Zooplankton in the Paraná River Floodplain (South America) Before and After the Invasion of Limnoperna fortunei (Bivalvia)

The Asian freshwater invasive bivalve, Limnoperna fortunei (Dunker 1857), was introduced into South America through the Rio de la Plata estuary (Argentina) at the beginning of the 1990s. Between 1995 and 1996, the bivalve was first observed in the middle reaches of Paraná River, 600 km upstream from...

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Bibliographic Details
Published in:Wetlands (Wilmington, N.C.) N.C.), 2008-09, Vol.28 (3), p.695-702
Main Authors: Molina, Florencia Rojas, de Paggi, Susana José
Format: Article
Language:English
Subjects:
Abundance
Biomedical and Life Sciences
Bivalvia
Brackish
Chlorophyll
chlorophyll-a
Coastal Sciences
Ecology
Environmental Management
Estuaries
exotic species
Floodplains
Freshwater
Freshwater & Marine Ecology
Freshwater organisms
high water
Hydrogeology
Keratella
Landscape Ecology
Life Sciences
Limnoperna fortunei
low water
Marine
Mollusks
Nutrient concentrations
Physical factors
Phytoplankton
Plankton
REGULAR SUBMISSIONS
Rivers
Rotifera
Zooplankton
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Summary:The Asian freshwater invasive bivalve, Limnoperna fortunei (Dunker 1857), was introduced into South America through the Rio de la Plata estuary (Argentina) at the beginning of the 1990s. Between 1995 and 1996, the bivalve was first observed in the middle reaches of Paraná River, 600 km upstream from its original point of entry to the system. Here, we describe the present zooplankton communities of two secondary channels of the Middle Paraná River floodplain (Colastiné and Santa Fe rivers) and contrast them with pre-invasion communities using zooplankton data obtained during 1974–1975 (Sante Fe River) and 1971–1973/1981–1982 (Colastiné River). In both floodplain rivers, total zooplankton and rotifer abundance during low water were significantly lower in the post-invasion period than they were pre-invasion. Prior to invasion, mean zooplankton abundance in low water was greater than in high water, while post-invasion mean zooplankton abundances during low and high water were similar. The rotifer Keratella was significantly more abundant prior to mollusc invasion. Zooplankton abundance and chlorophyll-a concentration declined compared to the pre-invasion period and were not correlated with post-invasion physical factors. Nutrient concentrations increased post-invasion from increased human development, but did not stimulated zooplankton or phytoplankton.
ISSN:0277-5212
1943-6246
DOI:10.1672/07-179.1