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Rev. Bras. entomol. vol.54 no.3 São Paulo 2010
MEDICAL AND VETERINARY ENTOMOLOGY
The fauna of phlebotomines (Diptera, Psychodidae) in different phytogeographic regions of the state of Maranhão, Brazil
Fauna de flebotomíneos (Diptera, Psychodidae) em municípios de diferentes fitorregiões, no estado do Maranhão, Brasil
José Manuel Macário RebêloI, II; Roseno Viana da RochaIII; Jorge Luiz Pinto MoraesII; Cláudio Roberto Marques da SilvaIV; Francisco Santos LeonardoIII; Gildário Amorim AlvesII
IDepartamento de Biologia, Universidade Federal do Maranhão, Avenida dos Portugueses s/n, Campus do Bacanga, 65085-580 São Luís-MA, Brazil.
IILaboratório de Entomologia e Vetores, Departamento de Patologia, Universidade Federal do Maranhão, Praça Madre Deus, 2, 65025-560 São Luís-MA, Brazil. email@example.com
IIIFundação Nacional de Saúde - Distrito Sanitário de Codó. Rua 1º de Maio, 1879a, Centro, 65400-000 Codó-MA, Brazil
IVMestrado em Biodiversidade e Conservação, Universidade Federal do Maranhão, Avenida. dos Portugueses, s/n, 65085-580 Bacanga-MA, Brazil
Phlebotomine specimens were captured in domiciliary and forest environments in 47 municipalities between 1982 and 2005 with the aid of CDC light traps. A total of 91 species were found, of which four belonged to genus Brumptomyia and 87 to genus Lutzomyia, distributed among the following subgenera: Evandromyia (6), Lutzomyia (5), Micropygomyia (2), Nyssomyia (9), Pintomyia (2), Pressatia (3), Psathyromyia (6), Psychodopygus (14), Sciopemyia (4), Trichophoromyia (2), Viannamyia (2); species groups: Aragaoi (2), Baityi (1), Dreisbachi (1), Migonei (12), Oswaldoi (8), Pilosa (1), Saulensis (2), Verrucarum (4) and ungrouped (1). Species diversity was greatest in areas where there was dense evergreen seasonal forest (52 species), ombrophilous forest (31) and meridional cerrados (23) and lowest in areas with mixed forest (forest with babassu palms, cerrado and caatinga). The greatest similarity index was observed for restinga and open evergreen seasonal forest (J=0.48). Dense evergreen seasonal forest had greatest similarity with ombrophilous forest (J=0.38). The phlebotomine fauna was species rich and unevenly distributed in Maranhão, reflecting the phytogeographical complexity of the state, which is a result of the great variety of ecosystems and climate zones.
Keywords: Amazon; Babassu palm forests; Cerrado; Phlebotominae.
Espécimes de flebotomíneos foram capturados nos anos de 1982 a 2005, em ambientes domiciliares e florestais de 47 municípios, com uso de armadilhas luminosas CDC. Foram encontradas 91 espécies, sendo quatro pertencentes ao gênero Brumptomyia e 87 ao gênero Lutzomyia, distribuídas nos seguintes subgêneros: Evandromyia (6), Lutzomyia (5), Micropygomyia (2), Nyssomyia (9), Pintomyia (2), Pressatia (3), Psathyromyia (6), Psychodopygus (14), Sciopemyia (4), Trychophoromyia (2), Viannamyia (2); grupo de espécies: Aragaoi (2), Baityi (1), Dreisbachi (1), Migonei (12), Oswaldoi (8), Pilosa (1), Saulensis (2), Verrucarum (4) e não agrupada (1). A diversidade de espécies foi maior nas áreas de floresta estacional perenifólia densa (52 espécies), floresta ombrófila (31) e cerrados meridionais (23), sendo menor nas áreas de matas mistas (floresta com babaçu, cerrado e caatinga). O maior índice de similaridade foi observado entre a restinga e a floresta estacional perenifólia aberta (J = 0,48). A floresta estacional perenifólia densa apresentou maior similaridade com a floresta ombrófila (J = 0,38). A fauna de flebotomíneos mostrou-se rica e distribuída de maneira heterogênea no Maranhão, concordando com a complexidade fitogeográfica do Estado, que se manifesta na riqueza de ecossistemas e de zonas climáticas.
Palavras-chave: Amazônia; Cerrado; Cocais; Phlebotominae.
Phlebotomines are dipteran vectors of leishmaniasis and are found in all zoogeographic regions of the world. On the American continent, they are found from southernmost Canada to northern Argentina (Martins & Morales-Farias 1972; Martins et al. 1978) but are present in greater variety in the Neotropical region, where approximately 480 species have already been catalogued (Aguiar & Medeiros 2003).
Phlebotomines occurs in all Brazilian states with approximately 229 known species in the country (Aguiar & Medeiros 2003). In the state of Maranhão, phlebotomines are relatively well known. Rebêlo et al. (1996) published a preliminary list of 40 species that had been found in the state up to that time. Since then, standardized fauna surveys have been carried out in various areas, including São Luís island (Rebelo et al. 1999a; Araújo et al. 2000; Barros et al. 2000; Carvalho et al. 2000; Marinho et al. 2008) and the municipalities of Codó (Rebêlo et al. 1999b), Buriticupu (Rebêlo et al. 2000a, b) and Santa Quitéria (Martin & Rebêlo 2006). These studies provided new records and showed that many species normally found in sylvatic environments have invaded anthropic environments and adapted to the peridomicile, where they coexist with domestic animals and can enter dwellings, suck human blood and transmit leishmania (Dias et al. 2003; Oliveira-Pereira et al. 2006, 2008).
In the present study, the list published by Rebêlo et al. (1996) is updated and the distribution of phlebotomines in the various phytogeographical regions of the state of Maranhão is briefly discussed.
MATERIAL AND METHODS
Study area. The state of Maranhão, which is in the west of Northeastern Brazil, between 01º 01' and 10º 21'S and 41º 48' and 48º 50' W, covers an area of 328,630 km2, or 3.86% of the total area of Brazil. It has a coastline of 640 km and shares borders with the states of Piauí to the east (1365 km), Pará to the west (798 km) and Tocantins to the southwest (1,060 km). It has a number of different phytogeographic regions (Fig.1), which are classified as follows by the IBGE (Brazilian Institute of Geography and Statistics) (1984):
DESF - Dense evergreen seasonal forest is found in the northwest of the state, where there is a hot, humid equatorial climate with a mean annual temperature of 26°C, mean relative humidity of 80% and annual rainfall of 1,800 to 2,200 mm3.
OESF - Open evergreen seasonal forest is also found in the northwest of the state but forms a mixed zone of OESF/B (open evergreen seasonal forest with babassu palms) in the central region and OESF/B/C (open evergreen seasonal forest with babassu palms and cerrado [savanna-like grasslands]) to the east. These mixed zones have a semi-humid climate, with annual rainfall between 1,400 and 1,800 mm3.
OF - Ombrophilous forest is primary forest in the interior of São Luís island, and is most common around the springs of the main watercourses. RE - Restinga (sandy coastal strips and their characteristic vegetation) is located behind the dunes along the northeastern coast of the state; and CC - Cerrado with fragments of caatinga (an area with xerophilous spiny trees and shrubs) is found in the Lower Parnaíba region, in the Northeast of the state.
MC - Meridional cerrado covers the eastern and southern regions of the state from the springs of the Grajaú and Mearin rivers to the upper reaches of the Balsas and Parnaíba rivers. It covers an area of 9,800 ha and has two different physiognomies (cerradão [forest savannah] and cerrado), the latter being the more common (Eiten 1994). The climate is more arid, with mean annual rainfall of approximately 1,000 to 1,200 mm3. RE occupies a large area where it meets the lençóis maranhenses (coastal dune fields) and is limited to the east by mixed zones of CC in the Lower Parnaíba region. OF, which is considered a remnant of the Amazon forest, is found on São Luís island, where it helps to preserve a large green area and springs.
The study area itself consisted of 291 locations, including fragments of secondary vegetation and modified primary forest, in 47 municipalities in the phytogeographic regions referred to above. These locations were chosen because they contain foci for transmission of leishmaniasis.
Data collection. The phlebotomines were captured during the period 1982 to 2005 (from a minimum of one collection to a maximum of 12 collections over a period of one year, always between 6 pm and 6 am) using CDC (Centers for Disease Control) light traps installed at a height of 1.5 m inside human dwellings, in shelters for domestic animals in the peridomicile and on trails inside forests. The specimens collected were killed in chambers containing ethyl acetate, placed in polyethylene flasks and sent to the laboratory, where they were identified taxonomically using the method described by Ryan (1986) and Young & Duncan (1994).
Data analysis. To gain a better understanding of how the species were distributed, the municipalities were grouped according to the phytogeographic regions in which they are located. A group analysis was then carried out and a cladogram was obtained based on the Jaccard index, which takes into account the presence or absence of species.
A total of 91 phlebotomine species were found, of which four belonged to genus Brumptomyia and 87 to genus Lutzomyia, distributed among the following subgenera and groups: Evandromyia (6), Lutzomyia (5), Micropygomyia (2), Nyssomyia (9), Pintomyia (2), Pressatia (3), Psathyromyia (6), Psychodopygus (14), Sciopemyia (4), Trichophoromyia (2), Viannamyia (2); groups of species: Aragaoi (2), Baityi (1), Dreisbachi (1), Migonei (12), Oswaldoi (8), Pilosa (1), Saulensis (2), Verrucarum (4) and one that does not belong to any group (1).
1. B. avellari (Costa Lima, 1932)
2. B. brumpti (Larrousse, 1920)
3. B. pintoi (Costa Lima, 1932)
4. B. travassosi (Mangabeira, 1942)
5. L. bourrouli (Barretto & Coutinho, 1941)
6. L. brachyphalla (Mangabeira, 1941)
7. L. infraspinosa (Mangabeira, 1941)
8. L. monstruosa (Floch & Abonnenc, 1944)
9. L. pinottii (Damasceno & Arouck, 1956)
10. L. teratodes (Martins, Falcão & Silva, 1964)
11. L. carvalhoi (Damasceno, Causey & Arouck, 1945)
12. L. dispar (Martins & Silva, 1963)
13. L. gomezi (Nitzulescu, 1931)
14. L. longipalpis (Lutz & Neiva, 1912)
15. L. spatotrichia (Martins, Falcão & Silva, 1963)
16. L. micropyga (Mangabeira, 1942)
17. L. oliveirai (Martins, Silva & Falcão, 1970)
18. L. anduzei (Rozeboom, 1942)
19. L. antunesi (Coutinho, 1939)
20. L. flaviscutellata (Mangabeira, 1942)
21. L. inornata (Martins, Falcão & Silva, 1965)
22. L. intermedia (Lutz & Neiva, 1912)
23. L. olmeca nociva (Young & Arias, 1982)
24. L. richardwardi (Ready & Fraiha, 1981)
25. L. umbratilis (Ward & Fraiha, 1977)
26. L. whitmani (Antunes & Coutinho, 1939)
27. L. christenseni (Young & Duncan, 1994)
28. L. damascenoi (Mangabeira, 1941)
29. L. choti (Floch & Abonnenc, 1941)
30. L. triacantha (Mangabeira, 1942)
31. L. trispinosa (Mangabeira, 1942)
32. L. dendrophyla (Mangabeira, 1942)
33. L. abonnenci (Floch & Chassignet, 1947)
34. L. lutziana (Costa Lima, 1932)
35. L. punctigeniculata (Floch & Abonnenc, 1944)
36. L. scaffi (Damasceno & Arouck, 1956)
37. L. shannoni (Dyar, 1929)
38. L. amazonensis (Root, 1934)
39. L. arthuri (Fonseca, 1936)
40. L. ayrozai (Barretto & Coutinho, 1940)
41. L. carrerai carrerai (Barretto, 1946)
42. L. claustrei (Abonnenc, Léger & Fauran, 1979)
43. L. complexa (Mangabeira, 1941)
44. L. corossoniensis (Le Pont & Pajot, 1978)
45. L. davisi (Root, 1934)
46. L. geniculata (Mangabeira, 1941)
47. L. hirsuta hirsuta (Mangabeira, 1942)
48. L. lloydi (Antunes, 1937)
49. L. paraensis (Costa Lima, 1941)
50. L. squamiventris (Lutz & Neiva, 1912)
51. L. wellcomei (Fraiha, Shaw & Lainson, 1971)
52. L. fluviatilis (Floch & Abonnenc, 1944)
53. L. microps (Mangabeira, 1942a)
54. L. servulolimai (Damasceno & Causey, 1945)
55. L. sordellii (Shannon & Del Ponte, 1927)
56. L. ubiquitalis (Mangabeira, 1942a)
57. L. viannamartinsi (Sherlock & Guitton, 1970)
58. L. furcata (Mangabeira, 1941)
59. L. tuberculata (Mangabeira, 1941)
60. L. aragaoi (Costa Lima, 1932)
61. L. brasiliensis (Costa Lima, 1932)
62. L. baityi (Damasceno, Causey & Arouck, 1945)
63. L. hermanlenti (Martins, Silva & Falcão, 1970)
64. L. bacula (Martins, Falcão & Silva, 1965)
65. L. carmelinoi (Ryan, Fraiha, Lainson & Shaw, 1986)
66. L. cortelezzii (Brèthes, 1923)
67. L. corumbaensis (Galati, Nunes, Oshiro & Rego, 1989)
68. L. edwardsi (Mangabeira, 1941a)
69. L. evandroi (Costa Lima & Antunes, 1936)
70. L. lenti (Mangabeira, Mangabeira, 1938)
71. L. migonei (França, 1920)
72. L. pacae (Floch & Abonnenc, 1943)
73. L. sallesi (Galvão & Coutinho, 1939)
74. L. termitophila (Martins, Falcão & Silva, 1964)
75. L. walkeri (Newstead, 1914)
76. L. longipennis (Barretto, 1946)
77. L. goiana (Martins, Falcão & Silva, 1962)
78. L. oswaldoi (Mangabeira, 1942)
79. L. peresi (Mangabeira, 1942)
80. L. pusilla (Dias, Martins, Falcão & Silva, 1986)
81. L. quinquefer (Dyar, 1929)
82. L. rorotaensis (Floch & Abonnenc, 1944)
83. L. trinidadensis (Newstead, 1922)
84. L. pilosa (Damasceno & Causey, 1944)
85. L. saulensis (Floch & Abonnenc, 1944)
86. L. wilsoni (Damasceno & Causey, 1945)
87. L. odax (Fairchild & Hertig, 1961b)
88. L. orestes (Fairchild & Trapido, 1950)
89. L. nevesi (Damasceno & Arouck, 1956)
90. L. serrana (Damasceno & Arouck, 1949)
91. L. samueli (Deane, 1955)
Table I shows the distribution of the species in the different phytogeographic regions of the state of Maranhão. Species richness was greatest in OESF (52 species), followed by OF (31), MC (23), OESF/B/C (20), OESF (18), RE (13), CC (11) and OESF/B (6).
Fifty-six species, or 61.5% of the phlebotomine fauna, were present in only one type of phytogeographic region (Fig. 2). In absolute numbers, OESF accounted for the largest number of exclusive species (24), followed by MC (18), OESF/B/C (8), OF (4), OESF (1) and CC (1). However, when expressed as a percentage of the number of species in a particular phytogeographic region, the number of exclusive species was highest in MC (78.3%), followed by OESF (46.2%), OESF/B/C (40%) and OF (12.9%).
When the species distribution is analyzed by phytogeographic region, it can be seen that those areas with forest cover (OESF, OESF, OESF/B, OESF/B/C and OF) accounted for 72 species (Fig. 3), or 79.1% of the phlebotomine fauna in Maranhão. The areas with cerrado (MC, CC and OESF/B/C) accounted for 45 species (49.5%), and those where there were coconut palm forests (OESF/B/C and OESF/B) accounted for a total of 21 species (23.1%) (Fig. 3).
Analysis of Figure 4 shows that the phlebotomine communities with the highest similarity index were those in RE and OESF (0.48), RE and OESF/B (0.46), CC and OESF/B (0.42), RE and CC (0.41) and OESF and OF (0.38). The fauna in OESF/B/C showed some similarity with that in FEPA (0.32), CC (0.30), RE (0.28) and OESF/B (0.25).
The most widely distributed species were L. longipalpis and L. whitmani, which were found in all eight phytogeographic regions (Tab. I). Notable among the other species were L. evandroi (found in seven regions), L. lenti, L. sordellii and L. termitophila (6), L. wellcomei (5), and B. avellari, L. goiana, L. longipennis and L. migonei (4); the remaining species were found in one to three regions.
The phlebotomine fauna in the state of Maranhão is very species rich and is to date only exceeded in number of species by that in the states of Pará (117 species) and Amazonas (110). This result supports the hypothesis that phlebotomines are indeed more diversified in the Amazon basin, where at least 166 species have been found to date (Aguiar & Medeiros 2003). Nevertheless, the variety of phlebotomine species found in Maranhão, encompassing a large number of subgenera and groups, reflects the climatic and phytogeographic complexity of the state, which is a consequence of its location between three Brazilian biomes: the Amazon Forest, Cerrado and Caatinga. As a result, the fauna in Maranhão consists of elements of fauna from the Amazon and Northeastern and Midwestern Brazil.
Phytogeography is an important factor in explaining the diversity of phlebotomines in the state of Maranhão. The greater species richness observed in the municipalities in areas with dense evergreen seasonal forest can be explained by the essentially Amazonian characteristics of the vegetation, namely, heavy rainfall and high temperatures and humidity. Approximately 43% of the species found in this phytogeographic region do not go beyond the Pindaré river. They are therefore not found outside the region where the climate is hot and humid and are thus absent in the other phytogeographic regions in central-eastern Maranhão, where the climate is semi-humid and semi-arid. Surveys of euglossine bee fauna showed a similar pattern (Rebêlo & Silva 1999; Silva & Rebêlo 1999). The fact that the second greatest species richness was observed in areas where there is ombrophilous forest was expected, given the similarities between this type of vegetation and dense evergreen seasonal forest, both in terms of their structure and climate.
In contrast, areas with open forest and mixed vegetation have a semi-humid climate in a transition zone where the climate is changing to a semi-arid one, so that the number of species adapted to the hot and humid Amazon climate that are found is limited. However, approximately 57% of the species found in the Amazon regions are also found in an area that extends beyond these regions through areas of open evergreen seasonal forest into areas of mixed vegetation with, therefore, a more xeric climate. Thus, the overlap between open evergreen seasonal forest and coconut palm forests and cerrado, and in turn the overlap of the latter with caatinga (IBGE 1984), forms a mosaic of vegetation that results in a mixture of species from the Amazon and Northeast that is only found in these areas.
The opposite is observed in the meridional cerrado, which, because it is a homogeneous phytogeographic region covering the whole central-southern region of Maranhão, contains phlebotomine fauna that is particular to the region. A good idea of the extent to which the fauna is particular to this area can be had from the fact that 87.5% of the fauna in the meridional cerrado has not yet been detected outside this region, even in the areas of mixed vegetation in the north, where the cerrado is mixed with open forest and caatinga and phlebotomines have been studied in greater depth (Rebêlo et al. 1999b; Martin & Rebêlo 2006). Indeed, these species are more common in areas to the south of Maranhão, including the neighboring state of Tocantins (Andrade Filho et al. 2001b), as well as Goiás, Distrito Federal (Carvalho et al. 1989), Mato Grosso (Azevedo et al. 2002, Missawa & Maciel 2007) and Mato Grosso do Sul (Galati et al. 2006), all of which are in the cerrado. As the areas of meridional cerrado are less well studied than the forest areas, particularly in the very south of the state, a greater effort to capture phlebotomines may result in an increase in the number of known species in this phytogeographic region.
Analyzing the composition and distribution of phlebotomine species from another perspective, it can be seen that the fauna in Maranhão has a greater degree of similarity to that in Amazonian states, as 80.2% of the species in Maranhão (73 species) are also found in the neighboring state of Pará (see Ryan 1986; Rebêlo & Oliveira-Pereira 2001; Aguiar & Medeiros 2003). A smaller percentage (42.9%) of species in Maranhão are also found in other states in Northeastern Brazil. Of these states, Bahia has the fauna with the greatest similarity to that in Maranhão - 30 (33%) species are found in both states (see Aguiar & Medeiros 2003) - possibly because it is one of the states in the region where more studies of phlebotomine fauna are carried out. Nonetheless, twelve species in Maranhão not yet found in Bahia can be found in the states of Piauí, Ceará and Pernambuco (see Andrade Filho et al. 2001a; Aguiar & Medeiros 2003; Silva & Vasconcelos 2005).
The study has also shown that the number of currently known phlebotomine species in Maranhão has increased by 56% since the last list published by Rebêlo et al. (1996).
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Received 21/05/2009; accepted 20/07/2010
Editor: Mário Antonio Navarro da Silva