| sensory ecology of predator-prey interactions: responses of the an2 interneuron in the field cricket, teleogryllus oceanicus to the echolocation calls of sympatric bats. | we observed the responses of the an2 interneuron in the pacific field cricket, teleogryllus oceanicus, a cell implicated in eliciting avoidance flight away from bats, to acoustic stimuli representing the echolocation calls of bats as well as field recordings of search and gleaning attack calls of six species of insectivorous sympatric bats (west australia, australia: tadarida australis, chalinolobus goudii, nyctophilus geoffroyi; queensland, australia: vespadelus pumilus, myotis adversus; kaua'i ... | 2005 | 15886992 |
| post-wildfire physiological ecology of an australian microbat. | historical patterns of wildfires are being altered as a result of changing climate and therefore are becoming an increasingly pressing global issue. how small mammals deal physiologically with changes in landscape and food availability due to fire remains largely unknown, although recent studies on small heterothermic terrestrial mammals have shown an increase in post-fire torpor use to reduce energy and foraging requirements. however, data on the behavioural and physiological responses of bats ... | 2016 | 27245066 |
| torpor and activity in a free-ranging tropical bat: implications for the distribution and conservation of mammals? | bats are most diverse in the tropics, but there are no quantitative data on torpor use for energy conservation by any tropical bat in the wild. we examined the thermal biology, activity patterns and torpor use of two tree-roosting long-eared bats (nyctophilus geoffroyi, 7.8 g) in tropical northern australia in winter using temperature telemetry. bats commenced activity about 20 min after sunset, ended activity about 2.5 h before sunrise and entered torpor everyday in the early morning even when ... | 2011 | 21416134 |
| gleaning bat echolocation calls do not elicit antipredator behaviour in the pacific field cricket, teleogryllus oceanicus (orthoptera: gryllidae). | bats that glean prey (capture them from surfaces) produce relatively inconspicuous echolocation calls compared to aerially foraging bats and could therefore be difficult predators to detect, even for insects with ultrasound sensitive ears. in the cricket teleogryllus oceanicus, an auditory interneuron (an2) responsive to ultrasound is known to elicit turning behaviour, but only when the cricket is in flight. turning would not save a cricket from a gleaning bat so we tested the hypothesis that an ... | 2009 | 19529946 |
| timing of the daily temperature cycle affects the critical arousal temperature and energy expenditure of lesser long-eared bats. | daily patterns of body temperature (t(b)) and energy expenditure in heterothermic endotherms are affected by changes in ambient temperature (t(a)) and selection of suitable microclimates, yet most laboratory studies employ constant t(a) to measure metabolic rates. in particular, exposure to a daily temperature cycle, even within rest shelters, may be important in timing of torpor and arousal and determining resting energy costs in wild animals. we tested how captive bats (nyctophilus geoffroyi; ... | 2008 | 19043059 |
| hibernation by tree-roosting bats. | in summer, long-eared bats (nyctophilus spp.) roost under bark and in tree cavities, where they appear to benefit from diurnal heating of roosts. in contrast, hibernation is thought to require a cool stable temperature, suggesting they should prefer thermally insulated tree cavities during winter. to test this prediction, we quantified the winter thermoregulatory physiology and ecology of hibernating tree-roosting bats, nyctophilus geoffroyi and n. gouldi in the field. surprisingly, bats in wint ... | 2008 | 18210129 |
| thermal physiology of pregnant and lactating female and male long-eared bats, nyctophilus geoffroyi and n. gouldi. | during roosting in summer, reproductive female bats appear to use torpor less frequently and at higher body temperatures (tb) than male bats, ostensibly to maximise offspring growth. to test whether field observations result from differences in thermal physiology or behavioural thermoregulation during roosting, we measured the thermoregulatory response and energetics of captive pregnant and lactating female and male long-eared bats (nyctophilus geoffroyi 8.9 g and n. gouldi 11.5 g) during overni ... | 2006 | 16331479 |
| natural use of heterothermy by a small, tree-roosting bat during summer. | little is known about the use of heterothermy by wild bats during summer, especially for tree-roosting species. because thermal conditions within tree roosts can fluctuate widely with ambient temperature, which affects thermoregulatory energy expenditure during diurnal roosting, we measured skin temperatures of free-ranging male nyctophilus geoffroyi (8 g) to quantify the relation between summer torpor use and roost thermal conditions. bats roosted under bark on the northern (sunny) side of tree ... | 2006 | 14988802 |
| the effect of alterations in activity and body temperature on the pulmonary surfactant system in the lesser long-eared bat nyctophilus geoffroyi. | pulmonary surfactant is a mixture of phospholipids, neutral lipids and proteins that controls the surface tension of the fluid lining the lung. it is critical for lung stability and function. the amount and composition of surfactant are influenced by physiological variables such as metabolic rate, body temperature and ventilation. we investigated the plasticity of the pulmonary surfactant system in the microchiropteran bat nyctophilus geoffroyi throughout a natural 24 h cycle. bats were housed a ... | 2000 | 10903157 |
| torpor, thermal biology, and energetics in australian long-eared bats (nyctophilus). | previous studies have suggested that australian long-eared bats (nyctophilus) differ from northern-hemisphere bats with respect to their thermal physiology and patterns of torpor. to determine whether this is a general trait of australian bats, we characterised the temporal organisation of torpor and quantified metabolic rates and body temperatures of normothermic and torpid australian bats (nyctophilus geoffroyi, 7 g and n. gouldi, 10 g) over a range of air temperatures and in different seasons ... | 2000 | 10791575 |
| first report of trypanosoma dionisii (trypanosomatidae) identified in australia. | trypanosomes are blood-borne parasites that can infect a variety of different vertebrates, including animals and humans. this study aims to broaden scientific knowledge about the presence and biodiversity of trypanosomes in australian bats. molecular and morphological analysis was performed on 86 blood samples collected from seven different species of microbats in western australia. phylogenetic analysis on 18s rdna and glycosomal glyceraldehyde phosphate dehydrogenase (ggapdh) sequences identif ... | 2020 | 32981530 |