Abstract

GONZALEZ MURACCIOLE, Aymará; CAUSIN, Humberto F  and  MADANES, Nora. Aspectos de la dinámica de la vegetación de un ambiente de la costa del río de la Plata: patrones fenológicos y evolución del contenido de clorofila. Rev. Mus. Argent. Cienc. Nat. [online]. 2013, vol.15, n.1, pp.29-38. ISSN 1853-0400.

The coast of Buenos Aires City and its surroundings have been modified by work of refilling, giving place to the creation of areas colonized by vegetation of continental origin, as well as by species transported by the rivers Paraná and Uruguay. Given that these areas result from the biotic response to human-induced conditions, they may be considered "novel ecosystems". Even though information is available with regards to their structure, no studies have been performed on their dynamics. In the present work, changes of foliar phenology and chlorophyll content were studied during a whole year in twelve representative species of different biotypes at a Tipuana tipu wood, growing on landfills. Data were analyzed with multivariate statistical methods. The analysis of leaf phenophases revealed two main strategies of developmental complementarity: in evergreen species, groups were characterized by differences in the relative abundance of the different phenofases across the year; while in deciduous species groups differed on either the period where certain phenofases peacked , and/or on their relative duration. The analysis chlorophyll content revealed five groups of species according to the time period when their foliage was photosynthetically active, and allowed us to characterize the months of maximum productivity in the system.

Keywords : Anthropic environment; Chlorophyll; Phenological complementarity; Novel ecosystem; Biotypes.

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