floral display, inflorescence mechanisms, Pantanal, pollinator behavior, reproduction


Thalia geniculata L. (Zingiberales, Marantaceae) has inflorescences with two simultaneously opening, hermaphroditic, single-day flowers, which form a pseudanthium. The species has an irreversibly explosive pollination mechanism. In one population of T. geniculata we verified that in 98.5% of the pseudanthia, only one flower from each pair set fruit. We assessed whether this fruit-set pattern could be linked to pollinator behavior, testing if pollinators only visit one flower in each pseudanthium, which would decrease visitation probability of the other flower in the pseudanthium. In the morning, less flowers were visited than in the afternoon, and we observed higher pollinator activity in the afternoon. In the morning, most of the visited pseudanthia had only one flower visited, while in the afternoon most pseudanthia had both flowers visited, the opposite of what we predicted. We concluded that single fruit set in the pseudanthia is not caused by pollinator behavior. It might be caused by pollen limitation during pollinator visits or even  resource limitation to support two fruits per pseudanthia.

Author Biographies

Pamela Cristina Santana, Universidade de São Paulo

Instituto de Biociências

Departamento de Ecologia

André Rodrigo Rech, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Departamento de Educação no Campo

Faculdade Interdisciplinar de Humanidades 

Paula María Montoya-Pfeiffer, Universidade de São Paulo

Instituto de Biociências

Departamento de Ecologia

Marisol Amaya-Márquez, Universidad Nacional de Colombia. Instituto de Ciencias Naturales

Instituto de Ciencias Naturales


Andersson, L. 1981. Revision of the Thalia geniculata complex (Marantaceae). Nordic Journal of Botany, 1(1), 48-56. DOI: 10.1111/j.1756-1051.1981.tb01034.x

Arizaga, S., & Ezcurra, E. 1995. Insurance against reproductive failure in a semelparous plant: Bulbil formation in Agave macroantha flowering stalks. Oecologia, 101(3), 329-334. DOI: 10.1007/BF00328819

Austerlitz, F., Gleiser, G., Teixeira, S., & Bernasconi, G. 2012. The effects of inbreeding, genetic dissimilarity and phenotype on male reproductive success in a dioecious plant. Proceedings of the Royal Society B: Biological sciences, 279(1726), 91-100. DOI: 10.1098/rspb.2011.0652

Benitez-Vieyra, S., Moré, M., & Amorim, F. 2014. Seleção fenotípica mediada por polinizadores. In: A. R. Rech, K. Agostini, P. E. A. M. Oliveira, & I. C. Machado (Eds.), Biologia da Polinização. Rio de Janeiro: Editora Projeto Cultural: p. 524.

Best, L., & Bierzychudek, P. 1982. Pollinator foraging on foxglove (Digitalis purpurea): A test of a new model. Evolution, 36(1), 70-79. DOI: 10.2307/2407968

Brito, V. L. G., Telles, F., & Lunau, K. 2014. Ecologia cognitiva da polinização. In: A. R. Rech, K. Agostini, P. E. A. M. Oliveira, & I. C. Machado (Eds.), Biologia da Polinização. Rio de Janeiro: Editora Projeto Cultural: p. 524.

Cadavid-Garcia, E.A. 1984. O clima no Pantanal Mato- Grossense. Corumbá: EMBRAPA/UEPAE: p. 42.

Caruso, C. M., Eisen, K. E., Martin, R. A., & Sletvold, N. 2018. A meta-analysis of agents of selection on floral traits. Evolution 73(1), 4-14. DOI: 10.1111/evo.13639

Classßen-Bockhoff, R. 1990. Pattern analysis in pseudanthia. Plant Systematics and Evolution 171, 57-88. DOI: 10.1007/BF00940596

Claßen-Bockhoff, R. 1991. Investigations on the construction of the pollination apparatus o Thalia geniculata (Marantaceae). Botanica Acta, 104(3), 183-193. DOI: 10.1111/j.1438-8677.1991.tb00215.x

Claßen-Bockhoff, R., & Heller, A. 2008. Floral synorganization and secondary pollen presentation in four marantaceae from Costa Rica. International Journal of Plant Sciences, 169(6), 745-760. DOI: 10.1086/588069

Cruden, R.W. 2000. Pollen grains: why so many? Plant Systematics and Evolution, 222, 143-165.

Davis, M. A. 1987. The role of flower visitors in the explosive pollination of Thalia geniculata (Marantaceae), a Costa Rican marsh plant. Bulletin of the Torrey Botanical Club, 114(2), 134-138. DOI: 10.2307/2996122

Giurfa, M., Vorobyev, M., Kevan, P., & Menzel, R. 1996. Detection of coloured stimuli by honeybees: minimum visual angles and receptor specific contrasts. Journl of Comparative Physiology A, 178, 699-709. DOI: 10.1007/BF00227381

Goulson, D., Sout, J. C., Hawson, S. A., & Allen, J. A. 1998. Floral display size in comfrey, Symphytum officinale L. (Boraginaceae): relationships with visitation by three bumblebee species and subsequent seed set. Oecologia, 113(4), 502-508. DOI: 10.1007/s004420050402

Fenster, C. B., Diggle, P. K., Barrett, S. C. H., & Ritland, K. 1995. The genetics of floral development differentiating two species of Mimulus. Heredity, 74, 258-266.

Harder, L. D., & Wilson, W. G. 1994. Floral evolution and male reproductive success: Optimal dispensing schedules for pollen dispersal by animal-pollinated plants. Evolutionary Ecology, 8(5), 542-559. DOI: 10.1007/BF01238257

Hawkeswood, T. J., & Sommung, B. 2016. Observations on nectar robbing of Thalia geniculata L. (Marantaceae) flowers by two species of hawkmoths (Lepidoptera: Sphingidae) in Thailand. Calodema, 417, 1-5.

Jerominek, M., Will, M., & Claßen-Bockhoff, R. 2018. Insights into the inside - A quantitative histological study of the explosively moving style in Marantaceae. Frontiers in Plant Science, 9, 1695. DOI: 10.3389/fpls.2018.01695

Jesson, L. K., & Barrett, S. C. H. 2002. The genetics of mirror-image flowers. Proceedings of the Royal Society of London - Series B: Biological Sciences, 269(1502), 1835-1839. DOI: 10.1098/rspb.2002.2068

Jesson, L. K., & Barrett, S. C. H. 2003. The comparative biology of mirror-image flowers. International Journal of Plant Sciences, 164(5), 237-249.

Leite, A. V., & Machado, I. C. 2007. Fenologia reprodutiva, biologia floral e polinizadores de duas espécies simpátricas de Marantaceae em um fragmento de Floresta Atlântica, nordeste do Brasil. Revista Brasileira de Botânica, 30(2), 221-231. DOI:10.1590/S0100-84042007000200007

Ley, A. C., & Claßen-Bockhoff, R. 2009. Pollination syndromes in African Marantaceae. Annals of Botany, 104(1), 41-56. DOI: 10.1093/aob/mcp106

Kirchoff, B. K. 1986. Inflorescence structure and development in the Zingiberales: Thalia geniculata (Marantaceae) Canadian. Journal of Botany, 64(4), 859-864. DOI: 10.1139/b86-112

Rathcke, B. 1983. Competition and facilitation among plants for pollination. In: L. Real (Ed.), Pollination biology. pp. 305-329. Orlando: Academic Press Inc..

Rodríguez, I., Gumbert, A., Ibarra, N. H., Kunze, J., & Giurfa, M. 2004. Symmetry is in the eye of the 'beeholder' innate preference for bilateral symmetry in flower-naive bumblebees. Naturwissenschaften 91(8), 374-377. DOI: 10.1007/s00114-004-0537-5

Silva, M. P., Mauro, R., Mourão, G., & Coutinho, M. 2000. Distribuição e quantificação de classes de vegetação do Pantanal através de levantamento aéreo. Revista Brasileira de Botânica, 23(2), 143-152.

Stephenson, A. G., & Bertin, R. I. 1983. Male competition, female choice and sexual selection in plants, pp. 110-151. In: L. Real (Ed.), Pollination biology. Orlando: Academic Press Inc.