New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems

Detalhes bibliográficos
Autor(a) principal: NOVA,CLARICE C.
Data de Publicação: 2021
Outros Autores: ROCHA,ADRIANA M., BRANCO,CHRISTINA W.C., BOZELLI,REINALDO L.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652021000701001
Resumo: Abstract Aquatic humic substances (HS) represent about 60-95% of the dissolved organic carbon (DOC) present in coastal environments of northern Rio de Janeiro state, Brazil. Although they are important regulators of processes involving aquatic communities, the response of the zooplankton community to their presence remains poorly understood, especially in natural tropical environments. Therefore, our objective was to elucidate zooplankton community responses along a natural gradient of HS. Such natural humic gradient was obtained in coastal freshwater environments with distinct DOC concentrations (20-200 mg L-1). Results show a decrease in zooplankton density and biomass along the HS gradient. However, microphages organisms (e.g. non-predatory rotifers and smaller testate amoeba, such as Difflugia) were most present in environments with higher concentration of HS, probably due to a stronger importance of the microbial-loop in these environments. Some species – such as Scapholeberis armata (Cladocera) and Lecane boettgeri (Rotifera) were only accounted for environments with high HS concentration, illustrating their potential as bioindicators for HS presence. Nevertheless, we were able to observe the effects of HS on the structure and composition of primary consumers and how these substances might indirectly affect species dynamics. We point out to new findings in highly humic tropical environments, which are still poorly studied and understood.
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spelling New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystemsBlackwaterdissolved organic carbonplanktonprimary consumersAbstract Aquatic humic substances (HS) represent about 60-95% of the dissolved organic carbon (DOC) present in coastal environments of northern Rio de Janeiro state, Brazil. Although they are important regulators of processes involving aquatic communities, the response of the zooplankton community to their presence remains poorly understood, especially in natural tropical environments. Therefore, our objective was to elucidate zooplankton community responses along a natural gradient of HS. Such natural humic gradient was obtained in coastal freshwater environments with distinct DOC concentrations (20-200 mg L-1). Results show a decrease in zooplankton density and biomass along the HS gradient. However, microphages organisms (e.g. non-predatory rotifers and smaller testate amoeba, such as Difflugia) were most present in environments with higher concentration of HS, probably due to a stronger importance of the microbial-loop in these environments. Some species – such as Scapholeberis armata (Cladocera) and Lecane boettgeri (Rotifera) were only accounted for environments with high HS concentration, illustrating their potential as bioindicators for HS presence. Nevertheless, we were able to observe the effects of HS on the structure and composition of primary consumers and how these substances might indirectly affect species dynamics. We point out to new findings in highly humic tropical environments, which are still poorly studied and understood.Academia Brasileira de Ciências2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652021000701001Anais da Academia Brasileira de Ciências v.93 n.4 2021reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/0001-3765202120190409info:eu-repo/semantics/openAccessNOVA,CLARICE C.ROCHA,ADRIANA M.BRANCO,CHRISTINA W.C.BOZELLI,REINALDO L.eng2021-08-18T00:00:00Zoai:scielo:S0001-37652021000701001Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2021-08-18T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
title New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
spellingShingle New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
NOVA,CLARICE C.
Blackwater
dissolved organic carbon
plankton
primary consumers
title_short New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
title_full New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
title_fullStr New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
title_full_unstemmed New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
title_sort New insights on the relation between zooplankton and humic substances in tropical freshwater ecosystems
author NOVA,CLARICE C.
author_facet NOVA,CLARICE C.
ROCHA,ADRIANA M.
BRANCO,CHRISTINA W.C.
BOZELLI,REINALDO L.
author_role author
author2 ROCHA,ADRIANA M.
BRANCO,CHRISTINA W.C.
BOZELLI,REINALDO L.
author2_role author
author
author
dc.contributor.author.fl_str_mv NOVA,CLARICE C.
ROCHA,ADRIANA M.
BRANCO,CHRISTINA W.C.
BOZELLI,REINALDO L.
dc.subject.por.fl_str_mv Blackwater
dissolved organic carbon
plankton
primary consumers
topic Blackwater
dissolved organic carbon
plankton
primary consumers
description Abstract Aquatic humic substances (HS) represent about 60-95% of the dissolved organic carbon (DOC) present in coastal environments of northern Rio de Janeiro state, Brazil. Although they are important regulators of processes involving aquatic communities, the response of the zooplankton community to their presence remains poorly understood, especially in natural tropical environments. Therefore, our objective was to elucidate zooplankton community responses along a natural gradient of HS. Such natural humic gradient was obtained in coastal freshwater environments with distinct DOC concentrations (20-200 mg L-1). Results show a decrease in zooplankton density and biomass along the HS gradient. However, microphages organisms (e.g. non-predatory rotifers and smaller testate amoeba, such as Difflugia) were most present in environments with higher concentration of HS, probably due to a stronger importance of the microbial-loop in these environments. Some species – such as Scapholeberis armata (Cladocera) and Lecane boettgeri (Rotifera) were only accounted for environments with high HS concentration, illustrating their potential as bioindicators for HS presence. Nevertheless, we were able to observe the effects of HS on the structure and composition of primary consumers and how these substances might indirectly affect species dynamics. We point out to new findings in highly humic tropical environments, which are still poorly studied and understood.
publishDate 2021
dc.date.none.fl_str_mv 2021-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652021000701001
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652021000701001
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0001-3765202120190409
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.93 n.4 2021
reponame:Anais da Academia Brasileira de Ciências (Online)
instname:Academia Brasileira de Ciências (ABC)
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instname_str Academia Brasileira de Ciências (ABC)
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