Invasion strategies ofCynodon dactylon: Competitive ability under low‐nutrient conditions

Abstract

AbstractCynodon dactylonis 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. dactylonrepresents 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 betweenC. dactylonand two species that are native to theCampograsslands in Uruguay. Specifically, we assessed differences in the components of competitive ability effects and responses (or tolerance) as possible mechanisms involved inC. dactyloninvasiveness. We performed a greenhouse experiment in pots with low‐nutrient substrate assessing pair‐wise interactions betweenC. dactylon,Mnesithea selloanaandPaspalum notatumplus 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 ofC. dactylonplants interacting with native species was similar to that of singleC. dactylonplants 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. dactyloninduced 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 ofC. dactylon.