DOI: 10.13102/sociobiology.v60i2.204-209Sociobiology 60(2): 204-209 (2013) Social Wasps on Eugenia uniflora Linnaeus (Myrtaceae) Plants in an Urban Area GK Souza1, TG Pikart1, GC Jacques1, AA Castro1, MM De Souza2, JE Serrão1, JC Zanuncio1 Introduction Social wasps (Hymenoptera: Vespidae) belong to the subfamilies Polistinae, Stenogastrinae and Vespinae (Schmitz & Moritz, 1998). Among these families, only Polistinae can be found in the Neotropical region, with approximately 319 spe- cies occurring in Brazil (Carpenter & Marques, 2001). Social wasps are an important part of food webs, preying on insects of the orders Coleoptera, Diptera, Hemiptera, Hymenoptera and Lepidoptera (Prezoto et al., 2005) in terrestrial ecosys- tems (Richter, 2000; Torezan-Silingardi, 2011). Studies of social wasps have focused on their habitat preferences (Da Cruz et al., 2006; De Souza et al., 2010b), nest density (Diniz & Kitayama, 1994), seasonal number of colonies, nesting habits (Strassmann et al., 1997; Diniz & Kitayama, 1998; Santos et al., 2009a), insecticide selectivity (Galvan et al., 2002; Bacci et al., 2009), and floral visitation (Da Silva-Pereira & Santos, 2006). However, diversity of these insects in urban areas has not been well studied. Floristic diversity and vegetation structure can deter- Abstract Social wasps (Hymenoptera: Vespidae) of the subfamily Polistinae can be effectively in- corporated into IPM systems for urban forestry. This study, conducted in Viçosa, Minas Gerais State, Brazil, in May 2011, identified species of this group foraging on Eugenia uniflora Linnaeus (Myrtaceae) plants. The study area was monitored once a week and data collected included daily activity pattern, diversity, dominance and overlap of tem- poral niches by social wasps. Data analysis revealed that E. uniflora plants were visited by 217 individuals of 16 species of the subfamily Polistinae. Foraging behavior of social wasps bore no relationship with sampling time, but overlap of temporal niche was high. Wasps were not observed damaging healthy fruits, but were probably searching for Lonchaeidae and Tephritidae larvae. This study highlights the need for conservation of predator diversity in order to provide a partial alternative to the environmentally de- grading chemical pesticides currently used in urban forestry for pest control. Sociobiology An international journal on social insects 1 - Universidade Federal de Viçosa, Viçosa - MG, Brazil 2 - Instituto Federal de Educação, Ciência e Tecnologia Sul de Minas Gerais, Pouso Redondo-MG, Brazil RESEARCH ARTICLE - WASPS Article History Edited by: Gilberto M. M. Santos, UEFS - Brazil Received 23 February 2013 Initial acceptance 30 March 2013 Final acceptance 11 April 2013 Keywords Biological control, diversity, Polistinae, urban forestry, Vespidae Corresponding author Tiago Georg Pikart Departamento de Entomologia Universidade Federal de Viçosa Viçosa, Minas Gerais, Brazil 36570-000 E-Mail: tiago.florestal@gmail.com mine composition of social wasp communities (Santos et al., 2007) by affecting foraging activity during their search for water, vegetable fiber, carbohydrates, and proteins (Richter, 2000; Elisei et al., 2010). Social wasps, like other general- ist organisms, forage predominantly on the most abundant resource, without preference and/or selective behavior (San- tos et al., 2007), but they can focus their resource collection activities on a small group of plants (Aguiar & Santos, 2007). Their generalist condition allows them to have low depen- dence on specific or constant food resources (Real, 1981). Brazilian Myrtaceae includes trees and shrubs with po- tential for fruit production and use in urban forestry (Donadio & Moro, 2004). Eugenia uniflora Linnaeus (Myrtaceae) is a semi-deciduous tree native to the south and southeast regions of Brazil used in urban forestry (Alves et al., 2008). Its popu- larity is mainly due to the pleasant and refreshing taste of its fruits, which resemble cherries. However, the occurrence of insect pests such as Eugeniamyia dispar Maia, Mendonça & Romanowski (Diptera: Cecidomyiidae) and Anastrepha fraterculus (Wiedemann) (Diptera: Tephritidae) (Bierhals et Sociobiology 60(2): 204-209 (2013) 205 al., 2012) has been discouraging the use of E. uniflora for landscaping and urban forestry in Brazil. Social wasps are important natural enemies of insect pests (Prezoto et al., 2005; De Souza et al., 2010a; Picanço et al., 2010, 2011) and their diversity is similar or even higher in urban areas than in natural environments (Jacques et al., 2012). In this study we identified the social wasp species for- aging on E. uniflora (Myrtaceae) plants in order to evaluate the potential of this group to provide biological control in an integrated pest management program. Material and Methods Diversity of social wasps (Vespidae: Polistinae) on E. uniflora plants was evaluated at the Universidade Federal de Viçosa (UFV) in an urban area of Viçosa, Minas Gerais State, Brazil, in May 2011. Two people monitored four heav- ily fruiting E. uniflora plants used in the urban forestry of the university once a week between 9:00 h and 15:00 h over a period of four weeks, and living specimens of social wasps foraging on these plants were collected with an insect net and preserved in a vial with 92.8% ethanol. Collected specimens were taken to the Laboratory of Biological Control of Insects at UFV, mounted and identified. Collection data were used to analyze daily activity pattern, diversity, dominance and tem- poral niche overlap of social wasp species. The diversity of social wasps was calculated with the Shannon index (Shannon, 1948) using the formula H’ = Σpkxlnpk. The evenness of visits by each wasp species to E. uniflora plants was calculated with the formula J’ = H’/H’max (Pielou, 1969). The dominance index was calculated with Berger Parker (May, 1975) with the formula d = Nmax/NT. The temporal niche overlap per pair of wasp species was determined by using the Schoener index (Schoener, 1986) with the formula NOih = 1-1/2Σk|pik-phk|d. Species with very small numbers of individuals (n <10) were excluded from the analysis. A Kolmogorov-Smirnov test for two samples was used to evaluate interspecific differences between activity patterns per pair of social wasp species (Siegel, 1956). Results and Discussion Plants of E. uniflora were visited by 217 individuals of 16 species of social wasps of the subfamily Polistinae (Table 1). Species diversity was similar to that of the Atlantic Forest (Santos et al., 2007), but it was lower than that of Cerrado (De Souza & Prezoto, 2006; Elpino-Campos et al., 2007) and Am- azon Forest (Silveira et al., 2008; Silva & Silveira, 2009) ar- eas. The similarity between the fauna of these insects and the species commonly found in the urban area sampled and the Atlantic Forest region is important. Viçosa is included in this biome, which shows that social wasps have a high capacity to adapt to urban environments. Besides occurring in differ- ent ecosystems, differences in collection methods and sample sizes may have contributed to differences in diversity between this study and those from other regions. On the other hand, surveys considering only one plant species showed similar or lower diversity than that of the present study (De Souza et al., 2010a; Santos & Presley, 2010; De Souza et al., 2011), sug- gesting that social wasp diversity may be determined more by variation in tolerance levels between species than by habitat complexity (Bomfim & Antonialli Junior, 2012). Table 1. Number of species and individuals of social wasps (Hymenoptera: Vespidae: Polistinae) collected on Eugenia uniflora (Myrtaceae) fruits in Viçosa, Minas Gerais State, Brazil Number of individuals 04 May 18 May 25 May 30 May Total Agelaia multipicta 4 14 20 10 48 Agelaia vicina 2 0 0 0 2 Brachygastra lecheguana 0 0 1 6 7 Mischocyttarus atramentarius 1 0 0 0 1 Mischocyttarus cassununga 7 6 8 8 29 Mischocyttarus drewseni 0 0 1 0 1 Polistes actaeon 0 1 3 0 4 Polistes simillimus 1 1 6 3 11 Polistes versicolor 9 5 4 3 21 Polybia bifasciata 1 0 1 0 2 Polybia fastidiosuscula 7 9 8 7 31 Polybia ignobilis 1 0 0 0 1 Polybia jurinei 1 0 0 0 1 Polybia platycephala 5 5 23 18 51 Polybia sericea 0 2 2 1 5 Protopolybia exigua 0 1 1 0 2 Total 39 44 78 56 217 Species of the dipteran families Lonchaeidae and Te- phritidae, and Trigona spinipes (Fabricius) (Hymenoptera: Apidae) foraged on E. uniflora fruits. Apis mellifera Linnaeus (Hymenoptera: Apidae) and T. spinipes visited flowers of this plant, but social wasps were not observed in these structures. These last insects can collect nectar to feed their larvae and adults (Da Silva et al., 2011), but this survey was conducted during the dry season, when nectar production could have been insufficient to attract them. Social wasps have no spe- cialized structures for transporting pollen (corbicula) as do A. mellifera and T. spinipes, which were visiting E. uniflora flowers to collect pollen. All social wasp species exploited mainly green fruits GK Souza, TG Pikart, GC Jacques, AA Castro, MM De Souza, JE Serrão, JC Zanuncio - Social Wasps foraging on Eugenia uniflora206 with damaged areas and pre-existing holes caused by T. spin- ipes, and by oviposition behavior of fruit flies, as observed in Anacardium occidentale Linnaeus (Anacardiaceae) planta- tions (Santos & Presley, 2010), and on Myrciaria sp. (Myrta- ceae) plants (De Souza et al., 2010a). Brachygastra lechegua- na (Latreille), Polistes simillimus Zikán, Polistes versicolor (Olivier), Polybia ignobilis (Haliday), Polybia platycephala Richards, and Polybia sericea (Olivier) prey on larval forms of coleopteran, dipteran, and lepidopteran pests of agricultur- al and forest crops (Prezoto et al., 2005; Prezoto et al., 2006; Bichara et al., 2009; Elisei et al., 2010). Foraging behavior of social wasp species may be related to the presence of larvae of fruit flies in E. uniflora. Polybia platycephala (n = 51, d= 0.235) and Agelaia multipicta (Haliday) (n= 48, d= 0.221) were the social wasp species with the higher values of frequency and for the domi- nance index, followed by Polybia fastidiosuscula Saussure (n= 31, d= 0.143), Mischocyttarus cassununga (Von Ihering) (n= 29, d= 0.134), P. versicolor (n= 21, d= 0.097), P. simil- limus (n= 11, d= 0.051), B. lecheguana (n= 7, d= 0.032), P. sericea (n= 5, d= 0.023), and Polistes actaeon Haliday (n= 4, d= 0.018) (Tables 1 and 2). Polybia bifasciata Saussure, Protopolybia exígua Saussure, and Agelaia vicina (Saussure) (n= 2, d= 0.009), and Mischocyttarus atramentarius Zikán, Mischocyttarus drewseni (Saussure), P. ignobilis and Polybia jurinei (Saussure) (n= 1, d= 0.005) were less frequent (Tables 1 and 2) and of accidental occurrence. The active collection of social wasps is an efficient process and can include most species in a survey (De Souza & Prezoto, 2006; De Souza et al., 2011; Jacques et al., 2012), but some of them, such as A. vicina and P. bifasciata, may only be collected in baited traps (De Souza & Prezoto, 2006; Jacques et al., 2012), which may explain their low frequencies in this study. Fig 1. Temporal foraging activity of social wasps (Hymenoptera: Vespidae: Polistinae) on Eugenia uniflora (Myrtaceae) fruits. Viço- sa, Minas Gerais State, Brazil. The foraging behavior of social wasps showed no re- lationship with sampling time (Fig 1), differing from that in A. occidentale plantations, where species of this group for- aged more frequently between 09:00 h and 12:00 h, and from Table 2. Dominance (Berger-Parker) of social wasp species (Hymenoptera: Vespidae: Polistinae) collected on Eugenia uniflora (Myrtaceae) fruits as function of time of the day and total period. Viçosa, Minas Gerais State, Brazil. 09:45 10:45 11:45 12:45 13:45 14:45 Total Agelaia multipicta 0.194 0.180 0.177 0.243 0.333 0.172 0.221 Agelaia vicina - - 0.059 - - - 0.009 Brachygastra lecheguana - - 0.029 0.054 0.048 0.069 0.032 Mischocyttarus atramentarius - - - - 0.024 - 0.005 Mischocyttarus cassununga 0.056 0.051 0.235 0.162 0.191 0.103 0.134 Mischocyttarus drewseni - - - - 0.024 - 0.005 Polistes actaeon 0.028 0.026 - - 0.024 0.035 0.018 Polistes simillinus 0.056 0.077 0.029 0.027 0.071 0.035 0.051 Polistes versicolor 0.139 0.103 0.088 0.081 0.071 0.103 0.097 Polybia bifasciata - 0.026 0.029 - - - 0.009 Polybia fastidiosuscula 0.222 0.128 0.177 0.108 0.071 0.172 0.143 Polybia ignobilis 0.028 - - - - - 0.005 Polybia jurinei - - - 0.027 - - 0.005 Polybia platycephala 0.222 0.333 0.177 0.270 0.119 0.310 0.235 Polybia sericea 0.056 0.077 - - - - 0.023 Protopolybia exigua - - - 0.027 0.024 - 0.009 Number of individuals 36 39 34 37 42 29 217 Shannon-Winner index (H´) 0.843 0.828 0.847 0.820 0.869 0.806 0.911 Pielou Evenness index (J’) 0.884 0.868 0.888 0.859 0.835 0.892 0.757 Sociobiology 60(2): 204-209 (2013) 207 14:00 h to 16:00 h (Santos & Presley, 2010), or the higher foraging activity of the social wasp Parachartergus fraternus (Gribodo) on sunny days, between 12:00 h and 14:00 h (San- tos et al., 2009b). Climatic factors, such as light, temperature and wind speed, directly affect the foraging behavior of social wasps (Kasper et al., 2008; Santos et al., 2009b; De Castro et al., 2011), so changes in these factors during the collection periods may have affected the results. Diversity and evenness values for social wasp species were also similar during all col- lecting periods (Table 2). The temporal niche overlap between pairs of species of social wasps was high, 0.65-0.91 (Schoener index) (Table 3), with the highest value for P. fastidiosuscula and P. versi- color (NOih index= 0.9109). Only five of the 15 comparisons Table 3. Interspecific pairwise comparison of activity patterns of social wasps (species with more than 10 individuals) collected on Eugenia uniflora (Myrtaceae) fruits in Viçosa, Minas Gerais State, Brazil. Values above the diagonal correspond to statistical significance by the Kolmogorov-Smirnov test for two samples (significant values in bold, P< 0.05). Values below the diagonal correspond to temporal niche overlap between pairs of species of social wasps (Schoener index). A. m. M. c. P. s. P. v. P. f. P. p. Agelaia multipicta - 0.8096 0.0122 0.0361 0.2090 0.6974 Mischocyttarus cassununga 0.8297 - 0.2090 0.2090 0.9996 0.2090 Polistes simillinus 0.8371 0.6834 - 0.2090 0.0361 0.0361 Polistes versicolor 0.8065 0.6700 0.7879 - 0.2090 0.0361 Polybia fastidiosuscula 0.7466 0.6607 0.7126 0.9109 - 0.2090 Polybia platycephala 0.7990 0.6531 0.7825 0.8487 0.8229 - between pairs of species differed statistically, that is, with low value of temporal niche overlap (Table 3). These results are similar to those of social wasps sharing the same food re- source (Santos & Presley, 2010), again suggesting a tendency of co-existence between species of this group. Social wasps are important predators of insect herbi- vores and preserving their diversity can contribute signifi- cantly to reduced application of chemical pesticides in urban forestry. 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