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Pollen Food Sources of the Stingless Bees Trigona Apicalis Smith, 1857

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Pollen Food Sources of the Stingless Bees Trigona Apicalis Smith, 1857 The Natural History Journal of Chulalongkorn University 6(2): 75-82, October 2006 ©2006 by Chulalongkorn University Pollen Food Sources of the Stingless Bees Trigona apicalis Smith, 1857, Trigona collina Smith, 1857 and Trigona fimbriata Smith, 1857 (Apidae, Meliponinae) in Thailand TOUCHKANIN JONGJITVIMOL* AND WANDEE WATTANACHAIYINGCHAROEN Department of Biology, Faculty of Science, Naresuan University, Phitsanulok, 65000 Thailand ABSTRACT.– The pollen collected by three species of Trigona; T. apicalis Smith 1857, T. collina Smith, 1857 and T. fimbriata Smith, 1857 were studied at the Phitsanulok Wildlife Conservation Development and Extension Station in Thailand, from January to December 2004. Pollen loads were sampled from bee baskets of forager bees returning to their colonies. We created a pollen key for the variety of local plant species. Pollen samples were prepared for analysis by acetolysis. Having developed the key, we determined the origin of pollen loads carried by returning foragers. In total, 2,160 pollen loads from bee baskets of forager bees were identified into 29 plant species of 18 families; Acathaceae (Ruellia tuberose), Agavaceae (Agave angustifolia), Alangiaceae (Alangium salviifolium), Arecaceae (Caryota bacsonensis), Asteraceae (Tridax procumbens), Bignoniaceae (Rernandoa adenophylla), Caesalpiniaceae (Cassia bakeriana, Delonix regia and Senna siamea), Convolvulaceae (Ipomoea aquatica and Merremia vitifolia), Cucurbitaceae (Coccinia grandis), Euphorbiaceae (Croton roxburghii), Lythraceae (Lagerstroemia calyculata, L. macrocarpa and L. tomentosa), Mimosaceae (Mimosa pigra and M. pudica), Papilionaceae (Butea monosperma, Dalbergia lanceolaria, Erythrina stricta and Millettia brandisiana), Rubiaceae (Ixora grandifolia and Paederia linearis), Scrophulariceae (Torenia fournieri), Thunbergiaceae (Thunbergia laurifolia), Verbenaceae (Tectona grandis) and Zingiberaceae (Costus speciosus and Zingiber officinale). T. collina was by far the most polylectic species collecting 29 plant species, while T. apicalis foraged on 20 and T. fimbriata only 16. This suggests that the small T. collina is the most important pollinator among the three species. KEY WORDS: pollen, stingless bees, Trigona apicalis, T. collina, T. fimbriata (Buchmann and Nabhan, 1996). The vast INTRODUCTION majority of the 300,000 known species of plants are specialized for pollination by insects. Insect Pollen is the male reproductive part of pollination of plants has evolved along with the plants. It is transported by wind, animals and insect itself, so plant and insects are mutually insects to the receptive female part or stigma dependent. For stingless bees, pollen is the main source of protein, lipids, vitamins, *Corresponding author: minerals and some carbohydrate (Grogan and E-mail: [email protected] 76 NAT. HIST. J. CHULALONGKORN UNIV. 6(2), OCTOBER 2006 Hunt, 1979; Wahurst and Goebel, 1995; onto aluminum stubs with double sided Buchmann and Nabhan, 1996; O’Toole and cellophane tape, and air-dried at room Raw, 1999). Most bees feed their larvae with temperature. Specimens were coated with gold, pollen, and adult bees nourish themselves on determined by a Leo 1455VP scanning electron pollen and nectar mixtures. This source of microscopy; SEM and photographed. proteinaceous nourishment for adult bees has been hypothesized to be fundamental to the many evolutions of social behavior in Apoidea RESULTS (Hunt, 1982). The collection of pollen by bees also provides valuable pollination services for From this study, we found 29 plant species many plants, including economically valuable of 18 families and 23 genera of plant species crops, ornamentals, and native plant species collected by three species of the stingless bees; (Buchmann and Nabhan 1996). This study T. apicalis, T. collina and T. fimbriata (Table observed species of pollen collected as food 1). Figure 1 is the example of pollen collected sources by three species of the stingless bees; by three Trigona species. T. apicalis Smith 1857, T. collina Smith, 1857 Trigona collina was observed, from pollen and T. fimbriata Smith, 1857. These three analysis, to be able to collect from 29 plant species are common in tropical forests and are species. This is the highest number of plant one of the important pollinators of wild plants species collected among the three species of in Thailand. stingless bees. T. apicalis is the second largest collector of pollen -20 species of plant. The last one, T. fimbriata was found to collect only 16 MATERIALS AND METHODS plant species. The percentage of pollen from each plant collected by individual species at the We studied the pollen loads collected by same time of every month shows in appendixes three species of Trigona; T. apicalis, T. collina 1-3. and T. fimbriata at the Phitsanulok Wildlife Conservation Development and Extension Station, Thailand during January to December CONCLUSION AND DISCUSSION 2004. In total, 20 returning pollen foragers from each colony of all species were captured A total of 2,160 pollen loads were collected at the nest entrances using a sweep net between by T. apicalis, T. collina and T. fimbriata at the 6.30 a.m. and 12.30 p.m. depending on Phitsanulok Wildlife Conservation Development weather conditions and foraging activity. and Extension Station in Thailand from January Repeated samples were taken on three to December 2004. Their pollen food sources consecutive days every month. We modified the were identified into 29 plant species of 18 pollen key by studying the local flora which families and 23 genera. Part of the differences flowered during 6.30 a.m. to 12.30 p.m. Pollen in pollen sources among the species may result was taken from flower buds (fresh material) and from 1) relationship between sizes and provided the key for pollen identification. structures of flowers and foragers, 2) foraging Pollen was prepared by the standard acetolysis times and 3) foraging preferences or floral method (Erdtman, 1960). They were mounted choice. in glycerin jelly for light microscopy (LM) From the pollen analysis, four plant species observation. Pollen measurements and of three families; T. procumbens (Asteraceae), morphological observations were analyzed by M. pigra and M. pudica (Mimosaceae) and T. an Olympus BX-41 microscope. For external grandis (Verbenaceae) are the main food morphological study, acetolysed pollen grains sources of T. apicalis. Five plant species of in 70% ethanol solution were pipetted directly four families; T. procumbens (Asteraceae), R. adenophylla (Bignoniaceae), M. pigra and M. JONGJITVIMOL AND WATTANACHAIYINGCHAROEN – STINGLESS BEE POLLEN FOOD SOURCES 77 TABLE 1. Pollen food sources were collected by three species of the stingless bees at Phitsanulok Wildlife Conservation Development and Extension Station, Thailand during January to December 2004. Families of Species of stingless bees Species of plants Local name of plants plants T. apicalis T. collina T. fimbriata Acathaceae Ruellia tuberose Toiting 3 3 3 Agavaceae Agave angustifolia Son narai 3 3 Alangiaceae Alangium salviifolium Pru 3 3 Arecaceae Caryota bacsonensis Taorang 3 Asteraceae Tridax procumbens Tin tukkae 3 3 3 Bignoniaceae Rernandoa adenophylla Kae hang khang 3 3 3 Caesalpiniaceae Cassia bakeriana Kanlanpa phruek 3 3 Senna siamea Khilek 3 3 3 Delonix regia Hang nokyaung 3 3 Convolvulaceae Merremia vitifolia Chingcho lueang 3 3 3 Ipomoea aquatica Phakbung 3 3 3 Cucurbitaceae Coccinia grandis Tamlueng 3 3 Euphorbiaceae Croton roxburghii Plaoyai 3 3 Lythraceae Lagerstroemia calyculata Tabaek 3 3 L. tomentosa Salao 3 3 L. macrocarpa Inthanin 3 3 Mimosaceae Mimosa pudica Maiyarap 3 3 3 M. pigra Maiyarap ton 3 3 3 Papilionaceae Dalbergia lanceolaria Chingchan 3 Butea monosperma Thongkwao 3 3 Erythrina stricta Thonglang 3 3 3 Millettia brandisiana Kraphi chan 3 3 Rubiaceae Ixora grandifolia Khem 3 3 Paederia linearis Totmu totma 3 3 Scrophulariceae Torenia fournieri Waeo mayura 3 3 Thunbergiaceae Thunbergia laurifolia Rangchute 3 3 Verbenaceae Tectona grandis Sak 3 3 Zingiberaceae Zingiber officinale Khing 3 3 Costus speciosus Ueang maina 3 3 Total: 18 families 29 species 20 species 29 species 16 species pudica (Mimosaceae) and T. grandis (Mimosaceae) are the main food sources for T. (Verbenaceae) are the main food sources of T. fimbriata. In this case, we found nine plant collina. Five plant species of two families; L. species; R. tuberose (Acathaceae), T. calyculata, L. macrocarpa and L. tomentosa procumbens (Asteraceae), R. adenophylla (Lythraceae) and M. pigra and M. pudica (Bignoniaceae), S. siamea (Caesalpiniaceae), I. 78 NAT. HIST. J. CHULALONGKORN UNIV. 6(2), OCTOBER 2006 FIGURE 1. Pollen (A: S. siamea, B: I. aquatica, C: T. laurifolia, D: A. angustifolia, E: D. regia, F: C. speciosus, G: L. calyculata and H: M. vitifolia) collected by three Trigona species. aquatica, M. vitifolia (Convolvulaceae), M. because all Trigona species can collect their pigra, M. pudica (Mimosaceae) and E. stricta pollens ,and two plant species; C. bacsonensis (Papilionaceae) are general food sources (Arecaceae) and D. lanceolaria (Papilionaceae) JONGJITVIMOL AND WATTANACHAIYINGCHAROEN – STINGLESS BEE POLLEN FOOD SOURCES 79 are specific food plants of T. collina because of ACKNOWLEDGEMENTS the bee’s body size related to the size and structure of the flowering plants more than This work was supported by the other species. The T. collina’s ability to collect TRF/BIOTEC Special Program for Biodiversity pollen from many plant species may be due to Research and Training
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