Rendimentos operacionais de barco removedor e escavadeira de braço longo no controle de infestações de plantas aquáticas no reservatório Piraquara II, Paraná, Brasil

Scheer, Maurício Bergamini; Lisboa, Alexandre Moreno; Burda, Tamires Marcela

doi:10.21168/rbrh.v21n2.p328-337

Cited by 3 publications

(3 citation statements)

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“…The macrophytes were removed during August 5-9, 2013 using a Caterpillar 320C 17L/h hydraulic excavator equipped with a long reach boom (15 m); a drain bucket was operated to remove the aquatic macrophytes (see Scheer et al 2016). The transport and disposal of the plant material from the reservoir to other areas nearby were made by two trucks (Mercedes Benz 2423, 6 × 4 traction) with 14 m3 dumping beds.…”

Section: Mechanical Removal Of Macrophytes In Lake Inglesesmentioning

confidence: 99%

“…Several studies have reported significant effects of mitigating and lowering nutrient inputs in reservoirs by regularly removing macrophytes, but this is insufficient to eradicate the problem (Carpenter & Adams 1978;Scheer et al 2016). In contrast, macrophytes should be carefully disposed of to avoid contaminating adjacent water bodies with plant propagules or nutrients (Quilliam et al 2015), as well as to minimize the impact on the indigenous fauna associated with the macrophytes (Booms 1999;Greer et al 2012;James 2013).…”

Section: Introductionmentioning

confidence: 99%

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Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Wojciechowski

Burda²,

Scheer³

et al. 2018

Acta Bot. Bras.

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Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis raciborskii, Pseudanabaena sp., and Geitlerinema sp.) and of colonial chlorophytes were favored after macrophyte removal, while the abundances of diatoms and flagellates decreased. Our results suggest that removing macrophytes causes dramatic changes in phytoplankton composition and biomass and selects for toxigenic species of cyanobacteria. These changes were probably associated with the disturbance caused by removing the macrophytes, which immediately created new environmental conditions prone to species competition. These findings indicate that the use of mechanical techniques to manage macrophytes should be carefully considered, along with monitoring of harmful species and changes of limnological parameters.

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Section: Mechanical Removal Of Macrophytes In Lake Inglesesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Wojciechowski

Burda²,

Scheer³

et al. 2018

Acta Bot. Bras.

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“…The data of operating costs obtained in the literature according to Scheer et al (2016), whose operating capacity measurement consisted of the time for loading of a Mercedes Bens 2423 truck (grouping of partially densified macrophytes in the water body by a C96-4 water dozer CONVER ® mowing boat and removed by a Caterpillar 320C excavator), transport to and from disposal areas, and unloading in them (dumping), were used for the mechanical method.…”

Section: Cost Of Chemical and Mechanical Controlmentioning

confidence: 99%

Efficacy of Imazamox with Centrifugal Energy Spray Nozzle on Eichhornia crassipes and Economic Analysis of Control Viability

et al. 2019

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The efficacy of imazamox to control Eichhornia crassipes with a centrifugal energy spray nozzle at doses and volumes of spray solution and the costs of mechanical and chemical control of aquatic plants were evaluated in this study. Imazamox doses consisted of 200, 400, and 600 g a.i. ha-1, and spray solution volumes consisted of 25, 50, and 100 L ha-1, with a control (without herbicide application) and ten replications. Applications were performed with a centrifugal energy spray nozzle. The evaluations were carried out considering the percentage of control at 7, 15, 21, and 30 days after application (DAA), and plant dry matter was measured at 30 DAA, as well as leaf retention of spray solutions. An efficacy from 96 to 100% and plant dry matter reduction from 88 to 100% was observed at 30 DAA using imazamox doses of 200, 400, and 600 g a.i. ha-1 and a spray solution volume of 50 L ha-1. Imazamox doses and spray solution volumes were effective in controlling E. crassipes, except for 200 g a.i. ha-1 and 25 L ha-1, respectively. The highest leaf retention of E. crassipes was 0.010 mL cm2 at an imazamox dose of 400 g a.i. ha-1 and volume of 50 L ha-1. The cost of chemical control was 20 times lower when compared to mechanical control, making it economically more viable. These results are important for decision-making on which method and application technology should be used to control E. crassipes.

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Surface water quality assessment of the main tributaries in the lower São Francisco River, Sergipe

Britto

Vasco

Netto

et al. 2018

RBRH

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Contamination of water body by diffuse and point sources in springs has caused concerns mainly due to restrictions on its quality. The problem becomes more serious when contamination affects water for human consumption, as occurs in the river São Francisco, which supplies several municipalities of Sergipe. In this sense, the objective of the study was to evaluate water quality in eleven tributaries of the São Francisco river in its low course in the period from 2013 to 2014, in order to subsidize decision making by public management bodies operating in the region. For this purpose, it was used the Water Quality Index (WQI) and the Trophic State Index (TSI), as well the hierarchical grouping techniques associated to the samples to compare the different causes of contamination of each source. The lowest WQI values were observed in the rivers Betume and Jacaré and they were associated with high concentrations of coliforms related to the disposal of domestic effluents from the riverside cities. It was observed a tendency to eutrophication in the Jacaré stream, Santo Antônio, Pilões, Papagaio and Capivara rivers demonstrated by the high TSI in the rainy season. The results of the cluster analysis were close to their Euclidean distance, and showed that there were similarity relationships between the different water sources related to their parameters of water quality. In this piece of work, we also used the Factor Analysis resulted in the selection of five factors of water quality indicators which are mainly related to mineral content, organic matter, surface runoff and the level of pollution. Thus, it is concluded that the water quality of the São Francisco river tributaries is at a strong tendency towards contamination and that its tributaries need a constant monitoring for the environmental management decisions to be the most adequate for the sustainable survival of the riverside communities.

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Rendimentos operacionais de barco removedor e escavadeira de braço longo no controle de infestações de plantas aquáticas no reservatório Piraquara II, Paraná, Brasil

Cited by 3 publications

References 0 publications

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir

Efficacy of Imazamox with Centrifugal Energy Spray Nozzle on Eichhornia crassipes and Economic Analysis of Control Viability

Surface water quality assessment of the main tributaries in the lower São Francisco River, Sergipe

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