The potential for vocal signatures in the calls of young hoary bats (Lasiurus cinereus)

1988 ◽  
Vol 66 (9) ◽  
pp. 1982-1985 ◽  
Author(s):  
Catherine E. Koehler ◽  
Robert M. R. Barclay
Keyword(s):  
Adult Female ◽  
High Speed ◽  
Auditory Discrimination ◽  
Myotis Lucifugus ◽  
Recording Equipment ◽  
Colonial Species ◽  
Lasiurus Cinereus ◽  
Minimum Frequency ◽  
Delta Marsh ◽  
Vocal Signatures

We examined calls produced by the solitary bat Lasiurus cinereus during mother–young interactions and considered the potential for vocal signatures in the calls of the young. Families of bats were observed in the field at Delta Marsh, Manitoba, and vocalizations were recorded using high-speed ultrasonic recording equipment. Adult female bats and young vocalize primarily during reunions. Variation in duration and maximum and minimum frequency of the calls of young was calculated. The degree of call variation within L. cinereus family units was relatively high and calls produced by different young could not be differentiated. These observations suggest that a vocal signature, which is present in some colonial species of bats such as Myotis lucifugus and which allows auditory discrimination between calling young, is less likely to occur in L. cinereus.

Host behaviour, age and sex correlate with ectoparasite prevalence and intensity in a colonial mammal, the little brown bat

Behaviour ◽  
2014 ◽  
Vol 152 (1) ◽  
pp. 83-105 ◽  
Author(s):  
Quinn M.R. Webber ◽  
Liam P. McGuire ◽  
Steven B. Smith ◽  
Craig K.R. Willis
Keyword(s):  
Pathogen Transmission ◽  
Myotis Lucifugus ◽  
Physical Contact ◽  
Wildlife Diseases ◽  
Colonial Species ◽  
Host Seeking ◽  
Host Sex ◽  
Little Brown Bat ◽  
Host Behaviour ◽  
Age And Sex

The influence of behaviour on host-parasite dynamics has theoretical support but few empirical studies have examined this influence for wild-captured hosts, especially in colonial species, which are thought to face generally high risk of exposure. Behavioural tendencies of hosts in novel environments could mediate host exposure. We tested the hypothesis that behavioural tendencies of hosts, and host sex and age, correlate with prevalence and intensity of ectoparasites in a gregarious mammal, the little brown bat (Myotis lucifugus). We also tested whether relationships between host behaviour and parasite prevalence and intensity would vary between taxa of ectoparasites which differ in host-seeking behaviour. We predicted that individual hosts displaying active and explorative behaviours would have higher prevalence and intensity of parasites that depend on physical contact among hosts for transmission (mites) but that host behaviour would not influence prevalence and intensity of mobile ectoparasites with active host-seeking behaviour (fleas). We recorded behavioural responses of wild-captured bats in a novel-environment test and then sampled each individual for ectoparasites. After accounting for age and sex we found mixed support for our hypotheses in some but not all demographics. More active adult and young of the year (YOY) males were more likely to host mites while more active adult and YOY females were less likely to host fleas. Our results highlight possible differences in the influence of host and parasite behaviour on parasite transmission dynamics for colonial compared to non-colonial species and have conservation implications for understanding pathogen transmission in bat white-nose syndrome and other wildlife diseases.

Seasonal dynamics of the bat stomach worm, Longibucca lasiura (Nematoda: Rhabditoidea), in Alberta

1994 ◽  
Vol 72 (5) ◽  
pp. 791-794 ◽  
Author(s):  
Lena N. Measures
Keyword(s):  
Boreal Forest ◽  
Sample Size ◽  
Seasonal Dynamics ◽  
Eptesicus Fuscus ◽  
Myotis Lucifugus ◽  
Lasiurus Cinereus ◽  
Mean Intensity ◽  
Ecological Zones ◽  
Aspen Parkland ◽  
Lasionycteris Noctivagans

One hundred and sixty-nine bats belonging to 6 different species and collected from 4 ecological zones (aspen parkland, boreal forest, grassland, and montane) in Alberta, Canada, during 1988 and 1989 were examined for helminths. Forty bats were infected with the stomach nematode Longibucca lasiura McIntosh and Chitwood, 1934. Sample size, prevalence, and mean intensity (with range in parentheses) of L. lasiura for the 6 species of bat were as follows: Myotis lucifugus, N = 130, 27%, 39 (1–121); Myotis ciliolabrum, N = 10, 10%, 1; Eptesicus fuscus, N = 6, 33%, 12 (2–22); Lasionycteris noctivagans, N = 2, 100%, 22 (5–39). Myotis evotis (N = 9) and Lasiurus cinereus (N = 3) were not infected. Longibucca lasiura was found in bats from all ecological zones except the boreal forest. This parasite was found in bats active during summer (June to August) and in hibernating M. lucifugus collected in September and April.

In‐Flight Far‐Field Measurement of Helicopter Impulsive Noise

1976 ◽  
Vol 21 (4) ◽  
pp. 2-16
Author(s):  
F. H. Schmitz ◽  
D. A. Boxwell
Keyword(s):  
High Speed ◽  
Impulsive Noise ◽  
Operating Conditions ◽  
Tape Recording ◽  
Far Field ◽  
Recording Equipment ◽  
Radiation Characteristics ◽  
Acoustic Data ◽  
Noise Radiation ◽  
The Subject

A new and highly successful method of collecting far‐field acoustic data radiated by helicopters in forward flight has been developed, utilizing a quiet aircraft flying in formation ahead of the subject helicopter. The lead aircraft, flown as an acoustic probe, was equipped with tape‐recording equipment and an external microphone. Spatial orientation of the helicopter with respect to the monitoring aircraft was achieved through visual flight reference. Far‐field acoustic data defining the impulsive noise radiation characteristics of the UH‐1H helicopter during high‐speed flight and partial ‐power descents have been gathered with this technique. Three distinct types of impulsive waveforms have been identified and correlated with helicopter steady operating conditions.

Bats of Kootenay, Glacier, and Mount Revelstoke national parks in Canada: identification by echolocation calls, distribution, and biology

1983 ◽  
Vol 61 (11) ◽  
pp. 2503-2508 ◽  
Author(s):  
M. B. Fenton ◽  
H. G. Merriam ◽  
G. L. Holroyd
Keyword(s):  
British Columbia ◽  
National Parks ◽  
National Park ◽  
Myotis Lucifugus ◽  
Glacier National Park ◽  
Lasiurus Cinereus ◽  
Echolocation Calls ◽  
Bat Activity ◽  
Lasionycteris Noctivagans ◽  
The Town

We studied the behaviour, echolocation calls, and distribution of bats in Kootenay, Glacier, and Mount Revelstoke national parks in British Columbia, Canada. Presented here are keys for identification of nine species of bats by their echolocation calls as rendered by two different bat-detecting systems. The species involved include Myotis lucifugus, M. evotis, M. volans, M. septentrionalis, M. californicus, Lasionycteris noctivagans, Eptesicus fuscus, Lasiurus cinereus, and L. borealis. The distribution of these species within the three parks was assessed by capturing bats in traps and mist nets and by monitoring of their echolocation calls. Most of the species exploited concentrations of insects around spotlights, providing convenient foci of activity for assessing distribution. Although most species of Myotis were commonly encountered away from the lights, Lasiurus cinereus in Kootenay National Park was only regularly encountered feeding on insects at lights. This species was not detected in Glacier National Park, and although we regularly encountered it in the town of Revelstoke, it was rarely encountered in Mount Revelstoke National Park. Another focus of bat activity was small pools in cedar forest in Mount Revelstoke National Park. This involved high levels of Myotis spp. activity at dusk as the bats came to the pools to drink.

scholarly journals Polychlorinated biphenyls (PCBs): impact on bat activity and foraging behaviour along the upper Hudson River, New York

2016 ◽  
Vol 94 (3) ◽  
pp. 217-223
Author(s):  
L.A. Hooton ◽  
Y.A. Dzal ◽  
N. Veselka ◽  
M.B. Fenton
Keyword(s):  
New York ◽  
Polychlorinated Biphenyls ◽  
Foraging Behaviour ◽  
Hudson River ◽  
Control Site ◽  
Myotis Lucifugus ◽  
Lasiurus Cinereus ◽  
Insect Abundance ◽  
Insect Prey ◽  
Bat Activity

Sediments of the upper Hudson River, New York, USA, contain polychlorinated biphenyls (PCBs). Consequently, elevated levels of PCBs have been found in the tissues of bats and their insect prey along this region. However, it is not clear whether bat activity and foraging behaviour have been affected. To assess possible effects of PCBs on bat activity and foraging behaviour, we measured the activity of little brown bats (Myotis lucifugus (LeConte, 1831)) and hoary bats (Lasiurus cinereus (Palisot de Beauvois, 1796)) along the upper Hudson River, as well as abundance of insect prey at the same locations. We also measured foraging duration and distances travelled by radio-tagged M. lucifugus. We found that bat activity and insect abundance did not differ with PCB concentration. We did, however, find that foraging behaviour along the Hudson River differed from a control site. Specifically, M. lucifugus foraging along PCB-contaminated areas of the Hudson River travelled shorter distances from their roosts and spent less time foraging than bats at an uncontaminated site. Our results show that while bats roost and forage in areas historically exposed to PCBs, this exposure has not adversely affected bat activity, foraging behaviour, or abundance of insect prey.

scholarly journals First records of the Northern Myotis (Myotis septentrionalis) from Labrador and summer distribution records and biology of Little Brown Bats (Myotis lucifugus) in southern Labrador

2013 ◽  
Vol 127 (3) ◽  
pp. 266 ◽  
Author(s):  
Hugh G. Broders ◽  
Lynne E. Burns ◽  
Sara C. McCarthy
Keyword(s):  
Adult Female ◽  
Adult Male ◽  
Newfoundland And Labrador ◽  
Word Of Mouth ◽  
Myotis Lucifugus ◽  
Regional Survey ◽  
Myotis Septentrionalis ◽  
Little Brown Bat ◽  
Summer Distribution ◽  
Little Brown Bats

We conducted the first regional survey of bats in Labrador (Newfoundland and Labrador) to provide information on the distribution and biology of bats in this region. Our approach was to locate maternity roosts of Myotis lucifugus (Little Brown Bat) via word of mouth and then capture Little Brown Bats as they emerged from their day-roosts. We also surveyed for free-flying forest-dwelling bats using mist nets and a harp trap along forested trails and roads in southern Labrador. We captured 355 M. lucifugus at nine maternity roosts and one non-reproductive adult female M. lucifugus at a forested site. We captured two adult male Myotis septentrionalis (Northern Myotis) at two of the three forested sites (Gull Island and Grand Lake Road). These are the first confirmed records of this species from Labrador. Maternity roosts of M. lucifugus often had several hundred individuals. The proportion of female M. lucifugus captured at a roost that were either pregnant or lactating ranged from 35% to 96%; the estimated average date of parturition in 2012 was 10 July.

A High Speed Chronograph and its Application to the Time of Flight of Cosmic Rays

1951 ◽  
Vol 4 (4) ◽  
pp. 526
Author(s):  
VC Officer
Keyword(s):  
Cosmic Rays ◽  
High Speed ◽  
Time Lag ◽  
Time Of Flight ◽  
Cosmic Ray ◽  
Time Base ◽  
Theoretical Expectation ◽  
Delay Lines ◽  
Air Showers ◽  
Recording Equipment

A high speed chronograph using a 20 turn spiral time base of 1 μsec. duration per turn 1s described, together with its video amplifiers, delay lines, radial deflection circuits, and recording equipment. The time of flight of cosmic ray mesons over a range of 5.45 m. has been detected using ordinary Geiger counters. and found to agree with the velocity of light within the accuracy of the experiment. A time lag of 2 x 10-8 sec. between the firing of a tray of counters shielded with 10 cm. of lead and the firing of a similar unshielded tray by extensive air showers has been accounted for. and the results shown to be consistent with the theoretical expectation that most of the shower particles arrive at the trays within a time <10-9 sec.

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