How does the phytoplankton community respond to the effects of La Niña and post-drought events in a tide-dominated Amazon estuary?

Oliveira, Antonio Rafael Gomes de; Queiroz, Jislene Brito Matos; Pardal, Emarielle Coelho; Pereira, Luci Cajueiro Carneiro; Costa, Rauquı́rio Marinho da

doi:10.1007/s00027-022-00904-0

Cited by 7 publications

(2 citation statements)

References 97 publications

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“…Já a temperatura (r = -0.7170) agrupou as amostras do período seco. Esta predominância de espécies marinhas eurialinas, em especial de espécies neríticas foi observada por Sousa et al (2008), Gama et al (2011 e Matos et al (2012;2016b, 2016a , 1998;Sousa et al, 2009;Sousa et al, 2013;Matos, et al, 2016a;Barros et al, 2019;Oliveira et al, 2022;Oliveira et al, 2023).…”

Section: Análise De Correspondência Canônica (Acc)unclassified

Fitoplâncton do estuário do Emboraí Velho (Nova Olinda - PA)

Neto¹,

Costa²,

Silva³

et al. 2023

OLEL

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Este estudo avaliou o efeito da sazonalidade sobre as características hidrológicas e a dinâmica do fitoplâncton no estuário do Emboraí Velho. Foram realizadas coletas nictimerais em duas estações fixas durante marés de sizígia em quatro meses de 2018. As variáveis hidrológicas foram determinadas através de CTDO’s e da análise de amostras de água coletadas com garrafas de Niskin. O fitoplâncton foi coletado com redes cônicas de plâncton (64 µm) e com garrafas de Niskin (estudo quantitativo). Os resultados mostraram variações sazonais nas variáveis hidrológicas. Foram identificados 189 táxons, sendo as diatomáceas as mais abundantes e frequentes. A densidade fitoplanctônica e a biomassa (clorofila-a) variaram sazonalmente, com valores mais elevados no período seco e chuvoso, respectivamente. A análise de correspondência canônica (ACC) mostrou a existência de dois grupos sazonais distintos, demostrando a influência da pluviosidade sobre a hidrodrologia e a dinâmica da comunidade fitoplanctônica local.

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Section: Análise De Correspondência Canônica (Acc)unclassified

Fitoplâncton do estuário do Emboraí Velho (Nova Olinda - PA)

Neto¹,

Costa²,

Silva³

et al. 2023

OLEL

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“…These processes may result in variations in the trophic status and salinity of the estuary, as observed at a number of locations, worldwide (Garcia-Rodriguez et al, 2013; Thompson et al, 2015). In the Amazon region, drought events make estuarine waters more saline, and result in a reduction in dissolved nutrient and chlorophyll a concentrations (Pereira et al, 2017;Costa et al, 2022;Oliveira et al, 2023;Procopio et al, 2024), whereas during periods of abnormally high rainfall, salinity declines, and the water becomes richer in dissolved inorganic nutrients and phytoplankton biomass (Pereira et al, 2013;Andrade et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effects of climate events on the trophic status of an Amazonian estuary

Monteiro,

Pereira,

Costa

2024

Preprint

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In recent years, climate events such as Drought, El Niño, and La Niña have become increasingly frequent and more intense. Oceanographic monitoring was used to collect hydrological data in the middle and lower sectors of the Caeté estuary in different years. Negative rainfall anomalies of up to 45% were recorded during periods marked by Drought and El Niño events, which make the water of the Caeté estuary more saline and alkaline. During these events, the retention of dissolved inorganic nutrients in the middle sector appear to support increased eutrophication and more productive waters, whereas moderate eutrophication and lower productivity were observed in the lower sector. During the La Niña events, by contrast, positive rainfall anomalies may reach 60%, resulting in more oxygenated water in the estuary. In addition, the lower sector tends to more eutrophic during periods of high rainfall and freshwater discharge, as observed in this study during a La Niña event. The paucity of data on the effects of extreme climate events in Amazonian environments means that the findings of the present study may provide a useful model for the assessment of the effects of these events on other natural environments in the Amazon region.

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