Population and community dynamics

Seagrass meadows often appear to the casual observer as static landscapes. However, seagrass meadows are subject to intense dynamics involving the continuous loss and replacement of shoots in the population, which, when in balance, maintain a dynamic equilibrium. Such apparent steady-state conditions can be maintained over extended time periods, leading to long-lived seagrass meadows, such as some Posidonia oceanica meadows, which possibly may persist for > 4000 years in the Mediterranean (e.g. Mateo et al., 1997), and Zostera marina meadows exceeding a millennium in age (Reusch et al., 1999).