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Neotrop. entomol. vol.37 no.1 Londrina Jan./Feb. 2008
New host-plant records for neotropical agromyzids (Diptera: Agromyzidae) from Asteraceae flower heads
Novos registros de plantas hospedeiras para agromizídeos (Diptera: Agromyzidae) neotropicais endófagos de capítulos de Asteráceas
Marina R. BraunI, II; Mário Almeida-NetoI, II; Rafael D. LoyolaI, II; Angelo P. PradoIII; Thomas M. LewinsohnI
ILab. Interações Insetos-Plantas, Depto. Zoologia
IIPrograma de Pós-Graduação em Ecologia, IB
IIIDepto. Parasitologia. Univ. Estadual de Campinas - UNICAMP, C. postal 6109, 13083-970, Campinas, SP email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com
Agromyzidae is a large and cosmopolitan fly family with approximately 2,500 known species. Here we present 22 new records of agromyzid-host plant associations. Plants were sampled from 2002 to 2005 in São Paulo state, Brazil. A total of eight agromyzid species were reared from 18 Asteraceae host species. The genus Melanagromyza Hendel was the commonest. This is the first detailed study reporting associations between non-leafmining Agromyzidae and their host plants in Brazil.
Key words: Cerrado, endophagy, herbivory, insect-plant interaction, Melanagromyza
A família Agromyzidae contém aproximadamente 2.500 espécies fitófagas conhecidas. Aqui são apresentados 22 novos registros de associação entre agromizídeos e suas plantas hospedeiras. Foram realizadas coletas entre 2002 e 2005 em remanescentes de cerrado no estado de São Paulo. As oito espécies de agromizídeos registradas pertencem ao gênero Melanagromyza Hendel e foram coletadas em 18 espécies de Asteraceae. Este é o primeiro estudo detalhado sobre associações entre agromizídeos não-minadores e suas plantas hospedeiras no Brasil.
Palavras-chave: Cerrado, endofagia, interação inseto-planta, Melanagromyza
Agromyzidae is a large and worldwide fly family with approximately 2,500 known species (Spencer 1996). The agromyzid family is comprised exclusively by phytophagous flies whose larvae develop inside host-plant organs, as strictly endophagous herbivores (Spencer 1990). Agromyzids are frequently called "leaf miner flies" because circa 80% of known agromyzid species feed within the leaf lamina in their larval stage (Spencer 1990). Among non-leaf miners, larvae feed and develop in other plant organs, such as roots, stems, and flower heads (Spencer & Steyskal 1986); these other habits are likely to be under-represented because they are less conspicuous than mines.
Host plant records of agromyzids are well documented for plants of economic importance (Spencer 1973a, 1990) but far less known for non-commercial plants, especially in tropical countries. However, the latter can be natural repositories for both potential weed control and pest agromyzid species and for their natural enemies (Schuster et al. 1991). Moreover, every record of interaction between herbivores and their host plants (i.e., the diversity of interactions) is itself important in representing community biodiversity (Lewinsohn 1991, Lewinsohn et al. 2005). In addition to the information bias towards economically important plants, association records between Agromyzidae and their host plants are naturally most frequent for those species whose larvae leave external marks on the plant, such as mines (Chen et al. 2003, Andersen et al. 2004). Probably for this reason, host plant records of agromyzids in flower heads of Asteraceae are uncommon in the literature (but see Spencer 1973b, Lewinsohn 1991, Spencer et al. 1992). In fact, asteracean flower heads are food resources of a speciose fauna of endophagous insects (Zwölfer 1988, Gagné 1994, Almeida et al. 2005).
In North America, extensive compilations of agromyzid occurrences list 13 species associated with Asteraceae flower heads, all of them belonging to the genus Melanagromyza Hendel (Spencer 1969, Spencer & Stegmaier 1973, Spencer & Steyskal 1986). In the Neotropics, Lewinsohn (1991) found 14 agromyzid species feeding on flower heads in montane and coastal localities of southern Brazil. Eleven of these species belonged to the genus Melanagromyza and three to Liriomyza Mik., the latter being recorded for the first time feeding on New World Asteraceae flower heads.
Recently, Benavent-Corai et al. (2005) published a revision of the world Agromyzidae host-plant interactions. Following this revision, our paper presents six new host-genus records (Aspilia, Campuloclinium, Hoehnephytum, Trixis, Vernonanthura, Wulffia) which represent an important increase in the host-plant feeding knowledge for this insect family.
Here we present new records of associations with host plants (Asteraceae) for agromyzid species found in the Brazilian Cerrado. Plant-agromyzid associations were recorded in samples obtained from 2000 to 2005 in 12 counties in the state of São Paulo, Brazil (see Table 1). The sampled areas were located in different Cerrado physiognomies that vary from dense woodlands to open grassland formations (Eiten 1972). For further details on study sites see Almeida et al. (2005) and Fonseca et al. (2005).
In the laboratory, flower head samples from each local population were kept separated in plastic containers covered with a mesh lid. Samples were checked for the presence of emerged adult insects at least once per week. Each sample was followed for two months or until emergence rates became insignificant. We have no indication of diapause in tropical agromyzids. The insects were pinned, labeled and identified based on the available literature (e.g., Spencer 1990, Spencer et al. 1992) and by comparison with specimens deposited at the Museu de Zoologia da Universidade de São Paulo and borrowed from the Natural History Museum, London. Voucher specimens were deposited at Museu de História Natural da Universidade Estadual de Campinas (ZUEC).
A total of eight species of agromyzids were reared from samples of Cerrado plants in São Paulo. The genus Melanagromyza was the commonest (n = 691 specimens). In fact, this is considered the largest genus of Agromyzidae in the Neotropics, with more than 280 described species (Spencer & Stegmaier 1973) (Table 1).
Agromyzid species were reared from 18 Asteraceae species distributed in ten genera and five tribes (Table 1). We recorded 23 agromyzid-asteracean associations, of which 22 are totally new. To our knowledge, the only previously published association was that between Melanagromyza erechtitidis Spencer and Erechtites hieracifolius (L.) Raf. (Senecioneae), known from Spencer (1966). All other agromyzids were reared from plants species that, until now, had never been recorded as hosts for this insect family (see Table 1).
A large proportion of agromyzids tend to be associated with phylogenetically closely related plants (Spencer 1990). For instance, Melanagromyza bidentis Spencer was recorded by Spencer (1966, 1973) feeding on plants of the tribe Heliantheae, and here it was found in host plants of the Eupatorieae, which is considered a sister tribe of the former (Bremer 1994). However, we also recorded this species in host plants of the tribe Vernonieae, which is not phylogenetically close to the above mentioned tribes (Bremer 1994). M. bidentis may warrant further investigation on its taxonomic status.
For other Melanagromyza species (e.g., M. chaptaliae Spencer, M. erechtitidis, M. floris Spencer, M. minima Spencer, M. minimoides Spencer) the new records do not represent novel host tribes. Although a polyphagous feeding pattern has been found within this genus. Similar results were found for M. neotropica Spencer, whose new records point to a specialized feeding pattern.
To the best of our knowledge, this is the first paper reporting associations between non-leafmining Agromyzidae and their host plants in Brazil.
Marina R. Braun received a scholarship from FMB, Mário Almeida-Neto was supported by FAPESP (03/02548-1), Rafael D. Loyola was supported by CNPq (140267/2005-0), and Thomas M. Lewinsohn was funded by FAPESP (04/15482-1) and CNPq (306049/2004-0).
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Received 28/IX/06. Accepted 18/V/07.