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Biota Neotropica

Print version ISSN 1678-6424On-line version ISSN 1676-0611

Biota Neotrop. vol.13 no.3 Campinas July/Sept. 2013

https://doi.org/10.1590/S1676-06032013000300038 

Short Communications

Nidification of Polybia rejecta (Hymenoptera: Vespidae) associated to Azteca chartifex (Hymenoptera: Formicidae) in a fragment of Atlantic Forest, in the state of Minas Gerais, southeastern Brazil

Nidificação de Polybia rejecta (Hymenoptera: Vespidae) associada com Azteca chartifex (Hymenoptera: Formicidae) em um fragmento de Mata Atlântica, no estado Minas Gerais, Sudoeste do Brasil

Marcos Magalhães de Souza1 

Epifânio Porfiro Pires2  4 

Fábio Prezoto3 

1Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas – IFSULDEMINAS, Campus Inconfidentes, CEP 37576-000, Inconfidentes, MG, Brazil

2Departamento de Entomologia, Universidade Federal de Lavras – UFLA, CEP 37200-000, Lavras, MG, Brazil

3Departamento de Zoologia, Universidade Federal de Juiz de Fora – UFJF, CEP 36036-900, Juiz de Fora, MG, Brazil


ABSTRACT

Records to nesting between associated social wasp Polybia rejecta(Fabricius, 1798) and the ant Azteca chartifex Forel, 1896 in the Parque Estadual do Rio Doce, Minas Gerais, are reported. This association is reported for the first time in this biome. Twelve colonies of P. rejecta founded close to nests of A. chartifex were observed. The wasp colonies were founded at a distance of about 10-20 cm from the ant nest and they did not overlap. The nests of wasps were smaller compared to ant, but the coloring was similar protective casing, making it difficult to differentiate between the wasp nest and the ant.

Key words: interaction; social wasp; ant; Atlantic Forest; colonies

RESUMO

Registra-se a nidificação associada entre a vespa social Polybia rejecta (Fabricius, 1798) e a formiga Azteca chartifex Forel, 1896 no Parque Estadual do Rio Doce, Minas Gerais. Esta associação é observada neste bioma pela primeira vez. Observaram-se doze colônias de P. rejectafundadas ao lado de ninhos da A. chartifex . Cada colônia da vespa social foi fundada a uma distância em torno de 10 a 20 cm do ninho da formiga, não ocorrendo sobreposição das colônias. Os ninhos das vespas eram menores em relação a formiga, porém a coloração do invólucro protetor era semelhante, o que dificultava a diferenciação entre os ninho da vespa e da formiga.

Palavras-Chave: interação; vespa social; formiga; Mata Atlântica; colônias

Introduction

Social wasps are insects that carry out countless ecological functions in ecosystems, acting in biological control, pollination and environmental bioindicators (Prezoto et al. 2005, Souza et al. 2010, Souza & Zanúncio 2012) and, like any eusocial insect, their survival depends on the success of the foundation of new colonies among other factors (Lima & Prezoto 2003, Silva et al. 2006, Gobbi et al. 2009).

It is known that ants exerted a selective pressure on the evolution of the architectural standard of wasp nests, due to predation (Andena et al. 2009), and they are considered a threat for Neotropical social wasps (Jeanne 1970).

In spite of the antagonistic relationships between ants and social wasps, they can form interspecific nest associations, as already known for Polybia rejecta(Fabricius, 1798) and Synoeca chalybea Saussure, 1852, which usually build their nests associated to those of ants of the genus Azteca, as recorded in Peru, Costa Rica and Trinidad and Tobago (Vesey-Fitzgerald 1938, Richards 1945, Herre et al. 1986). It has been demonstrated that most of the species of Vespidae nest on plants that possibly possess substances repellent to ants, and that nesting associated to ants represents 11.5% of the total recorded in French Guiana (Corbora et al. 2009). Association of wasp nests with ants of the genusAzteca can be one of the few defenses tropical wasps have against invasions by ants of the tribe Ecitonini (Richards & Richards 1951).

The relationships between wasps and Azteca ants can also be competitive, as recorded for wasps in the genera Polybia (Fry, 1972) andCharterginus Fox, 1898, which were observed stealing food fromAzteca ants in French Guiana and Costa Rica (LaPierre et al. 2007). In the Brazilian Amazon also no record of the association between social wasps Polybia rejecta and Synoeca virginea(Fabricius, 1804) and the ant Azteca chartifex (Somavilla et al. 2013).

Nidification is an important aspect for better understanding the role of those insects in natural ecosystems (Dejean et al. 1998, Hunt & Carpenter 2004), and there is little information on social wasps nesting in the Atlantic Forest, a fragmented biome with strong human influence, and considered a biodiversity “hotspot” (Myers et al. 2000).

The objective of this study was to report the nesting association between the social wasp P. rejecta and the ant Azteca chartifex Forel, 1896 in Parque Estadual do Rio Doce, the largest Atlantic Forest reserve in the state of Minas Gerais, Brazil.

Material and Methods

The study was conducted in Parque Estadual do Rio Doce, the largest remnant of Atlantic Forest in Minas Gerais (36.970 hectares), inserted in the municipalities of Marliéria, Timóteo and Dionísio (19° 45′ to 19° 30′ S and 42° 38′ to 48° 28′ W). The average climate is hot and humid, with two well defined seasons: a dry and moderately cold season, with temperatures ranging from 7 to 20 °C, and a hot and humid season, with temperatures ranging from 28 to 39 °C. The precipitation varies from 1350 to 1900 mm annually and the altitude ranges between 236 and 515 m (Instituto… 1994, Nemésio & Silveira 2006).

The records of the associations were made from January to December, 2010. On this period it was performed 20 observations. An active search method was employed to record the colonies, which consists of walking trails for present inside and edge of woods, watching the treetops, roots of epiphytes, broadleaf, ravines and rocky outcrops (Souza & Prezoto 2006). The number of associated colonies and the distance between nests was obtained with the aid of binoculars and naked eye. There was a high activity of the individuals at the moment the observations and the collection of individuals which was intentional, in order to perform observations during 15 to 20 minutes for each colony, by using thead libitum method, recording all behavioral activities (Del-Claro 2010). By using this methodology we were able to observe aggressiveness behavior between wasps and ants. Ant identification was made at the entomology laboratory of the Universidade Federal de Viçosa, state of Minas Gerais, Brazil. Identifications of social wasps were carried out at the Museu Paraense Emíllio Goeldi, in Belém, state of Pará, Brazil, where the collected biological material has been deposited.

Results and Discussion

Twelve P. rejecta colonies were recorded, all of them founded close to nests of the ant A. chartifex (Figure 1), a novel record for the Atlantic Forest in Brazil, so far only reported in the Brazilian Amazon (Somavilla et al. 2013).

Figure 1. Associated nests of the wasp Polybia rejecta (right) and the antAzteca chartifex (left) in Parque Estadual do Rio Doce, Minas Gerais, Brazil. 

Each wasp colony was founded at a distance of around 10 to 20 cm from the ant nest, with no colony overlap. The nests of wasps were smaller compared to ant, but the coloring was similar protective casing, making it difficult to differentiate between the wasp nest and the ant, difficulting recognition by an observer, even at a distance of ten meters. No other association was observed, the relationships between the wasps and the ants were not appraised through experiment, which may be due to the short time of observations.

All the observed nests of P. rejecta were associated to A. chartifex, however, some nests of the ant were isolated, suggesting that the wasp obtains greater benefits from the association. This association with ants was not observed in any of the other 35 species of social wasps identified in the study area. The protection against mammalian predators of ants, as anteaters, to be the highest benefit for the ant, and P. rejecta can offer protection against anteaters, thus preventing damage to the nests ofAzteca. Therefore, the social wasps do not cause damage to the ants and can take advantage of their good tolerance (Jeanne 1972, Herre et al. 1986).

The association of P. rejecta nesting close to nests of A. chartifex showed to be common in this area of Atlantic Forest. There was no record of any aggression between both species. However it was not analyzed the potential benefits of this interspecific relationship. Thus, further specific ethological studies should be performed to assess whether this relationship is only a tolerance of the ant to the wasp, or if there is any kind of symbiosis between them.

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Received: September 26, 2012; Revised: August 1, 2013; Accepted: August 23, 2013

4Corresponding author: Epifânio Porfiro Pires, e-mail: epifaniopires@yahoo.com.br

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