Germination strategies in different successional types of Patagonian Monte species
DOI:
https://doi.org/10.25260/EA.23.33.3.0.1996Keywords:
dormancy, early species, intermediate species, late species, Monte Austral, seeds, pretreatments, ecological restorationAbstract
Knowledge of the germination requirements of native species, as well as the environmental factors that control them allows better comprehension of plant community and contributes to restoration programs. Disturbances can disrupt these dynamics by affecting the environment and the abundance of organisms that inhabit it. The recovery of disturbed environments depends on the characteristics of the species involved in the ecological succession process. Successional types of species (i.e., early, intermediate and late) are expected to exhibit distinct germination requirements and physiological traits that enable them to fulfill different roles in the succession process. In this work, the germination requirements of ten native species of Monte Desert classified according to their role in ecological succession were evaluated. The conditions that improve germination rates (i.e., percentage and germination time) were studied, applying different treatments to the seeds (C=control, E=scarification, F=stratification, O=dark conditions, R=soaking in water, CA=heat conditions, and their combinations). As expected, successional species types responded differently to germination treatments. Early species did not present dormancy mechanisms since control treatment germinated more than the rest of the treatments. Intermediate species showed higher and faster germination with scarification, although control treatment also achieved similar germination rates. Late successional species displayed dormancy mechanisms, with the treatment combining water soaking, darkness, and moist cold stratification showing the highest germination. Early and intermediate species appear to be the most suitable choices for ecological restoration projects, due to their higher germination rates and faster growth potential, which can promote vegetation cover more rapidly. These germination strategies, depending on the types of species, are valuable contributions to accelerate ecological succession and develop restoration strategies.
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