@Article{MarottaPFOCKMCMPP:2020:InVaNi,
author = "Marotta, Humberto and Peixoto, Roberta Bittencourt and Fernandes,
Tainan da Fonseca and Oliveira, Vin{\'{\i}}cius Peruzzi de and
Costa, Rodrigo and Keim, Ricardo and Musetti, Carlos and Cunha,
Let{\'{\i}}cia Cotrim da and Moser, Gleyci and Pollery, Ricardo
and Pinho, Luana",
affiliation = "{Universidade Federal Fluminense (UFF)} and {Universidade Federal
Fluminense (UFF)} and {Universidade Federal Fluminense (UFF)} and
{Universidade Federal do Rio de Janeiro (UFRJ)} and {Universidade
Federal do Rio de Janeiro (UFRJ)} and {Universidade Federal de Rio
Grande} and {Universidade Federal de Rio Grande} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade do
Estado do Rio de Janeiro (UERJ)} and {Universidade Federal do Rio
de Janeiro (UFRJ)} and {Universidade Federal de Rio Grande}",
title = "Biomonitoramento cont{\'{\i}}nuo de {\'a}guas do
peld-ba{\'{\i}}a de guanabara: Intensa varia{\c{c}}{\~a}o
nictemeral de gases metab{\'o}licos na condi{\c{c}}{\~a}o
eutr{\'o}fica tropical",
journal = "Oecologia Australis",
year = "2020",
volume = "24",
number = "2",
pages = "365--388",
keywords = "Gases de efeito estufa, acidifica{\c{c}}{\~a}o, hip{\'o}xia,
eutrofiza{\c{c}}{\~a}o, varia{\c{c}}{\~a}o nictemeral,
Greenhouse gases, acidification, hypoxia, eutrophication,
within-day variation.",
abstract = "Evid{\^e}ncias crescentes indicam importantes consequ{\^e}ncias
de mudan{\c{c}}as globais relacionadas a
eutrofiza{\c{c}}{\~a}o, hip{\'o}xia, acidifica{\c{c}}{\~a}o e
balan{\c{c}}o de gases envolvidos na s{\'{\i}}ntese e
degrada{\c{c}}{\~a}o biol{\'o}gicas de mat{\'e}ria
org{\^a}nica (i.e., metabolismo) nas {\'a}guas costeiras
tropicais. No entanto, a escassez de dados sobre a
varia{\c{c}}{\~a}o nictemeral dos principais gases
metab{\'o}licos (i.e., oxig{\^e}nio -O2 - e di{\'o}xido de
carbono -CO2 -) ainda restringe nossa compreens{\~a}o sobre a
ciclagem de carbono (C) nesses ecossistemas quentes altamente
produtivos, especialmente em condi{\c{c}}{\~o}es
eutr{\'o}ficas. O objetivo do presente estudo foi analisar a
varia{\c{c}}{\~a}o nictemeral da press{\~a}o parcial de ambos
os gases metab{\'o}licos (pO2 e pCO2 ), bem como de
par{\^a}metros f{\'{\i}}sico-qu{\'{\i}}micos da {\'a}gua ao
longo do inverno de 2018 em uma praia de ba{\'{\i}}a tropical
altamente eutrofizada (Ba{\'{\i}}a de Guanabara, regi{\~a}o
metropolitana do Rio de Janeiro, Brasil), no {\^a}mbito dos
primeiros resultados do Biomonitoramento Cont{\'{\i}}nuo de
{\'A}guas do Programa Ecol{\'o}gico de Longa Dura{\c{c}}{\~a}o
da Ba{\'{\i}}a de Guanabara (BiCA/PELD-Guanabara). Os resultados
indicaram intensas altern{\^a}ncias de supersatura{\c{c}}{\~a}o
e subsatura{\c{c}}{\~a}o de CO2 entre os per{\'{\i}}odos
noturno e diurno respectivamente, bem como o oposto para O2 .
Al{\'e}m disso, a rela{\c{c}}{\~a}o negativa de CO2 e
temperatura da {\'a}gua foi muito superior {\`a} esperada por
processos f{\'{\i}}sico-qu{\'{\i}}micos, confirmando a
predomin{\^a}ncia de controles biol{\'o}gicos sobre CO2 ,
acidifica{\c{c}}{\~a}o e hip{\'o}xia nas {\'a}guas costeiras
eutr{\'o}ficas superficiais. No entanto, decl{\'{\i}}nios
matinais de CO2 acompanhando aumentos de temperatura n{\~a}o
foram observados em todos os meses, tamb{\'e}m revelando o papel
da pluviosidade sobre a mediana di{\'a}ria de pCO2 ,
provavelmente devido {\`a} redu{\c{c}}{\~a}o de
radia{\c{c}}{\~a}o solar aos aut{\'o}trofos e incrementos de
substratos org{\^a}nicos aos heter{\'o}trofos ou aportes
al{\'o}ctones desse g{\'a}s. Como conclus{\~a}o, intensas
varia{\c{c}}{\~o}es de curto prazo em gases metab{\'o}licos
podem apresentar profundas implica{\c{c}}{\~o}es ao
balan{\c{c}}o de C nas {\'a}guas costeiras tropicais
eutr{\'o}ficas, um componente das mudan{\c{c}}as globais que
deveria ser melhor avaliado em programas de monitoramento.
ABSTRACT: Growing evidence indicates important global change
consequences related to eutrophication, hypoxia, acidification and
the balance of gases involved in the biological synthesis and
degradation of organic matter (i.e., metabolism) in tropical
coastal waters. However, the scarcity of data on within-day
variation in main metabolic gases (i.e., oxygen -O2 - and carbon
dioxide -CO2 -) still constrains our understanding of carbon (C)
cycling in these highly productive warm ecosystems, especially at
eutrophic conditions. Here, the aim was to assess the within-day
variation of the partial pressure of both metabolic gases (pO2 and
pCO2 ) associated to water physico-chemical parameters over the
winter of 2018 in a beach of highly eutrophic tropical bay
(Guanabara Bay, metropolitan region of Rio de Janeiro, Brazil),
within the scope of the first results of the Continuous
Biomonitoring of Waters of the Long-term Ecological Research
Program in the Guanabara Bay (BiCA/PELDGuanabara, acronym in
Portuguese). As a result, intense shifts of supersaturation and
undersaturation of CO2 between nocturnal and diurnal periods
respectively, and the opposite for O2 were observed. In addition,
the negative relationship of CO2 and water temperature was much
higher than that expected by physical-chemical processes,
confirming the predominance of biological controls on pCO2 ,
acidification and hypoxia in surface eutrophic waters. However,
morning declines in pCO2 with increasing temperature were not
observed in all months, also revealing the role of rainfall on
daily medians of pCO2 , likely due to decreased solar radiation to
autotrophs and increased terrestrial organic substrates to
heterotrophs or the allochthonous CO2 contributions. In
conclusion, strong short-term variations in metabolic gases may
have profound implications for C balance in eutrophic tropical
coastal waters, a component of global change that should be better
assessed in monitoring programs.",
doi = "10.4257/oeco.2020.2402.10",
url = "http://dx.doi.org/10.4257/oeco.2020.2402.10",
issn = "2177-6199",
language = "pt",
targetfile = "28711-94845-1-PB.pdf",
urlaccessdate = "27 abr. 2024"
}