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Shumilin, Evgueni; Калмыков, С. Н.; Sapozhnikov, Dmitry; Nava-Sánchez, Enrique H.; Gorsline, Donn S.; Godínez-Orta, Lucio; Sapozhnikov, Yu. A.; Quiñones, Oscar; Castañeda, Abel

doi:10.1023/a:1006728604262

Cited by 17 publications

(4 citation statements)

References 6 publications

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Section: Discussionmentioning

confidence: 99%

“…In general, zooplankton biomass in BLP showed increases (>300 mL 100 m −3 of filtered water) in winter (January or February) and maximum values (>500 mL) in spring [21,60]. Zooplankton biomass ranged from 50 to 1000 mL, and values between 100 and 450 mL were more frequent, with averages between 146-829 mL from winter to spring, with maximum values observed in February, May, and June (556, 829, and 553 mL, respectively) [21,60]. In summer, even when biomass decreased (<200 mL), increases of around 300 mL were observed in July [21,60], and similar values inside and outside a cyclonic vortex (500 mL) were observed in Cuenca Alfonso, while decreases in biomass (130 mL) were observed in the southern portion of the bay in June [57].…”

Section: Discussionmentioning

confidence: 99%

“…Zooplankton biomass ranged from 50 to 1000 mL, and values between 100 and 450 mL were more frequent, with averages between 146-829 mL from winter to spring, with maximum values observed in February, May, and June (556, 829, and 553 mL, respectively) [21,60]. In summer, even when biomass decreased (<200 mL), increases of around 300 mL were observed in July [21,60], and similar values inside and outside a cyclonic vortex (500 mL) were observed in Cuenca Alfonso, while decreases in biomass (130 mL) were observed in the southern portion of the bay in June [57]. Increased zooplankton biomass during the warm season and subsequent grazing may have decreased phytoplankton biomass in BLP [61].…”

Section: Discussionmentioning

confidence: 99%

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Variability of Net Primary Productivity and Associated Biophysical Drivers in Bahía de La Paz (Mexico)

et al. 2021

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The use of information of net primary productivity (NPP) from remote ocean color sensors is increasingly common in marine sciences. The resulting information has been used to explain variations in productivity at different spatio-temporal scales and in the presence of climate phenomena, such as the El Niño Southern Oscillation, and global warming. Satellite remote sensing data were analyzed in Bahía de La Paz (BLP), Mexico, to determine the spatio-temporal variation in NPP. In addition, in situ hydrographic data were obtained to characterize the water properties in the bay. The satellite data agree with in situ measurements, validating the satellite observations over this region. The NPP generally presented seasonal variation with maximum values in winter-spring and minimum values in summer–autumn. The variance explained by NPP from the measured variables was ranked as Chl-a < DEN < SST < PAR < WSC. The highest NPP values generally occurred when subtropical subsurface (SsStW) water was relatively shallow. Due to divergence and mixing processes, this water provided nutrients to the euphotic zone, and consequently an increase in NPP and changes in plankton biomass were observed. The annual trends of the variation in hydrographic data with respect to that of remote sensing data were similar; however, it is necessary to increase the number of data validation studies. The remote sensing and in situ measurements allowed for the main biophysical variables that modulate NPP in different time scales to be identified. The satellite-derived NPP data classifies the BLP as a high productivity zone with 432 g C m−2 year−1. The use of satellite NPP data is satisfactory and should be incorporated into marine primary productivity studies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Variability of Net Primary Productivity and Associated Biophysical Drivers in Bahía de La Paz (Mexico)

et al. 2021

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“…A análise dos dados referentes à concentração de minerais na alface foi feita utilizando a distribuição logarítmica para suavizar a concentração de diferentes elementos [9][10][11] . Como era de se esperar, percebe-se que o fator de umidade é negativamente correlacionado à concentração dos minerais, exceto Cr, que apresentou baixa correlação (0,406).…”

Section: Análise Dos Dadosunclassified

Estudo da biodisponibilidade de metais nos sedimentos da Lagoa da Pampulha

et al. 2004

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Recebido em 18/3/03; aceito em 29/9/03 STUDY OF THE BIOAVAILABILITY OF METALS IN THE SEDIMENTS OF LAGOA DA PAMPULHA (PAMPULHA LAKE). The presence of metals in the sediments of Pampulha Lake was investigated in order to determine the bioavailability of metals in these sediments for the cultivation of vegetables such as lettuce. The chemical analyses of metals and As were accomplished by the k 0 neutron activation technique. The plans for recovering this lake foresee the removal of the deposited sediments and transport of the discarded material to a specific area after the dam. The present study suggests that this strategy of discarding sediments doesn't imply any risk for the local population, in relation to the bioavailability of metals in these sediments.Keywords: bioavailability; neutron activation analysis; lake sediment. INTRODUÇÃOA bacia hidrográfica da Pampulha, situada em Belo Horizonte, MG, é parte do rio das Velhas, sendo a superfície a montante da represa aproximadamente de 97 km 2 1 . A partir do início dos anos 70, a lagoa vem sofrendo processo de assoreamento e poluição de suas águas e sedimentos, com o incremento da ocupação desordenada da bacia hidrográfica a montante. Isto tem trazido inúmeros transtornos à população, como a proliferação de insetos na região, o impedimento da utilização adequada da represa como área de lazer, a ocorrência de enchentes e a perda da identidade do complexo da lagoa.Com a descaracterização, o volume de água, segundo estudos batimétricos realizados pelo CDTN/CNEN em 1999, era de 8.480.000 m 3 , isto é, 50% de seu volume original (18.000.000 m 3 ), o espelho d'água encontra-se reduzido a apenas 66,7% do seu valor inicial 2 . O poder público vem atuando no sentido de recuperar o local para as finalidades para as quais foi construído: área de lazer e, também, amortecimento de cheias na bacia. Esta recuperação está sendo feita através do projeto PROPAM (Programa de Recuperação e Desenvolvimento Ambiental da Lagoa da Pampulha) com o saneamento das águas afluentes.Com a retirada progressiva dos sedimentos, a capacidade do reservatório é aumentada, melhorando a laminação e o amortecimento das cheias. A tendência futura na bacia hidrográfica é de ocorrência de cheias maiores, considerando a mesma precipitação pluviométrica, em função do aumento da impermeabilização de sua superfície, pela ocupação urbana 3 . O desassoreamento da Lagoa da Pampulha tem, como alternativa mais viável, sob o ponto de vista técnico e econômico, a remoção dos sedimentos ali depositados, através da utilização de draga de sucção e recalque, e a adução deste material, através de tubulação, para áreas de bota-fora a jusante da represa (Dragagem de Longa Distância -DLD), sendo aproveitado o grande desnível (125 m/17,8 km) entre o espelho d'água e a confluência com o Rio das Velhas 3,4 .Neste processo, a fração arenosa poderá ser reaproveitada para utilização em construção civil (aterros, material de base para ruas e capas asfálticas e outros). A silto-argilosa (cerca de 70%) deverá ser preferencialmente ...

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