Demographic study of two population outbreaks of Elasmoderus wagenknechti (Liebermann) (Orthoptera: Tristiridae) in the transitional desert of Chile.

摘要: Under certain environmental conditions, several species of grasshoppers inhabiting rangeland areas (e.g., inter-valleys) the Chilean transitional desert can irrupt demographically. One them is Elasmoderus wagenknechti (Liebermann), an endemic species. We studied two outbreaks occurred in 1996 and 1999. The objectives research were to (i) estimate some demographic parameters associated with aforementioned events, (ii) compare between population parameters. we density (ind/m2), sexual proportion, female fertility (i.e., eggs/female), relationship eggs/female versus size. Density (ind/m2) ranged from 0.2 0.4 0.5 0.6 ANOVA-tests registered differences among study sites years. In sites, females more abundant than males Lomas del Sauce). Females 27 39 eggs per female, significant but not For 30-50 mm body size, a linear was detected egg number/female It concluded that E. are site-specific area examined show high variability events.