No Sign of Infection in Free-Ranging Myotis austroriparius Hibernating in the Presence of Pseudogymnoascus destructans in Alabama

Johnson, Joseph S.; Sharp, Nicholas W.; Monarchino, Maria N.; Lilley, Thomas M.; Edelman, Andrew J.

doi:10.1656/058.020.0102

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…The skin of 99 hibernating M. austroriparius was examined for both the presence P. destructans DNA on it, and the UV-florescent skin lesions characteristic of Pd infections. Although 77% of the bats tested had Pd DNA on their skin, none of them had Pd skin lesions [40]. These findings indicate that although M. austroriparius was exposed to propagules (spores) of Pd, this fungus did not invade the skin of this bat species during hibernation, thus WNS does not develop.…”

Section: The Susceptibility To Pseudogymnoascus Destructansmentioning

confidence: 84%

The Physiological Ecology of White-Nose Syndrome (WNS) in North American Bats

Frank¹

2022

Bats - Disease-Prone but Beneficial

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White-nose Syndrome (WNS) is an emergent mycosis in North America that is caused by a severe cutaneous infection with the fungus Pseudogymnoascus destructans (Pd) during hibernation. Pseudogymnoascus destructans (Pd) was first observed in North America at a single site during the winter of 2006–2007 and has since spread to 39 U.S. States and 7 Canadian provinces. This fungus was introduced to North America from Europe, where it is endemic. WNS has thus far been observed to occur only in hibernating bats and has caused the populations of 4 North American bat species to decline by more than 84% within 7 years. Field studies have revealed that 4 other North American bat species are not afflicted with WNS when hibernating in areas where Pd occurs. The physiological and biochemical adaptations that permit some bat species to resist Pd infections are starting to be elucidated but are still poorly understood. A total of 47 different bat species are found in North America, about half of which hibernate during the winter. The potential future effects of WNS on 13 of these hibernating bat species remains to be determined.

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Section: The Susceptibility To Pseudogymnoascus Destructansmentioning

confidence: 84%

The Physiological Ecology of White-Nose Syndrome (WNS) in North American Bats

Frank¹

2022

Bats - Disease-Prone but Beneficial

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“…Since evidence of activity away from roosts was not observed by Sirajuddin (2018) in bats using thermally stable hibernacula under similar climatic conditions to our own, intermittent winter feeding by tri-colored bats at SRS may be a function of both a mild climate and use of thermally unstable roosts. Big brown bats (Eptesicus fuscus), Rafinesque's big-eared bats (Corynorhinus rafinesquii), and southeastern myotis (Myotis austroriparius) with high winter activity levels appear less susceptible to WNS than bats with naturally low winter activity levels (Johnson et al 2012(Johnson et al , 2021Reynolds et al 2017). During torpor bats experience reduced immunocompentence (Field et al 2018) and long TBD may allow Pd to extensively colonize cutaneaous tissues with little host resistence or immune response.…”

Section: Discussionmentioning

confidence: 99%

Roost thermal stability influences winter torpor patterns in a threatened bat species

Newman

Loeb

Jachowski

2023

Preprint

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Some hibernating bats in thermally stable, subterranean roosts have experienced precipitous declines from white-nose syndrome (WNS). However, some WNS-affected species also use thermally unstable roosts during winter which may impact their torpor patterns and WNS susceptibility. From November to March 2017-2019, we used temperature-sensitive transmitters to document winter torpor patterns of tri-colored bats (Perimyotis subflavus) using thermally unstable roosts in the upper Coastal Plain of South Carolina. Daily mean roost temperature fluctuation was 4.8 ± 2°C SD in bridges and 4.0 ± 1.9°C in accessible cavities with maximum fluctuations of 13.8°C and 10.5°C, respectively. Mean torpor bout duration was 2.7 ± 2.8 days and was negatively related to ambient temperature and positively related to precipitation. Bats maintained non-random arousal patterns focused near dusk and were active on 33.6% of tracked days. Fifty-one percent of arousals contained passive rewarming. Normothermic bout duration, general activity, and activity away from the roost were positively related to ambient temperature, and activity away from the roost was negatively related to barometric pressure. Our results suggest ambient weather conditions influence winter torpor patterns of tri-colored bats using thermally unstable roosts. Short torpor bout durations and potential nighttime foraging during winter by tri-colored bats in thermally unstable roosts contrasts with behaviors of tri-colored bats in thermally stable roosts. Therefore, tri-colored bat using thermally unstable roosts may be less susceptible to WNS. These results highlight the importance of understanding the effect of roost thermal stability on winter torpor patterns and the physiological flexibility of broadly distributed hibernating species.

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Thermally unstable roosts influence winter torpor patterns in a threatened bat species

Newman,

Loeb,

Jachowski

2024

Conservation Physiology

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Many hibernating bats in thermally stable, subterranean roosts have experienced precipitous declines from white-nose syndrome (WNS). However, some WNS-affected species also use thermally unstable roosts during winter that may impact their torpor patterns and WNS susceptibility. From November to March 2017–19, we used temperature-sensitive transmitters to document winter torpor patterns of tricolored bats (Perimyotis subflavus) using thermally unstable roosts in the upper Coastal Plain of South Carolina. Daily mean roost temperature was 12.9 ± 4.9°C SD in bridges and 11.0 ± 4.6°C in accessible cavities with daily fluctuations of 4.8 ± 2°C in bridges and 4.0 ± 1.9°C in accessible cavities and maximum fluctuations of 13.8 and 10.5°C, respectively. Mean torpor bout duration was 2.7 ± 2.8 days and was negatively related to ambient temperature and positively related to precipitation. Bats maintained non-random arousal patterns focused near dusk and were active on 33.6% of tracked days. Fifty-one percent of arousals contained passive rewarming. Normothermic bout duration, general activity and activity away from the roost were positively related to ambient temperature, and activity away from the roost was negatively related to barometric pressure. Our results suggest ambient weather conditions influence winter torpor patterns of tricolored bats using thermally unstable roosts. Short torpor bout durations and potential nighttime foraging during winter by tricolored bats in thermally unstable roosts contrasts with behaviors of tricolored bats in thermally stable roosts. Therefore, tricolored bat using thermally unstable roosts may be less susceptible to WNS. More broadly, these results highlight the importance of understanding the effect of roost thermal stability on winter torpor patterns and the physiological flexibility of broadly distributed hibernating species.

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No Sign of Infection in Free-Ranging Myotis austroriparius Hibernating in the Presence of Pseudogymnoascus destructans in Alabama

Cited by 3 publications

References 29 publications

The Physiological Ecology of White-Nose Syndrome (WNS) in North American Bats

The Physiological Ecology of White-Nose Syndrome (WNS) in North American Bats

Roost thermal stability influences winter torpor patterns in a threatened bat species

Thermally unstable roosts influence winter torpor patterns in a threatened bat species

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