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| Williner,Verónica; Collins,Pablo. |
| Los ecosistemas manifiestan diferentes ciclos influenciados por factores endógenos y exógenos. Los organismos que los componen presentan, acordes a esos cambios, periodicidades en sus actividades. El objetivo del estudio fue determinar el ritmo nictemeral del camarón Macrobrachium jelskii en una lagunas del Parque Nacional Río Pilcomayo, Argentina, y su variación en una transecta perpendicular a la costa. Las capturas fueron realizadas con trampas cada cuatro horas durante tres días consecutivos. En la noche se registró mayor actividad en las zonas vegetadas, caracterizadas por la presencia de ejemplares adultos, principalmente machos. La actividad trófica resultó elevada durante el día en áreas vegetadas, pudiendo ser atribuida a la disponibilidad de... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2002 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2002000100002 |
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| Giri,Federico; Collins,Pablo. |
| The predator-prey relationship of Palaemonetes argentinus Nobili, 1901 and Culex pipiens s.l. larvae was studied under laboratory conditions. The prawns were separated in two groups, isolated and grouped ones. Mosquitoe larvae were offered to prawns in two forms, limited and unlimited offer to both groups. In the first analysis, values of predation did not differ significantly between males and females of P. argentinus. Predation in 24 h was 14,9 ± 4,2 larvae/prawn. A reduction of predation was observed with unlimited offer for the same hour, during all the experiment. Predation with unlimited offer was higher on the first day than on the second, but returned to high values on the third day, for both groups. In the grouped experiment, predation with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palaemonidae; Palaemonetes; Culex; Biological control. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000300002 |
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