, Volume 345, Issue 2–3, pp 185–196 | Cite as

Macroinvertebrates on Eichhornia crassipes roots in two lakes of the Paraná River floodplain

  • Alicia Poi de Neiff
  • Richard Carignan


Changes in the abundance, biomass and in the relativeproportions of functional feeding groups ofmacroinvertebrates were studied for 17 months duringlow and high water periods in two floodplain lakeswith indirect connections to the Paraná River.At low water, Eichhornia crassipes root clusterswere colonized by comparatively low densities ofmacroinvertebrates, especially in the lake moredistant to the river. Collector-gatherers andpredators were the most abundant functional feedinggroups, but different taxa of these groups dominatedin the two lakes during low water.At high water, macroinvertebrates densities increasedas a result of increased flow through the roots. Inthis period, collector-filterers dominated at bothlakes and constituted over 34% of themacroinvertebrates. Four independent variables(conductivity, hydrological periods, dissolved oxygenand site) explain 87% of the variability inmacroinvertebrates density expressed as the number ofindividuals per m2. No significant relationshipwere found between macroinvertebrate biomass and anyof the independent variables.

floodplain lakes phytophilous macroinvertebrates Eichhornia crassipes hydrological regime 


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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Alicia Poi de Neiff
    • 1
  • Richard Carignan
    • 2
  1. 1.Centro de Ecología Aplicada del LitoralCorrientesArgentina
  2. 2.Département de Sciences BiologiquesUniversité de MontréalMontréalCanadá

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