The use of Corbicula fluminea in the remediation of cyanobacterial blooms
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/22395 |
Resumo: | Cyanobacterial blooms are frequentetly linked to eutrophication in waterbodies and can be a problem for other organisms since some cyanobacteria are toxic, not only to aquatic organisms, but also to all those ingesting contaminated water or organisms that had previously accumulated toxins in their tissues. Studies exploring new strategies to control/remediate affected waters are thus of major relevance. This motivated the present study, where the assessment of the suitability of the freshwater bivalve Corbicula fluminea as a bioremediator agent within such scenarios was aimed. Although C. fluminea is a problematic invasive species, mostly in Europe and North America, its distribution is already wide, thus the exploitation of its powerful filtration capacities can become a valuable add-on in this pest’s management via compensating damage resulting from its impacts in invaded ecosystems. In a first stage, microscopic characterisation and genetic typing were carried out over a set of laboratory cyanobacteria cultures. These represent the most common taxa composing blooms that have been monitored in national waterbodies, including strains potentially producing cianotoxins. Some of the taxa considered were Anabaena cylindrica, Microcystis and Oscillatoriales. In a second stage, the capacity of the clams to filter and ingest each cyanobacteria was assessed, using short-term assays where each cyanobacteria was offered to the clams respecting densities typically found in blooms. The results often showed low filtration rates, especially compared to those reached as a green microalgae (Raphidocelis subcapitata) was offered. However, chlorophyll a mass balance analysis in the test system (Chl a filtered, retained in pseudofaeces and non-filtered) allowed some important outcomes. The agreggation and settling of filtered cyanobacteria promoted by C. fluminea through the production of pseudofaeces was notorious. This process resembles the use of flocculants to remove organic matter and microrganisms from the water column into the bottom for further aspiration, thus opening avenues to continuing assessing the possibility of using C. fluminea as a remediation for cyanobacterial blooms. |
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The use of Corbicula fluminea in the remediation of cyanobacterial bloomsBiotecnologia ambientalFiltraçãoCianobactérias - EflorescênciaAmeijoasEutrofizaçãoContaminação da águaCyanobacterial blooms are frequentetly linked to eutrophication in waterbodies and can be a problem for other organisms since some cyanobacteria are toxic, not only to aquatic organisms, but also to all those ingesting contaminated water or organisms that had previously accumulated toxins in their tissues. Studies exploring new strategies to control/remediate affected waters are thus of major relevance. This motivated the present study, where the assessment of the suitability of the freshwater bivalve Corbicula fluminea as a bioremediator agent within such scenarios was aimed. Although C. fluminea is a problematic invasive species, mostly in Europe and North America, its distribution is already wide, thus the exploitation of its powerful filtration capacities can become a valuable add-on in this pest’s management via compensating damage resulting from its impacts in invaded ecosystems. In a first stage, microscopic characterisation and genetic typing were carried out over a set of laboratory cyanobacteria cultures. These represent the most common taxa composing blooms that have been monitored in national waterbodies, including strains potentially producing cianotoxins. Some of the taxa considered were Anabaena cylindrica, Microcystis and Oscillatoriales. In a second stage, the capacity of the clams to filter and ingest each cyanobacteria was assessed, using short-term assays where each cyanobacteria was offered to the clams respecting densities typically found in blooms. The results often showed low filtration rates, especially compared to those reached as a green microalgae (Raphidocelis subcapitata) was offered. However, chlorophyll a mass balance analysis in the test system (Chl a filtered, retained in pseudofaeces and non-filtered) allowed some important outcomes. The agreggation and settling of filtered cyanobacteria promoted by C. fluminea through the production of pseudofaeces was notorious. This process resembles the use of flocculants to remove organic matter and microrganisms from the water column into the bottom for further aspiration, thus opening avenues to continuing assessing the possibility of using C. fluminea as a remediation for cyanobacterial blooms.Os blooms cianobacterianos estão associados à eutrofização em massas de água. Isto pode ser um problema para os restantes organismos, já que algumas cianobactérias podem ser tóxicas, não só para organismos aquáticos, como para os que ingiram água contaminada ou que acumulem toxinas nos seus tecidos. É assim da maior relevância o desenvolvimento de estudos que explorem formas de controlar/remediar águas afetadas pelo problema. Tal constituiu a principal motivação do presente estudo, cujo objetivo geral foi a avaliação da capacidade de um bivalve de água doce, Corbicula fluminea, enquanto agente bioremediador nestes cenários. Embora C. fluminea seja uma espécie invasora problemática na Europa e América do Norte, a sua distribuição já é muito alargada, pelo que o aproveitamento do seu elevado poder de filtração poderá ser uma boa estratégia de gestão da peste via compensação de danos resultantes do seu impacto em ecossistemas invadidos. Numa primeira fase do trabalho foi caracterizado (com recurso a ferramentas de microscopia e de tipagem genética) um conjunto de culturas laboratoriais de cianobactérias representativo da composição mais comum dos blooms ocorrentes em massas de água nacionais, incluindo espécies potencialmente produtoras de cianotoxinas. Alguns dos taxa de cianobactérias consideradas foram Anabaena cylindrica; Microcystis ou Oscillatoriales. Na segunda fase do trabalho foi avaliada a capacidade de C. fluminea para filtrar e ingerir cada uma das cianobactérias, em ensaios de curta duração com cada cianobactéria, oferecida em densidade típica de bloom. Os resultados obtidos revelaram baixas taxas de filtração em muitos casos, sobretudo quando comparadas com as taxas de filtração atingidas quando foi oferecida uma microalga verde (Raphidocelis subcapitata). No entanto, a análise de balanço de massa de clorofila a no sistema (filtrada e ingerida, retida em pseudofezes e não filtrada) permitiu algumas anotações importantes. Foi notória a relevância da agregação e sedimentação de cianobactérias filtradas promovida por C. fluminea, através das pseudofezes. Este processo tem semelhanças com o que é conseguido com a aplicação de químicos floculantes, usados para remover matéria orgânica e organismos microscópicos indesejados da coluna de água (por sedimentação e posterior aspiração), assim abrindo caminho para a continuação da exploração da possibilidade de utilização de C. fluminea como agente de remediação de blooms cianobacterianos.Universidade de Aveiro2018-02-27T13:30:40Z2016-01-01T00:00:00Z2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/22395eng201933446Anselmo, António Eduardo Vicenteinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:43:59Zoai:ria.ua.pt:10773/22395Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:56:36.143652Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
title |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
spellingShingle |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms Anselmo, António Eduardo Vicente Biotecnologia ambiental Filtração Cianobactérias - Eflorescência Ameijoas Eutrofização Contaminação da água |
title_short |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
title_full |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
title_fullStr |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
title_full_unstemmed |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
title_sort |
The use of Corbicula fluminea in the remediation of cyanobacterial blooms |
author |
Anselmo, António Eduardo Vicente |
author_facet |
Anselmo, António Eduardo Vicente |
author_role |
author |
dc.contributor.author.fl_str_mv |
Anselmo, António Eduardo Vicente |
dc.subject.por.fl_str_mv |
Biotecnologia ambiental Filtração Cianobactérias - Eflorescência Ameijoas Eutrofização Contaminação da água |
topic |
Biotecnologia ambiental Filtração Cianobactérias - Eflorescência Ameijoas Eutrofização Contaminação da água |
description |
Cyanobacterial blooms are frequentetly linked to eutrophication in waterbodies and can be a problem for other organisms since some cyanobacteria are toxic, not only to aquatic organisms, but also to all those ingesting contaminated water or organisms that had previously accumulated toxins in their tissues. Studies exploring new strategies to control/remediate affected waters are thus of major relevance. This motivated the present study, where the assessment of the suitability of the freshwater bivalve Corbicula fluminea as a bioremediator agent within such scenarios was aimed. Although C. fluminea is a problematic invasive species, mostly in Europe and North America, its distribution is already wide, thus the exploitation of its powerful filtration capacities can become a valuable add-on in this pest’s management via compensating damage resulting from its impacts in invaded ecosystems. In a first stage, microscopic characterisation and genetic typing were carried out over a set of laboratory cyanobacteria cultures. These represent the most common taxa composing blooms that have been monitored in national waterbodies, including strains potentially producing cianotoxins. Some of the taxa considered were Anabaena cylindrica, Microcystis and Oscillatoriales. In a second stage, the capacity of the clams to filter and ingest each cyanobacteria was assessed, using short-term assays where each cyanobacteria was offered to the clams respecting densities typically found in blooms. The results often showed low filtration rates, especially compared to those reached as a green microalgae (Raphidocelis subcapitata) was offered. However, chlorophyll a mass balance analysis in the test system (Chl a filtered, retained in pseudofaeces and non-filtered) allowed some important outcomes. The agreggation and settling of filtered cyanobacteria promoted by C. fluminea through the production of pseudofaeces was notorious. This process resembles the use of flocculants to remove organic matter and microrganisms from the water column into the bottom for further aspiration, thus opening avenues to continuing assessing the possibility of using C. fluminea as a remediation for cyanobacterial blooms. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-01-01T00:00:00Z 2016 2018-02-27T13:30:40Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/22395 |
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http://hdl.handle.net/10773/22395 |
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eng |
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eng |
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201933446 |
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info:eu-repo/semantics/openAccess |
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Universidade de Aveiro |
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Universidade de Aveiro |
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