effects of dredging operations on soft bottom macrofauna in a harbor in the patos lagoon estuarine region of southern brazil

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Abstract
An evaluation was made of the effects of dredging on the soft bottom community in the channel of the Rio Grande harbor in the Patos Lagoon estuarine region of southern Brazil. During four seasonal cruises, samples were collected from nine biological stations, one of which was located outside the dredged area. Three macrobenthic samples were collected on each cruise from each station, using a 0.08 m² van Veen grab. A cluster analysis was applied to group summer and autumn cruise stations before the dredging period, revealing larger numbers of species (35-36 spp.) and higher densities of organisms. The station located outside the dredging area was always included in this group, regardless of the sampling period or conditions of salinity. Another group comprised the winter and spring stations during the dredging period. This group was characterized by stations with the fewest species (20-18 spp.) and the lowest and most variable organism densities. The efficient strategies of resilience of the dominant estuarine species may minimize the effects of dredging on the biota through the rapid recolonization of the soft bottom of the harbor channel.
Reference Key
bemvenutibrazilianeffects Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;C. E. Bemvenuti;L. G. Angonesi;M. S. Gandra
Journal international journal of economic and environment geology
Year Year not found
DOI
10.1590/S1519-69842005000400003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842005000400003&lng=en&tlng=en
Keywords
resilience macrobenthos

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