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Insect galls of the Reserva Biológica União, Rio de Janeiro, Brazil

Galhas de insetos da Reserva Biológica União, Rio de Janeiro, Brasil

Abstract:

Several inventories of insect galls have been performed in the Atlantic Forest of Rio de Janeiro, mostly in restingas, whereas the other phytophysiognomies remain poorly sampled. The present study inventoried the insect galls of Reserva Biológica União (RJ), a protected area comprising mainly Ombrophilous Forest. Field work was performed every two months from January to October, 2013. Insect galls were collected, photographed, characterized and transported to the laboratory. Adults were obtained by rearing and immature stages by gall dissection. The insects were deposited in the Cecidomyiidae Collection of the Museu Nacional. A total of 153 gall morphotypes were found on plants representing 37 plant families, 69 genera, 55 species and 53 morphospecies. Among them, two plant genera and five species were reported for the first time as host plants in Ombrophilous Forest. REBIO União showed little similarlity of host plant species and insect gall morphotypes when compared with other investigated Ombrophilous Forest areas. The leaf was the most attacked plant organ as expected. Asteraceae, Bignoniaceae, Fabaceae and Myrtaceae, and Mikania (Asteraceae) and Myrcia (Myrtaceae) were the richest host families and genera, respectivey, in number of gall morphotypes, all previously indicated as superhosts by other Brazilian Ombrophilous Forest inventories, except Bignoniaceae. Their great species richness may be related to their great gall richness, adding evidence in support of the taxon size hypothesis. Fusiform and globose galls were the most frequent, green was the predominant color, and most morphotypes did not present an indumentum. The highest gall richness was recorded in June and August. The gallers were distributed among Diptera (Cecidomyiidae), Lepidoptera, Hymenoptera, Hemiptera and Thysanoptera, with the first being predominant, following a global pattern. Eight gall-inducing species are recorded for the first time in REBIO União and four in Ombrophilous Forest. About 25% of the gall morphotypes were occupied by dwellers other than those that created the gall. They comprised parasitoids (Hymenoptera), inquilines (Diptera: Sciaridae and Muscomorpha, Hemiptera, and Lepidoptera) and successors (Psocoptera, mites, and Hymenoptera: Formicidae). Although these taxa were previously reported by Brazilian inventories of insect galls, 12 new association with plants are recorded. The amount of new records reinforces the importance of inventories.

Keywords:
Ombrophilous Forest; Atlantic Forest; insect-plant interaction; associated fauna

Resumo:

Vários inventários de galhas de insetos vem sendo desenvolvidos no estado do Rio de Janeiro, principalmente em restingas, enquanto as outras fitofisionomias permanecem pouco estudadas. O presente estudo inventariou as galhas de insetos da Reserva Biológica União (RJ), uma área protegida ocupada principalmente por Floresta Ombrófila. Trabalhos de campo foram realizados a cada dois meses de janeiro a outubro de 2013. Galhas de insetos foram coletadas, fotografadas, caracterizadas e transportadas para o laboratório. Adultos foram obtidos por criação e os imaturos pela dissecção das galhas. Os insetos foram depositados na Coleção de Cecidomyiidae do Museu Nacional (MMRJ). Um total de 153 morfotipos de galhas foram encontrados em plantas de 37 famílias, 69 gêneros, 55 espécies e 53 morfoespécies. Dentre estas, dois gêneros botânicos e cinco espécies foram registradas pela primeira vez como plantas hospedeiras em Floresta Ombrófila. A REBIO União mostrou uma pequena similaridade de plantas hospedeiras e morfotipos de galhas quando comparada com outras áreas de Floresta Ombrófila. As folhas foram o órgão vegetal mais atacado, como o esperado. Asteraceae, Bignoniaceae, Fabaceae e Myrtaceae, e Mikania (Asteraceae) e Myrcia (Myrtaceae) foram as famílias hospedeiras e gêneros botânicos mais ricos em número de morfotipos de galhas, todos previamente indicados como superhospedeiros em outros inventários na Floresta Ombrófila brasileira, exceto Bignoniaceae. A grande riqueza de espécies destes táxons pode estar relacionada a sua grande riqueza de galhas, adicionando evidências para a hipótese do tamanho do táxon. Galhas fusiformes e globoides foram as mais frequentes, a cor verde predominou e a maioria dos morfotipos não apresentou indumento. A maior riqueza de galhas ocorreu em junho e agosto. Diptera (Cecidomyiidae), Lepidoptera, Hymenoptera, Hemiptera e Thysanoptera foram as ordens indutoras encontradas, com predomínio dos Cecidomyiidae, seguindo o padrão mundial. Oito espécies galhadoras são registradas pela primeira vez na REBIO União e quatro em Floresta Ombrófila. Cerca de 25% dos morfotipos de galhas foram ocupados por outros artrópodes, que atuaram como parasitoides (Hymenoptera), inquilinos (Diptera: Sciaridae and Muscomorpha, Hemiptera, and Lepidoptera) e successores (Psocoptera, ácaros e Hymenoptera: Formicidae). Embora estes táxons já tivessem sido reportados em inventários de galhas de insetos do Brasil, 12 novas associações com plantas são registradas. A quantidade de novos registros reforça a importância dos inventários.

Palavras-chave:
Floresta Ombrófila; Mata Atlântica; interação inseto-planta; fauna associada

Introduction

Although several gall inventories have been developed in the state of Rio de Janeiro (RJ), Brazil, they have focused mainly on restinga ecosystems. Other physiognomies of the Atlantic Forest have been little investigated, including Dense Ombrophilous Forest, the focus of the present sudy. Dense Ombrophilous Forest is characterized by abundant phanerophytes, woody lianas and epiphytes, high rainfall distributed throughout the year and warm temperatures (annual mean of 25ºC) (Veloso et al. 1991VELOSO, H. P., RANGEL FILHO, A. L. R. & LIMA, J. C. A. 1991. Classificação da vegetação brasileira, adaptada a um sistema universal. IBGE, Departamento de Recursos Naturais e Estudos Ambientais, Rio de Janeiro). Due to the scarcity of studies, the insect galls of this physiognomy are poorly known.

Only two gall inventories have been developed in protected areas of Dense Ombrophilous Forest in Brazil, one in Santa Teresa, state of Espírito Santo (Maia et al. 2014MAIA, V. C. 2014. Insect galls of Itamonte (Minas Gerais, Brazil): characterization and occurrence. Biota Neotrop. 14:1-17.) and the other in the Parque Nacional do Itatiaia (PNI), Southeast Brazil (Maia & Mascarenhas 2017MAIA, V. C. & MASCARENHAS, B. 2017. Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil), An. Acad. Bras. Ciênc. 89:505-575). Other data can be found in various publications (Tavares 1915TAVARES, J. S. 1915. As cecídias das plantas do género Styrax no Brazil. Brotéria Sér. Zool. 13:145-160., 1916TAVARES, J. S. 1916. Cecidomyias novas do Brazil. Brotéria Sér. Zool. 14:36-57., 1917aTAVARES, J. S. 1917a. As cecídias do Brazil que se criam nas plantas da família das Melastomataceae. Brotéria Sér. Zool. 15:18-49., 1917bTAVARES, J. S. 1917b. Cecídias brazileiras que se criam em plantas das famílias das Compositae, Rubiaceae, Tiliaceae, Lythraceae e Artocarpaceae. Brotéria Sér. Zool. 15:113-181., 1918TAVARES, J. S. 1918. Cecidomyias novas do Brazil, segunda série. Brotéria Sér. Zool. 16:68-84., 1920aTAVARES, J. S. 1920a. O género Bruggmanniella Tav. com a descripção de uma Species nova e a clave dichotómica des géneros das Asphondyliariae. Brotéria Sér. Zool. 18:33-42., 1920bTAVARES, J. S. 1920b. [continuation of:] Cecidologia brazileira: cecídias que se criam em plantas das famílias das Leguminosae, Sapotaceae, Lauraceae, Myrtaceae, Punicaceae, Aurantiaceae, Malpighiaceae, Sapindaceae, Umbelliferae, Loranthaceae, Apocynaceae, Urticaceae, Salicaceae e Gramineae. Brotéria Sér. Zool. 18:97-125., 1922TAVARES, J. S. 1922. Cecidologia brazileira: as restantes famílias. Brotéria, Zool. 19:5-48., Kieffer 1913KIEFFER, J. J, 1913. Diptera. Family Cecidomyidae. In, Wytsman, P., ed., Genera Insectorum. Bruxelles. Fasc. 152-346, Gagné 1998GAGNÉ, R. J. 1998. In: GAGNÉ, R.J., FERRAZ, F. F. F. & MONTEIRO, R. E., A new species of Neolasioptera Felt (Diptera: Cecidomyiidae) on Cuphea carthagenensis (Jacq.) Macbride (Lythraceae) in Brazil, with notes on its biology. Proc. Entomol. Soc. Wash. 100:522-524., 2001GAGNÉ, R. J. 2001. In: GAGNÉ, R. J., ODA, R. A. M. & MONTEIRO, R. E. The gall midges (Diptera: Cecidomyiidae) of Mikania glomerata (Asteraceae) in Southeastern Brazil. Proc. Entomol. Soc. Wash. 103:110-134.). The main goal of this study was to provide a list of host plants, gall morphotypes and gallers of the Reserva Biológica União.

Material and Methods

Study site

This research was carried out in Reserva Biológica União (REBIO União), which has an area of about 2,500 hectares that encompasses parts of three municipalities in northern Rio de Janeiro State: Casimiro de Abreu, Macaé and Rio das Ostras (Figure 1). With about 250 tree species of 45 plant families, REBIO União hosts primary elements of the Atlantic Forest flora and fauna (MMA/ICMBio 2008aMMA/ICMBIO. 2008a. Plano de Manejo da Reserva Biológica União Encarte 2 - Análise da Região da Unidade de Conservação.). Among these, Myrtaceae, Lauraceae and Sapotaceae exhibit the greatest species richness (Rodrigues 2004RODRIGUES, P. J. F. P. 2004. A vegetação da Reserva Biológica União e os efeitos de borda na Mata Atlântica fragmentada. Centro de Biociências e Biotecnologia, Universidade Estadual do North Fluminense Darcy Ribeiro. ).

Figure 1
A) Map of Brazil, B) State of Rio de Janeiro and C) Reserva Biológica União. T1 - Buracão, T2 - Lavapé, T3 - Interpretativa, T4 - Três Pontes.

There are four official trails within REBIO União - Buracão, Interpretativa, Lavapé and Três Pontes - all of which were investigated during the present study. About 50% of Três Pontes and Lavapé trails are occupied by preserved forest, while the other two trails are more impacted, with the presence of roads, antropic fields, recuperating areas and exotic vegetation (MMA/ICMBio 2008bMMA/ICMBIO. 2008b. Plano de Manejo da Reserva Biológica União Encarte 3 - Análise da Unidade de Conservação, cMMA/ICMBIO. 2008c. Plano de Manejo da Reserva Biológica União Encarte 4 - Planejamento.).

Field work

Expeditions were undertaken every two months, from January to October, 2013, for a total of five. Each trail was investigated for insect galls for four hours by a single person per expedition, who obtained the geographic coordinates for each gall found using GPS.

Herbaceous, shrubby and arboreous plants were examined, the last up to 2 m high. Only aerial organs were investigated for galls. Branches (whenever possible with flowers and fruits) were removed from each host plant, labeled and pressed for preparation as exsiccates. The exsiccates were identified by Dr. Gracialda Costa Ferreira at Universidade Federal Rural da Amazonia, according to APGII, and deposited in the herbarium of the same institution. Galled branches were collected, packed and transported in labelled plastic bags. The galls were photographed and characterized according to their external morphology (shape, color, presence or absence of trichomes, and plant organ of occurrence).

Laboratory work

In the laboratory, samples of each gall morphotype were dissected to obtain the immature insects, observe the number of internal chambers and determine the food habit of the dwellers. They were classified into parasitoids (by observing parasitized galling larvae), inquilines (by observing different species cohabiting the same gall. In this case, early gall samples were examined to determine the galler) and successors (by observing dwellers in after dehiscent galls). To obtain adults, other samples were conditioned in labelled plastic pots lined with a layer of toilet paper. Each gall morphotype was kept in a separate pot to avoid mixing of the material. All pots were checked daily until newly emerged adults were encountered or the galls began to putrefy. When adults were found, the pots were placed in a refrigerator for some minutes to induced insect lethargy, at which time the adults were transferred to tubes with 70% ethanol. All insects were preserved in 70% ethanol and identified by the authors. Specimens of Cecidomyiidae were later mounted on microscope slides, following the methodology outlined in Gagné (1994)GAGNÉ, R. J. 1994. The Gall Midges of the Neotropical Region. Cornell University Press., Ithaca, xi + 356 p., 4 pls. , identified to genus, using the keys of Gagné (1994)GAGNÉ, R. J. 1994. The Gall Midges of the Neotropical Region. Cornell University Press., Ithaca, xi + 356 p., 4 pls. , and to species, based on gall morphology, host plant and original descriptions. Sciaridae (Diptera), Psocoptera and Hymenoptera were identified based on the keys of Steffan 1981STEFFAN, W. A. 1981. Sciaridae. Pp. 247-256. In: MCALPINE, J. F., PETERSON, G. E., SHEWELL, G. E, TESKEY, H. J., VOCKEROTH, J. R. & WOOD, D.M. (Eds.), Manual of Nearctic Diptera, Research Branch Agriculture Canada, Ottawa. , Aldrete and Mockford 2012ALDRETE, A. N .G. & MOCKFORD, E. L. 2012. Psocoptera. Pp.423-428. In: Rafael, J.A., Melo, G.A.R., Carvalho, C.J.B., Casari,S.A., Constantino, R. (Eds.), Insetos do Brasil: Diversidade e Taxonomia, Holos, Ribeirão Preto, Brasil. and Gibson et al. 1997GIBSON, G. A. P., HUBER, J. T. & WOOLLEY, J. B. 1997. Annotated Keys to the Genera o Nearctic Chalcidoidea (Hymenoptera). NRC Research Press, Ottawa., respectively. All insects were deposited in the Entomological Collection of Museu Nacional (MNRJ).

Botanical names and their respective authors, data on plant species distribution in Brazilian biomes, and origin (if exotic, native, or endemic) were obtained from Flora do Brasil 2018FLORA DO BRASIL. 2018. Flora do Brasil 2020 em construção. Jardim Botânico do Rio de Janeiro. Disponível em: <http://floradobrasil.jbrj.gov.br/>. Acesso em: 05 May 2018.
http://floradobrasil.jbrj.gov.br/...
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The geographic distribution of each gall morphotype in Brazil was updated based on the literature. New records of interactions between host plants and gallers were reported.

The similarity of gall composition among the investigated paths was measured using Sorensens´s index. We adopted this same index to evaluate the similarity among REBIO União and Santa Teresa and PNI, the two previous investigated areas of Dense Ombrophilous Forest in Brazil, using only the host plants which were identified to the species level.

Results

A total of 153 insect gall morphotypes (Figs. 2-6) were found in REBIO União on 108 plant species, 55 identified to the species level, 43 to genus and 10 to family, for an average of 1.42 gall morphotypes per plant species. The galled plants belonged to 37 families, of which Asteraceae, Bignoniaceae, Fabaceae, and Myrtaceae had the highest gall richness (the first three with 15 gall morphotypes each, followed by Myrtaceae with 13). Mikania Willd. (Asteraceae) and Myrcia DC. (Myrtaceae) were the genera with the greatest number of gall morphotypes (10 and 9, respectively) (Table 1).

Table 1
List of galled plants in the Reserva Biológica União (Rio de Janeiro, Brazil), their origin and number of gall morphotypes.

Figure 2
Insect galls of the Reserva Biológica União: A) On Acanthaceae, Dicliptera mucronifolia, stem gall, B-D) On Annonaceae, B) Xylopia sericea, marginal roll, C-D) Annonaceae (not determined), C) Leaf vein gall, D) Leaf gall, E-G) On Apocynaceae, E) Aspidosperma sp., stem gall, F) Mandevilla sp., stem gall, G) Apocynaceae (not determined), leaf gall, H-O) On Asteraceae, H) Mikania gleasonii, leaf vein gall, I-J) Mikania glomerata, I) Leaf vein gall, J) Leaf gall, K) Mikania pilosa, stem gall, L) Mikania sp.1, stem gall, M) Piptocarpha lundiana, stem gall, N) Vernonia sp., bud gall, O) Asteraceae (not determined), leaf vein gall, P-Z) On Bignoniaceae, P) Adenocalymma subsessilifolium, leaf vein gall, Q) Adenocalymma validum, stem gall, R) Amphilophium sp., leaf petiole gall, S) Anemopaegma chamberlaynii, leaf vein gall, T-U) Fridericia conjugata, T) Leaf gall, U) Leaf vein gall, V) Fridericia sp., leaf vein gall, W) Lundia sp., leaf vein gall, X) Mansoa angustidens, leaf gall, Y-Z) Mansoa sp., Y) Stem gall, Z) Leaf gall.

Figure 3
Insect galls of the Reserva Biológica União: A-B) On Bignoniaceae, Pyrostegia sp., A) Tendril gall, B) Stem gall, C-E) On Boraginaceae, C-D) Varronia curassavica, C) Leaf gall, D) Bud flower gall, E) Boraginaceae (not determined), bud gall, F) On Burseraceae, Protium sp., leaf gall, G) On Chrysobalanaceae, Licania sp., stem gall, H) On Combretaceae, Combretum sp., leaf gall, I-J) On Convolvulaceae, I) Ipomoea hederifolia, stem gall, J) Ipomoea sp., stem gall, K) On Dilleniaceae, Davilla sp., bud gall, L-N) On Erythroxylaceae, L-M) Erythroxylum macrophyllum, L) Leaf gall, M) Leaf vein gall, N) Erythroxylum sp., leaf gall, O-S) On Euphorbiaceae, O) Dodecastigma sp., leaf vein gall, P) Mabea piriri, stem gall, Q) Mabea speciosa, stem gall, R) Mabea sp., stem gall, S) Euphorbiaceae (not determined), stem gall, T-Z) On Fabaceae, T) Bowdichia sp., stem gall, U-V) Inga alba, U) Leaf gal, V) Stem gall, W-X) Inga capitata, W) Leaf gall, X) Stem gall, Y-Z) On Fabaceae, Y) Machaerium sp., leaf gall, Z) Martiodendron sp., stem gall.

Figure 4
Insect galls of the Reserva Biológica União: A-I) On Fabaceae, A) Myroxylon peruiferum, leaf gall, B-D) Parapiptadenia sp., B) Leaf gall, C) Bud gall, D) Stem gall, E) Pterocarpus sp., leaf gall, F) Senegalia serra, leaf petiole gall, G) Senna obtusifolia, leaf gall, H) On Lacistemataceae, Lacistema serrulatum, leaf gall, I-J) On Lamiaceae, Aegiphila integrifolia, I) Leaf gall, J) Leaf gall, K) On Lauraceae, Ocotea sp., leaf vein gall, L) On Lecythidaceae, Lecythis pisonis, leaf gall, M) On Loranthaceae (not determined), aerial root gall, N-P) On Malpighiaceae, N-O) Byrsonima sericea, N) Stem gall, O) Leaf gall, P) Stigmaphyllon sp., leaf vein gall, Q) On Malvaceae, Sida acuta, stem gall, R-U) On Melastomataceae, R) Miconia prasina, leaf gall, S-T) Miconia pusilliflora, S) Leaf gall, T) Leaf vein gall, U) Tibouchina estrellensis, leaf gall, V-Z) On Meliaceae, V-W) Guarea guidonia, V) Leaf gall, W) Leaf gall, X-Z) Guarea kunthiana, X) Leaf gall, Y) Leaf vein gall, Z) Leaf gall.

Figure 5
Insect galls of the Reserva Biológica União: A-J) On Myrtaceae, A) Eugenia florida, leaf gall, B-D) Myrcia splendens, B) Leaf vein gall, C) Bud gall, D) Leaf gall, E-G) Myrcia sp., E) Bud gall, F) Bud gall, G) Stem gall, H) Psidium guineense, stem gall, I) Psidium laruotteanum, stem gall, J) Myrtaceae (not determined), leaf gall, K-O) On Nyctaginaceae, K-L) Guapira opposita, K) Leaf gall, L) Leaf gall, M) Neea acuminata, stem gall, N-O) Neea sp., N) Stem gall, O) Leaf gall, P) On Olacaceae, Chaunochiton sp., stem gall, Q) On Onagraceae, Ludwigia sp., leaf vein gall, R-V) On Piperaceae, R) Piper aduncum, leaf vein gall, S) Piper tuberculatum, leaf gall, T-U) Piper vicosanum, T) Bud gall, U) Leaf gall, V) Piper sp., leaf gall, W-Z) On Rubiaceae, W) Borreria verticillata, stem gall, X) Diodia sp., stem gall, Y) Psychotria nuda, leaf gall, Z) Rubiaceae (not determined), flower bud gall.

Figure 6
Insect galls of the Reserva Biológica União, A) On  Salicaceae, Casearia arborea, stem gall, B-J) On Sapindaceae, Cupania racemosa, B) Leaf gall, C) Leaf vein gall, D) Matayba sp., stem gall, E-F) Paullinia glomerulosa, E) Stem gall, F) Leaf vein gall, G) Paullinia sp., leaf gall, H) Serjania lethalis, leaf gall, I-J) Serjania sp., I) Leaf vein gall, J) Leaf gall, K-M) On Siparunaceae, K-L) Siparuna guianensis, K) Leaf gall, L) Stem gall, M) Siparuna sp., leaf gall, N-R) On Solanaceae, N) Solanum campaniforme, leaf vein and petiole gall, O-Q) Solanum sp., O) Leaf and stem gall, P) Stem gall, Q) Leaf vein gall, R) Solanaceae (not determined), leaf vein gall, S) On Urticaceae, Pourouma sp., leaf vein gall, T) On Verbenaceae, Lantana camara, leaf gall.

Among the identified plant species, 51 were native - 16 of which were endemic - two naturalized, and one exotic; there were no data regarding origin for one of the identified species. The 153 gall morphospecies were distributed among 37 native genera and two endemic genera of plants. Native host plants (species and morphospecies) harbored 149 gall morphotypes, 27 of them on endemic plants, while exotic and naturalized species harbored one and three morphotypes, respectively. Twelve endemic species harbored a single gall morphotype, whereas Mikania pilosa Baker (Asteraceae), Piper vicosanum Yunck. (Piperaceae) and Cupania racemosa (Vell.) Radlk. (Sapindaceae) harbored two morphotypes, and Myrcia splendens (Sw.) DC. (Myrtaceae) three (Table 1).

Galls were found on both vegetative and reproductive plant organs (Table 2), and were most frequent on leaves (64.0%), followed by stems (30.7%), buds (9.1%), tendrils (1.3%), aerial roots (0.6%) and flower buds (0.6%). No galls were found on fruits. Nine gall morphotypes were observed on two or three plant organs simultaneously.

Table 2
Host plant species, gall-inducing insects, gall characterization, sampled localities and dates of collecting in Reserva Biológica União (state of Rio de Janeiro, Brazil). BU - Buracão, IN - Interpretativa, LV - Lavapé, TP - Três Pontes. New records in Brazil are indicated by numbers: 1. new record of host plant genus, 2. new record of host plant species, 3. new record of gall morphotype.

With regard to gall morphology, there was a predominance of globoid-shaped galls (49.0%), followed by fusiform (35.9%), lenticular (8.5%), marginal roll (4.6%), conical (3.9%), cylindrical (2.0%), imbricate (1.3%), toroid (1.3%), and amorphous (0.6%). Three morphotypes exhibited variation in shape, occuring as both globoid and fusiform. Green was the most frequent color (62.1%), followed by brown (34.0%), yellow (3.9%), red (1.3%), and purple (1.3%); greenish-yellow was also found (three morphotypes). A single morphotype exhibited color variation during development, changing from green to yellow. Additionally, all galls became brown when dried. Most of the galls were glabrous (81.7%), while trichomes were observed in just a few morphotypes (15.7%) (Table 2).

Concerning the trails, Três Pontes and Buracão had higher gall richness (65 and 56 morphotypes, respectively), while Lavapé and Interpretativa had lower (29 and 25, respectively). Thirty-eight morphotypes were observed exclusively along Três Pontes and 35 along Buracão, while the richness of exclusive morphotypes for the other two trails was considerably lower with 19 along Interpretativa and 18 along Lavapé. Sorensen’s index revealed little similarity among paths; Buracão and Três Pontes were the most similar (0.28), followed by Lavapé and Três Pontes (0.19), Buracão and Lavapé (0.12), and Interpretativa and Três Pontes (0.11), with Interpretativa and Lavapé, and Buracão and Interpretativa being the most different (0.03 and 0.02, respectively) (Table 2).

Most galls were recorded in June and August, while the other months (January, April and October), the gall richness was lower (Table 2).

Galls were induced by Diptera (Cecidomyiidae), Lepidoptera, Hymenoptera, Hemiptera and Thysanoptera, the first being the most frequent gallers (49.0%). The other taxa were responsible for a single gall morphotype each. As several galls were found empty, parasitized or occupied by more than one insect taxon, we could not determined the gallers responsible for 48.4% of the morphotypes (Table 2).

Seven species of Cecidomyiidae were identified among the gallers: Alycaulus globulusGagné, 2001GAGNÉ, R. J. 2001. In: GAGNÉ, R. J., ODA, R. A. M. & MONTEIRO, R. E. The gall midges (Diptera: Cecidomyiidae) of Mikania glomerata (Asteraceae) in Southeastern Brazil. Proc. Entomol. Soc. Wash. 103:110-134., Arrabiadaeamyia serrataMaia, 2001MAIA, V. C. 2001. The gall midges (Diptera, Cecidomiidae) from three restingas of Rio de Janeiro State, Brazil. Rev. Bras. Zool. 18:583-629., Asphondylia cfr. cordiae Möhn, 1959, Brugmannia robusta Maia and Couri, 1993, Cordiamyia globosa Maia, 1996, Dasineura byrsonimae Maia, 2010, Liodiplosis conica Gagné, 2001, and Schismatodiplosis lantanae Rübsaamen, 1908. Additionally, 11 cecidomyiid morphospecies were recorded distributed among seven genera: Asphondylia Loew, 1850, Bruggmannia Tavares, 1906, Bruggmanniella Tavares, 1909, Clinodiplosis Kieffer, 1894, Lopesia Rübsaamen, 1908, Neolasioptera Felt, 1908, and Zalepidota Rübsaamen, 1908. Among these genera, Asphondylia and Clinodiplosis were the most diversified, with nine and the five morphospecies, respectively, while the others were represented by a single morphospecies each.

Other gall dwellers were found in 39 morphotypes (25.5%) (Table 3). They comprised parasitoids, inquilines (phytophagous insects that occupy galls when they are still being used by gallers), and successors. The first were the most frequent dwellers being obtained from 29 gall morphotypes, and represented by seven families of Hymenoptera: Braconidae, Eulophidae, Eurytomidae, Ichneumonidae, Pteromalidae, Scelionidae, and Torymidae. Among these, the families Torymidae, Eurytomidae and Eulophidae predominated, being found in seven, seven and four gall morphotypes, respectively. The other families occurred in a single gall morphotype each. Four parasitoid genera were identified: Eurytoma Illiger, 1807 and Rileya Ashmead, 1888 (Eurytomidae), Horismenus Walker,1843 (Eulophidae), and Platygaster Latreille, 1809 (Platygastridae). The first two were associated with two galled plants each (Inga edulis and Varronia curassavica, and Guarea kunthiana and Piper vicosanum, respectively), whereas the other two genera had a single galled plant each. As inquilines we recorded Diptera (Sciaridae and Muscomorpha), Hemiptera and Lepidoptera in 13 gall morphotypes. Among these Hemiptera and Diptera were the most frequent, being observed in six and five plant species, respectively, followed by Lepidoptera obtained from three plant species. Two genera of Sciaridae were identified: Corynoptera Winnerty, 1867 and Pterothrix Mohrig, 2004. Sucessores included Psocoptera (Caeciliusidae), Formicidae and Acari (mites), obtained from four gall morphotypes. No predators were found.

Table 3
Host plant species, gallers, gall characterization and associated fauna in Reserva Biológica União (state of Rio de Janeiro, Brazil). 1. Parasitoid, 2.Inquiline, 3. Successor.

Discussion

One hundred and fifty-three gall morphotypes were found in REBIO União. Only two previous Brazilian inventories have been performed in areas of Ombrophilous Forest, the first in Santa Teresa, Espírito Santo (Maia et al. 2014MAIA, V. C. 2014. Insect galls of Itamonte (Minas Gerais, Brazil): characterization and occurrence. Biota Neotrop. 14:1-17.), and the second in Parque Nacional de Itatiaia (PNI), Southeast Brazil (Maia & Mascarenhas 2017MAIA, V. C. & MASCARENHAS, B. 2017. Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil), An. Acad. Bras. Ciênc. 89:505-575). The authors recorded 265 and 406 gall morphotypes in these areas, respectively. The average number of morphotypes per plant species was 1.42 in REBIO União, compared to 1.87 in Santa Teresa and 2.18 in PNI. Although the total number of gall morphotypes and the average number of morphotypes per plant were lower in REBIO União, it is important to emphasize that periodicity of field work and the size of the sampling area were very different among these sites. Parque Nacional do Itatiaia was investigated from February 2014 to December 2015 with a total of 13 trails in Ombrophilous Forest physiognomy, while Santa Teresa was investigated for two years - seasonally during the first year and monthly during the second year - and included surveys of three protected areas: Parque Natural Municipal São Lourenço (with a single trail), Estação Biológica de Santa Lúcia (with three trails), and Reserva Biológica Augusto Ruschi (single trail). Therefore, the sampling effort was higher in PNI and Santa Teresa than in REBIO União, which could have influenced the present results. The Sorensen´s index revealed little similarlity among these three areas both in terms of host plant species (REBIO União X PNI = 0.05; REBIO União X Santa Teresa = 0.04; PNI X Santa Teresa = 0.03) and insect gall morphotypes (REBIO União X Santa Teresa = 0.06; REBIO União X PNI = 0.05; PNI X Santa Teresa = 0.03). Since these areas exhibited few galled plant species in common, the same was expected with respect to gall morphotypes due the galler specificity.

The botanical families with the greatest gall richness in REBIO União were Asteraceae, Bignoniaceae, Fabaceae, and Myrtaceae. All have been previously indicated as superhosts by other Brazilian Ombrophilous Forest inventories except Bignoniaceae. Asteraceae, Fabaceae, and Myrtaceae are three of the ten most speciose families of the Atlantic Forest (Jardim Botânico do Rio de Janeiro 2016JARDIM BOTÂNICO DO RIO DE JANEIRO. 2016. Disponível em: <www.jbrj.gov/br/sites/all/themes/corporateclean/content/publicacoes/plantas_floresta_atlantica.pdf> Acesso em: 21.mar.2017.
www.jbrj.gov/br/sites/all/themes/corpora...
), adding evidence in support of the plant species richness hypothesis, which predicts a positive correlation between galling insect richness and plant taxon (families or genera) size (Fernandes 1992FERNANDES, G. W. 1992. Plant age and size effects on insular gall-forming species richness. Global Ecol. Biogeogr. 2:71-74.).

Mikania (Asteraceae) and Myrcia (Myrtaceae) were the plant genera with the greatest richness of galls in REBIO União. Both were previously highligthed as superhosts in Santa Teresa and PNI. The former contains 450 species (Holmes 1996HOLMES, W. C.,1996. A proposed sectional classification for Mikania (Eupatorieae). In, Hind D. J. N. (ed.) Compositae: Systematics. Royal Botanical Gardens, Kew. 621-626.), 171 of which are recorded for Brazil (King & Robinson 1987KING, R. M. & ROBINSON, H. 1987. The genera of the Eupatorieae (Asteraceae). Missouri Botanical Garden, St. Louis, 22:1-581.), while the latter contains 753 species (Govaerts et al. 2015GOVAERTS, R., SOBRAL, M., ASHTON, P., BARRIE, F., HOLST, B. K., LANDRUM, L. R., MATSUMOTO, K., MAZINE, F. F., LUGHADHA, E. N., PROENÇA, C., SOARES-SILVA, L.H., WILSON, P.G. & LUCAS, E. 2015. World Checklist of Myrtaceae. Facilitated by the Royal Botanic Gardens, Kew. Disponível em < http://www.kew.org/wcsp>. Acesso em: 27 Fev 2018.
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), with 282 recorded in Brazil (Flora do Brasil 2018FERNANDES, G. W. 1992. Plant age and size effects on insular gall-forming species richness. Global Ecol. Biogeogr. 2:71-74.). Their great species richness may be related to their great gall richness, again adding evidence in support of the taxon size hypothesis (Fernandes 1992FERNANDES, G. W. 1992. Plant age and size effects on insular gall-forming species richness. Global Ecol. Biogeogr. 2:71-74.).

Most host plant species were native, and together they hosted more than 90% of the gall morphotypes. We expect that the gallers that are associated with these plants are also native, based on high host specificity.

In concordance with other Brazilian inventories in areas of Ombrophilous Forest, leaves were the most galled plant organ in REBIO União, which can be explained by the fact that leaves represent an abundant and common resource (Maia 2001MAIA, V. C. 2001. The gall midges (Diptera, Cecidomiidae) from three restingas of Rio de Janeiro State, Brazil. Rev. Bras. Zool. 18:583-629.). There was a predominance of globoid and fusiform galls at REBIO União, as was the case for Santa Teresa and PNI. Furthermore, most leaf galls were globoid, whereas most stem and vein galls were fusiform. These shapes are also highligthed in other Atlantic Forest physiognomies, such as Restinga (Maia 2001MAIA, V. C. 2001. The gall midges (Diptera, Cecidomiidae) from three restingas of Rio de Janeiro State, Brazil. Rev. Bras. Zool. 18:583-629.) and Tableland Forest (Maia & Carvalho-Fernandes 2016MAIA, V. C. & CARVALHO-FERNANDES, S. P. 2016. Insect galls of a protected remnant of the Atlantic Forest tableland from Rio de Janeiro State (Brazil), Rev. Bras. Entomol. 60:40-56.). According to Isaias et al. (2013)ISAIAS, R. M. S., CARNEIRO, R. G. S., OLIVEIRA, D. C. & SANTOS, J. C. 2013. Illustrated and annotated checklist of Brazilian gall morphotypes. Neotrop. Entomol. 42:230-239., the high frequency of these shapes is related to the patterns of cell growth and differentiation of these plant organs. Most galls were glabrous, as in all other Brazilian inventories (Maia & Mascarenhas 2017MAIA, V. C. & MASCARENHAS, B. 2017. Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil), An. Acad. Bras. Ciênc. 89:505-575). According to Inbar et al. 2010INBAR, M., IZHAKI, I., KOPLOVICH, A., LUPO, I., SILANIKOVE, N., GLASSER, T., GERCHMAN, Y., PEREVOLOTSKY, A. & LEV-YADUN, S. 2010. Why do many galls have conspicuous colors? A new hypothesis. Arthropod-Plant Inte. 4:1-6., trichomes can act as structural defenses against loss of water or against predators and parasitoids, as they impair their feeding and mobility. As the REBIO União is a mesic environment, and the frequency of parasitism was low, the presence of trichomes appears to be unnecessary. Green and brown galls predominated, being the same colors of the most frequent galled plant organs, leaves and stems, respectively, whereas yellow, red and purple galls were rare. Inbar et al. 2010INBAR, M., IZHAKI, I., KOPLOVICH, A., LUPO, I., SILANIKOVE, N., GLASSER, T., GERCHMAN, Y., PEREVOLOTSKY, A. & LEV-YADUN, S. 2010. Why do many galls have conspicuous colors? A new hypothesis. Arthropod-Plant Inte. 4:1-6. proposed that galls that exhibit a combination of high levels of defensive compounds with conspicuousness - size, shape, bright coloration and possibly odor - are aposematic. Galls are manipulated by gallers to form all the components of aposematism (chemical defenses and warning coloration or odor). The components of the aposematic phenotype are expressed externally in the gall tissue, protecting the galling insects and not the host plant that produces them, as the hosts have no interest in protecting their parasites. Advertisement of chemically-defended galls may reduce predation by mammalian herbivores, avian insectivores and frugivores and various arthropods. In contrast, galls that exhibit the same color of the host organ are cryptic and probably poor in chemical defenses. Cryptic coloration can also protect the galler against predation. In REBIO União, 57 plant species have been recorded as food sources for the golden-lion tamarin (Leontopithecus rosalia Linnaeus, 1766). Four of these plant species are known to host galls - Inga edulis, Myrcia sp., Pourouma sp., and Simarouba amara (Lapenta 2002LAPENTA, M. J. 2002. O Mico-Leão-Dourado (Leontopithecus rosalia) como dispersor de sementes na Reserva Biológica União/Ibama, Rio das Ostras, RJ - São Paulo, p.120.) - all of which are cryptic, except for one morphotype on Myrcia sp., which is reddish. We observed color change in a single gall morphotype, which changed from green to yellow. According to Stone et al. 2002STONE, G. .N., SCHONROGGE, K., ATKINSON, R. J., BELLIDO, D. & PUJADE-VILLAR, J. 2002. The population biology of oak gall wasps (Hymenoptera: Cynipidae). Annu. Rev. Entomol. 47:633-668., some galls may change color during their development in association with exposure to light or plant defenses.

In the present study, the highest gall richness was recorded in June and August, the period when most plants are sprouting, which increases the availability of oviposition sites since new tissues have high differentiation capacity and plasticity (Gonçalves et al. 2005, Rohfritsch 1992ROHFRITSCH, O. 1992. Patterns in Gall Development. Pp. 210-220. In: SHORTHOUSE, J. D., & ROHFRISTSCH, O. (eds), Biology of insect-induced galls, Oxford University Press, New York. ).

We noticed that the longer trails had higher gall richness, while shorter trails had lower gall richness, indicating that the gall richness is positively related to trail length. This is probably a result of the longer paths encompassing a greater number of plant species and, consequently, a greater number of possible hosts. The Sorensen's index revealed little similarity among the studied trails, so each contributes to the gall richness of REBIO União.

We recorded gallers of five orders: Diptera (Cecidomyiidae), Lepidoptera, Hymenoptera, Hemiptera, and Thysanoptera. Thus, all galling insect orders were represented at REBIO União with the exception of Coleoptera. Maia et al. 2014MAIA, V. C. 2014. Insect galls of Itamonte (Minas Gerais, Brazil): characterization and occurrence. Biota Neotrop. 14:1-17. and Maia & Mascarenhas 2017MAIA, V. C. & MASCARENHAS, B. 2017. Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil), An. Acad. Bras. Ciênc. 89:505-575 found galls induced by other insect taxa in their inventories of Ombrophilous Forest, such as Tephritidae (Diptera) and Coleoptera. Cecidomyiidae were the most frequent gallers at REBIO União, following a global pattern. As several galls were found empty, parasitized or occupied by more than one insect taxon, we could not determined their gallers.

Among the gallers, Alycaulus globulusGagné, 2001GAGNÉ, R. J. 2001. In: GAGNÉ, R. J., ODA, R. A. M. & MONTEIRO, R. E. The gall midges (Diptera: Cecidomyiidae) of Mikania glomerata (Asteraceae) in Southeastern Brazil. Proc. Entomol. Soc. Wash. 103:110-134., Arrabiadaeamyia serrataMaia, 2001MAIA, V. C. 2001. The gall midges (Diptera, Cecidomiidae) from three restingas of Rio de Janeiro State, Brazil. Rev. Bras. Zool. 18:583-629., Asphondylia cfr. cordiae Möhn, 1959, Brugmannia robusta Maia and Couri, 1993, Cordiamyia globosa Maia, 1996, Dasineura byrsonimaeMaia, 2010MAIA, V. C. & OLIVEIRA, J. C. 2010. Galls de insetos da Reserva Biológica da Praia do South (Ilha Grande, Angra dos Reis, RJ). Biota Neotrop. 10:227-238., Liodiplosis conicaGagné, 2001GAGNÉ, R. J. 2001. In: GAGNÉ, R. J., ODA, R. A. M. & MONTEIRO, R. E. The gall midges (Diptera: Cecidomyiidae) of Mikania glomerata (Asteraceae) in Southeastern Brazil. Proc. Entomol. Soc. Wash. 103:110-134. and Schismatodiplosis lantanae Rübsaamen, 1908 were recorded for the first time in REBIO União, thus expanding their known distribution. Alycaulus globulus, Cordiamyia globosa, Liodiplosis conica and Schismatodiplosis lantanae had been previously recorded from Ombrophilous Forest (Gagné et al. 2001GAGNÉ, R. J. 2001. In: GAGNÉ, R. J., ODA, R. A. M. & MONTEIRO, R. E. The gall midges (Diptera: Cecidomyiidae) of Mikania glomerata (Asteraceae) in Southeastern Brazil. Proc. Entomol. Soc. Wash. 103:110-134., Maia et al. 2014MAIA, V. C. 2014. Insect galls of Itamonte (Minas Gerais, Brazil): characterization and occurrence. Biota Neotrop. 14:1-17., Maia & Mascarenhas 2017MAIA, V. C. & MASCARENHAS, B. 2017. Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil), An. Acad. Bras. Ciênc. 89:505-575, Proença & Maia 2014PROENÇA, B. & MAIA, V. C. 2014. New state record of Schismatodiplosis lantanae (Rübsaamen, 1908) (Insecta, Diptera, Cecidomyiidae) in Brazil. Check List 10:1557-1559.), while Asphondylia cfr. cordiae, Brugmannia robusta and Dasineura byrsonimae were previously recorded from Restinga and Tableland Forest (Maia & Silva 2016MAIA, V. C. & SILVA, L. O. 2016. Insect galls of Restinga de Marambaia (Barra de Guaratiba, Rio de Janeiro, RJ). Braz. J. Biol. 76:787-795. tp://dx.doi.org/10.1590/1519-6984.05314 http://www.biotaneotropica.org.br/v13n3/pt/abstract?inventory+bn02213032013
tp://dx.doi.org/10.1590/1519-6984.05314...
, Maia & Carvalho-Fernandes 2016MAIA, V. C. & CARVALHO-FERNANDES, S. P. 2016. Insect galls of a protected remnant of the Atlantic Forest tableland from Rio de Janeiro State (Brazil), Rev. Bras. Entomol. 60:40-56.), and Arrabiadaeamyia serrata from just Restinga. So, the last four species were recorded for the first time in Ombrophilous Forest.

At least seven genera of gall midges were recorded in REBIO União in the present study, with those of the genera Asphondylia and Neolasioptera being the most diverse. These genera have been recorded in other Brazilian inventories, in restingas of the states of Rio de Janeiro and São Paulo (Maia 2001MAIA, V. C. 2001. The gall midges (Diptera, Cecidomiidae) from three restingas of Rio de Janeiro State, Brazil. Rev. Bras. Zool. 18:583-629., Oliveira & Maia 2005OLIVEIRA, J. C. & MAIA, V. C. 2005. Ocorrência e caracterização de Galls de insetos na restinga de Grumari (Rio de Janeiro, RJ, Brazil). Arqu. Mus. Nac. 63:669-675., Maia & Oliveira 2010MAIA, V. C. & OLIVEIRA, J. C. 2010. Galls de insetos da Reserva Biológica da Praia do South (Ilha Grande, Angra dos Reis, RJ). Biota Neotrop. 10:227-238., Monteiro et al. 1994MONTEIRO, R. F.; FERRAZ, F. F. F.; MAIA, V. C. & AZEVEDO, M. A. P. 1994. Galhas entomógenas em restingas: uma abordagem preliminar. Pp. 210-220. In: WATANABE, S. (Ed.). Anais do III Simpósio de Ecossistemas da Costa Brazileira: subsídios a um gerenciamento ambiental ACIESP, vol. 3, São Paulo., 2004MONTEIRO, R. F., ODA, R. A. M., NARAHARA, K. L. & CONSTANTINO, P. A. L. 2004. Galls: Diversidade, Especificidade e Distribution. Pp. 127-141. In: ROCHA, C. F. D, ESTEVES, F. A., & SCARANO, F. R. (Eds.), Pesquisa de Longa Duração na Restinga de Jurubatiba: Ecologia, História Natural e Conservação, RiMa Editora, São Carlos., Maia et al. 2008MAIA, V. C., MAGENTA, M. A. G. & MARTINS, S. E. 2008. Ocorrência e caracterização de Galls de insetos em áreas de restinga de Bertioga (São Paulo, Brazil). Biota Neotrop. 8:167-197.), in Ombrophilous Forest in Southeast Brazil (Maia & Mascarenhas 2017MAIA, V. C. & MASCARENHAS, B. 2017. Insect Galls of the Parque Nacional do Itatiaia (Southeast Region, Brazil), An. Acad. Bras. Ciênc. 89:505-575) and in Cerrado in Minas Gerais (Maia & Fernandes 2004MAIA, V. C. & FERNANDES, G. W. 2004. Insect galls from Serra de São José (Tiradentes, MG, Brazil). Braz. J. Biol. 64:423-445.), which is evidence of their adaptability to different environmental conditions.

The present study provided new data on insect-plant interactions, including: Asphondylia on Mikania gleasonii (Asteraceae) and Pyrostegia (Bignoniaceae); Neolasioptera on Anemopaegma chamberlaynii, Lundia and Mansoa (Bignoniaceae); Bruggmanniella on Siparunaceae; Clinodiplosis on Davilla rugosa (Dilleniaceae) and Solanum campaniforme (Solanaceae); and Lopesia on Salicaceae. These new data reinforce the importance of inventories.

About 25% of the gall morphotypes were occupied by dwellers other than those that created the gall. This rate is similar to that recorded in PNI (27.5%), but lower than the rates recorded for areas of restinga (50% in Bertioga, in the state of São Paulo; 56% in Maricá + Carapebus in the state of Rio de Janeiro; 40% in Mangaratiba also in the state of Rio de Janeiro). This finding is probably due to the harsh abiotic conditions of restingas, which include intense lumination and strong winds, which could favor gall formation and occupation as a protective strategy.

Parasitoids, being represented by seven families of Hymenoptera, were more frequent and diverse than inquilines and successors. Parasitoids were also reported in all other Brazilian inventories of insect galls as predominant. They are considered the main natural enemies of galling insects, and play an importan role in their populational control (La Salle 1993LA SALLE, J. 1993. Aprostocetus (Ootetrastichus) theioneurus (Masi): a hyperparasitoid of the cereal stem-borer Chilo partellus in Africa (Hymenoptera: Eulophidae; Lepidoptera: Pyralidae). Zool. Med. Leiden 67:445-451.). These families of Hymenoptera have all previously been reported by Brazilian inventories of insect galls, among which Torymidae, Eurytomidae and Eulophidae are the most frequent families (Maia & Azevedo 2009MAIA , V. C. & AZEVEDO, M. A. P. 2009. Micro-himenópteros associados com galhas de Cecidomyiidae (Diptera) em Restingas do Estado do Rio de Janeiro (Brasil). Biota Neotrop. 9: 151-164.).

Inquilines included Diptera (Sciaridae and Muscomorpha), Hemiptera and Lepidoptera, all of which have aready been recorded in other Brazilian inventories. Nevertheless, few records of inquilinous Sciaridae and Muscomorpha are known (Maia & Fernandes 2004MAIA, V. C. & FERNANDES, G. W. 2004. Insect galls from Serra de São José (Tiradentes, MG, Brazil). Braz. J. Biol. 64:423-445., Maia et al. 2008MAIA, V. C., MAGENTA, M. A. G. & MARTINS, S. E. 2008. Ocorrência e caracterização de Galls de insetos em áreas de restinga de Bertioga (São Paulo, Brazil). Biota Neotrop. 8:167-197., Maia et al. 2014MAIA, V. C. 2014. Insect galls of Itamonte (Minas Gerais, Brazil): characterization and occurrence. Biota Neotrop. 14:1-17., Rodrigues et al. 2014RODRIGUES, A. R., MAIA, V. C. & COURI, M. S. 2014. Insect galls of restinga areas of Ilha da Marambaia, Rio de Janeiro, Brazil. Rev. Bras. Entomol. 58:173-197.). Among Sciaridae, we identified two genera, Corynoptera Winnerty, 1867 and Pterothrix Mohrig, 2004, both reported for the first time as gall inquilines. The records of Sciaridae on Martiodendron sp. (Fabaceae), Psidium guianeense (Myrtaceae) and Lantana camara (Verbenaceae) are also new. Muscomorpha were reported for the first time on Varronia curassavica (Boraginaceae). Hemiptera and Lepidoptera are frequent inquilines, having been associated with several plants in Brazil, but the records of Hemiptera on Dodecastigma (Euphorbiaceae), Aegiphila integrifolia (Lamiaceae), Myrcia splendens (Myrtaceae), Cupania racemosa (Rubiaceae), Solanum campaniforme (Solanaceae), and Lantana camara (Verbenaceae) are new, as well as the record of Lepidoptera on Piper vicosanum (Piperaceae).

Successors were represented by Psocoptera, Hymenoptera (Formicidae) and Acari, all previously recorded in galls. Nevertheless, new associations were observed, namely: Caeciliusidae (Psocoptera) on Varronia curassavica (Boraginaceae) and Ocotea sp. (Lauraceae); Formicidae (Hymenoptera) on Myrcia splendens (Myrtaceae); and Acari on Solanum campaniforme (Solanaceae).

Comparing the galled plants of the REBIO União with those of other Brazilian inventories in the Atlantic Forest, we verified that two genera (Xylopia L. and Thunbergia L.), and five species (Dicliptera mucronifolia, Thunbergia alata, Mikania pilosa, Adenocalymma subsessilifolium DC., and Adenocalymma validum) were reported for the first time as host plants.

Conclusions

The REBIO União hosts particular insect gall richness with several galls on endemic plants, which showed the importance of this protected area for the conservation of the galling guild. Asteraceae, Fabaceae and Myrtaceae were confirmed as plant families with the greatest gall richness in Ombrophilous Forest areas, while Bignoniaceae was added as a super host. The predominant features of galls of REBIO União were in agreement with the morphological pattern previously observed in Brazil. The geographical distribution of eight gall midge species were expanded and new data on insect-plant interactions were provided. The new records reinforce the importance of such inventories for improving the knowledge of galling guild richness and distribution in Brazil.

Acknowledgments

The authors are grateful to Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) (EDITAL 12/2012 Biota), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (VCM - Proc 301481/2017-2), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (ESS - Master scholarship) and for financial support.

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Publication Dates

  • Publication in this collection
    13 Dec 2019
  • Date of issue
    2020

History

  • Received
    15 Mar 2019
  • Reviewed
    16 Aug 2019
  • Accepted
    24 Oct 2019
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