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Neotrop. Entomol. vol.35 no.6 Londrina Nov./Dec. 2006
Occurrence of Aglae caerulea Lepeletier & Serville (Hymenoptera: Apidae: Euglossini) in the Parque Nacional da Chapada dos Guimarães, Mato Grosso State, Brazil
Orrência de Aglae caerulea Lepeletier & Serville (Hymenoptera: Apidae: Euglossini) no Parque Nacional da Chapada dos Guimarães, MT
Evandson J. dos Anjos-SilvaI; Evandro CamilloII; Carlos A. GarófaloII
IDepto. Biologia, UNEMAT Univ. do Estado de Mato Grosso, C. postal 242, Cáceres, MT, Programa de Pós-Graduação em Entomologia, FFCLRP-USP, email@example.com
IIDepto. Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto-USP, 14040-901, Ribeirão Preto, SP, firstname.lastname@example.org, email@example.com
In a study conducted in the gallery forest of the Vale doVeu de Noiva in the Parque Nacional da Chapada dos Guimarães, Mato Grosso state, chemical baits were used to attract and sample male orchid bees. From September 2003 to July 2005, male euglossine bees were captured monthly, from 8:00 a.m. to 4:00 p.m. as they arrived at the baits. Of the 264 males captured, eight males belonged to Aglae caerulea Lepeletier & Serville, a cleptoparasitic euglossine species that presumably occurred only in the Amazon basin. Therefore, the occurrence of A. caerulea in this study area extends its geographical distribution range by approximately 2,400 km southwards in South America, as it is now recorded in both the Amazon and Platina basins.
Key words: Apinae, orchid bee, Neotropics
Em um estudo conduzido em uma floresta de galeria do Vale do Véu de Noiva no Parque Nacional da Chapada dos Guimarães, MT, substâncias puras foram utilizadas para atrair e amostrar machos das abelhas das orquídeas. De setembro de 2003 a julho de 2005, uma vez por mês, das 8:00h às 16:00h, os machos foram capturados conforme eles chegavam às iscas-odores. Dos 264 machos coletados, oito eram Aglae caerulea Lepeletier & Serville, uma espécie cleptoparasítica com distribuição geográfica restrita à Bacia Amazônica. Portanto, a ocorrência de A. caerulea naquela área de estudo amplia aproximadamente em 2.400 km os limites para o sul da América do Sul, estando agora documentada sua presença tanto na Bacia Amazônica como na Bacia Platina.
Palavras-chave: Apinae, abelha das orquídeas, Neotropical
The Euglossini comprises three pollen-collecting genera, Euglossa Latreille, 1802, Eulaema Lepeletier, 1841 and Eufriesea Cockerell, 1908, and two cleptoparasitic genera, Exaerete Hoffmannsegg, 1817 and Aglae Lepeletier & Serville, 1825 (Moure, 1964, 1967; Kimsey 1979). Euglossa contains the highest number of species and they are found from Mexico to Paraguay, northern Argentina and also in Jamaica. Eufriesea is the most broadly distributed genera, with specimens ranging from Mexico to central Argentina, and Eulaema occurs from Rio Grande do Sul (Wittmann et al. 1988) (Brazil), Missiones (Argentina) and Paraguay to central Mexico (Moure 1967, Michener 2000, Cameron 2004). Of the two cleptoparasitic genera, Exaerete has a broader geographic range, going from Mexico to northern Argentina (Moure 1967, Kimsey 1979).
The species of this genus are known to parasitize Eulaema and Eufriesea nests (Ducke 1903, 1906; Friese 1941; Bennett 1972). Aglae is a monotypic genus, represented by Aglae caerulea Lepeletier & Serville, 1825, reported to be a cleptoparasite of Eulaema. The lectotype is a female from French Guiana currently deposited in the Turin Museum, Italy (Moure 1967). The single observation on the parasitic behavior of this species was made by Myers (1935), in Yupukari, Rupununi District of British Guiana. He noticed a large, beautifully metallic green bee buzzing loudly as it hovered at a nest entrance of Eulaema nigrita Lepeletier, 1841, and subsequently entering the nest. From the 11 cells found in that nest, two A. caerulea males emerged sometime later.
The available information indicates that this species occurs in the Amazon rainforest of northern Bolivia, western Colombia, French Guiana, British Guiana, Peru, Venezuela, Suriname and Panama (Moure 1967, Williams & Dodson 1972, Ramírez et al. 2002). According to Cameron (2004) however, the Panamanian record of A. caerulea (Moure 1967) should be disregarded until proven otherwise, given that no one has managed to collect another sample of this species in decades of species surveys. More recently, Morato (2001) reported the occurrence of A. caerulea in the Parque Nacional da Serra do Divisor, situated at the western part of the state of Acre.
The goal of this study is to record, for the first time, the presence of A. caerulea outside the Amazon basin.
The study was conducted in the gallery forest of the Vale do Véu de Noiva in the Parque Nacional da Chapada dos Guimarães (15º24'21"S 55º50'12"W), southern Mato Grosso State. The Planalto dos Guimarães is the natural boundary between the Amazon, Platina and Araguaia basins and represents the extreme northeastern boundaries of the Alto Paraguai basin, which altitude ranges from 300 m to 836 m, annual rainfall from 1750 mm to 2000 mm, and annual temperature from 13ºC to 30ºC (PCBAP 1997).
From September 2003 to July 2005, male euglossine bees were collected monthly with an insect collecting net as they arrived at the chemical baits. A total of eight chemicals were used: in the first year benzyl benzoate, 1,8 - cineole, eugenol and vanillin were used and methyl acetate, methyl cinnamate, methyl salicylate and benzyl acetate were used in the second year. The baits were simultaneously applied to absorbent paper pads from 8:00 a.m. to 4:00 p.m. These paper pads were suspended 5.0 m apart from the twigs by a string 1.5 m above the ground. Vanillin and methyl cinnamate crystals were dissolved in water and ethyl alcohol respectively until the saturation point was reached. All paper pads were replenished every 60 min with 1 ml of chemical to prevent losses due to volatility. The collected males were placed in a killing jar containing ethyl acetate and then transferred to plastic vials labeled with the collection date and the bait used. Voucher specimens of all bee species were deposited in the collection of the Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto-USP.
In the first year, the baits attracted 177 males distributed among four genera and 21 valid species: Eufriesea (3 species), Euglossa (14 species), Exaerete (1 species) and Eulaema (3 species). Of the Eulaema species, E. nigrita males (n = 20) were collected from September to December 2003, and in February, April and July 2004; E. cingulata (Fabricius, 1804) males (n = 11) visited the baits in October 2003 and from January to April 2004; finally, the E. aff. cingulata males (n = 25) were sampled in October and November 2003 and from January to August 2004.
In the second year, 87 males belonging to 12 valid species and five genera were collected: Eufriesea (1 species), Euglossa (4 species), Exaerete (2 species), Eulaema (4 species) and Aglae (1 species). Of the 87 males captured, 16 males were of the Eulaema species. The E. cingulata males (n = 9) were sampled in October and December 2004 and in January, February, May and July 2005; the single E. bombiformis male (Packard, 1869) was collected in October 2004; the two E. meriana males (Olivier, 1789) were attracted in September 2004 and May 2005 and the E. aff. cingulata males (n = 4) were sampled in September 2004 and January and July 2005. The A. caerulea males (n = 8) were collected in October 2004 (n = 1) and in February (n = 4), March (n = 2) and May (n = 1) 2005. All A. caerulea males were attracted to methyl cinnamate baits.
As reported by Williams & Dodson (1972) and Morato (2001), this study also showed that methyl cinnamate baits attract A. caerulea males, indicating that these males have a strong preference for this fragrance. However, Otero & Sandino (2003) collected an A. caerulea male using cineole, methyl salicylate and skatole as baits while studying the differences in euglossine bee community structure through a human intervention gradient, at a lowland site in the Chocó biogeographic region of Colombia. Although the authors have not stated which bait attracted the male, its capture shows that methyl cinnamate is not the only fragrance associated with A. caerulea males.
The number of A. caerulea males collected together with the presence of E. nigrita, the only host species known of A. caerulea (Myers 1935), in the Parque Nacional da Chapada dos Guimarães, exclude the hypothesis of casual occurrence of this cleptoparasitic species in this region. Additionally, it is possible that other Eulaema species sampled in that area are also A. caerulea hosts. This supposition is reinforced by the results obtained by Otero & Sandino (2003), who collected one A. caerulea male in an area where at least four Eulaema species also occur: E. aff. bombiformis, E. chocoana Ospina & Sandino, 1997, E. cingulata and E. sororia Dressler & Ospina, 1997. Regardless of whether this suggestion is correct, our results show that the geographical distribution range of Aglae increased by approximately 2,400 km southwards in South America and Aglae is now recorded in both the Amazon and Platina basins.
According to Pinto & Oliveira-Filho (1999), the floristic composition of the gallery forest, also known as riparian forest (Rizzini 1997) or the valley-forest (Eiten 1994), where this study was done, showed strong links with both the Amazon and Atlantic (sensu lato) forests. Of the 172 species sampled, 12.2% of the species occur only in Cerrado, 29.7% of them occur in the Atlantic forest, 28.5% occur in the Amazon forest, and the remaining 29.6% of the species are found in both forests. It has been suggested (Sick 1966, Willis 1992) that gallery forests, one of the most common ecosystems found in Central Brazil (Ab'Sáber 1971), play an important role as mesic corridors, that open the way to the colonization of the Cerrado landscapes by forest-dependent plants and animals with ranges centered in the neighboring Amazon and Atlantic forests. As reported by Silva (1996), studies on the distribution patterns of plants (Ratter 1987, Méio et al. 2003), butterflies (Brown 1987), mammals (Redford & Fonseca 1986), birds (Willis 1992, Silva 1996) and lizards (Vanzolini & Williams 1970) have provided numerous examples of Amazon and Atlantic organisms whose range boundaries are located in the gallery forests within the Cerrado domains. Therefore, although the presence of Aglae in the Chapada dos Guimarães National Park can be surprising, its occurrence there shows only one more example of the influence of the Amazon forest, in the composition of the fauna of the Cerrado domains.
The authors thank FA Labaig for the technical assistance with the collections. An anonymous referee reviewed the manuscript providing useful comment. This work was sponsored by CAPES-Brazil (PQI 0053/02-3) and CNPq-Brazil (EU 473857/03-0). EJAS received a research grant from CAPES-Brazil.
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