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1

Daily and seasonal variation in non-acoustic communicative behaviors of male greater short-nosed fruit bats (Cynopterus sphinx)

100%
Doss D. P. S., Nagarajan-Radha V., Kandula S.
Acta Chiropterologica
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2016
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tom 18
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nr 1
Monthly observations were made at a natural roosting site of Cynopterus sphinx, with a view to the behavior of males being observed over a period of one year. Here, we report seasonal, daily and inter-individual variation in three communicative behaviors engaged in by male bats. The frequency of male behaviors identified as scent-marking, vigorous wing-flapping and the making of an openwing gesture were found to vary seasonally, depending on the reproductive status of conspecific females in the study colony. The duration of scent-marking was markedly high during mating seasons, in comparison with wing-flapping and wing-gesturing. In mating seasons, the pattern to the daily variation in behavior correlated strongly with the gender of the responder present in the diurnal roost and/or colony. For instance, scent-marking and vigorous wing-flapping were more frequent during late-evening and early-morning hours, mostly when females were absent from the day roost, while male-male encounters were possible. In contrast, wing-gesturing was more frequent during morning and early-evening hours, when females were present in the day roost. The results from our study suggest that male scent-marking and wing-flapping are directed towards competitor males in the colony, with a view to resource-defense behavior being manifested. Furthermore, male wing-gesturing is predicted to be directed towards co-roosting females, with the aim in this case being for some form of social information to be communicated, particularly during the mating season. However, marginal inter-individual variation in the frequency of occurrence of behaviors between seasons was apparent, suggesting that these communicative behaviors could be tied to male-male competition in this species.
2

Isolation and characterization of cellulose-degrading and xylanolytic bacteria from the short-nosed fruit bat Cynopterus sphinx

100%
Anand A. A. P., Chattopadhyay B., Kandula S.
Acta Chiropterologica
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2012
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tom 14
|
nr 1
Cynopterus sphinx is a frugivorous bat also known to feed regularly on leaves. This raises the question whether microorganisms capable of digesting such a diet are present in the gut. In the present study cellulolytic and xylanolytic bacteria were isolated from the intestine of C. sphinx on Berg's agar medium containing carboxymethyl cellulose and xylan. The isolated cultivable cellulose and xylan degrading bacteria were characterized biochemically and identified to be Bacillus sp., Clostridium sp., Streptococcus sp., and Staphylococcus sp. Among the cultivable bacteria from the intestine of the insectivorous Hipposideros fulvus, which was used as a control, no cellulolytic and xylanolytic bacteria could be isolated. We hypothesize that leaves could be a carbohydrate source for bats. By isolating polysaccharide-degrading bacteria from the intestine of C. sphinx, we infer that they help in digestion of xylan and soluble cellulose in their diet.
3

Effects of different surfaces on the perception of prey-generated noise by the Indian false vampire bat Megaderma lycra

88%
Marimuthu G., Rajan K. E., Kandula S., Parsons S., Jones G.
Acta Chiropterologica
|
2002
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tom 04
|
nr 1
The low- and high-frequency components of a rustling sound, created when prey (freshly killed frog) was jerkily pulled on dry and wet sandy floors and asbestos, were recorded and played back to individual Indian false vampire bats (Megaderma lyra). Megaderma lyra responded with flight toward the speakers and captured dead frogs, that were kept as reward. The spectral peaks were at 8.6, 7.1 and 6.8 kHz for the low-frequency components of the sounds created at the dry, asbestos and wet floors, respectively. The spectral peaks for the high-frequency sounds created on the respective floors were at 36.8, 27.2 and 23.3 kHz. The sound from the dry floor was more intense than that of from the other two substrata. Prey movements that generated sonic or ultrasonic sounds were both sufficient and necessary for the bats to detect and capture prey. The number of successful prey captures was significantly greater for the dry floor sound, especially to its high-frequency components. Bat-responses were low to the wet floor and moderate to the asbestos floor sounds. The bats did not respond to the sound of unrecorded parts of the tape. Even though the bats flew toward the speakers when the prey generated sounds were played back and captured the dead frogs we cannot rule out the possibility of M. lyra using echolocation to localize prey. However, the study indicates that prey that move on dry sandy floor are more vulnerable to predation by M. lyra.
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