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Flower‐vising bats are important components of tropical pollinator communities, yet little is known about the structure of their pollination networks and how resource availability through time (seasons) and space (habitat heterogeneity) affects the extent to which bats interact with plants within a community‐wide context. This information is key for the conservation of threatened nectarivore species, such as the Cerrado‐endemic Lonchophylla dekeyseri, for which data on its specialization on floral‐resources is scarce. Within a seasonal and heterogeneous savanna in the central Brazilian Cerrado, we performed a year‐round assessment of an inclusive assemblage of flower‐visiting bats (both nectarivores and other guilds that can also feed on nectar) within a savanna‐edge‐forest gradient, the phenological trends and spatial distribution of bat and their resource plants, and the resultant temporal and spatial interaction networks between bats and plants in order to associate network structure to resource availability. Clear spatiotemporal trends emerged in the community. Nectarivores dominated the flower‐visiting niche outside forests and were prolific floral visitors, resulting in networks with lower specialization and modularity. These bats diverged into savanna foragers active during the wet season and the wet‐dry transition, and edge foragers active mostly during the dry season. The latter group encompassed L. dekeyseri, which visited mostly Bauhinia species. Frugivores took over as main floral visitors within forests, as well as during peak dry season, when fewer fruits were available, resulting in more specialized and modular networks. Our work shows that the turnover of floral resources across seasons and vegetation types has a defining role in bat–plant interactions and relates to network structure, as bat trophic guilds interact with plants in distinct habitats and times of the year. Frugivores dominate the flower‐visiting niche in certain temporal and spatial subsets of the network, which calls for the inclusion of this guild in future studies. Moreover, the high visitation to Bauhinia species by L. dekeyseri during the dry season might reduce competition with other nectarivores and is relevant to the management of the species, although more data is needed on its resource consumption on a larger time frame and across its geographic range.
Journal of Animal Ecology – Wiley
Published: Jul 1, 2023
Keywords: bat pollination; Cerrado; chiropterophily; habitat heterogeneity; interaction networks; Lonchophylla dekeyseri; modularity; phenology
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