Consulta: creatorFacets:"Petry,Ana Cristina"
Registros recuperados: 5
Data/hora: 10/06/2024 00:30:35

Ritmo de alimentação de juvenis de Loricariichthys anus (Siluriformes, Loricariidae) da Lagoa dos Quadros, RS, Brasil
Provedor de dados: 76
Autores: Petry,Ana Cristina; Schulz,Uwe Horst.
The rhythm of movements and feeding activity of juveniles of Loricariichthys anus (Valenciennes, 1840) in the Quadros lake, South Brazil, are investigated. Between October 1997 and August 1998, 236 specimens were captured during six bimonthly 24 hour gillnet surveys. Significantly elevated levels of movement and feeding activity during the day are registered. The patterns of movement and feeding activity displayed no significant difference, suggesting that high movement activity levels can be attributed to feeding activity. The mean of the intestinal quotient was 1,89, indicating omnivorous feeding habits.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loricariichthys anus; Juvenile; Feeding rhythm; Intestinal quotient.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212000000200006

Influência do ciclo hidrológico na dieta e estrutura trófica da ictiofauna do Rio Cuiabá, Pantanal Mato-Grossense
Provedor de dados: 76
Autores: Corrêa,Carlos Eduardo; Petry,Ana Cristina; Hahn,Norma S.
Este estudo teve como objetivo avaliar a influência do ciclo hidrológico sobre a dieta e estrutura trófica da ictiofauna no Pantanal. Foram realizadas amostragens mensais entre março de 2000 e fevereiro de 2001, no rio Cuiabá e na lagoa Chacororé. A análise dos conteúdos estomacais de 58 espécies permitiu o reconhecimento de oito categorias tróficas. Peixes das categorias piscívora, detritívora e lepidófaga foram os que apresentaram menor variação na composição da dieta em ambos os ambientes, independente do período hidrológico. Os efeitos do pulso de inundação foram pronunciados na abundância numérica e na biomassa das categorias detritívora e omnívora, enquanto variações nestes parâmetros apresentaram-se relacionadas ao tipo de ambiente para as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alimentação; Estrutura trófica; Pulso de inundação; Peixes neotropicais.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000400018

A macroscopic classification of the embryonic development of the one-sided livebearer Jenynsia multidentata (Teleostei: Anablepidae)
Provedor de dados: 83
Autores: López-Rodríguez,Nathalia C.; Barros,Cíntia M. de; Petry,Ana Cristina.
ABSTRACT This study proposes eight stages according to the main discernible changes recorded throughout the embryonic development of Jenynsia multidentata. The development of morphological embryo structures, pigmentation, and changes in tissues connecting mother and embryo were included in the stage characterization. From the fertilized egg (Stage 1), an embryo reaches the intermediary stages when presenting yolk syncytial layer (Stage 2), initial pigmentation of the outer layers of the retina and dorsal region of the head (Stage 3), and the sprouting of the caudal (Stage 4), dorsal and anal fins (Stage 5). During the later stages, the ovarian folds enter the gills, and the body pigmentation becomes more intense (Stage 6), the body becomes elongated (Stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Developmental stages; Dry weight; Matrotrophy; Morphology; Viviparity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000400206

Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year
Provedor de dados: 83
Autores: Petry,Ana Cristina; Agostinho,Angelo Antonio; Gomes,Luiz Carlos.
Irregular rainfall and pronounced reductions of the hydrometric level in the year 2000 resulted in drastically altered hydrological connectivity of lentic environments in the upper Paraná River floodplain. The objective of the present work was to examine spatial and temporal patterns of fish assemblage attributes and structure in relation to limnological variables associated with hydrological connectivity. Fish were collected quarterly by seining in the marginal areas of 15 lagoons belonging to two biotopic categories (connected and disconnected). Variation in assemblage composition reflected the degree of hydrological connectivity. Values of assemblage attributes (species richness, density and biomass) were significantly lower in connected lagoons than in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical fishes; Fish assemblage structure; Hydrological connectivity; Floodplain.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200005

Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Paraná River floodplain
Provedor de dados: 83
Autores: Petry,Ana Cristina; Abujanra,Fabiane; Gomes,Luiz Carlos; Julio Jr.,Horácio Ferreira; Agostinho,Angelo Antonio.
The effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period from 2000 to 2003. There were overall reductions in dissolved oxygen levels and increases in transparency of water in lakes in years of moderate floods. The duration of floods influenced species differentially based on their tolerance to hypoxia: in moderate floods, richness of STH increased and numerical abundance and biomass of SIH reduced significantly. Opposite relationships were detected between dissolved oxygen and the attributes of STH and SIH. Dissolved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissolved oxygen; Duration of floods; Lakes and rivers; Neotropical; Water transparency.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200413