| host specificity in bat ectoparasites: a natural experiment. | we undertook a field study to determine patterns of specialisation of ectoparasites in cave-dwelling bats in sri lanka. the hypothesis tested was that strict host specificity (monoxeny) could evolve through the development of differential species preferences through association with the different host groups. three species of cave-dwelling bats were chosen to represent a wide range of host-parasite associations (monoxeny to polyxeny), and both sympatric and allopatric roosting assemblages. of th ... | 2009 | 19232350 |
| recent loss of vitamin c biosynthesis ability in bats. | the traditional assumption that bats cannot synthesize vitamin c (vc) has been challenged recently. we have previously shown that two old world bat species (rousettus leschenaultii and hipposideros armiger) have functional l-gulonolactone oxidase (gulo), an enzyme that catalyzes the last step of vc biosynthesis de novo. given the uncertainties surrounding when and how bats lost gulo function, exploration of gene evolutionary patterns is needed. we therefore sequenced gulo genes from 16 bat speci ... | 2011 | 22069493 |
| histochemical analysis of mucosubstances in thyroid of bat hipposideros speoris: correlation of sialo- and neutral mucins with functional state of thyroid follicles. | | 2008 | 4115334 |
| natural twilight phase-response curves for the cave-dwelling bat, hipposideros speoris. | phase-response curves (prcs) for the circadian rhythm of flight activity of the microchiropteran bat (hipposideros speoris) were determined in a cave, employing discrete natural dawn and dusk twilight pulses. these prcs are reported for the first time for any circadian system and they are unlike other prcs constructed for nocturnal mammals. dawn and dusk twilight pulses evoked advance and delay phase shifts, respectively. advance phase shifts were followed by 3 to 4 advancing transients and a su ... | 2005 | 16298767 |
| non-parametric entrainment by natural twilight in the microchiropteran bat, hipposideros speoris inside a cave. | the study aimed to determine the influence of repeated natural dawn and dusk twilight pulses in entraining the circadian flight activity rhythm of the microchiropteran bat, hipposideros speoris, free-running in constant darkness in a natural cave. the bats were exposed to repeated dawn or dusk twilight pulses at eight circadian phases. all bats exposed to dawn twilight pulses were entrained by advancing transients, and the stable entrainment was reached when the onset of activity occurred about ... | 2005 | 16147895 |
| ontogenesis of tonotopy in inferior colliculus of a hipposiderid bat reveals postnatal shift in frequency-place code. | the postnatal development of midbrain tonotopy was investigated in the inferior colliculus (ic) of the south indian cf-fm bat hipposideros speoris. the developmental progress of the three-dimensional frequency representation was determined by systematic stereotaxic recordings of multiunit clusters from the 1st up to the 7th postnatal week. additional developmental measures included the tuning characteristics of single units (figs. 3f; 4f; 5f), the analysis of the vocalised pulse repertoire (figs ... | 1989 | 2810149 |
| light flashes of different durations (0.063-3.33 msec) phase shift the circadian flight activity of a bat. | the phase-response curve (prc) for the circadian rhythm in the flight activity of a cave-dwelling bat, hipposideros speoris, constructed with 0.063-msec light flashes, reported here is the first of its kind for any circadian system and is unlike any other phase-response curves constructed for other nocturnal animals. the phase responding with maximal advances (90 degrees) and the phase responding with maximal delays (0 degree) of this prc were exposed to light flashes of systematically varying d ... | 1985 | 3973551 |
| bright light flashes of 0.5 milliseconds reset the circadian clock of a microchiropteran bat. | a phase response curve for the circadian rhythm in the flight activity of the cave dwelling bat, hipposideros speoris, constructed with 0.5-msec light flashes of very high intensity reported here is the first of its kind for any mammalian system and is unlike any other phase response curves constructed for other nocturnal mammals. | 1984 | 6736901 |
| spatial organization of roosting in the insectivorous tropical bat hipposideros speoris. | the roost organization of the insectivorous bat hipposideros speoris was studied both in the field and in conditions of captivity. all the individuals roost singly and maintain a marked fidelity to their roost sites for long periods. the males use their urine as an olfactory cue in relocating their respective roost sites but the females appear to relocate their roost sites relatively by recognizing the position of neighbouring conspecifics. in captivity all the individuals prefer to roost in dar ... | 1984 | 24896509 |
| seasonal changes in the precision of the circadian clock of a tropical bat under natural photoperiod. | the emergence and returning activity patterns of a colony of microchiropteran bats hipposideros speoris, under natural light-dark cycles keep pace with the timings of sunset and sunrise respectively. the onset of emergence flight occurred at different environmental twilight intensities which vary over the seasons. the seasonal changes of phase relationship between the onset and end of flight activity to sunset and sunrise respectively are discussed. as a result ψ-onset, ψ-end, and ψ-midpoint all ... | 1984 | 28311062 |