Diversity of frugivorous flies ( Tephritidae e Lonchaeidae ) in three municipalities in southern Bahia Diversidade de moscas frugívoras ( Tephritidae e Lonchaeidae ) em três municípios da região sul da Bahia

Arq. Inst. Biol., v.83, 1-7, e0402014, 2016 RESUMO: O principal objetivo deste estudo foi conhecer a diversidade de espécies de moscas frugívoras (Tephritidae e Lonchaeidae) em Ilhéus, Uruçuca e Wenceslau Guimarães, municípios da região sul da Bahia. No período de julho/2011 a dezembro/2012, foram instaladas cinco armadilhas do tipo McPhail em cada local de amostragem, tendo como atrativo alimentar proteína hidrolisada de milho (Bio Anastrepha©) a 5%. Os adultos capturados nas armadilhas, após a triagem, foram acondicionados em potes plásticos com álcool etílico 70% até a identificação. Cada espécie de Anastrepha foi caracterizada pelos índices de diversidade de Shannon-Wiener, Margalef e equitabilidade e categorizada quanto à sua dominância, abundância, frequência e constância na comunidade. Do total de moscas capturadas, 2,24% corresponderam a exemplares de Neosilba McAlpine (Lonchaeidae) e 97,76% a exemplares de moscas-das-frutas, com registro de 12 espécies de Anastrepha e C. capitata. O índice mosca/armadilha/dia (MAD) variou de 0 a 1,35, com maior captura nos meses de março e abril de 2012, coincidindo com o período de frutificação. Registraram-se as ocorrências de Anastrepha antunesi Lima, A. bahiensis Lima, A. consobrina (Loew), A. distincta Greene, A. fraterculus (Wied.), A. grandis (Macquart), A. leptozona Hendel, A. obliqua (Macquart), A. parallela (Wied.), A. serpentina (Wied.), A. sororcula Zucchi, A. zenildae Zucchi, Ceratitis capitata (Wied.), Neosilba glaberrima (Wied.) e Neosilba zadolicha McAlpine & Steyskal. Anastrepha fraterculus atingiu os índices máximos de dominância, frequência, constância e abundância. Registrou-se, pela primeira vez, a espécie A. consobrina no estado da Bahia.


INTRODUCTION
Frugivorous flies (Diptera: Tephritoidea) cause great economic losses to Brazilian market of fruits and vegetables due to premature fruit drop and to product devaluation for in natura consume and industrialization (Aluja;Mangan, 2008;Minzão;Uchôa-Fernandes, 2008).
The faunistic indexes (Simpson, Shannon-Wiener, Margalef, abundance, dominance, frequency and constancy) are used to characterize a community, and show that determinant factors of the degree of species abundance are usually linked to ecological components of the habitat and host richness.Some works have shown that, despite many species may be present in some areas, only one or two are considered frequent and dominant (Silveira Neto et al., 1976;Ferrara et al., 2005;Uramoto et al., 2005).Previous knowledge of ecological aspects of species present in orchards and its population dynamics through the year, amongst others faunistic parameters, are important when practicing integrated management of frugivorous flies (Aguiar-Menezes et al., 2008).
So, taking into account the importance of frugivorous flies and the diversity of native fruits in the proximities of remnants of the Atlantic forest in the region, the objectives of this paper were: broaden the knowledge about the diversity of fruit flies in southern Bahia; evaluate the faunistic indexes of Shannon-Wiener, Margalef, equitability, abundance, constancy, dominance and frequency of Tephritidae flies; and evaluate the population fluctuation using the index fly/trap/day (FTD).

MATERIAL AND METHODS
This work was carried out from July 2011 until December 2012 in three domestic orchards with diverse hosts, located in areas of Atlantic forest remnants in the municipalities of Ilhéus (14º54'S; 39º07'W; 121 m), Uruçuca (14°34'S; 39°10'W; 128 m) e Wenceslau Guimarães (21º18'S; 40º56'W; 143 m), in southern Bahia.In this region the climate is tropical hot humid, with mean annual temperature of 25ºC and relative humidity of 85%, according to data from Comissão Executiva do Plano da Lavoura Cacaueira (CEPLAC).
In each property, five McPhail traps were fixed in fruit trees approximately 1.5 m above ground.The traps contained, as food attractant, 5% corn hydrolyzed protein (Bio Anastrepha © ), and they were placed randomly at the borders of orchards next to the forest.The traps were inspected weekly and captured insects transferred to plastic vials of 50 mL containing 70% ethanol, at the same time the traps were washed and attractant renewed.The samples were labeled with the following information: date and place of collect, and strap number.Then, they were taken to the laboratory of Biologic Control of Universidade Estadual de Santa Cruz (UESC), in order to proceed the insect taxonomic identification.
Fruit flies adults sampled were counted and sexed.With the aid of optic stereomicroscope and microscope, females of Anastrepha were identified based on wing pattern (wing stripes), thorax pattern and morphometric characters of aculeo tip (Zucchi, 2000a).Males of Anastrepha and specimens of C. capitata were counted and discharged.Specimens of Lonchaeidae were identified by Pedro Carlos Strikis, a taxonomist specialized in Lonchaeidae flies.
Faunistic indexes were calculated using the software ANAFAU, developed at the Department of Entomology and Acarology from Escola Superior de Agronomia "Luiz de Queiroz", of Universidade de São Paulo (USP), Piracicaba, São Paulo.All specimen of frugivorous flies were deposited in the Entomological Collection of the Laboratory of Biological Control at UESC.Population fluctuation of fruit flies is presented by the total number of Tephritidae specimens captured monthly, and population density is expressed in FTD.

RESULTS AND DISCUSSION
In the three municipalities, 1,783 specimens of fruit flies, 1,743 specimens of Tephritidae (1,271 females and 526 males) and 40 specimens of Lonchaeidae (38 females and 2 males) were captured.
Anastrepha fraterculus was predominant in the three municipalities, corresponding to 66.45% of the captured females reaching the highest indexes of dominance, frequency, constancy and abundance (Tables 1 to 3).The highest percentage of capture of A. fraterculus is here related to the fact of its poliphagous behavior and the existence of many species of Myrtaceae (its preferred host) in sampled areas.Others studies in this region also showed the dominance of this species (Bittencourt et al., 2006a;Dutra et al., 2009;Santos et al., 2008;Santos et al., 2011) and in others regions of Brazil (Araújo et al., 2013;Uramoto et al., 2004Uramoto et al., , 2005)).
Anastrepha obliqua (11.46%), also a poliphagous species, was dominant, very abundant, very frequent and constant in Ilhéus and Wenceslau Guimarães.The occurrence of this species in the sampled areas is likely related to the presence of yellow mombin (Spondias mombin L.), hog plum (Spondias purpurea L.) (Anacardiaceae) and star fruit (Averrhoa carambola L., Oxalidaceae).These hosts were close to the places where the traps were located and are considered its preferred hosts (Zucchi, 2008).
Probably the presence of fruits of Helicostylis tomentosa (Moraceae) and guava (Myrtaceae) in Ilhéus propitiated the presence of A. bahiensis, since this fruit is the host of this species.
The specimens of A. parallela were captured in traps placed inside the Atlantic forest remnants and in areas of cocoa plantation (Theobroma cacao L.) and cupuassu (Theobroma grandiflorum L.), both belonging to family Malvaceaethere are records of this species infesting fruits of these family (Zucchi, 2000b(Zucchi, , 2008)).
The other captured species (A.distincta, A. serpentina, A. leptozona, A. antunesi, A. grandis and A. consobrina) showed low frequency in the area, presenting indexes lower than 2% (Tables 1 to 3).It is the first report of A. consobrina in Bahia; this species was recorded in the states of Maranhão, Espírito Santo, Rio de Janeiro and São Paulo (Zucchi, 2008).
The results reported in the present work confirm the poliphagous behavior of A. fraterculus, A. obliqua, A. bahiensis, A. sororcula and A. zenildae, species that have a wide geographic distribution in Brazil and are considered important pests with relevant economic impact (Zucchi, 2000a(Zucchi, , 2008)), except for A. bahiensis.
The biggest diversity of Anastrepha in Ilhéus (Shannon-Wiener=1.41),reporting 10 species, is likely related to the greater diversity of available hosts where traps were placed.In Uruçuca, the traps were placed in an orchard close to an Atlantic forest remnant, and probably this fact was responsible  1 to 3).The Shannon-Wiener index reported in this work was similar to that reported for Belmonte, in southern Bahia, that had a value of 1.35 in which nine species of Tephritidae were registered (Santos et al., 2011).
The population fluctuation of fruit flies was variable in relation to the studied areas.The greater number female capture occurred in April/2012, probably to the availability and diversity of ripening fruits [yellow sapote (Pouteria caimito Ruiz & Pav.), araçá-boi, yellow mombin, star fruit, guava e jambo-red].No specimen of Tephritidae was captured in July/2012, probably because there were no ripening fruits.This fact shows the importance of the presence of ripening fruits to the occurrence of fruit flies in an orchard (Araújo et al., 2013;Ronchi-Teles;Silva, 2005).
The FTD index showed little variation during the period of this work.In some months, the value was zero, due to the absence of fruits in the orchards.
In Uruçuca the lowest index of FTD was obtained through the sampling period (0.00 to 0.06), with a little rise during the fructification period of yellow mombin (S. mombin) (March/2012).
In Ilhéus the FTD index kept low values with rise in March and April/2012, reaching 1.17.In Wenceslau Guimarães there was a little oscillation in the number of captures females, except for April/2012, when the highest FTD index (1.35) was registered (Fig. 1).
FTD index variation was related to the availability of host fruits (Uramoto et al., 2004), with higher values during the period of fruit ripening.In this period, females oviposit in the fruits and the adults emerge in the subsequent months.After the gathering of the fruit for consumption, by the residents of the properties, the fruit flies adults emerge and migrate to other places in search for food and oviposition sites.It makes the FTD index decreases.From Lonchaeidae flies, only specimens of Neosilba were captured (38 females and 2 males).The species found were Neosilba glaberrima (Wied.)(n=1), in Wenceslau Guimarães, and N. zadolicha McAlpine & Steyskal (n=1), in Uruçuca.The highest number of captures occurred in Wenceslau Guimarães (n=28), probably because the traps were placed in an orchard of Malpighia glabra L.
It is worth noting that there is no attractant developed to date to species of Neosilba.This may underestimate the populations of Neosilba species, as well as the number of species.
The presence of N. glaberrima was already recorded for Bahia (Bittencourt et al., 2006b); this species infests different species of fruits (Lopes et al., 2008;Melo et al., 2012).Neosilba zadolicha was assigned as an important pest of citrus in the state of Mato Grosso do Sul (Uchôa-Fernandes et al., 2003), and in the region of Recôncavo Baiano this species was recorded infesting fruits of umbu-cajá (Spondias tuberosa × S. mombin) (Santos et al., 2004).Specimens of C. capitata were captured only in traps installed in the municipalities of Wenceslau Guimarães (n=7) and Ilhéus (n=8).The location, diversity and quantity of native hosts in the areas where the traps were installed were probably the factors that contributed to the predominance of species of Anastrepha and low capture C. capitata index, similar to the results obtained by Uramoto et al. (2004).

CONCLUSION
Anastrepha antunesi Lima, A. bahiensis Lima, A. consobrina (Loew), A. distincta Greene, A. fraterculus (Wied.), A. grandis (Macquart), A. leptozona Hendel, A. obliqua (Macquart), A. parallela (Wied.), A. serpentina (Wied.), A. sororcula Zucchi, A. zenildae Zucchi, Neosilba glaberrima (Wiedemann), and N. zadolicha McAlpine & Steyskal are the species of frugivorous flies reported in the southern of Bahia.For the first time A. consobrina (Loew) is reported in the state of Bahia.In this region, the genus Anastrepha Schiner was predominant in relation to Ceratitis capitata (Wied.).Anastrepha fraterculus presented the highest population level in the region.The peaks of FTD recorded for Anastrepha species were coincident with the period of ripening fruits available to oviposition and so to the development of larvae and abundant food.

Table 1 .
Faunistic analysis of Anastrepha species captured in McPhail traps in Ilhéus, July/2011 -December 2012.a greater Margalef index (1.8006) and lower number of captured species.In Wenceslau Guimarães the Margalef index was lower (0.9811), due to the dominance of A. fraterculus.The high values of Shannon-Wiener and Margalef indexes resulted from the high frequency of A. fraterculus, and the relatively high value of equitability showed an equitable distribution of abundance among species in Ilhéus and Uruçuca.The proportional number of specimens of A. antunesi, A. bahiensis, A. obliqua, A. parallela and A. sororcula decreased the dominance effect of A. fraterculus (Tables Shannon-Wiener index: 1.4149; Margalef index: 1.4288; equitability index: 0.6145; SD: super-dominant; D: dominant; ND: not dominant; sa: super-abundant; va: very abundant; c: common; d: disperse, SF: super-frequent; VF: very frequent; F: frequent; LF: low frequent; W: constant; Y: acessory; Z: incidental.for