Integridade ambiental da represa de Jurumirim: ictiofauna e relações ecológicas

Silva, Reinaldo José da

doi:10.7476/9788568334782

Cited by 2 publications

(1 citation statement)

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“…The urban character of the river determined the predominance of autochthonous items, which limits and drastically reduces the availability of allochthonous items coming from the riparian forest, which has been significantly altered in the studied stretch. The results show that among the six trophic categories commonly found in freshwater courses, most of the representative trophic groups are present in the studied river (four categories), suggesting environmental changes (Souto et al, 2016), since the abundance trophic guilds is very dependent on environmental conditions (Vidotto-Magnoni and Carvalho, 2009). The trophic change observed in the present study from the rainy season to the dry season was the result of the greater supply of autochthonous food in the rainy season, which favored greater specialization in the species diet (Junk and Wantzen, 2004) which emphasized that hydrological changes affect not only the quantity, but also the quality of the food.…”

Section: Discussionmentioning

confidence: 87%

Food ecology and presence of microplastic in the stomach content of neotropical fish in an urban river of the upper Paraná River Basin

Oliveira¹,

Corrêa²,

Smith³

2020

Rev. ambiente água

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Plastic is a useful material; but along with its benefits also come several disadvantages. One of these is the consequences of the improper discarding of plastic in the environment and its eventual fragmentation into microplastics. Plastic can reach rivers and affect their biota as microparticles from its degradation. The entry of plastic into the food chain occurs by the consumption of fish or other organisms. Furthermore, persistent organic pollutants can accumulate, and the consumption of materials containing plastic pollutants can cause several physiological problems in animals. Such pollutants can reach man when water or fish is consumed. There are numerous studies in the marine environment that show that microplastics significantly interfere with marine biota; but there are relatively few studies addressing this topic in freshwater environments. This work characterized the diet of the most abundant fish species in an urban river of the Upper Paraná Brazil Watershed, investigating the occurrence of microplastic. As much as the studied river suffers from urban river syndrome, a wide variety of food consumed by fish was found. The stomach content of 220 individuals belonging to fourteen species was analyzed. In the stomach content analysis, 16 types of food items were found, most of them autochthonous. The species analyzed were grouped into four trophic categories, with iliophage as dominant one. The presence of microplastics was found in 2% of the studied individuals, two individuals of the species Rhamdia quelen, one specimen of Hoplosternum littorale and one specimen of Astyanax fasciatus.

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Section: Discussionmentioning

confidence: 87%