| Autor: |
Rocca M; Centro de Estudios Parasitológicos y de Vectores/CEPAVE, Facultad de Ciencias Naturales y Museo/FCNyM, CONICET, Universidad Nacional de La Plata/UNLP, Boulevard 120 s/n° 60 y 64, CP 1900 La Plata, Argentina., Rizzo E; Instituto Multidisciplinario de Biología Vegetal/IMBIV, Facultad de Ciencias Exactas, Físicas y Naturales/FCEFyN, CONICET, Universidad Nacional de Córdoba/UNC, Avda. Vélez Sarsfield 1611, CP 6000 Córdoba, Argentina., Greco NM; Centro de Estudios Parasitológicos y de Vectores/CEPAVE, Facultad de Ciencias Naturales y Museo/FCNyM, CONICET, Universidad Nacional de La Plata/UNLP, Boulevard 120 s/n° 60 y 64, CP 1900 La Plata, Argentina.; Comisión de Investigaciones Científicas de la provincia de Buenos Aires/CICBA, Calle 526 10 y 11, CP 1900 La Plata, Argentina. |
| Abstrakt: |
Antagonistic interactions among predators have the potential to dampen top-down impacts on a shared pest. Strong cannibalism by adults and larvae on eggs along with a stronger intraguild predation by Eriopis connexa on Cycloneda sanguinea (Coccinellidae) than vice versa had been documented. The intensity and direction of these interactions could vary with the larval instar. We calculated aggressiveness, attack, and predation rates between larvae in the laboratory and studied both larval mortality and within-plant distribution in plants. Despite high attack rates, larvae of both species usually escaped from predation, except for the fourth vs. second-instar combinations, where the smaller larvae were more vulnerable to predation than the larger. Successful predation by E. connexa fourth-instars on C. sanguinea second-instars frequently occurred. All interactions between larvae became relaxed when extraguild prey were present. The larval mortality within the plants was influenced by the availability of extraguild prey only. Larvae of both species promptly dispersed outside the plant when prey became unavailable. With the extraguild prey present, the larvae of both species initially preferred the plant upper stratum in both combinations, but then dispersed. This study suggests that the defensive capability and larval dispersal could prevent cannibalism and intraguild-predation interactions. |
