Abstract
The 71 species of horseshoe bat (genus Rhinolophus) use echolocation calls with long constant-frequency (CF) components to detect and localize fluttering insects which they seize in aerial captures or glean from foliage. Here we describe ground-gleaning as an additional prey-capture strategy for horseshoe bats. This study presents the first record and experimental evidence for ground-gleaning in the little-studied Blasius’ horseshoe bat (Rhinolophus blasii). The gleaning bouts in a flight tent included landing, quadrupedal walking and take-off from the ground. The bats emitted echolocation calls continuously during all phases of prey capture. Both spontaneously and in a choice experiment, all six individuals attacked only fluttering insects and never motionless prey. These data suggest that R. blasii performs ground-gleaning largely by relying on the same prey-detection strategy and echolocation behaviour that it and other horseshoe bats use for aerial hawking.
We also studied the Mediterranean horseshoe bat (R. euryale) in the flight tent. All four individuals never gleaned prey from the ground, though they appeared to be well able to detect fluttering moths on the ground. It is not known yet whether ground-gleaning plays a role in Mehely’s horseshoe bat (R. mehelyi). In a performance test, we measured the ability of these three European species of “middle-sized” horseshoe bats (R. euryale, R. mehelyi and R. blasii) to take-off from the ground. All were able to take flight even in a confined space; i.e. the willingness to ground-glean in R. blasii is not related to a superior take-off performance. In contrast to ground-gleaning bats of other phylogenetic lineages, R. blasii appears not to be a specialist, but rather shows a remarkable behavioural flexibility in prey-capture strategies and abilities. We suggest that the key innovation of CF echolocation paired with behavioural flexibility in foraging strategies might explain the evolutionary success of Rhinolophus as the second largest genus of bat.
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Acknowledgements
We thank Ivailo Borissov, Christian Dietz, Isabel Schunger and Dietmar Nill for help in the field, and Svetlana Miteva, Christo Christov and Elena Bojinova for hospitality and help at the Madjaruvo Vulture Center field station. Dr. Stojan Beshkov kindly determined species identity of the moth remains. We thank Christoph König and Ingrid Kaipf for excellent technical assistance, as well as Klemen Koselj, Christian Dietz and Dr. Arjan Boonman for discussion. We gratefully acknowledge the valuable comments by Drs. Danilo Russo, Brock Fenton and an anonymous referee that helped to improve the manuscript. Our research was funded by a special project grant from the University of Tübingen and by the Deutsche Forschungsgemeinschaft (DFG Si 816/2-1). The study was performed with permission from the responsible Bulgarian authorities and experiments complied with Bulgarian laws.
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Siemers, B.M., Ivanova, T. Ground gleaning in horseshoe bats: comparative evidence from Rhinolophus blasii, R. euryale and R. mehelyi . Behav Ecol Sociobiol 56, 464–471 (2004). https://doi.org/10.1007/s00265-004-0807-4
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DOI: https://doi.org/10.1007/s00265-004-0807-4