Use of a Bridge for Day Roosting by the Hoary Bat, &lt;em&gt;Lasiurus cinereus&lt;/em&gt;

Hendricks, Paul; Johnson, Joseph S.; Lenard, Susan.; Currier, Coburn

doi:10.22621/cfn.v119i1.92

Cited by 3 publications

(3 citation statements)

References 13 publications

(15 reference statements)

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“…Our encounter of a female Hoary Bat with two young in a wood bridge in 2003 is apparently the first documented case of bridge use by this species (7,12,38,39). Hoary Bats usually roost in tree foliage (40,41) and only rarely use man-made structures.…”

Section: Bridge Use In Montanamentioning

confidence: 85%

Bat use of highway bridges in south-central Montana /

Hendricks¹,

Lenard²,

Currier³

et al. 2005

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We studied use of highway structures by bats in the Billings, Montana area during 2003 and 2004. We found evidence of bat use at 78 of 130 highway structures examined during summer 2003 in Carbon, Stillwater, and Yellowstone counties; 66 structures were used apparently exclusively for night roosting, and 12 bridges were day roosts. Use of highway structures was widespread throughout the study area and among the state highway system categories (Interstate: 73.2%, Primary: 47.2%, Secondary: 57.1%, Local/State Maintained: 60.0%). Day roosts were found in all highway system categories, but relatively more were in the Local/State Maintained category; maternity colonies were in all but the Interstate category. Bat species identified at day roosts included Big Brown Bat (Eptesicus fuscus), Hoary Bat (Lasiurus cinereus), Little Brown Myotis (Myotis lucifugus), and Western Small-footed Myotis (M. ciliolabrum), none of which is a state Animal Species of Concern; use of a bridge for day-roosting by the Hoary Bat is apparently the first documented case for this species. Day roosts occupied in 2003 and 2004 included maternity colonies of Big Brown Bat (2) and Little Brown Myotis (2). Use of bridges for roosting, and intensity of use at night roosts, were generally unrelated to the landscape within 3 km (1.86 miles) of the structure. Only mean percent of forest cover was significantly greater around day roost structures, but substantial overlap among unused, night roost, and day roost categories indicated that this pattern was a trend and not the major influence on structure use by bats. All day roosts were found within 8 km (5 miles) of riparian corridors. Bats used 75.9% of concrete structures, 37.5% of steel structures, and 31.6% of wooden ones. Day roosts were found in concrete or wood structures, none in steel; three maternity colonies were in wood bridges, one in a concrete bridge. Slab bridges were the least preferred concrete spans because they provided few if any protected sites for roosting bats on the underside of the deck. Night roosting bats perched on the exposed vertical surfaces of girders of concrete and steel bridges. Day roosting sites in concrete bridges included accessible expansion joints between cast-in-place and T-beam bridge sections, the longitudinal slots on the underdeck of parallel box-beam structures, and the space between two abutting bridge lanes. Day roosts in wood bridges included the narrow space between parallel girders, and the spaces between wood supports under the deck where railing posts were anchored. Of the 12 day-roosts found in 2003, nine, including all maternity colonies, were occupied on at least one visit in 2004. Maternity colonies were occupied from early June (possibly late May) into September, but dispersal from them had begun by late August.

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Section: Bridge Use In Montanamentioning

confidence: 85%

Bat use of highway bridges in south-central Montana /

Hendricks¹,

Lenard²,

Currier³

et al. 2005

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“…Additional protected spaces are created by expansion joints where the bridge decking meets the supporting superstructure (i.e., where the bridge meets either end of the road - Sparks et al, 2019). These narrow spaces, as well as other crevices within a bridge, are used by bats as day and night roosts, maternity colonies, and as hibernacula (Davis and Cockrum, 1963;Harrje, 1994;Keeley and Tuttle, 1999;Kellner and Rasheed, 2002;Feldhamer et al, 2003;Felts and Webster, 2003;Johnston et al, 2004;Keeley and Keeley, 2004;Hendricks et al, 2005b;Keeley, 2007;Tilova et al, 2008;Geluso and Mink, 2009;Amorim et al, 2013;Cleveland and Jackson, 2013;Cervone and Yeager, 2016;Kasper and Yancey, 2018;Meierhofer et al, 2018;Stevens et al, 2022). Beam and girder style bridges with open expansion joints (Fig.…”

Section: Bridge Design and Ideal Crevicesmentioning

confidence: 99%

Wildlife Use of Anthropogenic Structures: A Comprehensive Review of Bridge Use by Bats

Detweiler,

Bernard

2023

Acta Chiropterologica

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“…In USA out the use of bridges by bats as day or night roosts has been reported several times (Keeley & Tuttle 1999;Adam & Hayes 2000;Mcdonnell 2001;Feldhamer et al 2003;Hendricks et al 2005;Geluso & Mink 2009). Twenty-eight of the 47 bat species occurring in the USA are known to use bridges and culverts as day and/or night roosts (Keeley & Tuttle 1999;Hendricks et al 2005;Geluso & Mink 2009), with Tadarida brasiliensis being the most abundant and the most widespread species. Twenty-five of these species are listed as "low concern" and three are threatened (IUCN 2012).…”

Section: Introductionmentioning

confidence: 99%

Bridges over the troubled Conservation of Iberian Bats

2013

Barb

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In the last decades the availability of roosts has been one of the major limiting factors in bat conservation. Several human-made structures mimic the conditions occurring in natural roosts allowing the maintenance of bat populations and in some cases, even their range expansion. In the USA and Europe several bridges have been reported to be used by bats as roosts. We surveyed 52 bridges in Northeastern Portugal and found that 28 bridges were used by bats from 16 species. Most species seem to use bridge crevices, but cave dwellers were also observed in box girders. At least 3145 individuals were found roosting in crevices, most of which were identified as Tadarida teniotis. A total of 728 individuals were captured in 8 different bridges. T. teniotis was the most common species since it was the target species of these captures. The observed sex bias toward females suggests that bridges are often used as breeding colonies. Signs of swarming and mating were also observed in September and October. Our results confirm that modern bridges can play an important role in bat conservation even contributing to range expansions.

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Use of a Bridge for Day Roosting by the Hoary Bat, <em>Lasiurus cinereus</em>

Cited by 3 publications

References 13 publications

Bat use of highway bridges in south-central Montana /

Bat use of highway bridges in south-central Montana /

Wildlife Use of Anthropogenic Structures: A Comprehensive Review of Bridge Use by Bats

Bridges over the troubled Conservation of Iberian Bats

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