Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)

MARIOTTINI, Y.; POCCO, M.E.; DE WYSIECKI, M.L.; LANGE, C.E.

REVISTA BRASILEIRA DE ENTOMOLOGIA

SOC BRASILEIRA ENTOMOLOGIA

Año: 2015 vol. 59 p. 96 - 99

0085-5626

Dichroplus maculipennis and Borellia bruneri are two of 18 grasshopper species of actual or potential economic relevance as pests in Argentina. The objective of this study was to estimate the sex ratios for adults and older nymphs of D. maculipennis and B. bruneri in the field, and analyze possible temporal variations. The study was conducted during seven seasons (2005-06 to 2011-12) in representative plant communities of the southern Pampas region. A total of 4536 individuals of D. maculipennis, and 6738 of B. bruneri were collected. The sex ratio registered in older nymphs for D. maculipennis and B. bruneri did not deviate from a 1:1 ratio (p>0.05), suggesting that these species have such a primary sex ratio. However, a significant biased in sex composition in adults of both species was observed (p