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  • 1
    In: Acta Chiropterologica, December 2017, Vol.19(2), pp.347-355
    Description: Noack's round-leaf bat Hipposideros cf. ruber is widely distributed in sub-Saharan Africa. Here, we present some aspects of its ecology from two caves in central Ghana. Our main objective was to assess the nightly and annual flight activity and to examine the influences of ambient temperature on flight activity. We tested the hypothesis that flight activity of the species is concentrated at certain periods of the night and the year using mist-netting data from 2,712 captured bats. We found no evidence for annual fluctuations in flight activity, probably due to no distinct seasonal limitation of food resources, no migration, and the lack of extreme environmental conditions in the study area. Our hypothesis of concentrated nightly flight activity was confirmed for one cave but not for the other. Flight activity was concentrated early in the night (20:00, 21:00 and 22:00 hours) at one cave, possibly to take advantage of locally available early active prey insects, while it was uniformly distributed throughout the night at the other. Lastly, we found a reduction in the flight activity of H. cf. ruber when there was a distinct drop in temperature over the night. We therefore suggest the reduction in flight activity may result from the direct effects of temperature on prey abundance as the bats responded by reducing activity to avoid excessive prey search costs.
    Keywords: Flight Activity ; Hipposideros Cf. Ruber ; Caves ; Insects ; Temperature ; Prey
    ISSN: 1508-1109
    E-ISSN: 17335329
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  • 2
    In: Acta Chiropterologica, June 2016, Vol.18(1), pp.239-247
    Description: Thirteen individuals of Noack's round-leaf bat, Hipposideros aff. ruber, were radio-tracked for 38 nights in an agricultural landscape in Kwamang, Ashanti Region, Ghana. Local convex hulls were used to estimate home range sizes of the bats. Based on 1,192 fixes, the mean ( SD) home range size was 36 ha 35 ha. Individual home range size ranged from six to 95 ha and frequently overlapped among individuals. The foraging area covered 50% of the home range while the core area formed 2%. The mean maximum foraging distance was 1.1 km, with individual distances up to 2.6 km, suggesting Hipposideros aff. ruber is capable of covering relatively long distances. Male bats returned to the cave more often than females during the night. Although the cave was the main roost, each bat also had individual night roosts on trees.
    Keywords: Core Area ; Maximum Foraging Distance ; Radio - Tracking ; Local Convex Hull ; Foraging Area
    ISSN: 1508-1109
    E-ISSN: 17335329
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