Influência da disponibilidade de presas, do contraste visual e do tamanho das larvas de Pantala sp. (Odonata, Insecta) sobre a predação de Simocephalus serrulatus (Cladocera, Crustacea)

摘要: The influence of prey availability, visual contrast and size dragonfly ( Pantala sp) larvae on the predation cladocerans Simocephalus serrulatus ) is provided. Twenty-four naiads (12.57±0.05 mm 100.01±9.16 mg) were employed to study relation between rate availability contrast. 5,10, 15 20 cladocerans/L placed in 1L transparent black plastic lined aquariums. Cladocerans (1.63±0.21 0.78 counted replaced hourly for five consecutive hours. different sizes 50mL recipients effects larvae. Each received cladocerans; counting reposition individuals consumed every ten minutes during two hours undertaken. Quadratic effect (p < 0.02) was reported, with an increase availability: 21.67; 39.00; 42.44 49.67% reported densities 5, 10, respectively. Predation higher dark wall aquariums (42.67%) than those walls (33.72%). Size had a quadratic highest value occurred 13.23 naiads. While high increases rate, mm-long have