Springtails (Collembola) associated with nests of fungus-growing ants (Formicidae: Myrmicinae: Attini) in southern Bahia, Brazil.
Springtails are common inhabitants of fungus-growing ant nests, and in some cases they can be considered to be pests of the fungal gardens maintained by the ants. Even the peculiar behavior known as "jigging", described as rhythmic rocking behavior displayed by Cyphomyrmex and Myrmicocrypta ants (Formicidae: Myrmicinae), has been attributed to driving away the collembolans from fungus gardens (Kweskin 2004). Nevertheless, until now only 3 species of collembolans have been reported to be associated with fungus-growing ants, all in the genera Atta and Acromyrmex (Formicidae: Myrmicinae): Cyphoderus inaequalis Folsom (Lepidocyrtidae: Cyphoderinae) with Acromyrmex octospinosus (Reich) (Weber 1958), Pseudosinella violenta (Folsom) (Lepidocyrtidae) with Atta texana (Buckley) (Waller & Moser 1990), and Seira edmanni (Stach) (Seiridae) with A. sexdens (L) (Eidmann 1937). The occurrence of springtails of the family Sminthuridae have been reported in laboratory colonies of Cyphomyrmex costatus Mann (Formicidae: Myrmiciane) (Kweskin 2004), but there are no records of this group of microarthropods in any other fungus-growing ant nests. Here we report information on springtails living in the nests of fungus-growing ants in different localities of southern Bahia, Brazil.
Materials and Methods
Entire nests of fungus-growing ants, including ants of the genera Apterostigma, Cyphomyrmex, Mycocepurus, Myrmicocrypta, Sericomyrmex, and Trachymyrmex (Formicidae: Myrmicinae) were collected in the localities of Ubata, Ubaitaba, Itajufpe, and Ilheus, in the south-east of the state of Bahia, Brazil, during different periods of 2012 and 2013, during the project "Biology of fungus-growing ants in Southern Bahia, Brazil: associated fauna and nesting strategy". They were obtained from cocoa plantations and areas of secondary growth of tropical rain forest. These nests were examined for associated fauna. Springtails were obtained directly using a paint brush or entomological forceps. The springtails were sorted and mounted in Hoyer's solution for identification. Table 1 shows the main characteristics of the nests examined.
A total of 74 nests of the different ant species were examined for associated fauna. Springtails were found in only 17 nests, which belonged to the ants Sericomyrmex saussurei Emery (Formicidae: Myrmicinae) (5 nests), S. bondari Borgmeier (Formicidae: Myrmicinae) (4 nests), S. parvulus Forel (Formicidae: Myrmicinae) 2 nests), Myrmicocrypta sp. (5 nests), and Trachymyrmex cornetzi (Forel) (Formicidae: Myrmicinae) (1 nest). No collembolans were found in the nests of Apterostigma, Cyphomyrmex and Mycocepurus. A total of 106 springtails representing 4 species were recorded, the most common being Cyphoderus agnotus Borner (Cyphoderidae: Cyphoderus) (Table 2).
Springtails were found in only 24% of the nests, and were associated with 3 genera of fungus-growing ants among the 6 we studied. Cyphoderus was present in all the ant species nests, confirming its panmyrmecophily (Wasmann 1894). Nevertheless, we found that C. agnotus was associated with S. bondari (Hymentopera: Formicidae), whereas C. similis was associated with T. cornetzi. Mucrosomia (Iso tomidae: Anurophorinae) was recorded for the first time in ant nests; until now this genus has been found in Brazil only by Mendonca and Queiroz (2013) in mountains of the southeast of the country, whereas the other 3 known species occur in Europe (Potapov 2001). The species Proisotoma minima (Collembola: Isotomidae) has been recorded once previously associated with Ponerinae (Hymenoptera: Formicidae) ant nests found in cacao pods (Castano-Meneses et al. 2014).
Within attine "agricultural systems," Myrmicocrypta display a "lower agriculture" system, whereas Trachymyrmex and Sericomyrmex show a "generalized higher agriculture" system (Mehdiabadi & Schultz 2010). All of these ants cultivate their symbiotic fungus with plant detritus, flower fragments, seeds, and arthropod feces as substrates, which are suitable for growth of the leucocoprineous fungi grown by the ants (Brandao & Mayhe-Nunes 2007; Mehdiabadi & Schultz 2010). These fungi are common decomposers of the leaf litter, and also are consumed by the Collembola (Vellinga 2004; Takahashi et al. 2005). The availability of this food source can explain the abundance of springtails such as Cyphoderus in the nests of these ants. Collembola were already recorded as commensals in nests of different fungus growing ants, but without discrimination of the host ant species (Mehdiabadi & Schultz 2010). This is the first record of springtails associated with known species of the genera Myrmicocrypta, Trachymyrmex and Sericomyrmex. The occurrence of collembolans in the nests of fungus-growing ants is possibly beneficial to the growth of the symbiotic fungus. It has been observed that grazing activity of collembolans is able to increase the growth and respiration rate of fungal hyphae (Hedlund et al. 1991), and for this reason, the host ants tolerate them in their nests.
The authors would like to thank the Programa de Apoyos para la Superacion del Personal Academico, DGAPA, UNAM that gave support to sabbatical leave to GCM and research visit of DZ. CNPq is acknowledged for the grant concession to CSFM and JHCD. We are deeply thankful to Jose Raimundo Maia Santos's support in the field work, and to Karina Alves (In Memoriam) and Evelyn Froes for ant nest collection and sorting of the associated fauna. Luis Parra (ENAP-UNAM) corrected the English composition of the final manuscript.
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Gabriela Castano-Meneses (1,2*), Jose G. Palacios-Vargas (2), Jacques H.C. Delabie (3,4), Douglas Zeppelini (5), and Clea S.F. Mariano (3,4)
(1) Ecologia de Artropodos en Ambientes Extremos, Unidad Multidisciplinaria de Docencia e Investigacion, Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Campus Juriquilla, Boulevard Juriquilla 3001, 76230, Queretaro, Mexico. E-mail: email@example.com (G. C. M.)
(2) Ecologia y Sistematica de Microartropodos, Departamento de Ecologia y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, 04510, Mexico, Distrito Federal, Mexico. E-mail: firstname.lastname@example.org (J. G. P. V.)
(3) Departamentos de Ciencias Biologicas e de Ciencias Agrarias e Ambientais, Universidade Estadual de Santa Cruz, 45650-000 Ilheus, Bahia, Brazil. E-mail: Jacques. email@example.com (J. H. C. D.)
(4) Laboratorio de Mirmecologia, Centro de Pesquisas do Cacau,, Caixa Postal 7, 45600-970, Itabuna, Bahia, Brazil. E-mail: firstname.lastname@example.org (C. S. F. M.)
(5) Universidade Estadual da Paraiba Campus V, Centro de Ciencias Biologicas e Socias Aplicadas, Depto. Biologia. Programa de Pos Graduacao en Ecologia e Conservacao. 58070-450, Joao Pessoa, Paraiba, Brazil. E-mail: email@example.com (D. Z.)
(*) Corresponding author; E-mail: firstname.lastname@example.org
Table 1. Collecting sites in the southeast of Bahia State, Brazil, 2012-2013. Geographical coordinates Locality (Latitude, Longitude) Aurelino Leal-Boa Vista Farm 14.3500[degrees]S, 39.4000[degrees]W Canavieiras 15.6500[degrees]S, 38.9500[degrees]W Ilheus-Cocoa Research 14.7500[degrees]S, 39.2162[degrees]W Center-Reserva Zoobotanica Itajuipe-Estacao Experimental 14.7000[degrees]S, 39.4830[degrees]W Santa Luzia 15.4000[degrees]S, 39.3330[degrees]W Ubaitaba-Fazenda Fortaleza 14.3000[degrees]S, 39.3160[degrees]W Ubata-Fazenda Providencia 14.1830[degrees]S, 39.5000[degrees]W Una-Estacao Experimental ESMAI 15.2660[degrees]S, 39.0660[degrees]W Locality Environment Nests Aurelino Leal-Boa Vista Farm Cacao field 5 Canavieiras Arboretum 3 Ilheus-Cocoa Research Arboretum 50 Center-Reserva Zoobotanica Cacao field Secondary growth forest Itajuipe-Estacao Experimental Cacao field 6 Santa Luzia Cacao field 2 Ubaitaba-Fazenda Fortaleza Cacao field 4 Ubata-Fazenda Providencia Cacao field 2 Una-Estacao Experimental ESMAI Cacao field 2 Table 2. Springtails associated with the nests of fungus-growing ants in south-eastern Bahia State, Brazil. Collembola Host ants Entomobryomorpha Lepidocyrtidae Cyphoderinae Cyphoderus agnotus Borner Myrmicocrypta sp. Sericomyrmex bondari Borgmeier Sericomyrmex parvulus Forel Sericomyrmex saussurei Emery Cyphoderus similis Folsom Myrmicocrypta sp. Sericomyrmex parvulus Forel Sericomyrmex saussurei Emery Trachymyrmex cornetzi (Forel) Isotomidae Proisotominae Proisotoma minima (Absolon) Sericomyrmex saussurei Emery Anurophorinae Mucrosomia sp. Sericomyrmex saussurei Emery
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|Author:||Castano-Meneses, Gabriela; Palacios-Vargas, Jose G.; Delabie, Jacques H.C.; Zeppelini, Douglas; Mari|
|Date:||Dec 1, 2017|
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