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.

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.

scholarly journals Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

2013 ◽  
Vol 11 (1) ◽  
pp. 211-216 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Vanessa Trindade Bittar ◽  
Carlos Eduardo de Rezende ◽  
Plinio Barbosa Camargo ◽  
Helena Amaral Kehrig
Keyword(s):  
Prey Availability ◽  
Trophic Position ◽  
Feeding Habits ◽  
World Health ◽  
Fish Feeding ◽  
Feeding Ground ◽  
Eastern Brazil ◽  
Trichiurus Lepturus ◽  
Health Organization ◽  
Δ15n And Δ13c

This study applies total mercury (THg) concentration and stable isotope signature (δ15N and δ13C) to evaluate the trophic status and feeding ground of Trichiurus lepturus during its ontogeny in northern Rio de Janeiro, south-eastern Brazil. The trophic position of T. lepturus is detected well by THg and δ15N as the sub-adult planktivorous specimens are distinct from the adult carnivorous specimens. The δ13C signatures suggest a feeding ground associated with marine coastal waters that are shared by fish in different ontogenetic phases. The diet tracers indicated that the fish feeding habits do not vary along seasons of the year, probably reflecting the prey availability in the study area. This fish has economic importance and the concentration of THg was compared to World Health Organization limit, showing that the adult specimens of T. lepturus are very close to the tolerable limit for safe regular ingestion.

Movements of the rough-toothed dolphin (Steno bredanensis) in Rio de Janeiro State, south-eastern Brazil

2012 ◽  
Vol 5 ◽  
Author(s):  
Liliane Lodi ◽  
Rodrigo Hipolito Tardin Oliveira ◽  
Luciana Duarte Figueiredo ◽  
Sheila Marino Simão
Keyword(s):  
Rio De Janeiro ◽  
South Eastern ◽  
Eastern Brazil ◽  
Steno Bredanensis ◽  
Janeiro State

On Spinopilar from Rio de Janeiro state with description of three new species (Opiliones, Laniatores, Cryptogeobiidae)

Zootaxa ◽  
2021 ◽  
Vol 4984 (1) ◽  
pp. 148-181
Author(s):  
ADRIANO B. KURY ◽  
DÉBORA C. ARAUJO
Keyword(s):  
Rio De Janeiro ◽  
Original Description ◽  
Additional Material ◽  
Eastern Brazil ◽  
Three New Species ◽  
New Diagnosis ◽  
Novel Structures ◽  
Latin Description ◽  
Janeiro State ◽  
Janeiro City

The genus Spinopilar Mello-Leitão, 1940 currently has seven species distributed in eastern Brazil, Argentina and Paraguay. Three species are hitherto known from Rio de Janeiro state (RJ), in the Brazilian Atlantic Forest. In this paper, five species from Rio de Janeiro state (RJ) are studied as follows: (1) Spinopilar armatus Mello-Leitão, 1940, the type species of Spinopilar, originally described without illustrations, is herein redescribed based on additional material from the metropolitan area of Rio de Janeiro city. (2) Spinopilar anomalis (Sørensen, 1932) is a species never recorded again after the original description. A new diagnosis is provided for S. anomalis based on a translation of the original Latin description. (3) Spinopilar jocheni spec. nov. is described from Barra de Guaratiba, Southeast RJ. It is characterized by the unarmed mesotergal areas. (4) Spinopilar martialis spec. nov. is described from Macaé, northern RJ. It is characterized by the pars stridens of the stridulatory organ on the pedipalpal femur, the unusual armature of scutal areas (2-2-10-10) and the extremely complex lobes of the stigmatic area in males, which connect the apophyses of coxa and trochanter IV. (5) Spinopilar magistralis spec. nov. is described from Búzios. It is characterized by extreme stoutness of leg IV and an elevated campaniform ocularium. A key is provided to 9 of the 10 species of Spinopilar and a new diagnosis is given for the genus. Two novel structures so far known only in Spinopilar are described: (1) a third type of pars stridens, which is different from the Tibangara-type and the Bissulla/Pseudopachylus-type both in topology and in structure of the ridges; (2) a proximal primary trochanteral cluster (PTC) composed of modified setae situated on the main apophysis of trochanter IV of males. 

Two new Hyalonema species (Hyalonematidae: Amphidiscosida) from eastern and south-eastern Brazil, and further Hexactinellida (Porifera) collected from seamounts off south-eastern Brazil by the RV ‘Marion Dufresne’ MD55 expedition

2009 ◽  
Vol 89 (6) ◽  
pp. 1243-1250 ◽  
Author(s):  
Konstantin R. Tabachnick ◽  
Larisa L. Menshenina ◽  
Daniela A. Lopes ◽  
Eduardo Hajdu
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Rio De Janeiro ◽  
Western Atlantic ◽  
South Eastern ◽  
First Finding ◽  
Campos Basin ◽  
Eastern Brazil ◽  
Janeiro State ◽  
Hexactinellid Sponges

Descriptions of hexactinellid sponges collected by the RV ‘Marion Dufresne’ MD55 expedition on the Vitória–Trindade seamounts chain (off Espírito Santo State, south-eastern Brazil) in 1987 and stored in the MNHN (Muséum National d'Histoire Naturelle in Paris) are presented. Hyalonema (Cyliconema) conqueror sp. nov. (the first finding of this subgenus in the Atlantic Ocean) and H. (Prionema) dufresnei sp. nov. (the second record of this subgenus for the Atlantic Ocean) are described as new species. The holotype of H. (C.) conqueror sp. nov. was collected with a ROV at Campos Basin (off Rio de Janeiro State, south-eastern Brazil), while the paratypes originated from Vitória–Trindade seamounts chain and off Bahía State (eastern Brazil). Other hexactinellids reported here, Farrea sp., Sarostegia aff. oculata, Aphrocallistes aff. beatrix, Dactylocalyx aff. subglobosus and Euplectella suberea were known before to be widely distributed in the Atlantic Ocean. The total number of hexactinellid sponges known from Brazil has risen to 15 and from the south-western Atlantic to 23.

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 Water depth selection during foraging and efficiency in prey capture by the egrets Casmerodius albus and Egretta thula (Aves, Ardeidae) in an urban lagoon in Rio de Janeiro State, Brazil

2005 ◽  
Vol 95 (1) ◽  
pp. 107-109 ◽  
Author(s):  
Aline B. Moreno ◽  
Adriano R. Lagos ◽  
Maria Alice S. Alves
Keyword(s):  
Water Depth ◽  
Significant Relationship ◽  
Rio De Janeiro ◽  
Prey Capture ◽  
Food Resources ◽  
Food Items ◽  
Egretta Thula ◽  
Janeiro State

This study aimed to evaluate the water depth selection during foraging, the efficiency in prey capture, and the food items captured by Casmerodius albus (Linnaeus, 1758) and Egretta thula (Molina, 1782). The work was conducted at an urban lagoon, Lagoa Rodrigo de Freitas, Rio de Janeiro. Four transects were made each month (two in the morning and two in the afternoon) for six months. When the birds were detected foraging, the water depth and the types of prey captured were recorded. There was no significant relationship between the foraging efficiencies of the two species. However, they differed in relation to the water depth when foraging, and also in the food items captured. Casmerodius albus captured mainly fishes while Egretta thula captured mainly invertebrates. The results suggest that the differences in water depth when foraging and the food items captured allow a differential use of the food resources available by C. albus and E. thula at Lagoa Rodrigo de Freitas.

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