2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/27/2021 | 2:00 PM - 3:30 PM | POTENTIAL ECOSYSTEM EFFECTS OF THE INVASIVE FRESHWATER BIVALVE CORBICULA FLUMINEA IN A TROPICAL SHALLOW LAKE | Virtual Platform
POTENTIAL ECOSYSTEM EFFECTS OF THE INVASIVE FRESHWATER BIVALVE CORBICULA FLUMINEA IN A TROPICAL SHALLOW LAKE
The widespread filter-feeding Corbicula fluminea is generally abundant in freshwater environments however, in neotropical ecosystems its effects are poorly measured. We aimed to estimate the possible impact of filtration and nutrient remineralization (NH4-N, PO4-3-P) in the tropical shallow lake of Paracambi small hydropower plant (SHP), Rio de Janeiro-Brazil. We sampled individuals during the winter of 2019 and summer of 2020 to access size as well field density and areal biomass. Then we combine our empirical data with published specific-size filtration and excretion models. We did not observe interannual difference in abundance or population filtration. There was no interannual difference in NH4-N areal excretion. The population potentially excretes significantly more PO4-3-P in summer. At the highest density sites (4760 ind m-2) C. fluminea can filter the entire water column (~13 L) within 19 minutes, excrete 2502 umol NH4-N m-2 h-1 and 643 umol PO4-3-P m-2 h-1. Our results suggest a potential and important ecological role of C. fluminea in the studied ecosystem. Once reached high densities, C. fluminea may modulate ecosystem function (e.g., dynamics of organic matter and nutrient cycling) through filtration and nutrient remineralization.
- Biogeochemistry
- Nutrient cycling
- Engineer
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Presenters/Authors
Kauan Fonseca
(), Universidade Federal do Estado do Rio de Janeiro (UNIRIO), kauanfonseca@live.com;
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Christina Wyss Castelo Branco
(), Universidade Federal do Estado do Rio de Janeiro (UNIRIO), cbranco.unirio@gmail.com;
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Samira da Guia Mello Portugal
(), Universidade Federal do Estado do Rio de Janeiro (UNIRIO), samiraportugal@unirio.br;
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Timothy Peter Moulton
(), Universidade do Estado do Rio de Janeiro (UERJ), moulton@uerj.br;
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