Qual Índice de Diversidade Usar?

Lima, Mauro Sérgio Cruz Souza; Souza, Carlos Albertos dos Santos; Pederassi, Jonas

doi:10.47385/cadunifoa.v11.n30.406

Cited by 6 publications

(4 citation statements)

References 18 publications

(33 reference statements)

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“…A exceção foram os valores encontrados para riqueza de Margalef, visto que os maiores valores e diferenças entre viveiros foram observados em outubro. Este índice apresenta maior facilidade operacional já que considera que todas espécies estão uniformemente distribuídas (Lima et al, 2016), por isso é possível que o maior número de táxons encontrados em V1 em outubro em relação aos demais meses tenha proporcionado este resultado. A maior abundância e diversidade de táxons na estação chuvosa tem sido demonstrada por alguns estudos (Callisto et al, 2001;Martini et al, 2013), onde possivelmente foi decorrente das melhores condições proporcionadas pelo aumento do volume de água.…”

Section: Discussionunclassified

Avaliação de Macroinvertebrados Bentônicos em Viveiros Escavados em Londrina-PR.

Souza¹,

Lima²,

Leite³

et al. 2020

Braz. J. Aquat. Sci. Technol.

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Biomonitoring with the use of benthic macroinvertebrates has been an effective tool used to evaluate water quality in several water bodies. In this context, there are several factors that can act on the structure of macroinvertebrate commuinities, with indications of the influence of aquaculture. Therefore, the present study evaluated the composition of macroinvertebrate populations in two earthen ponds of a fish farm in Londrina-PR. Three collections were carried out: in October of 2015 and February and July of 2016, with the use of artificial biocolectors. The macroinvertebrates were quantified and identified, and diversity indexes were calculated with the data obtained. Higher number of taxa, higher number of individuals and greater diversity and uniformity in macroinvertebrate communities were found in pond 1 (water entrance), due mainly to the presence of taxa tolerant or resistant to organic pollution, which may be related to the higher concentration of nutrients and organic matter in this pond. However, in pond 2 (water outlet), individuals of Polycentropodidae (Trichoptera) were found in all collections, in addition to a low abundance of taxa that would indicate organic enrichment, demonstrating better water quality. Furthermore, greater abundance and diversity were observed in the months with higher level of precipitation. From the perspective of aquaculture, the results found in pond 1 can be used as indicative of greater productive potential, however, the low frequency of taxa typical of clean environments may indicate low oxygen levels.These results demonstrate that the position of the pond relative to the water source in a fish farm can influence the water quality, which can be verified through the structure of the benthic macroinvertebrates communities.

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Section: Discussionunclassified

Avaliação de Macroinvertebrados Bentônicos em Viveiros Escavados em Londrina-PR.

Souza¹,

Lima²,

Leite³

et al. 2020

Braz. J. Aquat. Sci. Technol.

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“…Other studies also show the Margalef richness index as more sensitive in the expression of diversity [65,66], however, its weak point is to consider that all species are uniformly distributed [67], which is not true for many environments, so it is important that other analyzes accompany the studies of the communities, such as the application of the diversity (H'), dominance (D) and equitability (J') indexes, which allow inferring the level of organization of the populations, through the analysis of patterns of distribution of individuals in the environment. In addition, the richness index (Dα) does not give weight to the species, where frequent and rare species have the same value, while the diversity and dominance indexes employ weight for the occurrence of these species, for example, the diversity index (H') deposits intermediate weight to rare species, whereas the dominance index (D) employs minimum weight [68].…”

Section: Ecological Indexes Analysismentioning

confidence: 99%

Ecological indexes and phytoplankton structure of urban reservoirs supplied by estuarine waters and under the effects of seasonality (Belém, Pará, Brazil)

Brito Pires,

Garcia Díaz,

Brabo de Sousa

et al. 2023

Sci. Plena

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Ecological indices are used in the study of phytoplankton because they are related to their productivity and can describe the stresses caused by anthropogenic impacts on the aquatic environment. The aim of this study was to evaluate the phytoplankton structure and the application of ecological indices in the monitoring of water quality in public supply reservoirs in Belém (Pará). Monthly sampling occurred in four stations in the Bologna and Água Preta reservoirs from January to October/2019, to determine the abiotic and biotic factors and the calculation of ecological indices. Turbidity, transparency, precipitation and dissolved oxygen were the main abiotic variables that differentiated the reservoirs, evidencing the estuarine, seasonal and anthropogenic influence on species distribution. A total of 187 phytoplankton species were identified with representation of diatoms. In January, Água Preta reservoir presented lower diversity (2.14 ± 0.58 nats.ind-1), equitability (0.57 ± 0.14) and higher dominance (0.25 ± 0.19) with the species Trachelomonas volvocina in higher density, contrary to June that presented higher diversity and equitability and no species dominance. The Bolonha reservoir showed lower richness (8.3 ± 1.9), diversity (1.2 ± 0.5 nats.ind-1) and equitability (0.32 ± 0.12) with dominance of the species Gonyostomum sp. (0.55 ± 0.19). In this sense, the Água Preta reservoir was considered diverse with species well distributed in the environment, while the Bolonha reservoir showed low diversity and dominance of a phytoplankton species. Ecological indices describe well the spatio-temporal variation of phytoplankton in these reservoirs and are a good approach in monitoring environmental quality.

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“…Local population diversity indices, also called α (alpha) diversity measures, are obtained from mathematical expressions. The most used in microbial ecology studies are the Shannon and Simpson indices (Lima et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The Shannon index (H') assumes that, during random sampling for an in nite community, all species are sampled (Lima et al 2016). This index usually varies between the ranges of 1.5 to 3.5, reaching values above 4.0 when the sample size is high.…”

Section: Introductionmentioning

confidence: 99%

Microbiological Characterization of Biofilm From Different Immobilization Structures Used in Submersed Aerobic Biofilters in Domestic Effluent Treatment at the City of Joinville, Brazil

Damasceno,

Lafratta,

Valentina

et al. 2023

Preprint

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The objective of this work was to develop a structure for microbiological immobilization, in polymeric material of low environmental impact associated with its production, being used as support material in a biofiltration unit of domestic effluents, capable of promoting the efficient removal of pollutants, to meet with Brazilian legislation and/or regulations for the disposal and/or reuse of effluents. Four different structures were tested, namely: polypropylene casings without filling material (TF1); polypropylene casings, filled with expanded polystyrene grains (TF2); polypropylene casings, filled with polyurethane foam (TF3); polypropylene casings, filled with polyvinyl chloride pellets (TF4). A flow of 0.216 m3.d-1 was applied to the system, and the biofilters operated in sequential batches with a hydraulic retention time of 6 hours. The efficiency potential of the four immobilization structures was verified regarding the parameters biochemical oxygen demand, chemical oxygen demand, total ammoniacal nitrogen and total phosphorus. The microbiological analysis of the formed biofilm, performed with the 16S library sequencing method, with amplification of the 16S rRNA V3 and V3-V4 genomic regions, showed a high diversity of microbiological colonization in the four immobilization structures, linking better results and consequently greater Community stability in TF2. It is recommended to use the filter bed made up of unfilled casings, followed by the filter bed made up of casings filled with expanded polystyrene grains.

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Qual Índice de Diversidade Usar?

Cited by 6 publications

References 18 publications

Avaliação de Macroinvertebrados Bentônicos em Viveiros Escavados em Londrina-PR.

Avaliação de Macroinvertebrados Bentônicos em Viveiros Escavados em Londrina-PR.

Ecological indexes and phytoplankton structure of urban reservoirs supplied by estuarine waters and under the effects of seasonality (Belém, Pará, Brazil)

Microbiological Characterization of Biofilm From Different Immobilization Structures Used in Submersed Aerobic Biofilters in Domestic Effluent Treatment at the City of Joinville, Brazil

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