Avaliação da Atividade Antrópica no Rio Guaraguaçú (Pontal do Paraná, Paraná)

Reis, Camila Salles dos; França, Horrana Thamires da Silva; Motyl, Tanatiana; Cordeiro, Thaís de Souza; Rocha, Jansle Vieira

doi:10.1590/s1413-41522015020000112471

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…Guaraguaçu River is the largest river on the hydrographic basin, with a drainage area of approximately 395.5 km² within the Atlantic Forest (Vitule 2008;Reis et al 2015). Along its course, the Guaraguaçu River flows through several regions of well-preserved forest The invasive tropical tanner grass decreases diversity of the native aquatic macrophyte community at two scales in a subtropical tidal river and conservation units, such as the 'Estação Ecológica do Rio Guaraguaçu' (Vitule 2008;Reis et al 2015). Nevertheless, the river continuously receives untreated domestic effluents from municipalities on the coastal shore of Paraná State (Singo et al 2020).…”

Section: Study Areamentioning

confidence: 99%

“…Tropical tanner grass has intensively invaded the Guaraguaçu River, a subtropical tidal river in the Coastal basin of Paraná State, South Brazil (Reis et al 2015). The environmental changes caused by this invasive species likely impact susceptible native species, such as endemic birds that use native macrophyte species as perches (Reinert et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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The invasive tropical tanner grass decreases diversity of the native aquatic macrophyte community at two scales in a subtropical tidal river

2021

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The tropical tanner grass, Urochloa arrecta, is one of the worst aquatic plant invaders in Brazilian freshwater ecosystems. This study aimed to compare beds of macrophytes dominated and without U. arrecta in the Guaraguaçu River, a subtropical tidal river in South Brazil, to analyze effects that this invasive grass has on the biodiversity of native macrophytes at two spatial scales. We compared macrophyte beds dominated by tanner grass to macrophyte beds without, considering species richness, composition, and beta diversity at two scales of variation: among-beds and within-beds. We expected that beds dominated by tanner grass would have lower biodiversity, thus promoting macrophyte biotic homogenization. Our results confirmed our hypotheses, highlighting the lower species richness in beds dominated by tanner grass. Species composition differed among beds. In general, nestedness among beds dominated by U. arrecta was more related to variation in species composition. Beds dominated by tanner grass had lower turnover and higher nestedness within beds. This study indicates a prominent sign of biotic homogenization promoted by U. arrecta, and highlights the degree of biotic homogenization among and within beds.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The invasive tropical tanner grass decreases diversity of the native aquatic macrophyte community at two scales in a subtropical tidal river

2021

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“…This river is an environment of high biological importance that suffers from great anthropogenic impacts such as overfishing (Lana, Marone, Lopes, & Machado, 2001) introduction of exotic species (Vitule, Umbria, & Aranha, 2006), and the effects of being utilized as a major port area (Caires, Pichler, Spach, & Ignácio, 2007;Contente, Stefanoni & Spach, 2011). In addition to the abovementioned impacts, other common but poorly documented threats for biodiversity and ecosystem functioning are a constant matter for legal contests given the environmental laws (see also Reis, França, Motyl, Cordeiro, & Rocha, 2015), such as plans for a construction of a new port near the mouth of the river, frequent dredging for sand extraction, discharge of untreated domestic sewage and slurry escapes from an overfilled dumping ground (see also Singo, Araújo-Ramos, & Rocha, 2020).…”

Section: Study Sitementioning

confidence: 99%

A checklist of aquatic macrophytes of the Guaraguaçu river basin reveals a target for conservation in the Atlantic rainforest

Araújo

Vitule

Padial

2021

Acta Sci. Biol. Sci.

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Describing and understanding distribution of species in natural ecosystems is the first step to establish conservation efforts. In aquatic habitats, macrophytes play a central role in promoting biodiversity and ecosystem functioning. This study aimed to create the first checklist of aquatic macrophyte species occurring in the Guaraguaçu river, the largest river in Paraná State coast, Brazil. Species herborized, identified and incorporated into the Herbarium collection of the Universidade Federal do Paraná. A total of 47 species were registered corresponding to 37 genera and 29 botanical families; Cyperaceae and Poaceae were the most representative families. In addition, the wide invasion of the non-native species Urochloa arrecta (Hack. ex T. Durand & Schinz) Morrone & Zuloaga was registered and the presence of the floating-leaved non-native species Nymphaea caerulea Savugny was recorded. Even so, the inventory shows a noteworthy richness of aquatic macrophytes species in the Guaraguaçu river, and it is clear macrophyte species reflect a gradient of anthropic impact and salinity in this tidal estuarine river. Our study contributes to the creation of public policies to aid in the protection of this river that represents a central site for biological conservation efforts, yet is constantly threatened by anthropic activities.

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“…In this process, the acid medium allows the reaction between nitrite with sulfanilamide solution's and the naphthyl-1-ethylenediamine dihydrochloride, obtaining a pinky-colored solution. We used the same methodology to quantify the nitrate ion, however, initially, nitrate was reduced to nitrite using metallic zinc, because of this ion does not react with these substances described above (Reis et al 2015). Ammonia quantification was done by the indophenol method (Berthelot's reaction), which consists of the reaction of ammonia with phenolic acid, sodium nitroprusside, sodium dichloroisocyanide dehydrate and sodium hydroxide (Staden & Taljaard, 1997).…”

Section: Spectrophotometric Analysesmentioning

confidence: 99%

Physical-Chemical Characterization of Peri River, Pontal do Paraná, PR, Brazil

Singo¹,

Araújo-Ramos²,

Rocha³

2020

IJAERS

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Rivers always went too utilized for the population's benefits, however, environmental impacts caused by humans have resulted in aquatic ecosystems degradation. This fact decreases biological diversity and impairs water availability. Amongst elements which could be quantified to evaluate the impact caused anthropically are phosphorus and nitrogen since the increase of their levels in rivers could result in artificial eutrophication. Thus, the aim of this work was to evaluate the Peri River (Pontal do Paraná -PR) in a spacetime perspective, between 2018 and 2019. It was measured the pH, dissolved oxygen, electric conductivity, total dissolved solids, turbidity, air and water temperature, phosphorus, nitrate, and ammonium in 8 samples points. The majority of the parameters got compatible values with the established with 357/2005 CONAMA's resolution, even the results of the ammonia ion in May 2019 in the points 1, 2, 3, and 4 have shown high values, likely as consequence as leachate from the dump. The parameter pH in point 8, localized in the river source has shown acid values due to soil leaching or the introduction of chemical substances adjacent to this place. As well as past studies, phosphorus has been showing elevated values, which in this set sample collections, data are 50 folds higher than to the established by the CONAMA's resolution, making the Peri River susceptible to eutrophication and environmental deterioration. We concluded that Peri River has been suffering gradually with anthropic impacts, thus, preventive and palliative actions must be taken immediately against the anthropic actions.

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Avaliação da Atividade Antrópica no Rio Guaraguaçú (Pontal do Paraná, Paraná)

Cited by 5 publications

References 11 publications

The invasive tropical tanner grass decreases diversity of the native aquatic macrophyte community at two scales in a subtropical tidal river

The invasive tropical tanner grass decreases diversity of the native aquatic macrophyte community at two scales in a subtropical tidal river

A checklist of aquatic macrophytes of the Guaraguaçu river basin reveals a target for conservation in the Atlantic rainforest

Physical-Chemical Characterization of Peri River, Pontal do Paraná, PR, Brazil

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