ISLA Federico Ignacio
Macroinfaunal distribution at an organic-enriched estuarine harbour
GODOY ENRIQUE; ISLA, F; ELIAS RODOLFO
Lugar: Porto Alegre; Año: 2011 p. 57 - 67
Estuarine benthic assemblages are highly sensitive to pollution. At the same time, they are sensitive to chemical and/or physical changes induced by tides or floods. The estuary of the Quequén Grande River is occupied by a harbour with a constant trading of cereals. Benthic communities are best environmental indicators. In order to evaluate the health of the harbour, a limited sampling of infaunal benthic community was carried out. Nematodes and Capitella "capitata" sp. were the most common species. As the harbour is enriched in organic matter derived from the cities of both margins and the jetties inhibit wave or wind action on the bottom, anoxic conditions prevail almost all year. Therefore, the disposal of the anoxic muds dredged is matter of concern in relation to resort beaches. Peak discharges of the river, constant dredging and the enrichment with organic matter are explaining the present distribution and abundance of these communities.