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Bat Pollination in Bromeliaceae Pedro A PLANT ECOLOGY & DIVERSITY https://doi.org/10.1080/17550874.2019.1566409 ARTICLE Bat pollination in Bromeliaceae Pedro A. Aguilar-Rodrígueza, Thorsten Krömer a, Marco Tschapka b,c, José G. García-Francod, Jeanett Escobedo-Sartie and M.Cristina MacSwiney G. a aCentro de Investigaciones Tropicales, Universidad Veracruzana, Xalapa, Veracruz, Mexico; bInstitute of Evolutionary Ecology and Conservation Genomics, University of Ulm, Ulm, Germany; cSmithsonian Tropical Research Institute, Balboa Ancón, Panamá, República de Panamá; dRed de Ecología Funcional, Instituto de Ecología, Xalapa, Veracruz, México; eFacultad de Ciencias Biológicas y Agropecuarias, Universidad de Colima, Crucero de Tecomán, Tecomán, Colima, México ABSTRACT ARTICLE HISTORY Background: Chiropterophily encompasses the floral traits by which bats are attracted as the Received 2 May 2017 main pollinators. Among the chiropterophilous flowering plants of the New World, Accepted 3 January 2019 Bromeliaceae is one of the most ecologically important families; however, information KEYWORDS about the chiropterophilous interaction in this family is still scarce. Anoura; bromeliads; Aims: We present a comprehensive review of bat pollination in bromeliads, covering floral chiropterophily; floral scent; traits, rewards offered to pollinators, floral attractants and the identity of visiting bat species. nectar; pollination; Werauhia Methods: We discuss traits shared among chiropterophilous bromeliads and present general trends in an evolutionary context. We constructed a phylogenetic tree to elucidate the ancestral pollination syndromes of the 42 extant bromeliad species (ca. 1% of total) known to be bat-pollinated. Results: Most of the species within the ten genera reported belong to the Tillandsioideae subfamily, with three genera appearing to be exclusively bat-pollinated. Floral visitors include 19 bat species of 11 genera from the Phyllostomidae. Conclusions: Our analysis indicated that chiropterophilous floral features originated multiple times in bromeliad evolution, most probably from ornithophilous. The evidence for floral traits associated with bat pollination and the chiropterophilous syndrome presented by certain Bromeliaceae indicate the important role played by bats in the evolution of this plant family. Introduction 500 plant species (Dobat and Peikert-Holle 1985; Fleming et al. 2009). The chiropterophily syndrome The floral syndrome concept has been criticised may encompass the following characteristics (van der for failing to consider the complete diversity of Pijl 1961;vonHelversen1993;vonHelversenetal. floral traits, as well as the entire spectrum of floral 2000;TschapkaandDressler2002;vonHelversenand visitors (Ollerton et al. 2009). Nevertheless, it Winter 2003;Krömeretal.2008;Rosas-Guerreroetal. remains a useful tool for predicting the main pol- 2014): (1) nocturnal or crepuscular anthesis; (2) pale linators of plants, especially in tropical regions or dullish colours in the perianth (predominantly (Rosas-Guerrero et al. 2014;Ashworthetal.2015 white, pale green, yellow) without nectar lines; (3) and references therein). This seems to be the case flagelliflory (flowers suspended on long stalks, situated for bat-pollinated plant species, which tend to at a distance from the branches and leaves) and/or possess flowers that are morphologically distinct cauliflory (flowers emerging directly from the tree from those of other pollination guilds (von trunk or from larger branches); (4) tubular, zygo- Helversen 1993;FlemingandMuchhala2008). morphic or radially symmetrical flowers that fitthe Chiropterophily, or the syndrome of pollination via snout of the bat like a ‘mask’,andalso‘brush-type’ interaction with bats, encompasses the floral traits (e.g. flowers/inflorescences with protruding stamens; (5) size, shape, colour, nectar characteristics and scent) large and sturdy flowers; (6) musty or unpleasant shared by many angiosperms in order to attract bats odour, described as garlic- or onion-like; (7) relatively (Mammalia: Chiroptera) as their main pollinators large amounts of dilute nectar with an average sugar (Tschapka and Dressler 2002;vonHelversenand concentration of ca.17%,andapredominantlyhex- Winter 2003;Flemingetal.2009). Bat pollination ose-rich composition (e.g. low sucrose content, high occurs in the tropical and subtropical regions of both levels of glucose and fructose); (8) large quantities of the Old and New World and is found in more than CONTACT M. Cristina MacSwiney G. [email protected] Supplemental data for this article can be accessed here. © 2019 Botanical Society of Scotland and Taylor & Francis 2 P. A. AGUILAR-RODRÍGUEZ ET AL. pollen and, in some cases, (9) edible plant tissues as are the second most common vertebrate pollinators of rewards (see Cox 1984;Cunningham1995). However, the Bromeliaceae, more frequently reported than pas- these characteristics are highly variable among plant serine birds or opossums, and surpassed only by hum- families and some of the allegedly chiropterophilous mingbirds (Trochilidae) (Martinelli 1994, 1997; traits (such as nocturnal anthesis) are not exclusive to Kessler and Krömer 2000;Araujoetal.2004;Canela plants pollinated by bats. A possible explanation for and Sazima 2005;Hornung-LeoniandSosa2006; this is that bats present relatively low floral constancy, Krömer et al. 2006;Queirozetal.2016). Most of our so a bat can visit flowers of many species in a single current knowledge of bat-pollinated bromeliads, night and will thus frequently deliver mixed pollen defined as species in which bats perform most of the loads to receptive stigmas (Fleming et al. 2005; legitimate visits to the flowers, comes from opportu- Muchhala et al. 2008;butseeevidencefordifferential nistic observations. Comprehensive and quantitative pollen placement by bats in Muchhala and Thomson information remains scarce, and a detailed under- 2012;StewartandDudash2016). In this sense, most standing of the reproductive biology exists for only a bat-pollinated plants have evolved as a pollination- few species (e.g. Pitcairnia albiflos, Pseudalcantarea guild, comprising non-related species that share a macropetala, Werauhia gladioliflora;Aguilar- pollinator with similar behaviour and morphology Rodríguez et al. 2014;Wendtetal.2001;Cascante- (Muchhala and Jarrín-V 2002)ratherthanbeingspe- Marín et al. 2005;TschapkaandvonHelversen2007). cialised to one bat species pollinating only one plant Variation in floral adaptations exhibited by species (but see Centropogon nigricans and the bat Bromeliaceae probably accounts for their adaptability Anoura fistulata;Muchhalaetal.2005;Muchhala in terms of changing traits associated with different and Thomson 2009). pollinators and reproductive systems, even between The study of bat-pollination has developed closely related species (Gardner 1986;Varadarajan considerably since the early observations of and Brown 1988;Benzing2000;Givnishetal.2014). Moseley (1870)andBurck(1892). The beginning To consolidate the rather scattered information of formal studies dates back to the 1930s and 1960s currently available, we present a comprehensive (e.g. Porsch 1932 or Vogel 1958, 1969;seealsovan review based on all available reports of bat polli- del Pijil 1961). Classic studies by Faegri and van nation in the Bromeliaceae, including the identity der Pijl (1979)andDobatandPeikert-Holle of bat species involved where available. We (1985)thenprovideddetailedinformationabout obtained information about chiropterophilous the chiropterophilous syndrome and confirmed a bromeliads from an extensive review of the avail- number of bat-pollinated plants, to which other able literature, as well as common scientificdata- examples have since been added (e.g. Fleming et bases including ISI Web of Science, SciELO and al. 2009;GeiselmanandDefex2015). Redalyc and internet search engines such as The Bromeliaceae is one of the most frequently Google Scholar, using operators such as ‘chirop- reported bat-pollinated plant families (von Helversen terophily’ and ‘bromeliads’ or ‘Bromeliaceae’; 1993;Flemingetal.2009). It includes more than 3500 ‘bat-pollination’ and ‘Anoura’, ‘Glossophaga’ herbaceous species from 70 genera (Barfuss et al. 2016; and ‘Lonchophylla’; ‘Alcantarea’, ‘Encholirium’, Gouda et al. 2017). The specialised nectarivorous bats ‘Pitcairnia’, ‘Puya’, ‘Vriesea’ and ‘Werauhia’’, responsible for most reports of bat-pollination in the either in the title, keywords or abstract. In addi- Neotropics are found within the subfamilies tion, we searched the grey literature (e.g. theses) Glossophaginae and Lonchophyllinae, among the and cross-checked references between studies, highly diverse leaf-nosed bats (Phyllostomidae). including those provided in Fleming et al. (2009) These bats comprise 20 genera and more than 50 and Geiselman and Defex (2015), as well as asking species (Simmons 2005;Mantilla-MelukandBaker certain authors to suggest publications related to 2010;Bolzanetal.2015;MoratelliandDias2015; the topic (see Acknowledgements). Furthermore, Cirranello et al. 2016). in order to improve our understanding of the Pollination by vertebrates occurs within the evolution of chiropterophily in the Bromeliaceae, Bromeliaceae more frequently than insect pollination we constructed a phylogenetic tree for the family, (Benzing 2000;KesslerandKrömer2000;Canela based on chloroplast (cp) DNA sequence varia- and Sazima 2005;Krömeretal.2006)andsome tion, and used this tree as a means to examine species, especially among the Tillandsioideae and the origin of chiropterophily in different
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