Evolução deformacional das rochas do Vale do Jacurici: implicações para a estruturação dos corpos cromitíferos máfico-ultramáficos

Baseado na análise estrutural de rochas do Vale do Jacurici, encaixantes de corpos máfico-ultramáficos mineralizados em cromita, reconheceram-se quatro eventos deformacionais, os quais foram estabelecidos segundo um regime deformacional inicialmente tangencial/compressivo, evoluindo para transpressivo e distensivo, denominados, respectivamente, Dn, Dn+1, Dn+2 e Dn+3. Os referidos eventos deformacionais foram responsáveis por impor forte controle estrutural às rochas máfico-ultramáficas da área, com implicações diretas na geometria e distribuição dos corpos mineralizados em cromita.Based on the structural analysis of Jacurici Valley rocks, wall rock of mafic-ultramafic bodies mineralized in chromite, four deformational events were recognized in the area. These events were established under deformational regimes initially tangential and compressive, developing to transpressive and distensive, respectively denominated Dn, Dn+1, Dn+2 and Dn+3. The referred deformational events were responsible for imposing a strong structural control to the mafic-ultramafic rocks of the area, with direct implications on both geometry and distribution of the chromite-mineralized bodies

Pupal period affects calling behavior of the wheat moth, Pseudaletia sequax (Lepidoptera: Noctuidae)

The effects of pupal period and age on calling behavior of virgin females of Pseudaletia sequax were determined. Calling behavior of groups of females of similar age of pupation was observed every 10 min for six calling days. Females were considered calling when they assumed a characteristic position: wings and abdomen elevated, displaying the ovipositor and presumably releasing pheromone. Calling behavior was discontinuous. Females with a shorter pupal period took more time to start calling than females with a longer pupal period and called for a longer period. On the first day of calling, females took more time to initiate calling, on average during the seventh hour of the scotophase, whereas on the second day of calling, most females initiated calling during the fifth hour of the scotophase. On subsequent days of calling, the average time to initiate calling changed to the fourth hour of the scotophase. The mean time of calling per day decreased significantly with the number of days since first calling, and the mean number of calling bouts increased with days since first calling