Thorough analysis of polyhalogenated compounds in ray liver samples off the coast of Rio de Janeiro, Brazil

Rosenfelder, Natalie; Lehnert, Katja; Kaffarnik, Stefanie; Torres, João Paulo Machado; Vianna, Marcelo; Vetter, Walter

doi:10.1007/s11356-011-0569-2

Cited by 37 publications

(29 citation statements)

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“…The study of feeding ecology of elasmobranchs is essential because in general they occupy intermediate or high trophic levels (Vianna et al, 2000;Ebert, Bizzarro, 2007); because of the intensifying fishery exploitation that is reducing populations of these organisms (Vooren, Klippel, 2005;Andrade et al, 2008), the scarcity of biological data that hinders knowledge of the species (Vianna et al, 2000;Chiaramonte et al, 2004;Massa et al, 2006;Rosa et al, 2004;Andrade et al, 2008;Silva Junior et al, 2011;Viana, Vianna, 2014;Bornatowski et al, 2014c) and the possibility that elasmobranchs may become contaminated by persistent organic pollutants, with consequences for the entire food web (Rosenfelder et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology of elasmobranch species in southeastern Brazil

2017

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The feeding ecology of five elasmobranch species was studied on the southern coast of Rio de Janeiro, southwestern Atlantic Ocean. The specimens were caught with a trawl or bottom longline between January 2006 and August 2007. The diets of Psammobatis rutrum and Psammobatis extenta appeared to be basically carcino-benthophagous, with a very small niche width. Rioraja agassizii was basically carcino/ichthyo-benthophagous, also with a narrow niche, including teleost fish and shrimp, but in different proportions according to age and sex. Rhizoprionodon lalandii was ichthyophagous, not influenced by age or sex. The analyses of these species and Atlantoraja cyclophora indicated two trophic groups: one composed of the smaller rays, P. extenta and P. rutrum, which basically fed on small crustaceans, polychaetes and nematodes; and the other of R. lalandii and the larger rays R. agassizii and A. cyclophora, which preyed on teleost fish and brachyurans.Keywords: Alimentary index, Carcharhinidae, Demersal fishes, Rajidae.Devido à lacuna de conhecimento sobre os elasmobrânquios estudamos a ecologia alimentar de cinco espécies desse grupo, no litoral sul do Rio de Janeiro. Os exemplares foram capturados por rede de arrasto e espinhel de fundo, entre janeiro de 2006 e agosto de 2007. As dietas de Psammobatis rutrum e Psammobatis extenta se mostraram basicamente carcino-bentofagas, com uma largura de nicho estreito. Rioraja agassizii foi considerada carcino/ictio-bentófaga, também com uma largura de nicho estreita. A espécie se alimenta com peixe e camarão, mas em proporções diferentes de acordo com a idade e sexo. A dieta de Rhizoprionodon lalandii foi considerada ictiófaga e não é influenciada pela idade ou sexo. As análises destas espécies e Atlantoraja cyclophora indicaram a formação de dois grupos tróficos: um composto pelas raias menores, P. extenta e P. rutrum, que basicamente se alimentam de pequenos crustáceos, poliquetos e nematodas; e o outro de R. lalandii e as raias maiores R. agassizii e A. cyclophora, que predam peixes teleósteos e brachyuras.

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Section: Discussionmentioning

confidence: 99%

Feeding ecology of elasmobranch species in southeastern Brazil

2017

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“…It is estimated that fishing pressure is responsible for at least 30% of the population decline of this ray on the Brazilian coast (Vooren et al, ). As a coastal species, they are more susceptible to threats related to habitat degradation and contamination (Rosenfelder et al, ). It is classified as vulnerable by the International Union for Conservation of Nature, and in Brazil, as Critically Endangered (Bauer, Fischer, Dario, & Mincarone, ).…”

Section: Introductionmentioning

confidence: 99%

“…As a coastal species, they are more susceptible to threats related to habitat degradation and contamination | 985 PAIVA et Al. (Rosenfelder et al, 2012). It is classified as vulnerable by the International Union for Conservation of Nature, and in Brazil, as Critically Endangered (Bauer, Fischer, Dario, & Mincarone, 2017).…”

Section: Introductionmentioning

confidence: 99%

First description of the embryos of the stingray Gymnura altavela (Linnaeus, 1758) (Myliobatiformes: Gymnuridae), a species at risk of extinction

et al. 2018

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Summary This contribution presents a brief morphometric description of adult females and embryos of the ray Gymnura altavela. Two females, pregnant with a total of five embryos, were captured in Rio de Janeiro, southeastern Brazil, and their morphometry was compared to their respective embryos. The embryos showed higher body proportions (%DW) than adults, regardless of sex, which may be an effect of ontogeny.

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“…In the tropical estuary of Guanabara Bay (Rio de Janeiro State, Brazil), the harvest of flatfishes is associated with intense fishing as bycatch of shrimp trawl fisheries (Jablonski et al 2006). However, very little information is available on the fish fauna of this estuary (Rodrigues et al 2007;Andrade-Tubino et al 2009;Rosenfelder et al 2012;Silva-Junior et al 2012;Franco et al 2014). The scarcity of information about the flatfish community of Guanabara Bay, a tropical estuary with a history of environmental degradation, demands a thorough assessment of the fish community.…”

Section: Introductionmentioning

confidence: 99%

Use of a species-rich and highly eutrophic tropical estuary in the South Atlantic by Pleuronectiformes (Teleostei: Acanthopterygii)

et al. 2019

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A total of 1,471 specimens of 16 species of flatfishes (Pleuronectiformes) were caught during 48 sampling campaigns between July 2005 and June 2007 at ten stations in Guanabara Bay, Rio de Janeiro, Brazil. Paralichthyidae was the dominant family, with Etropus crossotus as the dominant species. The outer stations, especially those on the western side of the lower estuary, were distinguished as a result of their higher abundance of flatfishes and number of species. The spatial distribution of E. crossotus and its population structure indicate that this species is an estuarine resident despite the apparent reduction in its area of occupation within the estuarine complex. Among the other species, nine were classified as marine stragglers (Achirus declivis, Bothus ocellatus, Cyclopsetta chittendeni, Etropus longimanus, Paralichthys orbignyanus, P. patagonicus, Syacium micrurum, Symphurus diomedeanus and Trinectes paulistanus) and three as estuarine opportunists (Bothus robinsi, Citharichthys macrops and Syacium papillosum); another three could not be classified due to the small number of captures or lack of previous data (S. tessellatus, A. lineatus and C. spilopterus).

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Thorough analysis of polyhalogenated compounds in ray liver samples off the coast of Rio de Janeiro, Brazil

Abstract: The two ray species showed high concentrations of organohalogen compounds in their liver tissue. Varied δ (13)C values by up to 3.1‰ indicated that the two ray species were living in different habitats.

Cited by 37 publications

References 42 publications

Feeding ecology of elasmobranch species in southeastern Brazil

Feeding ecology of elasmobranch species in southeastern Brazil

First description of the embryos of the stingray Gymnura altavela (Linnaeus, 1758) (Myliobatiformes: Gymnuridae), a species at risk of extinction

Use of a species-rich and highly eutrophic tropical estuary in the South Atlantic by Pleuronectiformes (Teleostei: Acanthopterygii)

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