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Volume 2014, Article ID 650427, 3 pages
Research Article

The Effect of Conspecific Density on Emergence of Lestes bipupillatus Calvert, 1909 (Odonata: Lestidae)

1Departamento de Ciências Biológicas, Faculdade de Ciências e Letras de Assis, Universidade Estadual Paulista, Av. Dom Antônio, 2100, 19806-900, Assis, SP, Brazil
2Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes, 3900, 14040-901 Ribeirão Preto, SP, Brazil
3Departamento de Biologia, Fundação Universidade Federal de Rondônia, 76850-000 Guajará-Mirim, RO, Brazil

Received 11 October 2013; Accepted 18 November 2013; Published 30 January 2014

Academic Editor: Kleber Del-Claro

Copyright © 2014 Ricardo Cardoso-Leite et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Conspecific density may influence adult recruitment and consequently population dynamics. Several studies have shown the density dependence of larvae growth rates in Odonata. However, few studies studied how conspecific density influence final instar larvae emergence date decisions. Considering that larvae may choose the date of emergence, the present study investigated if density affects larvae choice. For this, we reared eight final instar larvae in individual aquaria and other 24 larvae in aquaria with three larvae each. This way, we simulated environments with low and high larval densities. We then noted the days that larvae took to emerge and compared it between low and high density groups. The results showed that larvae seem to emerge earlier when in high densities (Mann-Whitney, , ). These results support the hypothesis that damselfly last instar larvae may postpone or hasten emergence in response to the social environment and related constraints.