Abstract
Abstract The natural growth of a Posidonia oceanica meadow is the result of a long process of development (series of events), but the dynamics are often difficult to establish because of the lack of a zero state and of sufficiently long chronological series. In addition, while it is sometimes possible to observe major regressions, the phenomena of recolonisation and of small-scale fluctuations are rarely detected. Nevertheless, with the emergence of new investigatory techniques (lepidochronology, microcartography, monitoring networks, accurate dating techniques, etc.,) considerable progress has been made in this field. The development in space and time of the seagrass beds is dependant on hydrodynamic action and sedimentary deposits. This means that in sheltered bays Posidonia oceanica may form original structures such as barrier reefs or micro-atolls, while in turbulent waters one observes the formation of spectacular structures resulting from erosion (intermatte, “riviere de retour”). A disequilibrium i...
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