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| Hahn,Norma Segatti; Almeida,Vera Lúcia Lescano de; Luz,Karla Danielle Gaspar da. |
| Hoplosternum Uttorale (Hancock, 1828) is an abundant species in the lagoons of the upper Paraná river floodplain. This species was sampled in Patos and Guaraná lagoons in the flood period (November/92-May/93) and low water period (June-October/93). To analyse food contents in the diet were analysed stomach of 91 adults. Twenty seven food items were recorded, among them, Testaceae, Nematoda, microcrustaceans, quironomids and organic detritus were predominant. These items allows to characterize the species as bentivore. To study feeding activity were analized 565 adults stomach contents. Food intake was more intense during flooding. Considering diel variation, the species started to eat during dusk, increasing during night, stopping to eat during daytime. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Siluriformes; Callichthyidae; Hoplosternum Uttorale; Feeding; Diel cycle; Lagoons. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100005 |
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| Jauzein, Cecile; Collos, Yves; Laabir, Mohamed; Vaquer, Andre. |
| Uptake rates of three potential N-sources (ammonium, nitrate and N-urea) and two potential C-sources (HCO(3)(-) and C-urea) were estimated during growth of Alexandrium catenella in both light and dark phases. According to the variations observed in (13)C-isotopic ratio, A. catenella cells were not able to use C-urea. Furthermore, decreases in (13)C cell content during darkness revealed a probably high involvement of C recently fixed in dark respiration. Dark N-uptake capacities of A. catenella were characterized by dark/light uptake ratio of 27%, 43% and 65% for NO(3)(-), NH(4)(+) and N-urea, respectively. An accumulation of C-rich compounds during the light period was highlighted through strong diel variations in C:N ratio and would provide C and energy... |
| Tipo: Text |
Palavras-chave: Diel cycle; Dark uptake; Nitrogen; Carbon; Uncoupling; Alexandrium catenella. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00056/16699/14199.pdf |
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| Gondolo,Guilherme Fernandez; Mattox,George Mendes Taliaferro; Cunningham,Patricia Teresa Monteiro. |
| Sandy beaches are among the most extensive environments in Brazil and are generally threatened by disorderly urban growth due to their location along the coast, where human populations tend to concentrate. This is especially true in southeastern Brazil, where the largest urban areas are located. Thus, better knowledge regarding these natural resources is of considerable importance. The surf zone of sandy beaches is inhabited by a number of fish species, including juveniles seeking both food and shelter from predators. An ecological survey was conducted in the surf zone of Itamambuca beach in the city of Ubatuba, São Paulo State, Brazil, in order to evaluate the composition, structure and dynamics of the fish fauna using community descriptors. Diurnal and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marine fish; Sandy beach; Community; West Atlantic; Seasonal; Diel cycle. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000200019 |
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| Le Loeuff, P; Intes, A. |
| Benthic communities of the shrimp (Penaeus notialis) grounds off Grand-Bassam, Cote-d'Ivoire, exhibit distinct variations, correlated to annual changes in hydroclimate, characterized by warm and cold (upwelling) seasons. These changes appear to be the result of the well-defined reproduction periods of many short-living benthic species, as clearly shown by the peaks of abundance in the samples, at different times of the year, but quite often at the end of the cold and the beginning of the warm seasons (September-November). Many species show marked diel rhythms, either diurnal (pagurids, brachyurans) or nocturnal (macrurans, brachyurans, molluscs), so that the species composition displays distinct differences between day and night samples (February 1970... |
| Tipo: Text |
Palavras-chave: Faune benthique; Golfe de Guinée; Cycle saisonnier; Cycle circadien; Perturbation; Benthic fauna; Gulf of Guinea; Seasonal cycle; Diel cycle; Perturbation. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43601/43985.pdf |
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