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Nocturnal Activity and Habitat Selection of Hotson Jerboa, Allactaga

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Nocturnal Activity and Habitat Selection of Hotson Jerboa, Allactaga Journal of Wildlife and Biodiversity 1(1): 33-36 (2017) by Arak University, Iran (http://jwb.araku.ac.ir/) Research Article DOI: 10.22120/jwb.2017.27208 Nocturnal activity and habitat selection of Hotson Jerboa, Allactaga hotsoni Thomas, 1920 (Rodentia: Dipodidae) Mastureh Darabi*, Zohreh Zeini, Introduction Abdolreza Karami, Ali Kaveh Bipedal locomotion is one of the important Department of Environemnt, West Hakim anatomical adaptations of the Jerboas in desert Highway, Tehran, Iran, Po Box 141557383 areas and such movement mechanisms needs * e-mail: [email protected] special physiognomic characteristics of the habitat and some special behaviors during Received: 20 July 2017 / Revised: 24 August 2017 / Accepted: 25 nocturnal activity. Better and faster entering to August 2017 / Published online: 31 August 2017. Ministry of Sciences, Research and Technology, Arak University, Iran. the burrows in full moon status is a critical behavior in anti-predatory mechanisms (Hemami et al. 2011). Abstract Investigation about the North American desert Investigation about the activity pattern of the rodents showed that nocturnal activity of these Hotson Jerboa with motorcycle and search light rodents completely related to the moonlight indicated that there is significant relationship status (Wolfe and Summerline 1989, Butynski between moon light intensity and encountering 1984, Kotler et al. 1988, Lockard and Owings with the Hotson Jerboa’ or it’s trapping success. 1974). Such significant relationships had been The results showed that the more moon light reported for other mammal’s members too for intensity the less the activity of this Jerboa. In example lagomorphs (Butynski 1984, Gilbert the other word we can infer that the encounter and Boutin 1991), badgers (Cresswell and rate with the individuals reaches its highest Harris 1988), Opossums (Laferriere 1997). amount in the first and the last days of the lunar All of these studies have shown that these month and closing to the middle weeks of the mammals reacted to an increase in the intensity month, they hardly can be detected. Although in of nocturnal illumination by reducing the use of completely cloudy nights even in the middle of open space, restricting foraging activity, the month the encounter rate increased as well. microhabitat shifts movements, or the duration This is a predator-prey coevolutional of the period of activity; or by switching the mechanism that lowers the predation risk. activity to dark periods, an antipredation Additionally, the activity shifted somewhat from adaptation (Abramsky et al. 2004). Price et al. the open to vegetation cover when the moon was (1984) reported that bright moonlight reduces high, however the least encounter rate was the overall activity of nocturnal rodents. In recorded in full moon status. particular, rodents that live in sandy deserts reduce their activity and avoid open habitats on Keywords: Moon phases, Encounter rate, moonlit nights when predation risk is high Predation risk, Habitat preferences. (Lockard and Owings 1974, Kaufman and 34 | Journal of Wildlife and Biodiversity 1(1): 33-36 (2017) Kaufman 1982, Kotler and Brown 1988, Kotler Data recording and statistical analysis et al. 1993). The risk of predation influences both activity pattern and habitat use (Werner et For the investigation of the possible different al. 1983, Berger 1991). Specifically, to test activity level during the lunar nights we whether the intensity of moonlight influences recorded the amount of the activity of the the activity pattern of A. hotsoni, activity of the Hotson Jerboa in different lunar nights: new individuals was recorded and compared to the moon and full moon (the first and the last weeks brightness of the moon by addressing the of the lunar month were assumed as new moon following questions: Does time allocation of and the two middle weeks as full moon) staying out of burrows and that of being active (Hemami et al. 2011). For this porpoise we have vary with the levels of moon light intensity? traversed multiple line transect with motorcycle and search light during five months by applying Material and methods the same sampling effort in different nights in Study area completely random design (each transect line on average between 10-15 km). During intensive sampling from May to Totally 1670 km were traversed in 63 nights and September 2011 we studied Hotson’s Jerboa 48 individuals were recorded during the study activity behavior with regard to moon light period. We measured encounter rate with the intensity in a arid steppe habitat located 5 km individuals in different habitat types since each north of Chupanan, Isfahan Province (33°35’N observation point was recorded by GPS. and 54°27’E ). This province was introduced as Statistical Analysis a new recorded site for the Hotson Jerboa by the authors (unpublished data). The study area For controlling temperature effect on its usually has the least rainfall in comparing to nocturnal activity pattern we measured ambient other urban and rural areas of the Isfahan air temperature and used partial correlation test. province since there is no recorded rainfall Regression analysis was used for the during June to September. investigation of correlation between the encounter rate and the lunar nights. ANOVA The mean annual precipitation in the study area was used to test significant differences in is less than 100 mm (Institute of Whether and diverse habitat vegetation type usage. The Climatology, Isfahan 2011). The vegetation Square root transformation was used in case of comprises different bush and shrub species such data non normal distribution. as Atriplex sp, Artemisia siberi, Peganum harmala, Atraphaxis spinosa, Haloxylon sp, Results Calligonum comosum, Hamada salicornica, Zygophyllum sp and Tamarix sp. Some predator The encounter rate of the individuals was higher species such as Red fox (Vulpes vulpes), Jackal in new moon than in full moon ( R 2 =0.69, t= 9.3 (Canis aureus), Sand fox (Vullpes rueppellii) and P<0.001). A partial correlation analysis in and Sand cat (Felis margarita) was observed controlling the temperature variable showed that and recorded in the study area too. The altitude this factor don’t contribute in shaping Hotson is approximately 950 m above sea level and the Jerboa’s activity pattern during spring and climate is markedly seasonal with a dry and summer seasons ( =0.43, P<0.001). It seems harsh season from May to October. The that the feeding habits of the Hotson Jerboa physiognomy of the habitat presented a total contribute to somewhat in its activity pattern woody and non-woody plant cover. since ANOVA analysis showed that there are 35 | Journal of Wildlife and Biodiversity 1(1): 33-36 (2017) significant differences in encounter rate of the Acknowledgment individuals in different habitat types (ANOVA: F=18.56, P<0.001) Totally four main habitat We thank Hossein Akbari, the head of Naein types were recorded in the study area including Departement of the Environment for his kind Calligonum comosum, Hamada salicornica, attention during field trips. Special thanks to Zygophyllum sp and Barren areas (Fig. 2). With Mohammadreza Halvani, for his devoted closing to the middle weeks and increasing cooperation in sampling and gathering moonlight, Hotson Jerboa selects more barren specimens. areas for activity and conversely in new moon References status it can be recorded more among the shrubs specially Hamada salicornica that constitute an Hemami M.R., Naderi G.H., Karami M., important feeding item. Therefore, foraging Mohammadi S. 2011. Nocturnal activity of behavior can be regarded as a reflection of the Iranian Jerboa A. firouzi (Mammalia: Rodentia: balance between two opposing demands for Dipodidae). Mammalia 75: 75: 31–34 increasing fitness: maximizing energy intake Abramsky Z., Rosenzweig M.L., Belmaker J. and avoiding the risk of predation (Price 1984). and Bar A. 2004. The impact of longterm continuous risk of predation on two species Discussion of gerbils. Canadian Journal of Zoology 82(3):464-474. The adaptational value of selecting barren areas Berger P.J. 1991. Pregnancy incentives, for activation times most likely results from the predation constraints and habitat shifts: possibility for better and faster entering to the experimental and field evidence for wild burrows a bihaviour that can be regarded to bighorn sheep. Animal Behaviour 41: 61–77. somewhat an antipredation adaptation. These Butynski T. M. 1984. Nocturnal ecology of the finding are in accordance with the previous spring hare, Pedetes capensis, in Botswana. studies (Hemami et al 2011, Lockard and African Journal of Ecology 22:7-22. Owings 1974, Kaufman and Kaufman 1982, Cresswell W.J., Harris S. 1988. Foraging Kotler et al. 1993). behaviour and home-range utilization in a Previous studies about the other nocturnal suburban badger (Meles meles) population. mammalian species indicated that such animals Mammalian Review 18: 37–49. reacted to an increase in the intensity of Gilbert BS and Boutin S. 1991. Effect of nocturnal illumination by reducing the use of moonlight on winter activity of snowshoe open space, by restricting foraging activity, hares. Arctic Alpine Research 23: 61–65. movements or the duration of the period activity Kaufman, D.W. and G.A. Kaufman. 1982. or by switching the activity to dark periods Effect of moonlight on activity and (Butynski 1984, Gilbert and Boutin 1991, Wolfe icrohabitat use by Ord’s kangaroo rat and Summerlin 1989). But our findings about (Dipodomys ordii). Journal of Mammalogy the Jerboas showed a reverse trend since 63: 309-312. individuals had been shifted to more barren Kotler, B.P. Brown J.S. 1988. Environmental areas with an increase in the moon light intensity heterogeneity and the coexistence of desert during full moon status, in spite of their lower rodents. Annual Review of Ecology, overall activity outside the burrows (Hemami et Evolution and Systematics 19:281-307. al. 2011). Kotler B.P., Brown J.S., Hasson O. 1991. Factor affecting Gerbils' foraging behavior 36 | Journal of Wildlife and Biodiversity 1(1): 33-36 (2017) and rates of owl predation.
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