CEPAVE   05420
CENTRO DE ESTUDIOS PARASITOLOGICOS Y DE VECTORES
Unidad Ejecutora - UE
artículos
Título:
The biology and some population parameters of the grasshoppers, Ronderosia bergi, under laboratory conditions
Autor/es:
MARIOTTINI YANINA,; DE WYSIECKI MARIA LAURA; LANGE CARLOS
Revista:
JOURNAL OF INSECT SCIENCE
Editorial:
UNIV ARIZONA
Referencias:
Año: 2010 vol. 10 p. 1 - 12
ISSN:
1536-2442
Resumen:
Some of the main biological and population parameters of Ronderosia bergi were estimated by monitoring five cohorts of the first generation (F1) of individuals born in captivity from grasshoppers collected in the South of Misiones province, northeastern Argentina, and held under controlled conditions (30° C, 14 light – 10 dark; 40% RH). Five nymphal instars were recorded. Total duration of nymphal development was 30.8 ± 0.54 days. The mean lifespan of cohorts was 22.6 ± 0.7 weeks. The number of egg-pods per female was 7.6 ± 1.44, and the amount of eggs per egg-pod was 16.45 ± 0.85. Mean fecundity was 125 ± 5.83 eggs per female with an oviposition rate of 1.55 ± 0.57 eggs/female/day. Survivorship curves showed that mortality was concentrated in final weeks of adulthood, and the life expectancy curve decreased accordingly. The population parameters estimated gave the following values: the net rate of reproduction (R0) was 43.1 ± 1.2, generation time (T) was 12.85 ± 0.7 weeks, duplication time (D) was 2.38 ± 0.29, the intrinsic rate of population growth (rm) was 0.3 ± 0.13 and the finite rate of population increase (ë) was 1.35 ± 0.06. The reproductive values (Vx) indicated that the largest contribution of females to the subsequent generation was done between weeks 9 and 21.