Vocalization Repertoire of the Five Striped Palm Squirrel, Funambulus pennantii pennantii: An Ethological Study

The five striped palm squirrel, Funambulus pennantii pennantii is native to Northern India, Iran, Pakistan and Bangladesh. The vocal communication of F. p. pennantii was studied at four different sites at Agra district of Uttar Pradesh, India. These sites were selected on the basis of maximum cluster locations and movements of squirrels tracked by the GPS tracking device GARMIN eTrex 10. The locations data was uploaded on QGIS open access software to map the sites. To record the vocalizations of squirrels, the AE mini digital recording device was used. Since this species enjoys the Least Concern (LC) status, Godden’s formula for infinite population was employed to determine the sample size, which was approximately 400 squirrels. To generate the audio spectrograms of squirrel vocalizations, MATLAB software version R2019b was used. Photography and videography were done through ad libitum sampling technique with NIKON COOLPIX 500 camera. Four distinct patterns emerged in the audio spectrograms, and they were identified as four distinct call types. The Buzz is a mating and play call. It is also used by mothers to communicate with their juveniles. The Growl is a threat call and is followed by chase or attack. The Bark is an alarm call which is of two types- a predator class specific alarm call for aerial predators and another predator class specific alarm call for terrestrial predators. The Rattle is a territorial declaration by squirrels as their routine at a specific time of a day. This is the first report of acoustic identification and analysis of calls of F. p. pennantii in their behavioral contexts.

Funambulus, Vocalization, MATLAB, Acoustic, Ethology

1. Agarwal, D., & Bhatnagar, R. (2019). Comprehensive review of the current status of ethological studies on Funambulus pennantii (Wroughton, 1905), the five striped northern palm squirrel. [Google Scholar] [Crossref]

2. Altmann, J., 1974. Observational study of behaviour. Behaviour 49:227-267. [Google Scholar] [Crossref]

3. Csurhes, S. (2016). Invasive plant risk assessment. Bitou bush. Department of Agriculture and Fisheries Biosecurity Qld. [Google Scholar] [Crossref]

4. Davis, L. I. (1964). Biological acoustics and the use of the sound spectrograph. Southwestern Nat., 9:118-145. [Google Scholar] [Crossref]

5. Deshwal, R., Tiwari, D., & Singh, R. (2017). Clinical and biochemical characteristics of exertional heat stroke among paratroopers in Agra, India. J Assoc Physicians India, 65(2), 57-61. [Google Scholar] [Crossref]

6. Diggins, C. A. (2021). Behaviors associated with vocal communication of squirrels. Ecosphere, 12(6), e03572. [Google Scholar] [Crossref]

7. Eason, P. 2010. Alarm signaling in a facultatively social mammal, the southern Amazon red squirrel Sciurus spadiceus. Mammalia 74:343–345. [Google Scholar] [Crossref]

8. Ghose, R. K., Mandal, A. K., & Ghosh, P. S. (2004). A contribution to the taxonomy of Indian five striped squirrel (Funambulus pennanti, Wroughton), with description of two new subspecies. Records of the Zoological Survey of India, 102(3-4), 89-103. [Google Scholar] [Crossref]

9. Godden, B. (2004). Sample size formula, Journal of statistics, 3(66), 1. [Google Scholar] [Crossref]

10. Greene, E., & Meagher, T. (1998). Red squirrels, Tamiasciurus hudsonicus, produce predator-class specific alarm calls. Animal Behaviour, 55(3), 511-518. [Google Scholar] [Crossref]

11. Gurnell, J. 1987. The natural history of squirrels. Facts on File Publications, New York, New York, USA. [Google Scholar] [Crossref]

12. Judas, J., & Hellyer, P. (2016). Five-striped Palm Squirrel, Funambulus pennantii (Wroughton, 1905)-a new addition to the UAE's exotic fauna. Tribulus, 24, 126-130. [Google Scholar] [Crossref]

13. Khan, Z. & Khan, J. A. (1980). food preferences of" five-stripe" squirrel, Funambulus pennanti pennanti Wroughton. [Google Scholar] [Crossref]

14. Koeppl, J. W., Hoffmann, R. S., & Nadler, C. F. (1978). Pattern analysis of acoustical behavior in four species of ground squirrels. Journal of Mammalogy, 59(4), 677-696. [Google Scholar] [Crossref]

15. Koli, V. K., and C. Bhatnagar. 2014. Calling activity of Indian giant flying squirrel (Petaurista philippensis Elliot, 1839) in the tropical deciduous forests, India. Wildlife Biology in Practice 10:102–110. [Google Scholar] [Crossref]

16. Koli, V. K., Bhatnagar, C., & Sharma, S. K. (2011). A Note on Whistle Alarm Calls of Three-striped Palm Squirrel Funambulus palmarum linnaeus in Sitamata Wildlife Sanctuary, Rajasthan, India. Journal of the Bombay Natural History Society (JBNHS), 108(1), 53-55. [Google Scholar] [Crossref]

17. Lair, H. 1990. The calls of the red squirrel: a contextual analysis of function. Behavior 115:254–282. [Google Scholar] [Crossref]

18. Leger, D. W., Berney-Key, S. D., & Sherman, P. W. (1984). Vocalizations of Belding's ground squirrels (Spermophilus beldingi). Animal Behaviour, 32(3), 753-764. [Google Scholar] [Crossref]

19. Lenti Boero, D. 1992. Alarm calling in Alpine marmot (Marmota marmot L.): evidence for semantic communication. Ethology, Ecology, and Evolution 4:125–138. [Google Scholar] [Crossref]

20. Loughry, W. J., M. Oeser, C. D. Anderson, and J. L. Hoogland. 2019. The importance of individual variation in the alarm calls of Gunnison’s prairie dogs. Animal Behaviour 150:59–68. [Google Scholar] [Crossref]

21. Macedonia, J. M. & Evans, C. S. 1993. Variation among mammalian alarm call systems and the problem of meaning in animal signals. Ethology, 93, 177–197. [Google Scholar] [Crossref]

22. Malhi, C. S., & Kaur, K. (1995). Responses of Funambulus pennanti Wroughton (Rodentia, Sciuridae) towards different food additives. [Google Scholar] [Crossref]

23. Okanoya, K., and L. A. Screven. (2018). Rodent vocalizations: adaptations to physical, social, and sexual factors. Pages 13–41 in M. L. Dent, R. R. Fay, and A. N. Popper, editors. Rodent bioacoustics. Springer, Cham, Switzerland. [Google Scholar] [Crossref]

24. Rajaratnam, S. M., & Redman, J. R. (1997). Effects of daily melatonin administration on circadian activity rhythms in the diurnal Indian palm squirrel (Funambulus pennanti). Journal of biological rhythms, 12(4), 339-347. [Google Scholar] [Crossref]

25. Rajaratnam, S. M., & Redman, J. R. (1998). Entrainment of activity rhythms to temperature cycles in diurnal palm squirrels. Physiology & behavior, 63(2), 271-277. [Google Scholar] [Crossref]

26. Rajaratnam, S. M., & Redman, J. R. (2001). Circadian locomotor activity rhythms of the diurnal Indian palm squirrel in constant light. Chronobiology international, 18(1), 47-60. [Google Scholar] [Crossref]

27. Rogers, L. J., Kaplan, G. T. (2002). Songs, Roars, and Rituals: Communication in Birds, Mammals, and Other Animals. United States: Harvard University Press. [Google Scholar] [Crossref]

28. Sharma, R. (2016). Reproductive behavior of Funambulus pennantii A case study of Ajmer Rajasthan. IOSR Journal of pharmacy and biological sciences, 11(4), 51-53. [Google Scholar] [Crossref]

29. Shelly, E. L., and D. T. Blumstein. 2004. The evolution of vocal alarm communication in rodents. Behavioral Ecology 16:169–17. [Google Scholar] [Crossref]

30. Siracusa, E., M. Morandini, S. Boutin, M. M. Humphries, B. Dantzer, J. E. Lane, and A. G. McAdam. 2017. Red squirrel territorial vocalizations deter intrusions by conspecific rivals. Behavior 154:1259– 1273. [Google Scholar] [Crossref]

31. Smith, C. C. (1978). Structure and function of the vocalizations of tree squirrels (Tamiasciurus). Journal of Mammalogy, 59(4), 793-808. [Google Scholar] [Crossref]

32. Victor, R., & Cuellar Soto, E. (2020). A preliminary study on the status of invasive palm squirrels in Oman. International Journal of Environmental Studies, 77(5), 727-738. [Google Scholar] [Crossref]

33. Wanniarachchi, S., & Wijesundara, C. S. (2016). The repertoire and structure of vocalizations of the Southern Magpie Robin (Copsychus saularis ceylonensis) in the Kandy region, Sri Lanka. Ceylon Journal of Science, 45(3). [Google Scholar] [Crossref]

34. Wilson DR, Goble AR, Boutin S, Humphries MM, Coltman DW, Gorrell JC, Shonfield J, McAdam AG (2015) Red squirrels use territorial vocalizations for kin discrimination. Animal Behaviour, 107: 79–85. [Google Scholar] [Crossref]

35. www.agra.nic.in, Government of Uttar Pradesh. [Google Scholar] [Crossref]

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