Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/17300
Título: Evidence of mercury biomagnification in the food chain of the cardinal tetra Paracheirodon axelrodi (Osteichthyes: Characidae) in the Rio Negro, central Amazon, Brazil
Autor: Marshall, Bruce Gavin
Forsberg, Bruce Rider
Thomé-Souza, Mario J.F.
Peleja, Reinaldo Pacheco
Moreira, Marcelo Z.
Carvalho, Carlos Edwar Freitas de
Palavras-chave: Mercury
Nitrogen
Water Pollutant
Animals
Brasil
Characidae
Cichlid
Environmental Monitoring
Fish
Food Chain
Metabolism
Plant
Water Pollutant
Animal
Brasil
Characidae
Cichlids
Environmental Monitoring
Fishes
Food Chain
Mercury
Nitrogen
Nitrogen Isotopes
Plants
Water Pollutants, Chemical
Data do documento: 2016
Revista: Journal of Fish Biology
É parte de: Volume 89, Número 1, Pags. 220-240
Abstract: In this study, nitrogen stable isotope (δ(15) N) and total mercury (THg) analyses were conducted on algae, submersed and emergent macrophytes, shrubs and trees, Macrobrachium sp. and Paracheirodon axelrodi collected in three streams that drain a large interfluvial region in the middle Rio Negro, Amazonas State, Brazil. Samples were collected during different hydrological periods over 12 months in lower stream reaches and their headwaters; the latter being characterized by shallow, open-canopy swamps. Additionally, δ(15) N values and mercury concentrations of Paracheirodon simulans and Cichla spp. from the middle Rio Negro were analysed to demonstrate THg biomagnification in the food web. The highest mercury levels of P. axelrodi were found in small individuals, which were collected principally in the low water period. The log10 THg-δ(15) N relationship of vascular plants and algae, Macrobrachium sp., Paracheirodon spp. and Cichla spp. showed significant mercury biomagnification among trophic levels, with regression slopes of 0·15 and 0·25 for the entire food web and heterotrophs-only food web, respectively. The mean ± s.d. THg concentrations for Macrobrachium sp., P. axelrodi, P. simulans and Cichla spp. were 63·6 ± 23·7, 104·5 ± 40·0, 112·3 ± 31·4 and 418·5 ± 188·1 ng g(-1) wet mass, respectively. Elevated levels of mercury found in Paracheirodon spp. and top predators such as Cichla spp. in a remote area far from anthropogenic inputs provide evidence that high mercury concentrations occur naturally in Rio Negro aquatic food webs. © 2016 Fisheries Society of the British Isles.
DOI: 10.1111/jfb.12952
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