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Brazilian Journal of Botany

Print version ISSN 0100-8404On-line version ISSN 1806-9959

Rev. bras. Bot. vol.23 n.2 São Paulo June 2000

http://dx.doi.org/10.1590/S0100-84042000000200011 

Pollination and other biotic interactions in figs of Ficus eximia Schott (Moraceae)1

 

RODRIGO AUGUSTO SANTINELO PEREIRA2,4, JOÃO SEMIR2
and AYRES DE OLIVEIRA MENEZES JR.3

 

(received: November 5, 1998; accepted: March 9, 2000)

 

 

ABSTRACT - (Pollination and other biotic interactions in figs of Ficus eximia Schott (Moraceae)). During the period from 1992 to 1997, interactions of several organisms and Ficus eximia figs, a monoecious species, were studied in plants located in Campinas/SP and Londrina/PR (Brazil). Ficus eximia is pollinated by a single fig wasp species, Pegoscapus sp. (Hymenoptera: Agaonidae, Agaoninae), but also visited by other 14 non-pollinating wasps (Agaonidae, Eurytomidae, Torymidae). Mites (Tarsonemidae), nematodes (Diplogasteridae) and fungi which use the body of the pollinating fig wasp to disperse themselves were also observed.

RESUMO - (Polinização e outras interações bióticas em sicônios de Ficus eximia Schott (Moraceae)). Durante o período de 1992 a 1997, as interações de vários organismos e figos de Ficus eximia, uma espécie monóica, foram estudadas em plantas localizadas em Campinas/SP e Londrina/PR (Brasil). Ficus eximia é polinizada por uma única espécie de vespa de figo, Pegoscapus sp. (Hymenoptera: Agaonidae, Agaoninae), e associada a outras 14 espécies de vespas não-polinizadoras (Agaonidae, Eurytomidae, Torymidae). Ácaros (Tarsonemidae), nematóides (Diplogasteridae) e fungos, os quais utilizam o corpo da vespa polinizadora para se dispersarem, foram também observados.

Key words - Plant-animal interaction, mutualism, reproduction

 

 

Introduction

The genus Ficus is of great value for studies on ecological and evolutionary questions, due to its diversified system of biotic interactions with several groups of organisms (Compton et al. 1996). Species of Ficus are pollinated exclusively by females of species-specific small wasps (Hymenoptera: Agaonidae: Agaoninae) which depend on fig trees to deposit their eggs in ovaries of female flowers and to develop their offspring (Janzen 1979a, Wiebes 1979, Corner 1985, Murray 1985). Non-pollinating fig wasps (mainly belonging to subfamilies of Agaonidae other than Agaoninae, but also other families, sensu Boucek 1988) which gall female flowers or parasite galler larvae, and that show some host specificity, are also associated with Ficus inflorescences (Gordh 1975, Ramírez 1988, Boucek 1993, Bronstein 1991, 1992).

The Ficus inflorescence or syconium (hereafter referred as fig) is an urn-shaped receptacle with flowers on the inner surface and apically closed off by numerous bracts forming the ostiole (Crane 1986, Verkerke 1989). Thus, for pollination to take place, female pollinating wasps bearing pollen need to penetrate the ostiole, working as pollen vector. The fig is usually considered a “trap” to pollinating wasps (foundress), because after pollination and oviposition the foundress do not leave the fig and die inside it. However, Gibernau et al. (1996) reported, in three Ficus species, that some foundresses could leave the fig after pollination (re-emerge).

Galil (1977) divided the life cycles of the fig wasps and the fig into five well defined phases: pre-female phase, before female flowers are mature; female phase, when female flowers are receptive and pollinators enter the figs; interfloral phase, when wasp larvae and seeds are maturing; male phase, when anthers are mature and the wasp offspring emerge from their galls and female pollinating wasps collect the pollen before dispersing; post-floral phase, after fig wasps dispersion and when figs ripen, becoming attractive to dispersers.

Figs also support a fauna of insects other than wasps and a diverse group of organisms (Nadel et al. 1992, Compton 1993). This study describes the pollination and other biotic interactions that occur in figs of F. eximia growing naturally in two Brazilian localities.

 

Material and methods

Ficus eximia Schott (subgenus Urostigma, section Americana) belongs to the taxonomic F. citrifolia P. Miller-complex (C.C. Berg, personal communication). This taxon has received several names in different localities, such as F. guaranitica Chodat & Vischer in Brazil (Carauta 1989) and F. hemsleyana Standley in Costa Rica (W. Ramírez B., personal communication). DeWolf (1960) lists 29 synonyms of F. citrifolia, among them F. eximia.

Ficus eximia is a monoecious tree that normally grows as epiphytic on other trees or edifications, frequently developing on anthropized areas. Figs are borne in pairs in the leaf axils and when mature reach 2-2.5 cm in diameter (figure 1). Fig production on each tree (normally referred as “crop”) is generally highly synchronized, but fructification is asynchronic among different individuals (Pereira et al. 1995).

 

Figure 1. Branch of Ficus eximia with figs in the male phase (figs with 2-2.5 cm in diameter). Campinas/SP. Photo E.L. Borba.

 

Plants of F. eximia growing in surroundings and on the UNICAMP campus (Campinas State University; Campinas/SP; 22°54'S, 47°03'W) and on the UEL campus (Londrina State University; Londrina/PR; 23°18'S, 51°09'W) were studied from 1992 to 1997. The wasp fauna was observed on four crops (from three plants; approximately 50 figs per crop) in Campinas and eight crops (from eight plants; approximately 40 figs per crop) in Londrina. Figs were sampled at the male phase and were placed individually in plastic flasks so all insects could emerge. Flasks were frozen and the total number of wasps by species was counted. The number of foundress pollinating wasps was evaluated on 64 crops sampled during the interfloral phase at Londrina and two others at Campinas. In addition, figs of the same two crops at Campinas were monitored weekly on the tree and dissected in the lab to analyse the development of the figs and associated organisms (e.g. fig wasps, fungus, nematodes and mites).

Voucher materials of plants are deposited in the UNICAMP (UEC) and UEL (FUEL) herbaria. Voucher insects, mites and nematodes are in possession of the senior author.

 

Results and Discussion

Associated fig wasps - The pollinating species (Pegoscapus sp., possibly P. tonduzi (Grandi); W. Ramírez B., personal communication) and 14 non-pollinating species (table 1) were found in samples from Campinas and Londrina. Fig wasps associated with F. eximia belong to Agaonidae, Eurytomidae and Torymidae families (sensu Boucek 1988), and have different morphological, behavioural and biological adaptations to explore the figs (table 1). The wasp fauna associated to F. eximia may be considered intermediary in richness compared with those of African Ficus species, which range between 3 and 30 fig wasp species (Compton & Hawkins 1992, Compton & van-Noort 1992). However, the F. eximia fig wasp fauna was composed mainly of galler species (table 1), as found in fig wasp communities from the New and Old Worlds (Compton & Hawkins 1992, West et al. 1996). \

 

Table 1. Upper categories, number of species by genus and characteristics of fig wasps associated with Ficus eximia. Resource utilization was based on field and experimental observations in Campinas/SP and Londrina/PR, as well as from data in the literature (West et al. 1996).

 

All females of pollinating and non-pollinating fig wasps of F. eximia are winged and fly in search of new figs to colonize, while males of the pollinating and some non-pollinating (Idarnes, carme and flavicollis groups; and Heterandrium) species are wingless (table 1), restricting their activities into the fig. Pollinator males are weak-pigmented, have small compound eyes and long telescopic gasters used for mating with females while they are still in their galls. Wingless non-pollinator males are also weak-pigmented and some possess well-developed mandibles and aggressive behaviour during the mating phase, as referred in literature (Hamilton 1979, Murray 1987).

Pollinating wasps and pollination - Ficus eximia pollinators are attracted to figs when female flowers are receptive (female phase). Studies have demonstrated that pollinator attraction is mediated through volatile chemicals released from figs in the receptive phase (van-Noort et al. 1989, Ware et al. 1993, Hossaert-McKey et al. 1994, Ware & Compton 1994). The pollinator of F. eximia penetrates the ostiole crawling through the bracts, and its wings and parts of antennae usually break off during this process. On several occasions dead pollinators were observed among the ostiole bracts (figure 2) due probably to the closing bracts process (Janzen 1979a) or the re-emergence attempt from the fig (Gibernau et al. 1996). The majority (35.8%) of the figs were colonized by one foundress (figure 3), although supercolonization was common (20 foundress were found on one occasion).

 

Figure 2. Fig of Ficus eximia in the interfloral phase. Dead foundresses in the ostiole and in the cavity of a fig (arrows). Scale = 5 mm.

 

 

Figure 3. Distribution of number of foundresses in 66 Ficus eximia crops (two from Campinas/SP, n = 139 and 462 figs; and 64 from Londrina/PR, n = 50 figs each crop). The bars represent the standard deviation.

 

Once inside the fig, the foundress wasp walks around on the platform composed by the stigmas of flowers (synstigma), pollinates female flowers removing pollen from its thoracic pollen pockets and corbiculae, and lays eggs in some of these flowers. This process of active pollination, known as ethodynamic, occurs in pollinating species where specific pollen storing structure and behaviour patterns concerned with pollination are involved (Galil & Meiri 1981, Joseph 1984). In F. eximia, like in other species (Galil & Eisikowitch 1968, Janzen 1979b, Bronstein 1988a, Kathuria et al. 1995, Nefdt & Compton 1996), pollinator eggs are preferentially laied in ovaries close to the fig lumen, while achenes develop on those near the fig wall. The pollinating species was the only one that oviposited on female flowers inside the cavity of the fig. Inner oviposition is also carried out by some non-pollinating fig wasps species from Old World Ficus groups (Galil & Eisikowitch 1968, Compton 1993). After pollination and oviposition, the F. eximia foundress wasps do not leave the fig and die inside the syconium cavity (figure 2).

The development of fig wasp larvae and achenes takes place during some weeks (interfloral phase), and finishes when the anthers mature and the offspring of fig wasps emerge from their galls (male phase). A single adult wasp emerges from each galled ovary. Wingless males emerge first and use their long telescopic gasters to mate females when these are still in their galls. Then the mated female progeny emerge from their galls and actively collect pollen, storing it in their thoracic pollen pockets and corbiculae. At the same time, the male progeny chew a communal exit hole, whereby female wasps leave the fig. The F. eximia pollinating offspring is highly female biased, a fact that has been interpreted as an adaptation to reduce the local mate competition in the fig “microhabitat” (Hamilton 1967, 1979, Frank 1985, Herre 1985, 1987, Ramírez 1987).

After dispersal of female fig wasps, F. eximia figs ripen and become attractive to frugivorous birds and bats (post-floral phase), as do other Ficus species (Janzen 1978, Coates-Estrada & Estrada 1986, Lambert & Marshall 1991, Figueiredo et al. 1995). Adult female pollinators survived 1.4 days on average (n = 23 wasps) under lab conditions, with maximum limit of two days. These wasps did not feed on diluted sugar solution, which could suggest that adult pollinators do not feed. These observations of short longevity and no feeding are in line with data on other Ficus pollinators species (Kjellberg et al. 1988, Compton 1993, Figueiredo & Sazima 1997).

Non-pollinating wasps - Females of non-pollinating species arrive on F. eximia figs at the female phase, as do pollinators, or during the interfloral phase (data not shown). Although non-pollinators oviposite externally through the fig wall, they lay their eggs in ovaries close to the fig lumen (figure 4), which is possibly due to their long ovipositors. The preferential utilization of ovaries close to the fig lumen for both pollinators and non-pollinators has been interpreted as selection for oviposition site, which allows better larvae development. Galls developing near the lumen could be less space-stressed and/or a better access to females within these galls for mating, as suggested by Anstett et al. (1997). The use of the same pool of ovaries by pollinators and non-pollinators may be yet a reproductive strategy of the latter, since the fig tree could not develop a defence against a non-pollinating wasp without eliminating the pollinating larva (Bronstein 1991, West & Herre 1994).

 

Figure 4. Longitudinal section shown an Idarnes, carme group, with the ovipositor inserted in an ovary near the lumen of the fig (arrow) of Ficus eximia. Scale = 1 mm. Campinas/SP.

 

The oviposition of non-pollinating fig wasps on F. eximia prevented unpollinated figs from aborting (table 2), as observed in other studies (Galil & Eisikowitch 1971, Bronstein 1991, Compton & van-Noort 1992, Compton 1993, Cook & Power 1996, West et al. 1996).

 

Table 2. Number of unpollinated figs (without achenes and pollinator progeny) that reached full development and supported non-pollinator offspring, in crops of Ficus eximia sampled in Londrina/PR. N = number of figs sampled by crop.

 

Brown spots were produced on the external surface of figs where non-pollinating fig wasps inserted their ovipositors. The number of spots was positively correlated with the quantity of non-pollinators reared in the figs (r2 = 0.531; p < 0.001; n = 214 figs). Thus, the quantification of these spots may be used as an indirect measurement of the infestation level by non-pollinating fig wasps. On some occasions, remains of fig wasps ovipositors, probably predated during oviposition, were observed inserted in the figs (figure 5). Predation by ants is frequent when non-pollinating wasps fig arrive to oviposit (Bronstein 1988b, 1991, Compton & Robertson 1988, 1991).

 

Figure 5. Remains of ovipositors (arrows) inserted in a Ficus eximia fig. Scale = 1 mm. Campinas/SP.

 

Each non-pollinating wasp of F. eximia develops into a galled ovary, as do pollinators. Non-pollinators emerge from their galls somewhat before or simultaneously to the progeny of pollinator, and leave the fig through the exit hole chewed by the pollinator males. Wingless males of Idarnes (carme and flavicollis groups) emerged and were active for mating before emergence of pollinator males.

Females of non-pollinating fig wasp species of Aepocerus, Eurytoma, Heterandrium, Idarnes and Physothorax genus were kept alive for several days under lab conditions, and fed on diluted sugar solution. The use of sugar solution as nourishment increased experimentally the longevity of an Idarnes (carme group) species (data not shown). Some non-pollinating species naturally search for food sources when they are outside the figs (W. Ramírez B., personal communication). Thus, the capacity of feeding in nature could be a strategy of energy restoration that might increase the longevity of fig wasps and they ability to find figs in a suitable phase for colonization.

Other associated organisms - Organisms other than fig wasps were found associated with F. eximia figs. Curculionid (Coleoptera: Curculionidae) and a moth (Lepidoptera) were observed breeding in the figs in crops in Londrina. The larvae of these insects had consumed almost all contents of figs by the end of their cycles and negatively affected the development of fig wasps.

Nematodes, probably Parasitodiplagaster (Diplogasteridae), were found in association with pollinators and figs of F. eximia. Nematodes arrive within the female pollinators and reproduce in the fig lumen during the interfloral phase. A high number of nematode juveniles was observed at the beginning of the male phase. These juveniles infect the pollinator offspring as they emerge from their galls and are transported to other figs (Giblin-Davis et al. 1995). This interaction of nematodes with pollinating fig wasps and figs has been reported by many authors (Martin et al. 1973, Nadel et al. 1992, Vovlas et al. 1992, Herre 1993).

Mites (Tarsonemidae), foretic on female pollinators, were observed in crops in Campinas. Mites attach themselves to the lower part of the thorax of female pollinating wasps and as  pollinators penetrate the fig, they drop off and reproduce among the bracts of the ostiole. Then at the end of the male phase, when female fig wasps are leaving the fig through the exit hole, mites attach themselves to pollinators and are taken to other figs. Twenty two percent of the figs (n = 120) in a crop sampled in Campinas had mites in the ostiole. This association has already been reported in Brazil (Hamilton 1979) as well as in other localities (Lindquist 1986, Ochoa et al. 1991, Nadel et al. 1992, Compton 1993, Ho 1994).

Fungus mycelia were present in the lumen of 12% of sampled figs (n = 244) in a crop in Campinas. W. Ramírez B. (personal communication) also observed fungi in figs of F. eximia in Costa Rica. These fungi do not apparently cause lesions in F. eximia figs, as do Fusarium moniliforme vectored on the body of pollinator of the edible fig, F. carica (Michailides & Morgan 1994). However, more detailed studies will be necessary to evaluate whether the fungus observed in F. eximia has any effect on the fig - fig wasps interaction.

Ficus eximia shows a diversified assembly of interactions with several groups of organisms. High interaction diversity in syconia of Ficus appears to be more the rule than the exception in monoecious species, both in the Old and New World (Bronstein 1991, Nadel et al. 1992, Compton 1993). Thus, the present study is another indication of the large number of open lines of investigation concerning Ficus trees and their associates.

Interactions of Ficus and non-fig wasp organisms (e.g. fungi, mites and nematodes) certainly have important potential for (co)evolutionary approaches, as do comparative studies (Herre et al. 1996, Machado et al. 1996) of relationship of fig wasps and host species. Emphasis still needs to be placed on studies involving several interactions occurring together in a particular Ficus species, since this information is normally fragmentary in the literature. However, more detailed studies must be done to elucidate some points of biotic interactions and to consolidate patterns in F. eximia and other Ficus species.

 

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1. Financial support provided by CAPES.

2. Departamento de Botânica, Instituto de Biologia, Universidade Estadual de Campinas, Caixa Postal 6109, 13083-970 Campinas, SP, Brazil.

3. Departamento de Agronomia, Centro de Ciências Agrárias, Universidade Estadual de Londrina, Caixa Postal 6001, 86051-970 Londrina, PR, Brazil.

4. Corresponding author: rodrigo@obelix.unicamp.br

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