Effects of seasonality, trophic state and landscape properties on CO2 saturation in low-latitude lakes and reservoirs

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dc.contributor.authorJunger, Pedro Ciarlini
dc.contributor.authorDantas, Fabíola da Costa Catombé
dc.contributor.authorNobre, Regina Lucia Guimarães
dc.contributor.authorKosten, Sarian
dc.contributor.authorVenticinque, Eduardo Martins
dc.contributor.authorAraújo, Fernando de Carvalho
dc.contributor.authorSarmento, Hugo
dc.contributor.authorAngelini, Ronaldo
dc.contributor.authorTerra, Iagê
dc.contributor.authorGaudêncio, Andrievisk
dc.contributor.authorThey, Ng Haig
dc.contributor.authorBecker, Vanessa
dc.contributor.authorCabral, Camila Rodrigues
dc.contributor.authorQuesado, Letícia
dc.contributor.authorCarneiro, Luciana Silva
dc.contributor.authorCaliman, Adriano
dc.contributor.authorAmado, André Megali
dc.date.accessioned2020-11-12T00:03:56Z
dc.date.available2020-11-12T00:03:56Z
dc.date.issued2019-05
dc.description.resumoThe role of tropical lakes and reservoirs in the global carbon cycle has received increasing attention in the past decade, but our understanding of its variability is still limited. The metabolism of tropical systems may differ profoundly from temperate systems due to the higher temperatures and wider variations in precipitation. Here, we investigated the spatial and temporal patterns of the variability in the partial pressure of carbon dioxide (pCO2) and its drivers in a set of 102 low-latitude lakes and reservoirs that encompass wide gradients of precipitation, productivity and landscape properties (lake area, perimeter-to-area ratio, catchment size, catchment area-to-lake area ratio, and types of catchment land use). We used multiple regressions and structural equation modeling (SEM) to determine the direct and indirect effects of the main in-lake variables and landscape properties on the water pCO2 variance. We found that these systems were mostly supersaturated with CO2 (92% spatially and 72% seasonally) regardless of their trophic status and landscape properties. The pCO2 values (9–40,020 μatm) were within the range found in tropical ecosystems, and higher (p < 0.005) than pCO2 values recorded from high-latitude ecosystems. Water volume had a negative effect on the trophic state (r = −0.63), which mediated a positive indirect effect on pCO2 (r = 0.4), representing an important negative feedback in the context of climate change-driven reduction in precipitation. Our results demonstrated that precipitation drives the pCO2 seasonal variability, with significantly higher pCO2 during the rainy season (F = 16.67; p < 0.001), due to two potential main mechanisms: (1) phytoplankton dilution and (2) increasing inputs of terrestrial CO2 from the catchment. We conclude that at low latitudes, precipitation is a major climatic driver of pCO2 variability by influencing volume variations and linking lentic ecosystems to their catchmentspt_BR
dc.identifier.citationJUNGER, Pedro Ciarlini; DANTAS, Fabíola da Costa Catombé; NOBRE, Regina Lucia Guimarães; KOSTEN, Sarian; VENTICINQUE, Eduardo Martins; ARAðJO, Fernando de Carvalho; SARMENTO, Hugo; ANGELINI, Ronaldo; TERRA, Iagê; GAUDÊNCIO, Andrievisk. Effects of seasonality, trophic state and landscape properties on CO2 saturation in low-latitude lakes and reservoirs. Science of The Total Environment, [S.L.], v. 664, p. 283-295, maio 2019. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0048969719302657. Acesso em: 04 nov. 2020. https://doi.org/10.1016/j.scitotenv.2019.01.273pt_BR
dc.identifier.doi10.1016/j.scitotenv.2019.01.273
dc.identifier.issn0048-9697
dc.identifier.issn1879-1026
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/30569
dc.languageenpt_BR
dc.publisherElsevierpt_BR
dc.rightsAttribution 3.0 Brazil*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/br/*
dc.subjectCarbon cyclept_BR
dc.subjectEutrophicationpt_BR
dc.subjectShallow lakespt_BR
dc.subjectPrecipitationpt_BR
dc.subjectLand-water couplingpt_BR
dc.subjectEcosystem metabolismpt_BR
dc.titleEffects of seasonality, trophic state and landscape properties on CO2 saturation in low-latitude lakes and reservoirspt_BR
dc.typearticlept_BR

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