Pollination biology of Humiria balsamifera var. floribunda (Humiriaceae) on the coast of Maranhão, Brazil

Rafael Sousa Pinto, Joana Viviane Dos Anjos, P. Albuquerque
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Abstract

Research into pollination ecology provides information on plant reproduction, interactions with pollinators and biodiversity conservation. Humiria balsamifera occurs only in South America and presents an infraspecific complex with 10 varieties recorded in the most recent taxonomic revision. The current study aimed to evaluate the phenological events of flowering and fruiting, floral biology, floral visitors, and the reproductive system of H. balsamifera var. floribunda, in a restinga area in Maranhão, Brazil, in the year 2017. The production of floral buds, flowers, and fruits in 20 individuals was evaluated by the Fournier method. The phenophases presented no correlations with temperature, humidity, and rainfall, except for the production of immature fruits, which increased in the drier months. The species presents a large number of flowers in cymose-paniculate inflorescences, which open at 7:00 am and last less than a day. Nectar is the main resource exploited by the floral visitors. In all, 1393 floral visitors were observed distributed in 49 morphospecies, 94.75% of which were bees and wasps, including Melipona subnitida, Apis mellifera, Xylocopa cearensis, Melipona fasciculata, Polybia sericea and Megalopta amoena as the most abundant. Visitor activity occurred in all daytime hours and months of the year, but the abundance of specimens increased with flowering and reduced rainfall. Reproductive system tests indicated that H. balsamifera var. floribunda presents facultative xenogamy, requiring pollen vectors for its reproductive success. This work reinforces data on other varieties of the species and demonstrates the environmental importance of the plant to sustain fauna.
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巴西马拉尼昂州海岸的 Humiria balsamifera var.
授粉生态学研究提供了有关植物繁殖、与授粉者互动和生物多样性保护的信息。Humiria balsamifera 仅分布于南美洲,是一个种下复合体,在最近的分类修订中记录了 10 个变种。目前的研究旨在评估2017年巴西马拉尼昂州一个休憩区内的H. balsamifera var.用福尼尔法评估了20个个体的花芽、花和果实的产量。除了未成熟果实的产量在较干旱的月份有所增加外,其他物候期与温度、湿度和降雨量均无相关性。该物种在聚伞状圆锥形花序中开出大量花朵,花朵在早上 7 点开放,花期不到一天。花蜜是访花者利用的主要资源。总共观察到 1393 种访花者,分布在 49 个形态种中,94.75% 是蜜蜂和黄蜂,其中最多的是 Melipona subnitida、Apis mellifera、Xylocopa cearensis、Melipona fasciculata、Polybia sericea 和 Megalopta amoena。访客的活动发生在全年的所有白天时段和月份,但标本的数量随着花期和降雨量的减少而增加。繁殖系统测试表明,H. balsamifera var.这项工作加强了关于该物种其他变种的数据,并证明了该植物对维持动物群落的环境重要性。
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