Consulta: creatorFacets:"Negreiros,Natalia Felix"
Registros recuperados: 3
Data/hora: 13/06/2024 19:27:05

A search for predators and food selectivity of two native species of Hydra (Cnidaria: Hydrozoa) from Brazil
Provedor de dados: 49
Autores: Massaro,Fernanda Cristina; Negreiros,Natalia Felix; Rocha,Odete.
The Hydra is the most common representative of freshwater cnidarians. In general, it is found in freshwaters on every continent, with the exception of Antarctica. The aim of the present study is to gather biological and ecological data on aspects of two species of Hydra native to Brazil: Hydra viridissima and Hydra salmacidis. Predation and food selectivity experiments were performed to assess the possible predators and the prey preferences, respectively, of the two species. The results indicate that the two species of Hydra were not consumed by any of the predators that were tested, which are typical predators of invertebrates in freshwater: nymphs of Odonata Anisoptera and the phantom midge larvae of Chaoborus sp. (Insecta), adults of Copepoda Cyclopoida...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydra viridissima; Hydra salmacidis; Predation; Prey selection; Feeding.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000200035

Influence of environmental quality of the tributaries of the Monjolinho River on the relative condition factor (Kn) of the local ichthyofauna
Provedor de dados: 49
Autores: Barrilli,Germano Henrique Costa; Rocha,Odete; Negreiros,Natalia Felix; Verani,José Roberto.
The relative condition factors (Kn) of the fishes Astyanax paranae, Phalloceros harpagos and Poecilia reticulata were used as a means of assessing the influence of environmental conditions on the well-being of sub - populations of these species, with the eventual aim of using them as bioindicators of disturbance in tributary streams of the Monjolinho River, in São Carlos - SP. The power-law curve generated by the length-weight relationship indicated a positive allometric growth for the three species studied. Overall, the canonical correspondence analysis (CCA) positively correlated average Kn of A. paranae with well oxygenated and oligotrophic environments, typical of conserved areas or near the natural state. For the average value of Kn obtained for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomonitoring; Condition factor; Length-weight relationship; Degradation; Bioindicators.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100104

The influence of environmental factors on the seasonal dynamics and composition of Rotifera in the Sapucaí River arm of Furnas Reservoir, MG, Brazil
Provedor de dados: 49
Autores: Negreiros,Natalia Felix; Santos-Wisniewski,Maria José dos; Santos,Renata Martins dos; Rocha,Odete.
Seasonal fluctuations in the dynamics of the plankton rotifer populations in an oligo-mesotrophic branch of a tropical reservoir were analyzed with respect to the possible influence of environmental conditions (physical, chemical and biological), with emphasis on biological interactions. Samples were taken monthly from August 2006 to July 2007. The well-defined climatic seasons were reflected in variations of the physical and chemical properties of the water. The zooplankton community consisted mainly of Rotifera, Cladocera and Copepoda, with occasional representatives of Chaoborus brasiliensis (Diptera), Ostracoda, Protozoa and Turbellaria. Rotifera was the dominant group in zooplankton community in 5 of the 12 months of the study and were represented by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rotifera; Furnas reservoir; Intra-zooplankton predation; Inter-specific competition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400023