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7083244 
Journal Article 
Acanthocephalans parasites of two Characiformes fishes as bioindicators of cadmium contamination in two neotropical rivers in Brazil 
Costa Duarte, GS; Lehun, AL; Rosa Leite, LA; Consolin-Filho, N; Bellay, S; Takemoto, RM; , 
2020 
1 
Science of the Total Environment
ISSN: 0048-9697
EISSN: 1879-1026 
ELSEVIER 
AMSTERDAM 
738 
140339 
English 
32806342 
WOS:000559085400010 
Studies have demonstrated the role of acanthocephalan as environmental bioindicators. The dynamics in the parasite-host relationship that define the patterns of distribution of trace metals in parasites and, in its host, are extremely variable. In addition, the neotropical region, which is a major maintainer of the biodiversity of fish and parasites, remains little explored in this subject. Therefore, our objective was to analyze and compare the concentration of Cadmium (Cd) in the tissues of Prochilodus lineatus and Sertasafmus marginatus collected from Baia and Parana rivers, as well as to assess the use of acanthocephalan as environmental bioindicators of pollution and their Cd bioaccumulation capacity. We collected 53 fish, 20 specimens of Prochilodus lineatus from Parana River and 17 from Baia River, in addition to 16 specimens of Serrasaimus marginatus from Baia River, in September 2017 and March 2018. Tissues of the fish along with their parasites were subjected a Cd concentration analysis by Atomic Absorption Spectroscopy. The results revealed that the parasites had higher concentrations than all the tissues of S. maiginancs, P. lineatus from Baia River and Parana River. The high Cd concentrations in these parasites derived from their bioaccumulation capacity, because of the absorption of nutrients directly from the intestinal content of the fish through the tegument, as well as for the presence of Cd on the surface waters of Prana River floodplain. Besides that, the Co-efficient of Spearman Rank Correlation showed that the infrapopulation size seems to affect Cd bioaccumulation in the parasites, smaller infrapopulations demonstrate a higher accumulation capacity compared to the larger ones. With that, we concluded that the two acanthocephalans species analyzed in this study have a good capacity for Cd accumulation, and can be used as accumulation indicators of trace-metal pollution. Accumulation indicators provide important information on the biological availability of pollutants. (C) 2020 Elsevier B.V. All rights reserved.