Fecha/hora: 15/06/2024 19:21:23

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	24/05/2023	
Fecha de la última actualización: 	24/05/2023	
Autoria: 	GARCÍA, S.; GUIDO, A.; PEZZANI, F.; LATTANZI, F.	
Afiliación: 	SILVINA GARCÍA, Ecología, Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Montevideo, Uruguay; ANACLARA GUIDO, Grupo Ecología de Pastizales, Instituto de Ecología y Ciencias Ambientales, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay; FABIANA PEZZANI, Ecología, Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Montevideo, Uruguay; FERNANDO A. LATTANZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Invasion strategies of Cynodon dactylon: competitive ability under low-nutrient conditions	
Año de publicación: 	2023	
Fuente/Imprenta: 	Austral Ecology, 2023. https://doi.org/10.1111/aec.13341	
ISSN: 	1442-9985	
DOI: 	10.1111/aec.13341	
Idioma: 	Inglés	
Notas: 	Article history: Received 8 July 2022; Revised 10 April 2023; Accepted 13 April 2023; First published 05 May 2023. -- Correspondence auhtor: García, S.; Ecología, Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Montevideo, Uruguay; email:sgarciae@fagro.edu.uy -- Funding: This research was funded by Instituto Nacional de Investigación Agropecuaria (INIA) and Comisión Sectorial de Investigación Científica (UdelaR-CSIC), Comisión Académica de Posgrado (CAP, Silvina García received a doctoral fellowship).	
Contenido: 	ABSTRACT.- Cynodon dactylon is one of the five most important invasive alien species worldwide. It is the invasive alien species with the broadest distribution range in Uruguay, and its expansion is frequently associated with disturbances. Since natural grasslands are facing processes of productive intensification, C. dactylon represents a threat as it could displace native species. However, the mechanisms that explain its invasion success remain unclear. The objective of this study was to analyse interspecific interactions under low nutrient conditions between C. dactylon and two species that are native to the Campo grasslands in Uruguay. Specifically, we assessed differences in the components of competitive ability effects and responses (or tolerance) as possible mechanisms involved in C. dactylon invasiveness. We performed a greenhouse experiment in pots with low-nutrient substrate assessing pair-wise interactions between C. dactylon, Mnesithea selloana and Paspalum notatum plus control pots consisting of single individual of each species. The invasive species showed greater competitive ability than both native grasses, as it reduced their below and above-biomass. Conversely, the size of C. dactylon plants interacting with native species was similar to that of single C. dactylon plants growing alone (controls). This reveals that the greater competitive ability of the invasive species was due to a greater tolerance to grow with neighbouring plants. The reason underlying this tolerance was a marked increase in biomass allocation towards stolons and leaves, at the expense of roots. Conversely, native species barely changed their shoot-root allocation pattern when interacting with neighbours. Furthermore, C. dactylon induced reproductive development solely when interacting with neighbours. Along with the fact that the potential growth rate of the invasive and native species was quite similar, these results suggest that sensitive and rapidly triggered shade avoidance responses could be one mechanism involved in the invasion success of C. dactylon. © 2023 Ecological Society of Australia.	
Palabras-Clave: 	Biological invasions; Competitive ability; Mnesithea selloana; Paspalum notatum; Uruguayan campo grasslands.	
Categoría del tema: 	F01 Cultivo	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103512-1) - PXI - AP - DD - Austral Ecology/2023 -  -  - DIS