|
|
|
|
|
| Silva,Cylene C. da; Ferreira,Efrem J. G.; Deus,Cláudia P. de. |
| A dieta de cinco espécies de Hemiodontidae (Hemiodus argenteus (Pellegrin, 1908), H. atranalis (Fowler, 1940), H. immaculatus (Kner, 1858), H. microlepis (Kner, 1858) e H. unimaculatus (Bloch, 1794)) na área de influência do reservatório de Balbina, rio Uatumã, norte do Brasil, foi investigada. Os peixes foram coletados bimestralmente entre abril de 2005 e fevereiro de 2007, em quatro locais, dois no reservatório (a montante da barragem) e dois no rio (a jusante da barragem). A dieta foi avaliada usando-se dois métodos: freqüência de ocorrência e volume relativo, combinados no Índice Alimentar (IAi). A amplitude do nicho alimentar foi baixa entre as cinco espécies analisadas. Hemiodus unimaculatus apresentou a maior amplitude de nicho, enquanto H.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hemiodus; Impacto ambiental; Hábito alimentar; Peixes da Amazônia. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400008 |
| |
|
| |
|
|
| Silva,Cylene C. da; Ferreira,Efrem J. G.; Deus,Cláudia P. de. |
| The study of fish diet and its interaction with the environment provides important data on ecology and behavior, as fish face varying environmental and food availability conditions. The aim of the present study was to determine the diet of Bryconops caudomaculatus and Bryconops alburnoides, as well as to assess its seasonal variation, within the area influenced by Balbina Hydroelectric Dam (BHD), in the Uatumã River (Amazon Basin, Brazil). Collections were carried out every two months from April 2005 to February 2007, using gill nets with mesh sizes ranging from 12 to 60 mm between opposite knots. Two methods were used for determining diet: frequency of occurrence and relative volume, which were used to calculate the alimentary index (IAi). Diet similarity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feeding ecology; Reservoir; Amazon; Environmental impact. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200011 |
| |
|
|
| Oliveira,Edinbergh C. de; Ferreira,Efrem J. G.. |
| The abundance and distribution of ichthyoplankton and their relationships to current velocity, temperature, dissolved oxygen, pH and electrical conductivity of the water in the Anavilhanas Ecological Station, Negro River, Amazonas State, Brazil, were analyzed. Preferred microhabitats for spawning, dispersion and nursery were also verified. Sampling was undertaken during the falling water period of 2001 and the rising water period of 2002, in a section of 100 km subdivided into 5 subsections, with a total of 20 stations (5 beaches, 5 ravines, 5 channels, and 5 lake channels) at night and during the day at the surface and at the bottom. 647 eggs and 4,187 larvae were captured, belonging to 10 families and four orders: Characiformes (6), Siluriformes (2),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ichthyoplankton; Black water; Reproduction; Protected Areas; Amazon. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400003 |
| |
|
|
| Kullander,Sven O; Ferreira,Efrem J. G.. |
| Apistogramma angayuara is described from the rio Trombetas close to the cachoeira Vira Mundo where it is found in association with rapids. It is assigned to the A. pertensis species group, distinguished by the following characters in combination: three prominent stripes composed of dark spots along the sides of the abdomen, 2 vs. 3 postlachrymal infraorbital pores, 5 vs. 4 dentary pores, low dorsal fin in adult males, and presence of a caudal spot. It is the smallest species of Apistogramma reported so far, with the largest male 24.7 mm SL and the largest female 22.7 mm SL, and the first cichlid species found with a significant proportion of rhizopods in the stomach content. Apistogramma salpinction is described from lentic habitats at the margin of road... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonia; Fish; Microphagy; Neotropical; Rheophily; Taxonomy. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300003 |
| |
|
| |
|
|
|
