overlap with its parent niches, but a similar distribution range and niche breadth. C ONCLUSIONS: Each species had a unique environmental niche though there were multiple niche overlapping areas for the diploids across time, suggesting the potential existence of several hybrid zones during the Pleistocene and the Holocene. No evidence of niche divergence was found, suggesting that species diversifi cation was not driven by ecological speciation but by evolutionary history, though it could be associated to distinct environmental adaptations.

More information

Item ID: 41165
DC Identifier: http://oa.upm.es/41165/
OAI Identifier: oai:oa.upm.es:41165
DOI: 10.3732/ajb.1500128
Official URL: https://bsapubs.onlinelibrary.wiley.com/doi/full/10.3732/ajb.1500128
Deposited by: Memoria Investigacion
Deposited on: 23 Jun 2016 16:50
Last Modified: 06 Jun 2019 15:43
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