|
Vol. 50 No. 6, 2011
Seasonal Occurrence of Life Stages of Grasshoppers (Orthoptera: Acridoidea) in the Southern Pampas, Argentina
Yanina Mariottini1,*, María L. De Wysiecki1, and Carlos E. Lange1,2
1Centro
de Estudios Parasitológicos y de Vectores (CEPAVE) (UNLP-CCT La
Plata-CONICET). Calle 2 N° 584, CP 1900, La Plata, Argentina
2Comisión de Investigaciones Científicas (CIC), provincia de Buenos Aires, Argentina
Yanina Mariottini, María L. De Wysiecki, and Carlos E. Lange (2011) The
seasonal occurrence of life stages of grasshopper species of the
Southern Pampas was studied through sampling of representative habitats
for 5 seasons (Nov. 2005 through Jan. 2010) in Laprida County, Buenos
Aires Province. Twenty-two species were collected, 11 of which were
very abundant. Ten species had 1 generation per year (univoltine), of
which 9 (Aleuas lineatus, Borellia bruneri, B. pallida, Covasacris pallidinota, Dichroplus conspersus, D. elongatus, D. maculipennis, D. pratensis, and Scotussa lemniscata)
spent the winter in the egg stage, with younger nymphs (instars I, II,
and III) occurring from mid-spring (Oct.-Nov.). The period of maximum
abundance of nymphs was from Nov. to mid-Dec. From Jan., most species
had a higher proportion of adults, which was the dominant state by
mid-autumn (Mar.-Apr.). Only 1 species (Sinipta dalmani) spent the winter as a nymph. Baeacris pseudopunctulactus was the only species with more than 1 generation per year.
Key words: Acrididae, Univoltine, Multivoltine, Nymph, Adult.
*Correspondence: Tel: 54-0221-4233471. Fax: 54-0221-4233471 ext. 12. E-mail:ymariottini@cepave.edu.ar
|
