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

Dichroplus maculipennis and Borellia bruneri are two of the 18 grasshopper species of actual or potentialeconomic relevance as pests in Argentina. The objective of this study was to estimate the sex ratios foradults and older nymphs of D. maculipennis and B. bruneri in the field, and analyze possibl...

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Autores principales: Mariottini, Yanina, Pocco, Martina Eugenia, Wysiecki, María Laura de, Lange, Carlos Ernesto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Zoología
Acrididae
Adults
Nymphs
Pampas region
Sex ratio
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86403
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86403
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Zoología
Acrididae
Adults
Nymphs
Pampas region
Sex ratio
spellingShingle Zoología
Acrididae
Adults
Nymphs
Pampas region
Sex ratio
Mariottini, Yanina
Pocco, Martina Eugenia
Wysiecki, María Laura de
Lange, Carlos Ernesto
Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
topic_facet Zoología
Acrididae
Adults
Nymphs
Pampas region
Sex ratio
description Dichroplus maculipennis and Borellia bruneri are two of the 18 grasshopper species of actual or potentialeconomic relevance as pests in Argentina. The objective of this study was to estimate the sex ratios foradults 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 6038 individuals 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 sexratio. However, a significant bias in sex composition in adults of both species was observed (p < 0.05). Thesex ratio in adults of D. maculipennis was different in five of the 18 sampling dates carried out. In three sampling dates it was biased toward males, while in the other two it was biased toward females. Takinginto account the sex ratio by sampling season, significant differences were recorded in two seasons. In 2007-08 the sex ratio was biased toward males (1 F:2.26 M), while in 2008-09 it was biased toward females (1.35 F:1 M). The sex ratio in adults of B. bruneri was always biased toward males (p < 0.05). We conclude that results obtained in this study indicate that various factors like differential survival, dispersion, predation, among others, could have modified the primary sex ratio in these species.
format Articulo
Articulo
author Mariottini, Yanina
Pocco, Martina Eugenia
Wysiecki, María Laura de
Lange, Carlos Ernesto
author_facet Mariottini, Yanina
Pocco, Martina Eugenia
Wysiecki, María Laura de
Lange, Carlos Ernesto
author_sort Mariottini, Yanina
title Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
title_short Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
title_full Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
title_fullStr Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
title_full_unstemmed Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
title_sort sex ratios in juveniles and adults of dichroplus maculipennis (blanchard) and borellia bruneri (rehn) (orthoptera: acrididae)
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86403
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