Macroinvertebrados acuáticos como indicadores de calidad hídrica en áreas de descargas residuales al río Quevedo, Ecuador

Rosado, Ángel Yépez; Yánez, Ángel Bolívar Yépez; Zambrano, Juan Urdánigo; Cabezas, Diana Carolina Morales; Chuez, Norma María Guerrero; Cajas, Cecilia Carolina TayHing

doi:10.18779/cyt.v10i1.196

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…The Shannon index shows a low value, less than 2, which implies a low biodiversity of macroinvertebrates [35] especially in upstream area, situation that can be explained because generally the headwaters and first sections of the basins have less diversity than the middle of the main river channel [33]. Despite this common low diversity between upstream and downstream areas, the data collected in spring at downstream area showed a significant differences between the other points analyzed, this situation could be explain by the nearness to urbanized territories, influence of residual discharges, less coverage and higher environment impact [36], [32], [37].The richness and diversity show a similar relationship to that of the Shannon index, showing low values, slightly differentiated with greater diversity in downstream area, with a spring effect that increases the difference. Regarding the Pielou index, it shows similar trends to the Shannon index without significant variation as in other studies [38], [39], [40].…”

Section: Macroinvertebrate Communitymentioning

confidence: 99%

Evaluation of Biological and Physicochemical Relationships as Indicators of Water Quality in Toltén River Basin, Araucanía, Chile: Preliminary Results

Guerrero-Jiménez

Rabert

Sáez-Arteaga

et al. 2021

J. Chil. Chem. Soc.

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River basins play a critical role in ecosystem services and their status regulate the associated productivity. Anthropogenic activities along with other environmental perturbation influence the vulnerability level of that important water resource, disturbing in a short time, water quality. The aim of this work is to generate an approach to Toltén basin characterization with benthonic macroinvertebrates, physicochemical and bacterial components as indicators of variation in water quality close to human populations and the sectors furthest from them, selecting for this purpose two areas (up and downstream of the basin). We used an ANOSIM two-way analysis to relate abiotic and biotic data and for diversity and biotic index (ChBMWP) we analyzed the benthic macroinvertebrate composition. A principal component analysis for environmental variables strongly separated the analyzed zones by season as the first principal component, showing a clear increase in temperature and electrical conductivity values in spring season. Meantime the pH parameter was observed with interesting variation for longitudinal gradient with incremental values in upstream area. The biotic indexes applied to the samples between seasons reflexes a similar diversity between analyzed sites in upstream with no differences showing a low diversity of macroinvertebrates. However, a significant increase was detected during spring in downstream zone. On the other hand, Pseudomonas genus increase between the most representative microbiological genera in the basin. Our results reinforce the importance not only of frequent seasonal monitoring program but also the critical role of collecting data on total transect basin length to regulate the human activities associated to basin and to protect the water quality.

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Section: Macroinvertebrate Communitymentioning

confidence: 99%

Evaluation of Biological and Physicochemical Relationships as Indicators of Water Quality in Toltén River Basin, Araucanía, Chile: Preliminary Results

Guerrero-Jiménez

Rabert

Sáez-Arteaga

et al. 2021

J. Chil. Chem. Soc.

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Usefulness of Discriminant Analysis in the Morphometric Differentiation of Six Native Freshwater Species from Ecuador

González

Heredero²,

González

et al. 2021

Animals

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The aim of this research was to find out the morphometric differentiation of six native freshwater species in the Guayas Hydrographic Basin (Ecuador) by means of discriminant analysis. A total of 1355 mature fishes (Cichlasoma festae, Andinoacara rivulatus, Dormitator latifrons, Bryncon dentex, Hoplias microlepis and Leporinus ecuadorensis) were captured and 27 morphometric measurements and 20 landmarks were used. Two-way analysis of variance with species and sex as fixed factors and discriminant analysis were applied. The selection of the most discriminant variables was made applying the F of Snedecor, Wilks’-Lambda and the 1-Tolerance. While sex within species had no significant effect on the morphology, differences among species were significant. Twenty-seven morphological variables showed highly significant differences among six native freshwater species. Nine biometric variables with high discriminant power were selected. The six species analyzed were discriminated by the morphometric models generated, thus showing that discriminant analysis was useful for differentiating species. The morphometric differentiation by discriminant analysis is a direct, simple and economic methodology to be applied in situ in rural communities. It favors the implementation of a livestock development program and it could be used with other native freshwater species in the Guayas Hydrographic Basin.

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Bioindicators of water quality with different riparian cover in the Guapara micro watershed, Ecuador

et al. 2022

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Agricultural activities produce changes in the margins of the stream banks, causing disturbances in water quality, and in the assemblage of aquatic insect communities. The objective of this research is to evaluate the changes in the structure and composition of the aquatic macroinvertebrate community, and physicochemical variables in relation to the land use of the Guapara river, Cotopaxi province, Ecuador. Samplings were conducted during the rainy season (December to February 2018-2019) in three streams with different riparian cover: agricultural, native forest, and forest plantations, where samples of aquatic insects and physicochemical parameters were collected in situ. A total of 461 aquatic insects corresponding to 7 orders and 25 families were collected. In general, the highest abundance in order and family was presented by Ephemeroptera with 34 %, and Leptophlebiidae with 21 % respectively. According to the Ephemeroptera, Plecoptera Trichoptera (EPT) index, the highest ecological condition was found in streams with native forest cover, and forest plantations respectively, and decreased in the stream with agricultural cover; while BMWP-Cr indicated water contamination in the three streams. Hydrobiosidae (Trichoptera) were associated with high turbidity values; while Gerridae (Hemiptera) were associated with high dissolved oxygen concentrations; in addition, Ptilodactylidae (Coleoptera) preferred the Q1-CA, and Q3-CF conditions, while Leptophlebiidae (Ephemeroptera) were associated with the stream of native forest. A negative influence of agricultural activity on the physicochemical parameters of the water and on the structure of the aquatic insect community assemblage was evidenced.

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Macroinvertebrados acuáticos como indicadores de calidad hídrica en áreas de descargas residuales al río Quevedo, Ecuador

Cited by 4 publications

References 9 publications

Evaluation of Biological and Physicochemical Relationships as Indicators of Water Quality in Toltén River Basin, Araucanía, Chile: Preliminary Results

Evaluation of Biological and Physicochemical Relationships as Indicators of Water Quality in Toltén River Basin, Araucanía, Chile: Preliminary Results

Usefulness of Discriminant Analysis in the Morphometric Differentiation of Six Native Freshwater Species from Ecuador

Bioindicators of water quality with different riparian cover in the Guapara micro watershed, Ecuador

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