title: Predation-risk effects of predator identity on the foraging behaviors of frugivorous bats.
abstract: Predators directly and indirectly affect the density and the behavior of prey. These effects may potentially cascade down to lower trophic levels. In this study, we tested the effects of predator calls (playbacks of bird vocalizations: Tyto alba, Speotyto cunicularia, and Vanellus chilensis), predator visual stimuli (stuffed birds) and interactions of visual and auditory cues, on the behavior of frugivore phyllostomid bats in the field. In addition, we tested if the effects of predation risk cascade down to other trophic levels by measuring rates of seed dispersal of the tree Muntingia calabura. Using video recording, we found that bats significantly decreased the foraging frequency on trees when a visual cue of T. alba was present. However, no stimuli of potential predatory birds, including vocalization of T. alba, affected bat foraging frequency. There was a change in bat behavior during 7 min, but then their frequency of activity gradually increased. Consequently, the presence of T. alba decreased by up to ten times the rate of seed removal. These results indicate that risk sensitivity of frugivorous phyllostomid bats depends on predator identity and presence. Among the predators used in this study, only T. alba is an effective bat predator in the Neotropics. Sound stimuli of T. alba seem not to be a cue of predation risk, possibly because their vocalizations are used only for intraspecific communication. This study emphasizes the importance of evaluating different predator stimuli on the behavior of vertebrates, as well as the effects of these stimuli on trait-mediated trophic cascades.
authors: Programa de pós-graduação em Biologia Animal, UNESP, São José do Rio Preto, SP, Brazil.
authors: C P B
authors: CP
authors: Breviglieri
authors: G C O
authors: GC
authors: Piccoli
authors: W
authors: W
authors: Uieda
authors: G Q
authors: GQ
authors: Romero
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001070:Appetitive Behavior / Q000502:physiology*; D001717:Birds / Q000502:physiology*; D001938:Brazil; D002685:Chiroptera / Q000502:physiology*; D020387:Food Chain; D011235:Predatory Behavior / Q000502:physiology*; D058614:Seed Dispersal / Q000502:physiology*; D013045:Species Specificity; D013997:Time Factors; D014197:Trees / Q000502:physiology
references: PLoS One. 2011;6(6):e20689
references: 21695187
references: Ann N Y Acad Sci. 2011 Mar;1223:1-38
references: 21449963
references: Oecologia. 2004 Jan;138(1):66-73
references: 14551828
references: Ecology. 2008 Sep;89(9):2407-13
references: 18831161
references: Science. 2008 Feb 15;319(5865):952-4
references: 18276890
references: Anim Behav. 1998 Mar;55(3):705-13
references: 9514675
references: Ecology. 2009 Jan;90(1):23-30
references: 19294909
references: Am Nat. 2000 Feb;155(2):141-153
references: 10686157
references: Am Nat. 1998 Apr;151(4):327-42
references: 18811324
references: J Anim Ecol. 2007 Sep;76(5):837-44
references: 17714261
references: J Chem Ecol. 2002 May;28(5):1007-15
references: 12049223
references: Proc Natl Acad Sci U S A. 2003 Nov 25;100(24):14052-6
references: 14614145
references: Oecologia. 2001 Sep;129(1):139-146
references: 28547061