Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

Barroso, Hortência de Sousa; Becker, Helena; Melo, Vânia Maria Maciel

doi:10.1590/s1679-87592016101406401

Cited by 29 publications

(11 citation statements)

References 37 publications

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“…In these cases, high salinities may also adversely affect the activity of different iron-oxidizing bacteria and the Fe(II) oxidation enzymes (see Bongoua-Devisme et al 2012;Sadeghieh et al 2020). This reasoning is supported by the results of a recent study in several Brazilian semiarid mangrove forests which evidenced sharp increase in salinities (2 psu to 37 psu; Barroso et al, 2016) from the rainy season to the dry season.…”

Section: Iron Biogeochemistry In Northeast Mangrovesmentioning

confidence: 85%

Windsock behavior: climatic control on iron biogeochemistry in tropical mangroves

et al. 2021

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Iron is one of the most abundant elements on the planet and a micronutrient for most organisms. In many coastal regions worldwide, mangrove forests affect the dynamics and mobility of different elements to the oceans especially through their soils. The biogeochemistry of mangrove soils responds to numerous factors that vary within different spatial and time scales. In this sense, seasonality can be crucial in determining the role of these ecosystems towards the iron biogeochemical cycle. Thus, the main goal of the present study was to assess the effects of contrasting climatic conditions on iron biogeochemistry in different mangrove forests along the Brazilian coast. We studied the soils (n = 435) of 14 different mangrove forests distributed along two contrasting climate regions: the semi-arid Northeast and the humid Southeast coasts of Brazil. In the SE region, water surplus and lower temperatures in both seasons did not cause significant changes in iron concentrations (wet season: 216 lmol g -1 ; dry season: 230 lmol g -1 ) where oxyhydroxides and pyrite immobilize iron in the mangrove soils. In contrast, in the semi-arid mangroves, a marked water deficit during the dry season caused both pyrite oxidation and iron reprecipitation as oxyhydroxides. Contrarily,

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Section: Iron Biogeochemistry In Northeast Mangrovesmentioning

confidence: 85%

Windsock behavior: climatic control on iron biogeochemistry in tropical mangroves

et al. 2021

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“…However, the short rainy season has a highly variable intensity, influenced by the temperatures in the Atlantic Ocean. The countryside of Ceará is a semi-arid region, with rainfall intensity decreasing each year and temperatures reaching 40°C ( Barroso et al 2016 ). Therefore, the building of dams for water storage is common.…”

Section: Discussionmentioning

confidence: 99%

Natural environmental water sources in endemic regions of northeastern Brazil are potential reservoirs of viable Mycobacterium leprae

Arraes

Holanda

Lima

et al. 2017

Mem. Inst. Oswaldo Cruz

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BACKGROUNDThe detection of live Mycobacterium leprae in soil and animals other than humans suggests that the environment plays a role in the transmission of leprosy.OBJECTIVEThe objective of this study was to investigate the presence of viable M. leprae in natural water sources used by the local population in five municipalities in the state of Ceará, northeastern Brazil.METHODSSamples were collected from 30 different sources. Viable bacilli were identified by reverse transcriptase polymerase chain reaction (PCR) of the M. leprae gyrA gene and sequencing of the PCR products. Physicochemical properties of each water source were also assessed.FINDINGS M. leprae gyrA mRNA was found in 23 (76.7%) of the water sources. No association was found between depth of the water and sample positivity, nor was there any association between the type of water used by the population and sample positivity. An association between viable M. leprae and temperature and pH was found. Georeferencing showed a relation between the residences of leprosy cases and water source containing the bacterium.MAIN CONCLUSIONSThe finding of viable M. leprae in natural water sources associated with human contact suggests that the environment plays an important role in maintaining endemic leprosy in the study region.

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“…Menurut Putri dan Sari (2015), distribusi horisontal nitrat dan fosfat di permukaan perairan menunjukkan nilai yang tinggi pada perairan yang dekat dengan pantai dan mengalami penurunan seiring menuju ke arah laut. Barroso et al, (2016), umumnya aliran air tawar membawa nutrisi ke muara dan akibatnya meningkatkan konsentrasi nutrien.…”

Section: Hasil Dan Pembahasanunclassified

Analisis Sebaran Horizontal Dan Temporal Klorofil-a Dan Fitoplankton Di Muara Sungai Banjir Kanal Barat, Semarang

2020

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Perairan muara sungai Banjir Kanal Barat merupakan salah satu perairan yang penting untuk menopang kehidupan organisme didalamnya, serta penting bagi ekonomi masyarakat kota Semarang. Tujuan penelitian ini adalah mengetahui pola sebaran klorofil-a dan fitoplankton, mengetahui hubungan klorofil-a, nitrat, dan fosfat dengan fitoplankton serta mengetahui tingkat saprobitas perairan sebagai indikator tingkat pencemaran. Penelitian dilaksanakan pada bulan April 2019 di muara sungai Banjir Kanal Barat, Semarang. Pengambilan sampel air dilakukan pada saat kondisi pasang dan surut dengan teknik purposive sampling. Pengambilan sampel fitoplankton dengan metode pasif. Analisis data dengan metode T test, regresi polinomal dan PCA. Analisis status perairan dengan indeks saprobitas dan tropik saprobik indeks. Hasil penelitian ini adalah konsentrasi klorofil-a saat pasang berkisar 0,016 – 2,394 mg/m3 sedangkan saat surut berkisar 0,102 – 1,051 mg/m3. Kelimpahan fitoplankton saat pasang yaitu 33 – 127 sel/l, sedangkan kelimpahan fitoplankton saat surut berkisar antara 18 – 200 sel/l. Sebaran horizontal klorofil-a dan fitoplankton pada saat pasang maupun surut lebih tinggi pada lokasi sungai dan muara dan berkurang pada lepas pantai. Hubungan yang kuat dari analisa regresi polinomial dan PCA yaitu pada fitoplankton dengan nitrat saat pasang serta klorofil-a dengan nitrat saat surut. Nilai SI pada saat pasang menunjukkan β-mesosaprobik dan saat surut oligosaprobik. Nilai TSI pada saat pasang dan surut menunjukkan oligosaprobik.

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Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

Cited by 29 publications

References 37 publications

Windsock behavior: climatic control on iron biogeochemistry in tropical mangroves

Windsock behavior: climatic control on iron biogeochemistry in tropical mangroves

Natural environmental water sources in endemic regions of northeastern Brazil are potential reservoirs of viable Mycobacterium leprae

Analisis Sebaran Horizontal Dan Temporal Klorofil-a Dan Fitoplankton Di Muara Sungai Banjir Kanal Barat, Semarang

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