scholarly journals Hábitos alimentares da toninha (Pontoporia blainvillei) na costa norte do Estado do Rio de Janeiro, Brasil

2020 ◽  
Vol 12 (1) ◽  
pp. 745-749
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Salvatore Siciliano
Keyword(s):  
Rio De Janeiro ◽  
Trichiurus Lepturus ◽  
Pontoporia Blainvillei

Esta nota de pesquisa descreve as presas identificadas no conteúdo estomacal de quatro carcaças de toninha, Pontoporia blainvillei, recuperadas a partir de encalhes em praias da costa norte do Rio de Janeiro, sudeste do Brasil, entre 2010 e 2011. Os peixes identificados como presas foram Lycengraulis grossidens, Trichiurus lepturus, Paralonchurus brasiliensis, Chirocentrodon bleekerianus, Isopisthus parvipinnis, Pellona harroweri e Stellifer rastrifer. Os cefalópodes consumidos foram as lulas Doryteuthis plei e D. sanpaulensis. Camarões da família Penaeidae cuja identificação específica não foi possível foram registrados nos conteúdos estomacais. Todas as presas são espécies costeiras, abundantes na região. A comparação com dados pretéritos sobre a alimentação de P. blainvillei, obtidos entre 1989 e 1999, sugere que não houve mudança temporal no seu hábito alimentar preferencial na região.

scholarly journals Trophic niche comparison between two predators in northern Rio de Janeiro State, Brazil: a stable isotopes approach

2013 ◽  
Vol 13 (3) ◽  
pp. 29-33 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Carlos Eduardo Rezende ◽  
Plínio Barbosa Camargo ◽  
Helena Amaral Kehrig
Keyword(s):  
Food Chain ◽  
Rio De Janeiro ◽  
Trophic Position ◽  
Food Resources ◽  
Trophic Niche ◽  
Eastern Brazil ◽  
Trichiurus Lepturus ◽  
Δ15n And Δ13c ◽  
Pontoporia Blainvillei ◽  
Janeiro State

The trophic niche of the sympatric predators Pontoporia blainvillei(franciscana dolphin) and Trichiurus lepturus (ribbonfish) was compared by stable isotope (δ15N and δ13C) ratios in hepatic and muscular tissues to understand how they co-exist in the northern Rio de Janeiro State (21°30′S-22°15′S), south-eastern Brazil. Dolphin specimens were incidentally captured through commercial gillnet fisheries, while fish specimens were the target of these fisheries. The predators had similar δ15N values in the liver (P. blainvillei: 14.6 ± 1.0‰; T. lepturus: 14.4 ± 0.6‰), which indicates similar trophic position in the recent food intake. However,P. blainvillei showed lighter δ15N values in muscle (13.8 ± 1.0‰) than T. lepturus (15.0 ± 0.4‰), revealing differences in the long term diet that could be related with the prey size ingested. The δ13C signatures showed a preferential inshore and benthic food chain for P. blainvillei (liver: −15.2 ± 0.6‰; muscle: −16.0 ± 0.5‰) and a more offshore and pelagic food chain for T. lepturus(liver: −17.2 ± 0.6‰; muscle: −16.8 ± 0.3‰). The isotopic variances of liver and muscle revealed a broader niche width to P. blainvillei in relation to T. lepturus, with a greater use of available food resources in coastal waters. In the area of study, the differences in habitat use and exploitation of food resources are favoring the predators' coexistence.

Stomach contents of the marine tucuxi dolphin (Sotalia guianensis) from Rio de Janeiro, south-eastern Brazil

2007 ◽  
Vol 87 (1) ◽  
pp. 253-254 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Salvatore Siciliano
Keyword(s):  
Rio De Janeiro ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Additional Information ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil ◽  
Trichiurus Lepturus ◽  
Cynoscion Guatucupa ◽  
Janeiro State

Along the central coast of Rio de Janeiro State (22°25′S–23°00′S), south-eastern Brazil, the marine tucuxi dolphin (Sotalia guianensis) feeds on neritic prey that are distributed through the water column and are abundant all year round. The most frequently found species were the teleost fish Trichiurus lepturus, Cynoscion guatucupa, Isopisthus parvipinnis and Porichthys porossisimus. Fish species were more important than cephalopod species in the diet of the marine tucuxi. Back calculations of prey sizes indicated that they feed mainly on young specimens. The present study provided additional information on the feeding habits of the marine tucuxi dolphin.

scholarly journals Seasonal variation in metazoan parasites of Trichiurus lepturus (Perciformes: Trichiuridae) of Rio de Janeiro, Brazil

2011 ◽  
Vol 71 (3) ◽  
pp. 771-782 ◽  
Author(s):  
AR. Carvalho ◽  
JL. Luque
Keyword(s):  
Seasonal Variation ◽  
Temporal Variation ◽  
Coastal Zone ◽  
Rio De Janeiro ◽  
Metazoan Parasites ◽  
Trichiurus Lepturus ◽  
Anisakid Larvae

This work aimed to study the temporal variation of metazoan parasites of Trichiurus lepturus from the coastal zone of Rio de Janeiro, Brazil. Between July 2006 and June 2007, there were four seasonal quarterly samples of 30 specimens of T. lepturus. In addition to a group composed of anisakid larvae, we collected a total of 14 species of metazoan parasites: five digenean; five monogenean, two cestode larvae, one acanthocephalan larvae; and one copepod. With the exception of Lecithochirium microstomum and Lecithochirium sp., all species showed peaks of prevalence and abundance especially those fishes collected in summer, which may indicate a seasonal variation of these parasites in T. lepturus from the coast of Rio de Janeiro.

Osteomas in cutlass fish, Trichiurus lepturus L., from Niteroi, Rio de Janeiro state, Brazil

2002 ◽  
Vol 25 (1) ◽  
pp. 57-61 ◽  
Author(s):  
F C Lima ◽  
A P M Souza ◽  
E F M Mesquita ◽  
G N Souza ◽  
V C J Chinelli
Keyword(s):  
Rio De Janeiro ◽  
Trichiurus Lepturus ◽  
Janeiro State

Heavy metal distribution in two cetacean species from Rio de Janeiro State, south-eastern Brazil

2008 ◽  
Vol 88 (6) ◽  
pp. 1117-1120 ◽  
Author(s):  
Carlos Eduardo Veiga de Carvalho ◽  
Ana Paula M. Di Beneditto ◽  
Cristina Maria M. Souza ◽  
Renata M.A. Ramos ◽  
Carlos Eduardo Rezende
Keyword(s):  
Rio De Janeiro ◽  
Marine Mammals ◽  
Cetacean Species ◽  
South Eastern ◽  
Eastern Brazil ◽  
The Difference ◽  
Contamination Levels ◽  
Positive Correlations ◽  
Pontoporia Blainvillei ◽  
Janeiro State

Mercury (Hg), cadmium (Cd) and zinc (Zn) concentration were analysed in muscular and liver tissues of two cetacean species, franciscana Pontoporia blainvillei and boto-cinza Sotalia guianensis, in order to compare their contamination levels in northern Rio de Janeiro State, south-eastern Brazil. The cutlassfish, Trichiurus lepturus, which is the preferential prey of the boto-cinza, have also been analysed. Liver tissue always presented higher concentrations when compared with muscle samples for all the studied metals. The boto-cinza showed higher concentrations for all metals in both tissues than in the franciscana, and the only exception was Cd. This result is probably related to the difference in size prey preference of each cetacean. Mercury was the only element that presented significant positive correlations with body length and age in both cetacean species. The cutlassfish showed rising Hg concentrations with weight and total length, suggesting a possible mercury pathway for marine mammals' contamination.

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