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	Provedor de dados 104 (2) 52 (2) 83 (2) 42 (1) Autor Valentin,Jean L. (7) Marazzo,Andrea (2) Aguiar,Aline A. (1) Andrade,Luciana (1) Bonecker,Ana Cristina Teixeira (1) Castro,Marcia S. de (1) Figueiredo,Gisela M. de (1) Freitas,Ana Karina C. H. A. (1) Freitas,Renato H. A. (1) Gonzalez,Alessandra M. (1) Lima,Sergio M. Q. (1) Mendes,Fabiana (1) Paranhos,Rodolfo (1) Viana,Alessandra F. (1) Vianna,Marcelo (1) Mais... Palavra-chave Guanabara Bay (4) Brazil (2) Cladocera (2) Zooplankton (2) Activity measurement (1) Alimentary index (1) Bacterioplankton (1) Carcharhinidae (1) Chaetognath (1) Coastal bay (1) Dasyatidae (1) Demersal fishes (1) Development stage (1) Diurnal variation (1) Elasmobranch (1) Embryos (1) Estuary (1) Eutrophication (1) Evadne spinifera (1) Evadne tergestina (1) Mais... Tipo do documento Info:eu-repo/semantics/article (7) Ano 2019 (1) 2017 (1) 2012 (1) 2005 (1) 2001 (1) 2000 (2) Mais... País Brazil (7) Idioma Inglês (7)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 7 Primeira ... 1 ... Última Reproduction and structure of the population of the Chaetognath Parasagitta friderici in Guanabara Bay (Brazil) based on short term sampling 42 Mendes,Fabiana; Figueiredo,Gisela M. de; Valentin,Jean L.. The aim of this study was to describe the total density, densities of developmental stages and the reproduction period of Parasagitta friderici. Weekly samples were collected at one station in the channel of Guanabara Bay, Rio de Janeiro, during one year. Three vertical hauls were made for each sample, and P. friderici was separated, the developmental stages were identified, and body length (BL), ovary length (OL) and seminal vesicle width (SVW) were measured. Throughout the year P. friderici was the most abundant chaetognath species occurring in all four developmental stages, the densities of which varied from week to week. Higher densities of adults occurred in the spring, followed by peaks of juveniles in the summer. Although P. friderici seems to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chaetognath; Development stage; Guanabara Bay; Reproduction. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100010 Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation 52 Gonzalez,Alessandra M.; Paranhos,Rodolfo; Andrade,Luciana; Valentin,Jean L.. The aim of this work was to evaluate the necessary ³H-leucine concentration to estimate bacterial production in Guanabara Bay through saturation curves. A second aim was to collect preliminary data of bacterial production in two distinct sites corresponding to different water qualities: Urca inlet and Governador Island. Saturation curves were made with water samples taken at the main circulation channel of the bay, Paquetá Island, and the two sites mentioned before. The ³H-leucine curves showed similar pattern for all studied areas, indicating the ideal isotope concentration to be 10 nM. Bacterial biomass production ranged from 0.40 to 4.53 µgC L-1 h-1 in Urca and from 3.86 to 73.72 µgC L-1 h-1 in Governador Island indicating the relationship between... Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Activity measurement; Heterothrophic production; Estuary; Water pollution; Eutrophication. Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500008 Seasonal variation in fish larvae at the entrance of Guanabara Bay, Brazil 52 Castro,Marcia S. de; Bonecker,Ana Cristina Teixeira; Valentin,Jean L.. Studies were carried out to find out qualitative and quantitative temporal variations in fish larvae to relate seasonal, diurnal and tidal cycles to the density of larvae. Sampling was performed at one station, during two three-day periods in September 1995 and March 1996. Samples were collected during ebb and flood tides,in oblique hauls using a bongo net of 500 µm mesh size. A total of 42 taxa were identified. The families Engraulidae (Cetengraulis edentulus, Anchoa lyolepis) and Clupeidae (Harengula jaguana) had high mean densities and dominated both periods. Higher larval mean densities occurred in March, a period of relatively high temperatures and low salinities. The diurnal pattern of larval abundance consisted of high densities at night and low... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish larvae; Seasonal variation; Tidal cycle; Diurnal variation; Coastal bay; Guanabara Bay. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100016 Unravelling the foraging behavior of the southern stingray, Hypanus americanus (Myliobatiformes: Dasyatidae) in a Southwestern Atlantic MPA 83 Freitas,Renato H. A.; Aguiar,Aline A.; Freitas,Ana Karina C. H. A.; Lima,Sergio M. Q.; Valentin,Jean L.. ABSTRACT Previous study suggested that the southern stingray (Hypanus americanus) displays a marked ontogenetic shift in its habitat use in the Fernando de Noronha Archipelago (FNA), an attractive touristic spot in Brazil, that could be associated with changes in its feeding habits and foraging strategies. Here, we conducted underwater visual surveys (~100 h a 3 years’ study) at this site to describe the foraging behavior of the same species in details and to assess diel patterns in activity. We observed that H. americanus is capable of several complex and highly plastic behaviors (we described more than 21 of them) while foraging. The foraging events’ timing appears to be related to the size (as well as sex) of the stingrays, environment and depth. In... Tipo: Info:eu-repo/semantics/article Palavras-chave: Dasyatidae; Elasmobranch; Feeding habits; Fernando de Noronha; Foraging strategies. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200219 Feeding ecology of elasmobranch species in southeastern Brazil 83 Viana,Alessandra F.; Valentin,Jean L.; Vianna,Marcelo. ABSTRACT 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.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Alimentary index; Carcharhinidae; Demersal fishes; Rajidae. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200220 A report on the marine cladoceran Evadne spinifera Müller (Crustacea, Branchiopoda) in Guanabara Bay, Rio de Janeiro, Brazil 104 Marazzo,Andrea; Valentin,Jean L.. This note relates the occurrence of Evadne spinifera Müller, 1867 (Crustacea, Branchiopoda) in Guanabara Bay, Rio de Janeiro State, Brazil. The samples were obtained by vertical tows with a 200µm mesh-size conical net at different times over a four day period in September, 1995. Evadne spinifera densities was always low. Tipo: Info:eu-repo/semantics/article Palavras-chave: Cladocera; Evadne spinifera; Zooplankton; Guanabara Bay; Brazil. Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000400017 Diel changes in embryonic maturation in two species of marine cladocerans in Guanabara Bay, Rio de Janeiro, Brazil 104 Marazzo,Andrea; Valentin,Jean L.. Two species of marine cladocerans, Penilia avirostris Dana, 1852 and Evadne tergestina Claus, 1877 were collected in thirteen samples at a fixed station in Guanabara Bay, Rio de Janeiro (30-meter depth) by means of vertical tows with a 200 µm mesh size net at different times from September 12th to 15th, 1995. The parthenogenetic females of Evadne tergestina bore mature embryos (with pigmented eye) only in the samples collected at night, whereas Penilia avirostris at any time of day. This phenomenon was interpreted based on the greater visibility of the Evadne tergestina brood: one of the benefits for embryo maturing during the darkness period would be a decrease of predation on gravid females. Tipo: Info:eu-repo/semantics/article Palavras-chave: Cladocera; Penilia avirostris; Evadne tergestina; Zooplankton; Embryos; Guanabara Bay; Brazil. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500033 Registros recuperados: 7 Primeira ... 1 ... Última

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