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4 Acta Chiropterologica

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Evaluation of morphological indices and total body electrical conductivity to assess body composition in big brown bats

100%

Pearce R. D. , O'Shea T. J. , Wunder B. A.

tom 10

nr 1

Bat researchers have used both morphological indices and total body electric conductivity (TOBEC) as proxies for body condition in a variety of studies, but have typically not validated these indices against direct measurement of body composition. We quantified body composition (total carcass lipids) to determine if morphological indices were useful predictors of body condition in big brown bats (Eptesicus fuscus). We also evaluated body composition indirectly by TOBEC using EM-SCAN® technology. The most important predictors of body composition in multiple regression analysis were body mass-to-forearm ratio (partial r2 = 0.82, P < 0.001) followed by TOBEC measurement (partial r2 = 0.08, P < 0.001) and to a minor extent head length (partial r2 = 0.02, P < 0.05). Morphological condition indices alone may be adequate for some studies because of lower cost and effort. Marking bats with passive integrated transponder (PIT) tags affected TOBEC measurements.

Microsatellite genotypes of big brown bats (Eptesicus fuscus: Vespertilionidae, Chiroptera) obtained from their feces

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Vege S. , McCracken G. F.

tom 03

nr 2

Big brown bats (Eptesicus fuscus) were genotyped from their feces using three sets of microsatellite primers. Genotypes obtained from bat fecal DNA consistently matched the genotypes obtained from DNA extracted from wing membrane tissue of the same bat. Identical microsatellite genotypes were also obtained from multiple fecal DNA samples from the same bat. DNA obtained from feces using a modification to the DNeasy tissue kit (Qiagen) amplified from 92% (83/90) of the samples upon the first PCR. The use of fecal DNA provides opportunities for addressing ecological and behavioral questions for animals that are difficult to capture, rare, or endangered.

A comparison of conventional capture versus PIT reader techniques for estimating survival and capture probabilities of big brown bats (Eptesicus fuscus)

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Ellison L. E. , O'shea T. J. , Neubaum D. J. , Neubaum M. A. , Pearce R. D. , Bowen R. A.

Acta Chiropterologica

2007

tom 09

nr 1

We compared conventional capture (primarily mist nets and harp traps) and passive integrated transponder (PIT) tagging techniques for estimating capture and survival probabilities of big brown bats (Eptesicus fuscus) roosting in buildings in Fort Collins, Colorado. A total of 987 female adult and juvenile bats were captured and marked by subdermal injection of PIT tags during the summers of 2001–2005 at five maternity colonies in buildings. Openings to roosts were equipped with PIT hoop-style readers, and exit and entry of bats were passively monitored on a daily basis throughout the summers of 2002–2005. PIT readers ‘recaptured’ adult and juvenile females more often than conventional capture events at each roost. Estimates of annual capture probabilities for all five colonies were on average twice as high when estimated from PIT reader data ( p̂ = 0.93–1.00) than when derived from conventional techniques ( p̂ = 0.26–0.66), and as a consequence annual survival estimates were more precisely estimated when using PIT reader encounters. Short-term, daily capture estimates were also higher using PIT readers than conventional captures. We discuss the advantages and limitations of using PIT tags and passive encounters with hoop readers vs. conventional capture techniques for estimating these vital parameters in big brown bats.

Winter feeding by bats in Missouri

80%

Dunbar M. B. , Whitaker, Jr. J. O. , Robbins L. W.

Acta Chiropterologica

2007

tom 09

nr 1