Volume 02 - 2005

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Author: search.filters.author.Yapa, W.B.

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    Inflight and Outflight Activity Patterns of Five Species of Cave Dwelling Bats in Sri Lanka
    (Journal of Science of the University of Kelaniya Sri Lanka, 2005) Yapa, W.B.; Ratnasooriya, W.D.; Costa, H.H.; Rubsamen, R.
    Wavulgalge, a natural cave situated in Nikapitiya, Koslanda (6?40' - 6?45N': 80?00'-81?05'E), in the eastern region of Sri Lanka is sympatrically inhabited by five species of bats. i.e., four microchiropterans: Rhinolophus rouxii (10000 ? 12000 individuals). Hipposideros lankadiva (1500 - 2000). Hipposideros speoris (200 - 300).Mmiopterus schreibersii (700 - 1000) and one megachiropteran, Rousettus leschenaulti (5000 - 7000). Field studies were carried out from May 1988 to November 1989 in this cave to study the factors influencing the timing of inflight and outflight activity of each bat species. Throughout the study period the outflight commenced ca. 10 minutes before the sunset (light intensity 150-350 lux) and the bats retuned the following morning. ca. 10 minutes before the sun rise (light intensity 100 - 200 lux). The light intensity threshold of different species of bats appeared to be different from one another . During the outflight. R. rouxii and M schrribersii were the first bats to emerge, followed by hipposiderids and the fruit bat, R. leschenaulti. During the inflight in the morning, complete reverse sequence was observed. Results show that the light intensity is the most crucial environmental factor that regulates the time of outward and inward flight activities of the bat species of this cave. In contrast, no relationship was evident between the outward and inward flight activities of the bats and the other environmental factors monitored namely temperature, humidity, rainfall and the velocity of the wind.
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    Haematological parameters of three species of wild caught microchiropteran bats, Miniopterus schreibersii, Taphozous melanopogon and Hipposideros lankadiva in Sri Lanka
    (Journal of Science of the University of Kelaniya Sri Lanka, 2005) Ratnasooriya, W.D.; Udagama-Randeniya, P.V.; Yapa, W.B.; Digana, P.M.C.B.; Dharmasiri, M.G.
    This study,for the first time in South Asia, examines haematological parameters of thre species of wild caught Sri Lankan microchiropteran bats, belonging to three different families having different global zoogeographical distributions; Miniopterus schreibersii (Vespertilionidae: n=12), Taphozous melanopogon (Emballonuridae; n=19) and Hipposideros lankadiva (Hipposiderosidae; n=15). Blood samples were obtained from the median vein and the total white blood cell (WBC) count, red blood cell (RBC) count, packed cell volume (PCV), haemoglobin content(Hb), mean corpuscular volume (MCV) and mean corpuscular haemoglobin content (MCHC) were determined using standard haematological techniques. lnterspecies differences existed in some of the parameters monitored, i.e. PCV, MCV, WBC and RBC counts. % of neutrophils and lymphocytes. On the other hand, a gender discrepancy was recorded for T.melanopgon with respect to neutrophils and lymphocytes, and for M. schreibersii with respect to the total WBC count. The highest WBC count and the lowest PCV and MCV were found in M. schreibersii. T.melanopgon registered the highest percentage of lymphocytes and the lowest percentage of neutrophils, while H. lankadiva possessed the highest MCV. Haematological values were recorded also for a single lactating T.melanopogon.