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Secondary Use of Aspen Cavities by Tree-Roosting Big Brown Bats

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Secondary Use of Aspen Cavities by Tree-Roosting Big Brown Bats J. Wildl. Manage. 62(2):1998 LONG-LEGGEDMYOTIS * Ormsbee and McComb 603 owl, appendix A, forest ecosystem management: ham, editors. Bats and forests symposium. British an ecological, economic, and social assessment. Columbia Ministry of Forests, Victoria, British Report of the Forest Ecosystem Management As- Columbia, Canada. sessment Team, Portland, Oregon, USA. --, AND R. M. R. BARCLAY.1996. Roost-site se- Kalcounis, M.C.VALES, and D. J., R.M.AND F. L. BUNNELL.Brigham. 1985. Compari- 1998. Secondarylection and roosting use ecology of of aspen forest-dwelling cavities sons of methods for estimating forest overstory bats in southern British Columbia. Canadian by tree roosting bigcover. Ministriesbrown of Environment bats. Journal and Forests Re- of WildlifeJournal of Zoology Management 74:1797-1805. 62(2): 603-611. port IWIFR-20. WARNER, R. M., AND N. J. CZAPLEWSKI. 1984. Long- Made availableVONHOF, courtesy M. J. 1996. of Roost-site the Wildlifepreferences of big Society: legged myotis.http://joomla.wildlife.org/ Mammalian Species 224:1-4. brown bats (Eptesicus fuscus) and silver-haired bats (Lasionycteris noctivagans) in the Pend Received 14 May 1997. D'Oreille Valley in southern British Columbia. Accepted 30 September 1997. Pages 62-80 in R. M. R. Barclay and R. M. Brig- Associate Editor: Lochmiller SECONDARYUSE OF ASPEN CAVITIESBY TREE-ROOSTINGBIG BROWN BATS MATINAC. KALCOUNIS,,2 Department of Biology,University of Regina, Regina,SK S4S 0A2, Canada R. MARKBRIGHAM, Department of Biology,University of Regina, Regina, SK S4S 0A2, Canada Abstract: To further explore natural roost-site selection by temperate bats, we examined the use of tree roost sites by big brown bats (Eptesicus fuscus) in the West Block of Cypress Hills Provincial Park, Saskatchewan, an area where the number of human structures is limited. In this area, we found big brown bats roosted exclusively in cavities of trembling aspen trees (Populus tremuloides), despite the availability of cavities in snags of conifer trees. Most cavities had been excavated and previously used by yellow-bellied sapsuckers (Sphyr- apicus varius). The use of aspens by sapsuckers relates to the relatively soft wood and susceptibility to heart rot of these trees, which provide ideal conditions for nesting: decayed heartwood with a firm sapwood shell. Orientation of cavity entrances was close to due south. The width of bats and the width of cavity entrances differed, suggesting that bats are not using roosts for protection from predators or exclusion of competitors. Bats showed fidelity to a particular group of roost trees because, despite roost switching, bats reunited in subsequent roost sites. During the day, temperatures in aspen cavities were approximately 50C cooler than in cavities of conifer snags. Microclimate differences, including temperature, may be why aspen cavities are selected over available cavities in conifer snags. All of the randomly selected cavities in aspen that we searched showed evidence of use by bats, which suggests roost sites for big brown bats in southwestern Saskatchewan may be a limiting resource. JOURNALOF WILDLIFEMANAGEMENT 62(2):603-611 Key words: bats, Eptesicus fuscus, habitat complexity, maternity colony, roost, switching, temperature, tree- cavity, trembling aspen. In comparison to use of nest sites by birds, man structure than in a natural site such as a relatively little is known about use of roost sites tree cavity. As a result, factors that influence by bats, especially use of natural roosts such as selection of roost sites by bats under natural tree cavities. The majority of ecological and be- conditions where human structures are not havioral research on temperate insectivorous abundant are poorly understood (for review see bats is from (Chiroptera: Vespertilionidae) spe- Brigham and Barclay 1996). cies in human because it is roosting structures, Selection of specific roost sites by breeding easier to find and access bats in a hu- roosting female bats has consequences to survival and reproductive success (Entwistle et al. 1997), Present address: and Evolution 1 Ecology Group, and there is mounting evidence that bats choose Department of Zoology, University of Western Ontar- io, London, ON N6A 5B7, Canada. roost sites for reasons of microclimate, protec- 2 E-mail: [email protected] tion from predators, avoidance of parasites, and Kalcounis, M.C. and R.M. Brigham. 1998. Secondary use of aspen cavities by tree roosting big brown bats. Journal of Wildlife Management 62(2): 603-611. Made available courtesy of the Wildlife Society: http://joomla.wildlife.org/ 604 BIGBROWN BATS * Kalcounisand Brigham J. Wildl. Manage.62(2):1998 social interaction (this study; also see reviews in terms of flight, but predation risk may differ Lewis 1995, 1996). Roost type (building, tree between simple and complex habitats. When in- cavity, rock crevice, cave) may be unimportant dividuals emerge from a maternity colony, many to bats, provided roost type satisfies other re- individuals may exit in a relatively short period, quirements such as characteristics of the roost which makes the event conspicuous (Speakman or the habitat surrounding the roost. Physical et al. 1992). Emergence is also highly correlated characteristics of a roost can influence the pro- with sunset and is therefore predictable in time tection afforded by the roost and the microcli- (Kalcounis and Brigham 1994). Thus, if bats mate within the roost, whereas amount of hab- perceive a predation risk, they may select roosts itat surrounding the roost can influence flight surrounded by complex habitat to conceal pre- performance capabilities of both juvenile and dictable and conspicuous emergence events. adult females and can influence predation risk The purpose of this paper is to describe the to individuals in the roost. suite of physical characteristics, including roost Nonetheless, the influence of roost microcli- microclimate, that define big brown bat roost mate on use of roost sites is not clear. For ex- trees in Cypress Hills Provincial Park, Saskatch- ample, the leaf-nosed bat (Hipposideros speo- ewan, where this species exclusively roosted in ris) exhibits high fidelity to dark roost sites with- the cavities of trembling aspen (Kalcounis in caves (Usman 1988), whereas the Indiana bat 1995). We also test the hypotheses that (1) to (Myotis sodalis) uses tree-roost sites in unshad- avoid predators and competitors, big brown bats ed locations (Kurta et al. 1993a,b). Similarity in choose roost sites with cavity entrances not internal temperatures between different roost much larger than themselves; (2) the complexity types suggests that selection of roost sites may of the habitat directly in front of the roost-cavity involve locating a specific range of thermal con- opening is lower than that in other directions; ditions. For example, in South Africa, bats from and (3) the thermal microclimate of cavities the family Rhinolophidae select roosts in hollow used by big brown bats (in aspen) will differ baobab trees (Adansonia digitate), Vespertilion- from cavities not used by bats (in conifer snags). idae select roosts in hollow trees (Col- mopane STUDYAREA ophospermum mopane), and Molossidae select roosts in building attics because all roosts offer This study was conducted during the sum- similar temperature regimes (Fenton and Rau- mers of 1993 and 1994, within the West Block tenbach 1986). Further, the orange horseshoe of Cypress Hills Provincial Park (49034'N, bat (Rhinonycteris aurantius) in India occupies 109053'W), approximately 60 km southwest of a narrow range of available humidity in its cave Maple Creek, Saskatchewan. The Cypress Hills roost sites (Churchill 1991). run about 50 km in an east-west direction and The ontogeny of juvenile flight (Adams 1997) form the highest elevated plateau in the Cana- and the decreased maneuverability of pregnant dian prairies (Sauchyn 1993). Lodgepole pine bats (Norberg and Rayner 1987) may make less (Pinus contorta) forest occupies dry sites above complex habitat around entrances to roost trees 1,300 m, and white spruce (Picea glauca) forest a preferred characteristic. Juvenile bats in tree occurs in cool, moist areas near wetlands and hollows, in contrast to bats roosting in buildings, on north-facing slopes. The understory of are generally unable to perform practice flights spruce forest is relatively diverse and includes before venturing outside for the first time. several plant species with distributions disjunct When juvenile little brown bats (Myotis lucifu- from mountain populations. Trembling aspen is gus) take their first flights, they remain close to found growing with white spruce near streams the roost, avoid acoustically complex habitat, on south-facing slopes. and do not insects In- pursue (Buchler 1980). METHODS creases in body mass also affect habitat use by Data little brown bats whereby heavier bats forage in Collection less complex habitats (Kalcounis and Brigham Locating Roost Trees.-We located roost 1995). Pregnant female bats may therefore se- trees by tracking radiocollared bats or by lect roost sites where the number of objects to searching randomly selected cavities for the ev- detect and avoid in front of the cavity entrance idence of use by bats. For the purpose of ra- is low. diotelemetry, we initially used mist nets to cap- Not only is habitat complexity relevant in ture bats. Upon capture, we affixed 0.8-g trans- Kalcounis, M.C. and R.M. Brigham. 1998. Secondary use of aspen cavities by tree roosting big brown bats. Journal of Wildlife Management 62(2): 603-611. Made available courtesy of the Wildlife Society: http://joomla.wildlife.org/ J. Wildl. Manage.62(2):1998 BIG BROWNBATS * Kalcounisand Brigham 605 CAVITYOPENING DIRECTION mitters (BD-2T, Holohil Systems, Woodlawn, Ontario, Canada) via Skinbond cement. Individ- (A) uals carrying radiotransmitters were tracked to their roosts the morning following capture via Merlin 12 (Custom Electronics, Urbana, Illi- nois, USA) portable telemetry receivers and 450 hand-held Yagi antennae. When we located a roost tree, it was observed at dusk to ensure it was used by bats and to determine colony size.
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