Artículo
Trait-density-microsite interactions indicate plastic and non-plastic germination strategies of co-occurring desert annual plants
Fecha de publicación:
08/2020
Editorial:
Academic Press Ltd - Elsevier Science Ltd
Revista:
Journal of Arid Environments
ISSN:
0140-1963
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Functional traits have been linked to relevant vital rates across co-occurring species, such as growth and survival. However, the relationship between plant traits and germination has been much less studied, despite that germination can be a key transition for plants. Building on evolutionary theory, we propose that variation in germination fraction across co-occurring desert annual plants may result from the interaction of post-germination plant traits, density dependence and microsite type. Our study system consisted of three summer annual species abundant in a desert in western Argentina, for which we quantified germination fractions in three microsite types: Larrea divaricata shrub, Bulnesia retama shrub, and open spaces among shrubs. Based on post-germination trait data (summarized by a principal component, PC1), the annual species can be arranged in terms of increasing stress-tolerance, from Amaranthus standleyanus, to Gomphrena martiana and Tribulus terrestris. We found an interaction between PC1 and density of conspecific seeds suggesting that the strength of plastic negative density-dependence decreased with the increase of plant stress-tolerance. Our results emphasize that both plastic and non-plastic (bet-hedging) mechanisms would contribute to shape germination dynamics across annual plants, and that plant traits can offer parsimonious explanations for such cross-species variation.
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Articulos(IFEVA)
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Citación
Carmona Crocco, Julieta; Rolhauser, Andrés Guillermo; Pucheta, Eduardo Raúl; Trait-density-microsite interactions indicate plastic and non-plastic germination strategies of co-occurring desert annual plants; Academic Press Ltd - Elsevier Science Ltd; Journal of Arid Environments; 179; 104178; 8-2020; 1-6
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