Abstract
The distribution and ecological niche of the dugong are considered in relation to their effects on tropical seagrass ecosystems. Features of the chemical and calorific nature of seagrasses are contrasted to those of most terrestrial plants. Biomass levels of northern Australian tropical seagrass communities are discussed in relation to the estimated daily intake of dry matter. Implications for the species resulting from probable food limitation at any one site are considered. Effects of feeding and feeding behaviour are considered in relation to nutrient cycling in the seagrass ecosystem. Interactions of dugongs with other users of the seagrass ecosystem particularly predators, including man, are discussed together with aspects of dugong conservation.
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