Research Article
Research Article
Natural enemies of the oil-collecting bee Centris analis (Fabricius, 1804) with notes on the behavior of the cleptoparasite Coelioxys nigrofimbriata Cockerell, 1919 (Hymenoptera, Apidae)
expand article infoDaniele Regina Parizotto
‡ Universidade Federal Rural de Pernambuco, Recife, Brazil
Open Access


This work presents a review of natural enemy species associated with Centris analis and summarizes the available information on life history, behavior, diversity, and specialization of these taxa. Records include over 20 species in ten genera from seven distinct families of Hymenoptera, Diptera and Coleoptera. These species are cleptoparasites or parasitoids of immature stages or adults. Some species seem to be occasional parasitoids, while others seem to be more frequent and responsible for significant mortality rates of immatures in nests. Three families of Hymenoptera represent the majority of natural enemy taxa found in C. analis nests: Apidae, Chrysididae, and Leucospidae. The most frequent parasitoid reared from nests was the wasp Leucospis cayennensis Westwood, followed by cleptoparasitic bee species of the genus Coelioxys Latreille. Vouchers of trap nest studies are identified for the first time and refer to Coelioxys nigrofimbriata Cockerell, which seems to have a strong association with nests of C. analis. Further direct observation notes about biology and behavior of C. nigrofimbriata are also provided.


Centridini, host, Neotropical region, nesting, parasite


Centris analis (Fabricius) is a solitary, oil-collecting bee with a broad geographic range that extends from central Mexico to southern Brazil (Moure and Melo 2012). It is often recorded in trap-nest surveys in various Brazilian biomes such as the Atlantic rainforest, caatinga, and cerrado (Jesus and Garófalo 2000; Aguiar and Martins 2002; Aguiar et al. 2005; Oliveira and Schlindwein 2009; Dórea et al. 2010; Rabelo et al. 2014; Moure-Oliveira et al. 2017). These bees are multivoltine, polylectic, and effective pollinators of native plants as well as crops (Dórea et al. 2010; Vilhena et al. 2012). These features led C. analis to be considered as a manageable pollinator in cultures such as acerola (Malpighia emarginata, Malpighiaceae), increasing orchard productivity and reducing pollination deficit (Oliveira and Schlindwein 2009; Magalhães and Freitas 2013). However, studies necessary to make its commercial use feasible are still lacking, including aspects of its life history, physiology, nesting preferences, population genetics, and natural enemies (Bosch and Kemp 2002; Oliveira and Schlindwein 2009; Alonso et al. 2012). This work aims to contribute an overview of the parasitoid and cleptoparasitic species known to attack C. analis, including data about distribution, biology and behavior of natural enemies, and direct observation notes on the behavior of the cleptoparasite Coelioxys nigrofimbriata attacking C. analis trap nests in Pernambuco, northeastern Brazil.

Material and methods

Field observations

Weekly observations of behavior of adults of Coelioxys nigrofimbriata were conducted on trap nests set up at commercial orchard Acerolândia, municipality of Paudalho, Pernambuco, Brazil, from November 2016 to December 2017. Two models of trap nests were used: compact and observation trap-nests. The compact nests were constructed with black cardboard with one end closed and inserted in wood blocks (modified from Garófalo et al. 1989). Each set contained 30 tubes, for a total of 240 cavities distributed in eight blocks. The observation trap nests consisted of linear cavities in wood blocks covered with a transparent plastic sheet fixed with a screw (modified from Cane 2004). Five sets were constructed with 30 tubes each, for a total of 150 cavities. The adult specimens that emerged from these nests were deposited in the entomological collection of the Department of Agronomy, Universidade Federal Rural de Pernambuco (CERPE), Recife, Brazil.

Natural enemies of Centris analis

The many natural enemies of bees include parasites, commensals, predators, or scavengers of various organism groups including fungi, nematodes, mites and insects (Wcislo and Cane 1996). There are only records of cleptoparasite or parasitoids species (ectoparasitoids of immature stages or endoparasitoids of adults) attacking C. analis. The cleptoparasite females lay eggs in nest cells, and their larvae consume both the host bee’s food provision and the host egg or larva (Michener 2007; Groulx and Forrest 2018). Parasitoids lay eggs within or adjacent to bee larvae or eggs and their larvae develop and consume the bee larva or adult (Yeates and Greathead 1997).

Results and discussion

The literature survey results indicate there are at least 22 species of natural enemies of C. analis in three orders of insects: Hymenoptera (3 families and 5 genera), Diptera (3 families and 3 genera) and Coleoptera (1 family and 2 genera) (Table 1). These species can produce 1 to 30% mortality rates in trap-nest studies and can be significant especially in aggregation nests (Aguiar and Martins 2002; Gazola and Garófalo 2003; Alonso et al. 2012). Besides parasitism, Jesus and Garófalo (2000) and Alonso et al. (2012) registered high mortality rates for immature C. analis in artificial trap-nests, with up to 60% due to unknown causes. A summary of general information and distribution records of natural enemies is presented below.



The tribe Ericrocidini includes 11 genera and 44 species, known only from the New World. All species of this tribe are cleptoparasites, most of them on Centris spp. (Rocha-Filho et al. 2009; Martins et al. 2017; Michener 2007), although Mesoplia Lepeletier also occurs in nests of Epicharis Klug (Rocha-Filho et al. 2008). Host associations are still poorly documented, sometimes only known from indirect observations (Michener 2007). Two species have been recorded in C. analis nests: Aglaomelissa duckei Snelling & Brooks, 1985 and Mesocheira bicolor Lepeletier & Serville, 1825.

Aglaomelissa Snelling and Brooks is a monotypic genus known from Costa Rica and northern South America (Michener 2007, Moure and Melo 2012). Rocha-Filho et al. (2009) reported that A. duckei emerged from nests of two species of Centris (Heterocentris) in the Brazilian Amazon: Centris analis and C. terminata. Considering the abundance and distribution of C. analis, A. duckei may be an important parasite in the Amazon region. However, because of the scarcity of information on A. duckei hosts, it is not possible to indicate how often this parasitic species attacks C. analis, or whether it is specific to Centris (Heterocentris).

Mesocheira Lepeletier and Serville is also a monotypic genus that occurs throughout the Neotropics, from Mexico to Paraguay. Mesocheira bicolor is frequently reported in trap nest studies but little is known about its cleptoparasitic behavior, biology and specificity. This species was recorded parasitizing both Centris (Hemisiella) and Centris (Heterocentris) species, as follows: C. dichrootricha Moure, 1945, C. nitida Smith, 1874, C. tarsata Smith, 1874, C. trigonoides Lepeletier, 1841 and C. analis Fabricius, 1804 (Parker 1977; Morato et al. 1999; Jesus and Garófalo 2000; Aguiar and Martins 2002; Gazola and Garófalo 2002; Aguiar and Garófalo 2004; Aguiar et al. 2005). Centris analis is the only species of this list in subgenus Centris (Heterocentris), and the parasitism rates were low considering the wide distribution and the relative frequency of M. bicolor in trap-nesting bee studies. In observations performed in trap-nests set in the municipality of Paudalho, Mesocheira bicolor females only attacked nests of C. tarsata, even though the abundance of C. analis nests was much higher in the studied area. Similar patterns were reported by Araújo et al. (2018) and Oliveira-Rebouças et al. (2018). The apparent preference of M. bicolor for C. (Hemisiella) nests may be due to the type of material used by female hosts to construct and/or provision the brood cells. The species of this subgenus are known to use a mixture of sand and oils (Vinson et al. 1996; Morato et al. 1999; Pereira et al 1999) while C. (Heterocentris) females tend to use plant material and oils (Jesus and Garófalo 2000; Aguiar and Garófalo 2004; Oliveira and Schlindwein 2009). The low rates of parasitism could also be due to the differences in larval foods stored in brood cells. The cell provisions of C. analis consist of pollen and nectar without floral oils, which may be a characteristic of the subgenus (Jesus and Garófalo 2000; Aguiar and Garófalo 2004), while C. tarsata females use a mixture of pollen, nectar, and oil (Aguiar and Garófalo 2004). Based on the available information, it seems M. bicolor is not an effective parasite of C. analis, with only occasional occurrence in nests of this species.


The tribe Megachilini includes a large number of taxa with great morphological and behavioral diversity. Most of the cleptoparasitic species belong to the cosmopolitan genus Coelioxys, which includes over 200 species in South America (Moure et al. 2012, Michener 2007). Most Coelioxys spp. are cleptoparasites of Megachile, although there are records of parasitism of other genera of both Megachilinae and Apinae, including Centris (Rocha-Filho and Packer 2015; Michener 2007).

Coelioxys spp. have often been recorded as parasites of C. analis in samples with trap nests (Table 1). In most of these studies, one single species of Coelioxys was observed parasitizing C. analis nests, but in several of them the species is not identified due to the lack of taxonomic studies of the genus (Rocha-Filho 2015). The present work reports on vouchers identified to species level for the first time. All specimens examined belonged to Coelioxys nigrofimbriata (see references in Table 1). Only Aguiar and Martins (2002) and Gazola and Garófalo (2009) found more than one Coelioxys species attacking C. analis nests in the same area; two and three, respectively. The material from Gazola and Garófalo (2009) identified as Coelioxys aff. uhleri from Estação Ecológica de Paulo de Faria actually corresponds to C. nigrofimbriata. The other two species reported by Gazola and Garófalo (2009), the material of Aguiar and Martins (2002) and also the other surveys listed in Table 1 as Coelioxys spp. could not be examined to confirm the identification at this time.

Table 1.

Summary of records of Centris analis natural enemies.

Taxa Locality References
Aglaomelissa duckei BRAZIL: Acre Rocha-Filho et al. 2009
Mesocheira bicolor BRAZIL: São Paulo Jesus and Garófalo 2000; Gazola and Garófalo 2002; Couto and Camillo 2007
Coelioxys nigrofimbriata BRAZIL: Pernambuco, This study
BRAZIL: São Paulo Jesus and Garófalo 2000; Gazola and Garófalo 2002; Couto and Camillo 2007; Gazola and Garófalo 2009
Coelioxys spp. BRAZIL: Minas Gerais Araújo et al. 2018
BRAZIL: Paraíba Aguiar and Martins 2002
BRAZIL:Paraná Oliveira and Gonçalves 2017
BRAZIL: São Paulo Gazola and Garófalo 2009; Araújo et al. 2018;
Chrysis sp. BRAZIL: Paraná Oliveira and Gonçalves 2017
Leucospis bulbiventris COSTA RICA: Guanacaste Cooperband et al. 1999
Leucospis cayennensis COSTA RICA: Guanacaste Cooperband et al. 1999
BRAZIL: São Paulo Jesus and Garófalo 2000; Gazola and Garófalo 2002, 2003, 2009; Couto and Camillo 2007; Alonso et al. 2012; Moure-Oliveira et al. 2017
Leucospis spp. BRAZIL: Paraná Oliveira and Gonçalves 2017
BRAZIL: São Paulo Gazola and Garófalo 2009
BRAZIL: Bahia Oliveira-Rebouças et al. 2018
Anthracini BRAZIL: São Paulo Rocha-Filho et al. 2017
Anthrax oedipus BRAZIL: São Paulo Gazola and Garófalo 2009
Anthrax macquarti BRAZIL: São Paulo Gazola and Garófalo 2009; Moure-Oliveira et al. 2017; Araújo et al. 2018
Anthrax spp. BRAZIL: Minas Gerais Araújo et al. 2018
Physocephala aurifrons BRAZIL: São Paulo Santos et al. 2008; Couto and Camillo 2014
Physocephala benneti BRAZIL: São Paulo Santos et al. 2008; Couto and Camillo 2014
Physocephala bipunctata BRAZIL: São Paulo Couto and Camillo 2014
Physocephala cayennensis BRAZIL: São Paulo Santos et al. 2008; Couto and Camillo 2014
Physocephala inhabilis BRAZIL: São Paulo Couto and Camillo 2014
Physocephala rufithorax BRAZIL: São Paulo Santos et al. 2008; Couto and Camillo 2014
Physocephala soror BRAZIL: São Paulo Santos et al. 2008
Physocephala spheniformis BRAZIL: São Paulo Santos et al. 2008; Couto and Camillo 2014
Physocephala sp. BRAZIL: São Paulo Santos et al. 2008
Melaloncha sp. São Paulo: BRAZIL Ament et al. 2014
Nemognatha sp. São Paulo: BRAZIL Gazola and Garófalo 2009
Tetraonyx sp. Amazonas: BRAZIL Morato et al. 1999

Behavior of Coelioxys nigrofimbriata. This species was described from the state of Amazonas, Brazil, but the observation of specimens in trap-nest studies demonstrated that it is widely distributed in Brazil, occurring from Amazonas to Paraná. Coelioxys nigrofimbriata females usually hover in front of the trap nests to locate a nest that is being provisioned. Often, only one or two females of the cleptoparasite bee were seen at the same time in the wooden blocks. The parasite enters, inspects and deposits an egg when the host female is absent. When the amount of larval food is not sufficient, the parasite leaves the nest, lands near the nest entrance and waits for the host to deposit more pollen (up 70 min, according to Gazola and Garófalo 2002). This behavior of ovipositing into open cells, and waiting near the entrance agrees with the general patterns described for the genus (Scott et al. 2000, Michener 2007, Vinson et al. 2011). The females of C. nigrofimbriata were observed within 3 to 20 cm of the nest, with the head directed towards the nest entrance, similar to what was described for Coelioxys chichimeca Cresson, 1878 (Vinson et al. 2011). Females of C. analis that returned from foraging trips expelled parasites that were close to their nests. However, the parasites would return a few minutes later and repeat the behavior. The observations described here agree with the remarks made by Gazola and Garófalo (2002) (cited as Coelioxys sp.).

Centris analis was active throughout the year, with nest construction recorded in every month except June and July, while the C. nigrofimbriata attacks occurred between November and May. Centris analis built 116 nests during the study period, of which 28 were attacked by C. nigrofimbriata. Of the 116 nests, 97 were built during the hot and wet season, with the highest frequency occurring in March (n=46). These nests produced 274 individuals of the host species and 32 C. nigrofimbriata. The number of brood cells constructed by C. analis per nest ranged from one (n= 19) to nine cells (n= 1), with four (n=22) and five (n= 22) cells being the most abundant. Of the 28 nests attacked by cleptoparasite bees, 24 produced only one parasite, and four produced two parasites. The highest frequencies of attacks occurred in the months that C. analis had the highest nesting frequencies (January, March and April) (Figure 1). Coelioxys nigrofimbriata parasitized exclusively nests of C. analis even though there were also nests of C. tarsata in the same area. These data demonstrated that parasitism activities of C. nigrofimbriata were strongly synchronized and dependent on the construction of nests by C. analis.

Figure 1. 

Number of Centris analis nests built and number of nests attacked by Coelioxys nigrofimbriata from January to December 2017.


Chrysididae is a diverse and cosmopolitan family that includes about 3000 species in 80 genera. The biology of chrysidids is still poorly known, with few studies about their hosts (Tormos et al. 1996). The group is classified in four subfamilies known for attacking Phasmatodea as well as other Hymenoptera such as Diprionidae, Tenthredinidae, bees and solitary wasps (Soon and Sarma 2011; Melo et al. 2012). Most species of the subfamily Chrysidinae are parasites of bee and wasp larvae or are cleptoparasites of larval provisions of their hosts (Morgan 1984; Melo et al. 2012). Most hosts are solitary wasps that build mud-pot nests or that use preexisting cavities in soil or wood, such as Vespidae, Sphecidae, Crabronidae, and Megachilinae (Pärn et al. 2015; Kimsey 2006; Torretta 2015). The genus Chrysis L. is largest genus of the group, but there is little information about their host species. Species of Chrysis are known to have various levels of host specialization (Pärn et al. 2015). The only record of a Chrysis species parasitizing a nest of C. analis was recently published by Oliveira and Gonçalves (2017) in southern Brazil. The data indicates that this species is a non-specific parasite in C. analis nests, as these authors also recorded the same species of Chrysis attacking nests of Megachile susurrans Haliday, 1836 and three species of VespidaeMonobia angulosa Saussure, 1852, Pachodynerus guadulpensis (Saussure, 1853) and Pachodynerus grandis Willink & Roig-Alsina, 1998.


This family of chalcidoid parasitoids includes four genera and about 141 species distributed worldwide (Lima and Dias 2018; Melo et al. 2012; Noyes 2017), most of them in the genus Leucospis Fabricius, with approximately 120 described species and 45 known to occur in the Neotropical Region (Noyes 2017). These wasps are larval parasitoids of solitary bees (Apidae and Megachilidae) and less frequently aculeate wasps (Sphecidae and Vespidae) (Torreta et al. 2017). Females usually use their ovipositor to drill through the cell walls of the host nest and the immature develops as an ectoparasite feeding on the fluids of the host larva. Hosts are known only for about 30 species (Grissell and Cameron 2002), four of which were reported from nests of C. analis: Leucospis bulbiventris, L. cayennensis, L. manaica, and L. sp. (Table 1). Among these species, L. cayennensis is the most common natural enemy of C. analis (Boucek 1974; Gazola and Garófalo 2003). This species also was reported in nests of Centris tarsata Smith, 1874 (Chandler et al. 1985), Centris bicornuta Mocsáry, 1899, Centris nitida Smith, 1874, Centris vittata Lepeletier, 1841 (Cooperband et al. 1999), Centris labrosa Friese, 1899 (Gazola and Garófalo 2003), Tetrapedia diversipes Klug, 1810 (Camillo 2000) and Tetrapedia curvitarsis Friese, 1899 (Gazola and Garófalo 2003).

Leucospis cayennensis is widely distributed from Mexico to Argentina. However, the frequency of attacks on nests of C. analis is not homogeneous throughout this distribution. This species was associated with nests of C. analis only in Costa Rica and the states of Paraná and São Paulo in Brazil (Table 1). The highest rates were observed in studies conducted in São Paulo (Gazola and Garófalo 2002, 2003), with 25% of cell parasitism by L. cayennensis. This variation, in addition to the records of L. cayennensis in nests of many others species (Torreta et al. 2017), suggests that this wasp is not specific to C. analis. However, Leucospis cayennensis may still have an important role as natural enemy of C. analis in aggregations of trap-nests due to their behavior. Gazola and Garófalo (2003) reported that the parasitoid females may repeatedly return to the nesting area for several days and that a single female can attack up to 24 nests. More details about the biology of this species can be found in Gazola and Garófalo (2002, 2003).



Bombyliidae is one of the largest families of true flies with over 5000 described species. Their representatives are most abundant and diverse in arid and semiarid regions of the world, with about 450 species in the Neotropical Region (Ávalos-Hernández et al. 2014; Yeates and Greathead 1997; Carvalho et al. 2012). Anthrax Scopoli is also a diverse taxon, with 248 species worldwide, whose immature stages are all ectoparasitoids of larvae and pupae of holometabolous insects living in tubular nests or cells (Marston 1970, Ávalos-Hernández et al. 2014). Yeates and Greathead (1997) listed 70 species as ectoparasitoids of larvae and pupae of bees and wasps, and over 300 host records, but available information about host preferences and specificity for the genus is still scarce (Marston 1970). Among the bees, six studies recorded three species of Anthrax in nests of C. analis (Table 1). In all these trap-nest studies, Anthrax species seemed to be generalist, emerging from nests of C. analis as well as other species of bees and wasps. No additional data was found on the parasitic behavior of Anthrax in nests of C. analis.


Conopidae is a widespread family of flies with about 780 species and 56 genera (Carvalho et al. 2012). The larvae of species for which biology is known are obligatory endoparasitoids of other insects. Representatives of three subfamilies (Conopinae, Myopinae and Dalmanniinae) are known as internal parasites of aculeate Hymenoptera, and some species may have a negative effect on populations of pollinators (Gibson et al. 2013; Melo et al. 2008). Females attack adult bees, inserting an egg on or within the bee’s abdomen while they are foraging, or in flight. The larva develops inside the abdomen of the host, feeding on internal tissue and hemolymph, and pupates in situ, killing the host (Santos et al. 2008).

Species of the genus Physocephala Schiner are solitary koinobiont endoparasitoids of several genera of bees such as Anthidium Fabricius, Anthophora Latreille, Apis Linnaeus, Bombus Latreille, Centris Fabricius, Epicharis Klug, Eulaema Lepeletier, Euglossa Latreille, Halictus Latreille, Megachile Latreille, and Xylocopa Latreille (Rasmussen and Cameron 2004; Melo et al. 2008; Santos et al. 2008; Couto and Camillo 2014). Santos et al. (2008) reported on conopid flies attacking C. analis and recorded nine species of Physocephala in southeastern Brazil (Table 1). Couto and Camillo (2014) also recorded eight Physocephala species emerging from dead specimens of C. analis. Couto and Camillo (2014) also observed that parasitized females present behavioral changes, and deposited extra oil on the nest occlusion or closed empty nests. These parasitic associations do not appear to be specific, but impact the behavior of the female bees. Behavior data for C. analis are still scarce, but these parasitic flies can have a high incidence of attacks and decrease bee populations as reported for Bombus spp. by Abdalla et al. (2014) and Malfi et al. (2014).


Phoridae is a cosmopolitan family of flies with over 4000 described species (Brown and Smith 2010). Many species are well known as parasitoids of corbiculate bees such as stingless bees, bumblebees and honey bees (Lucia et al. 2013; Ament et al. 2014). There are also records of species of Melaloncha Brues attacking Augochlorini (Halictidae) (Wcislo et al. 2004), Centridini (Apidae) and Euglossini (Apidae) species (Ament et al. 2014). The genus occurs only in the Neotropical Region and comprises the largest group of bee-killing parasitoids, with 167 described species. Female flies attack bees by injecting an egg into their body through the membrane between sclerites and the larvae develop as internal parasitoids, consuming and killing the hosts (Brown 2004; Brown and Smith 2010; Brown 2016). The record is exceptional and it is based on the observation of a puparium removed from the mesosoma of a Centris analis (Ament et al. 2014).



Meloidae is a family of beetles that includes almost 2500 species in approximately 120 genera. Meloid larvae are known as parasites of grasshoppers and larvae of Apoidea or other aculeate Hymenoptera (Bologna and Pinto 2001; Lückmann and Assmann 2006). The family has a distinctive form of metamorphosis, with the presence of a triungulin first instar in most taxa. This first instar, depending on the group, feeds on eggs of Acridoidea or provisions and larvae of Apoidea or other aculeate Hymenoptera. In the taxa that attack apoid hosts, the triungulin is phoretic, and is taken to the larval food indirectly by the adult bees that visit flowers (Bologna and Pinto; 2001). Some species have been documented as parasites of Melitoma Lepeletier and Serville (Roubik 1989), Epicharis Klug (Gaglianone 2005), Monoeca Lepeletier and Serville (Rozen et al. 2006) and Eufriesea Cockerell (Kamke et al. 2008). Tetraonyx Latreille (Morato et al. 1999) and Nemognatha Illiger (Gazola and Garófalo 2009) were recorded in C. analis nests trap-nest surveys, but without species-level identification, information about the biology or parasitic behavior.


Although there are many studies about the life history of C. analis (see Jesus and Garófalo 2000; Alonso et al. 2012; Couto and Camillo 2014), much still needs to be described, especially regarding interactions with natural enemies. With the exception of the detailed observations made by Gazola and Garófalo (2003) about L. cayennensis, little is known about behavioral strategies of species attacking C. analis. Most records are scattered, and lack information about biology and parasitism rates (Wcislo and Cane 1996). Aspects such as parasite-host synchronicity and the effects of the presence of multiple natural enemies on the same populations of C. analis need to be better investigated. In addition, up to 70% of the mortality rates in immature stages of the trap nests are due to unknown causes (Oliveira and Schlindwein 2009; Alonso et al. 2012). Bacteria, fungi, mites and viruses may be responsible for part of this mortality in C. analis, but are still unknown. Pathogenic fungi, for example, are known to cause diseases in solitary bees (Megachile rotundata and Osmia spp.) leading to high levels of mortality in managed populations (Bosch and Kemp 2002).

The present work aimed to summarize available information on natural enemies and contribute to the taxonomic identification of the Coelioxys spp. that attack C. analis (Table 1). The new data about distribution, biology and behavior of Coelioxys nigrofimbriata provide a new perspective on the intricate relationships between host and cleptoparasitic bees. The other species of natural enemies of C. analis listed here do not seem to have this strong association. However, some of them can also reach high parasitism rates, such as Leucospis cayennensis. Therefore advanced studies about natural enemies of Centris analis are necessary to make commercial rearing feasible. As pointed out by Bosch and Kemp (2002) the mortality levels often decrease as knowledge on the developmental biology of the pollinator increases, and rearing methods are improved.


The author would like to thank Nadia Carneiro Lacerda for allowing the field observations on private property, and Léo Correa da Rocha-Filho for the identification of Coelioxys nigrofimbriata, comments and suggestions on a previous version of this paper. I also thank the Laboratório de Escrita Científica (Ana Dal Molin and Karin Fehlauer-Ale) for the help with the English version of this manuscript. This study was supported by CNPq (Process DCR– 300501/2016–1) and FACEPE (APQ, Process DCR–0013–5.01/16).


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