Post-white-nose syndrome passive acoustic sampling effort for determining bat species occupancy within the mid-Atlantic region

Deeley, Sabrina; Kalen, Nicholas J.; Freeze, Samuel R.; Barr, Elaine L.; Ford, W. Mark

doi:10.1016/j.ecolind.2021.107489

Cited by 8 publications

(8 citation statements)

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“…We identified 2 distinct peaks in northern longeared bat acoustic activity. The peak at the beginning of the acoustic sampling period likely reflects adult females establishing maternity colonies (Deeley et al 2021). The decline in mid-June likely corresponds to parturition, with the in crease in activity at the end of June until July corresponding to juvenile volancy and foraging followed by a gradual dispersal of bats from the natal area (Rydell 1993, Ford et al 2011, Deeley et al 2021.…”

Section: Discussionmentioning

confidence: 99%

“…The peak at the beginning of the acoustic sampling period likely reflects adult females establishing maternity colonies (Deeley et al 2021). The decline in mid-June likely corresponds to parturition, with the in crease in activity at the end of June until July corresponding to juvenile volancy and foraging followed by a gradual dispersal of bats from the natal area (Rydell 1993, Ford et al 2011, Deeley et al 2021. Using this information, we ap proximated a general juvenile volancy start date at the low point between the 2 peaks in activity on June 24 (day of the year: 176; Deeley et al 2021).…”

Section: Discussionmentioning

confidence: 99%

“…The decline in mid-June likely corresponds to parturition, with the in crease in activity at the end of June until July corresponding to juvenile volancy and foraging followed by a gradual dispersal of bats from the natal area (Rydell 1993, Ford et al 2011, Deeley et al 2021. Using this information, we ap proximated a general juvenile volancy start date at the low point between the 2 peaks in activity on June 24 (day of the year: 176; Deeley et al 2021). Our capture results supported this estimate, as all adult females were either pregnant or lactating prior to this date, and all juveniles were captured after this date…”

Section: Discussionmentioning

confidence: 99%

“…We used all locations where female or juvenile northern long-eared bats were documented (capture sites and roosts) in our analysis. (Ford et al 2005, Austin et al 2018, Deeley et al 2021. At most sampling regions, acoustic recording occurred the same year(s) as mist-netting efforts (see Table 1 for details).…”

Section: Field Methodsmentioning

confidence: 99%

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Broad-scale geographic and temporal assessment of northern long-eared bat (Myotis septentrionalis) maternity colony-landscape association

Gorman

Deeley

Barr

et al. 2022

Endang. Species. Res.

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As the federally threatened northern long-eared bat Myotis septentrionalis continues to decline due to white-nose syndrome (WNS) impacts, the application of effective conservation measures is needed but often hindered by the lack of ecological data. To date, recommended management practices have been adopted in part from other federally listed sympatric species such as the endangered Indiana bat M. sodalis. During the maternity season, these measures have largely focused on conservation of known day-roost habitat, often with little consideration for foraging habitat, particularly riparian areas. We examined acoustic activity of northern long-eared bats relative to day-roost and capture data at coastal and interior sites in the District of Columbia, New York, Pennsylvania, Virginia, and West Virginia, USA, over the course of 6 summers (2015-�2020), where maternity activity was still documented after the initial arrival and spread of WNS. Acoustic activity of northern long-eared bats relative to forest cover decreased at the acoustic site level (fine scale) but increased at the sampling region level (coarse scale). We observed a positive association of northern long-eared bat acoustic activity with riparian areas. Additionally, we observed higher levels of activity during pregnancy through early lactation period of the reproductive cycle prior to juvenile volancy. Our findings suggest the need for more explicit inclusion of forested riparian habitats in northern long-eared bat conservation planning. Acoustic sampling in spring and early summer rather than mid- to late summer and in forested riparian areas is the most effective strategy for identifying potential active northern long-eared bat maternity colonies on the local landscape.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Field Methodsmentioning

confidence: 99%

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Broad-scale geographic and temporal assessment of northern long-eared bat (Myotis septentrionalis) maternity colony-landscape association

Gorman

Deeley

Barr

et al. 2022

Endang. Species. Res.

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“…Among North American insectivorous bat species there is great diversity relative to foraging habitat selection, which is linked to variation in species' echolocation call structure and wing morphology (Aldridge andRautenbach 1987, Norberg andRayner 1987). Most capture and acoustic bat studies frequently use broad, land-cover categories including woodland, open water, agricultural, and urban (Menzel et al 2005, Sparks et al 2005, Johnson et al 2008, Deeley et al 2021a, or forest-specific categories including mature, thinned, riparian, edge, or interior (Humes et al 1999, Loeb and O'Keefe 2006, Hein et al 2009, McGowan and Hogue 2016. Still, smaller-scale vegetation measurements comprising forest canopy cover, canopy height, tree density, and basal area impact local selection and activity patterns (Ford et al 2005, Bender et al 2015, Cox et al 2016, Austin et al 2019 as well as acoustic detection probability (O'Keefe et al 2014).…”

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confidence: 99%

White‐nose Syndrome and Environmental Correlates to Landscape‐Scale Bat Presence

Barr

Silvis

Armstrong

et al. 2021

Wildlife Society Bulletin

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Over the past 13 years, White-nose Syndrome (WNS) has caused North American bat population declines and shifted community structure towards species less or unaffected by the disease. Mistnetting, acoustic surveys, and cave count data have been used to document changes in bat presence and activity through site-specific, pre-and post-WNS studies. Management and survey guidance often must be applied at a combined landscape and site-specific scale. Our objective was to explore the relationships among WNS impact, influence of available hibernacula, and environmental factors for the nightly presence of 3 WNS-affected bats: the Indiana bat (Myotis sodalis), northern long-eared bat (M. septentrionalis), and big brown bat (Eptesicus fuscus). We used recordings from 10 acoustic monitoring study areas, each with 3 survey locations across the states of Virginia, West Virginia, Ohio and Kentucky to assess changes in nightly bat presence during the summer of 2017. There were significant positive and negative correlates of broad land-cover categories for presence of all 3 bat species. Our findings also corroborated trends in abundance and distribution patterns found in prior, smaller-scale studies, supporting the relevance of land cover categories in a large-scale acoustic monitoring framework. We observed a negative association between WNS impact-years and nightly northern long-eared bat presence, but low occurrence and patchy distribution reduced our ability to infer strong relationships. Big brown bat presence showed a significant positive relationship with WNS occurrence on the landscape, providing evidence that big brown bats are maintaining populations after years of exposure. Indiana bats were the least-documented species, limiting the strength of our conclusions, but we did observe significant temporal patterns in nightly presence, with higher probabilities of presence earlier in the summer. Our results show the potential efficacy of using a WNS impact metric to predict summer bat presence, inform current U.S. Fish and Wildlife Service acoustic monitoring guidelines, and highlight which environmental variables are relevant for large-scale acoustic monitoring.

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White-nose syndrome, winter duration, and pre-hibernation climate impact abundance of reproductive female bats

Krueger,

Williams,

O’Keefe

et al. 2024

PLoS ONE

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White-nose syndrome (WNS) is an infectious disease that disrupts hibernation in bats, leading to premature exhaustion of fat stores. Though we know WNS does impact reproduction in hibernating female bats, we are unsure how these impacts are exacerbated by local climate factors. We compiled data from four southeastern U.S. states and used generalized linear mixed effects models to compare effects of WNS, pre-hibernation climate variables, and winter duration on the number of reproductive females in species across the range of WNS susceptibility. We predicted we would see a decline in the number of reproductive females in WNS-susceptible species, with the effect exaggerated by longer winter durations and pre-hibernation climate variables that lead to reductions in foraging. We found that the number of reproductive females in WNS-susceptible species was positively correlated with pre-hibernation local climate conditions conducive to foraging; however, WNS-susceptible species experienced an overall decline with the presence of WNS and as winter duration increased. Our long-term dataset provides evidence that pre-hibernation climate, specifically favorable summer weather conditions for foraging, greatly influences the reproduction, regardless of WNS status.

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Post-white-nose syndrome passive acoustic sampling effort for determining bat species occupancy within the mid-Atlantic region

Cited by 8 publications

References 38 publications

Broad-scale geographic and temporal assessment of northern long-eared bat (Myotis septentrionalis) maternity colony-landscape association

Broad-scale geographic and temporal assessment of northern long-eared bat (Myotis septentrionalis) maternity colony-landscape association

White‐nose Syndrome and Environmental Correlates to Landscape‐Scale Bat Presence

White-nose syndrome, winter duration, and pre-hibernation climate impact abundance of reproductive female bats

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