Abstract
The budgets of nitrogen, suspended solids and chlorophyll a were studied in June, August and October 2001 at the north pond of Osaka Nanko Bird Sanctuary. The output of suspended solids to coastal water exceeded its input to the pond, while chlorophyll a was intercepted within the pond through tidal exchange. The dissolved inorganic nitrogen imported into the pond was temporally incorporated into the biomass and was then exported in the form of dissolved organic nitrogen. Particulate nitrogen was abundant as a resource of nitrogenous nutrients output to coastal water in the summer of 2001. These phenomena are thought to correlate with biological activities such as feeding, fixation and decomposition by benthic animals, seaweeds and benthic microalgae.
