Collected Evidence: Collected Evidence: Relocate access points to bat roosts within developments Two studies evaluated the effects of relocating access points to bat roosts within building developments on bat populations. One study was in Ireland and one in the UK. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (2 STUDIES)      Use (2 studies): One before-and-after study in Ireland found that fewer brown long-eared bats used a roost after the access points were relocated, and no bats were observed flying through them. One before-and-after study in the UK found that few lesser horseshoe bats used an alternative access point with a ‘bend’ design to re-enter a roost in a building development, but the number of bats using the roost increased after an access point with a ‘straight’ design was installed. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F946https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F946Tue, 10 Dec 2013 13:55:15 +0000Collected Evidence: Collected Evidence: Change timing of building work One study evaluated the effects of changing the timing of building work on bat populations. The study was in Ireland. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (1 STUDY)      Use (1 study): One before-and-after study in Ireland found that carrying out roofing work outside of the bat maternity season, along with retaining bat access points, resulted in a similar number of brown long-eared bats continuing to use a roost within an attic. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F950https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F950Fri, 20 Dec 2013 09:23:40 +0000Collected Evidence: Collected Evidence: Protect brownfield or ex-industrial sites One study evaluated the effects of protecting brownfield or ex-industrial sites on bat populations. The study as in the USA. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One study in the USA found that five bat species were recorded within a protected urban wildlife refuge on an abandoned manufacturing site. POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F953https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F953Fri, 20 Dec 2013 09:36:12 +0000Collected Evidence: Collected Evidence: Create tree plantations on agricultural land Three studies evaluated the effects of creating tree plantations on agricultural land on bat populations. The three studies were in Australia. COMMUNITY RESPONSE (3 STUDIES) Richness/diversity (3 studies): Three replicated, site comparison studies in Australia found no difference in the number of bat species in agricultural areas with and without plantations of native trees. POPULATION RESPONSE (3 STUDIES) Abundance (3 studies): Two of three replicated, site comparison studies in Australia found no difference in bat activity (relative abundance) in agricultural areas with and without plantations of native trees. The other study found higher bat activity in plantations next to remnant native vegetation than in isolated plantations or over grazing land. In all three studies, bat activity was lower in plantations compared to original forest and woodland remnants. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F958https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F958Fri, 20 Dec 2013 10:09:11 +0000Collected Evidence: Collected Evidence: Pay farmers to cover the costs of conservation measures (e.g. agri-environment schemes) Three studies evaluated the effects of agri-environment schemes on bat populations. The three studies were in the UK. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (3 STUDIES) Abundance (3 studies): Two of three replicated, paired sites studies in the UK found that overall bat activity (relative abundance) or the occurrence of six bat species did not differ significantly between farms managed under agri-environment schemes and those managed conventionally. One of the studies found that agri-environment scheme farms had similar activity of five bat species, and lower activity of one bat species, compared to conventional farms. The other study found lower overall bat activity and activity of pipistrelle species on agri-environment scheme farms than conventional farms. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F962https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F962Fri, 20 Dec 2013 10:25:45 +0000Collected Evidence: Collected Evidence: Automatically reduce turbine blade rotation when bat activity is high Two studies evaluated the effects of automatically reducing turbine blade rotation when bat activity is high on bat populations. One study was in Germany, and one in the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Survival (2 studies): Two replicated studies (one randomized, controlled and one paired sites study) in Germany and the USA found that automatically reducing the rotation speed of wind turbine blades when bat activity is predicted to be high resulted in fewer bat fatalities for all bat species combined and for five bat species. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F971https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F971Fri, 20 Dec 2013 12:34:12 +0000Collected Evidence: Collected Evidence: Install bat gantries or bat bridges as road/railway crossing structures for bats Three studies evaluated the effects of installing bat gantries as road crossing structures for bats. Two studies were in the UK and one in France. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (3 STUDIES)      Use (3 studies): Two replicated studies (including one site comparison) in the UK found that fewer bats used bat gantries than crossed the road below at traffic height, and one bat gantry was not used at all. One replicated study in France found that a temporary bat gantry was used by three bat species/species groups, but almost half of crossing bats flew over the road at other locations. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F978https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F978Fri, 20 Dec 2013 14:12:20 +0000Collected Evidence: Collected Evidence: Install green bridges as road/railway crossing structures for bats One study evaluated the effects of installing green bridges as road crossing structures for bats. The study was in the UK. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (1 STUDY)      Use (1 study): One study in the UK found that a green bridge was used by 97% of bats crossing a road. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F979https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F979Fri, 20 Dec 2013 14:13:21 +0000Collected Evidence: Collected Evidence: Divert bats to safe crossing points over or under roads/railways with plantings or fencing One study evaluated the effects of diverting bats using an artificial hedgerow on bat populations. The study was in Switzerland. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (1 STUDY)      Use (1 study): One controlled, before-and-after study in Switzerland found that up to one fifth of lesser horseshoe bats within a colony flew along an artificial hedgerow to commute. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F981https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F981Fri, 20 Dec 2013 14:16:34 +0000Collected Evidence: Collected Evidence: Retain residual tree patches in logged areas Three studies evaluated the effects of retaining residual tree patches in logged areas on bat populations. The three studies were in Canada. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (3 STUDIES) Abundance (3 studies): Two replicated, site comparison studies in Canada found no difference in bat activity (relative abundance) along the edges of residual tree patches and the edges of clearcut blocks. One replicated, site comparison study in Canada found that the activity of smaller bat species was higher along the edge of residual tree patches than in the centre of clearcut blocks, but the activity of larger bat species did not differ. One replicated, controlled study in Canada found that residual tree patches had similar activity of little brown bats and northern long-eared bats and lower activity of silver-haired bats compared to clearcut forest patches. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F995https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F995Fri, 20 Dec 2013 15:39:45 +0000Collected Evidence: Collected Evidence: Retain forested corridors in logged areas Three studies evaluated the effects of retaining forested corridors in logged areas on bat populations. The three studies were in the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Abundance (1 studies): One replicated, site comparison study in the USA found that bat activity (relative abundance) was significantly higher along the edges of forested corridors than in corridor interiors or in adjacent logged stands, which had similar activity levels. BEHAVIOUR (2 STUDIES)   Use (2 studies): One replicated, site comparison study in the USA found more Seminole bats roosting in forested corridors than logged stands or mature forest. One replicated, site comparison study in the USA found more male but fewer female evening bats roosting in forested corridors than logged stands. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F996https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F996Fri, 20 Dec 2013 15:44:57 +0000Collected Evidence: Collected Evidence: Translocate bats Two studies evaluated the effects of translocating bats on bat populations. One study was in New Zealand and one study was in Switzerland. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Reproductive success (1 study): One study in Switzerland found that a female greater horseshoe bat that settled at a release site after translocation had a failed pregnancy. Survival (1 study): One study in Switzerland found that four of 18 bats died after translocation. Condition (1 study): One study in New Zealand found that lesser short-tailed bats captured at release sites eight months after translocation were balding and had damaged, infected ears. BEHAVIOUR (2 STUDIES)   Uptake (2 studies): Two studies in New Zealand and Switzerland found that low numbers of bats remained at release sites after translocation. Behaviour change (1 study): One study in Switzerland found that bats homed after release at translocation sites less than 20 km from their original roosts. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1009https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1009Fri, 20 Dec 2013 17:44:38 +0000Collected Evidence: Collected Evidence: Use low intensity lighting Three studies evaluated the effects of using low intensity lighting on bat populations. The three studies were in the UK. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): One replicated, randomized, controlled study in the UK found that activity (relative abundance) of lesser horseshoe bats, but not myotis bats, was higher along hedges with medium or low intensity lighting than hedges with high intensity lighting. One replicated, randomized, controlled study in the UK found that activity of myotis bats, but not common pipistrelles, was higher along treelined roads with street lights dimmed to an intensity of 25% than roads with streetlights dimmed to 50% or left undimmed. BEHAVIOUR (1 STUDY)         Behaviour change (1 study): One replicated, controlled study in the UK found that more soprano pipistrelles emerged from two roosts when the intensity of red lights was reduced by placing filters over them. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1018https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1018Fri, 20 Dec 2013 17:58:34 +0000Collected Evidence: Collected Evidence: Manage hedges to benefit bats Two studies evaluated the effects of managing hedges to benefit bat populations. Both studies were in the UK. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, site comparison study in the UK found that hedges trimmed ≥3 years prior had more bat species recorded along them than hedges trimmed during the previous winter. POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): One replicated, paired sites study in the UK found that pipistrelle activity (relative abundance) did not differ between hedges managed for wildlife on agri-environment scheme farms and hedges on conventional farms. One replicated, site comparison study in the UK found that hedges trimmed ≥3 years prior had higher activity of two of eight bat species/species groups than hedges trimmed during the previous winter. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1943https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1943Tue, 04 Dec 2018 09:54:05 +0000Collected Evidence: Collected Evidence: Manage livestock water troughs as a drinking resource for bats Two studies evaluated the effects of managing livestock water troughs as a drinking resource for bats. Both studies were in the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (2 STUDIES)      Use (2 studies): One replicated, paired sites study in the USA found that removing livestock modifications from water troughs resulted in bats drinking from them more frequently. One paired sites study in the USA found that livestock water tanks that were larger, full of water or surrounded by sparse vegetation had more bats drinking from them than smaller, half full tanks surrounded by no or dense vegetation. Behaviour change (1 study): One replicated, paired sites study in the USA found that when livestock modifications were removed from water troughs, bats approached troughs fewer times before successfully drinking from them. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1951https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1951Tue, 04 Dec 2018 12:19:55 +0000Collected Evidence: Collected Evidence: Use non-lethal measures to prevent bats from accessing fruit in orchards to reduce human-wildlife conflict Two studies evaluated the effects of using non-lethal measures to prevent bats from accessing fruit in orchards to reduce human-wildlife conflict. The studies were in Madagascar and Mauritius. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (0 STUDIES) OTHER (2 STUDIES)    Human-wildlife conflict (2 studies): Two replicated, controlled studies (including one randomized study) in Madagascar and Mauritius found that using an organic deterrent spray, hanging plastic flags in trees, or covering individual tree branches with nylon net bags reduced damage to lychees caused by Madagascan flying foxes or Mauritius fruit bats. One of the studies found that ringing bells in lychee trees deterred most Madagascan flying foxes. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1953https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1953Tue, 04 Dec 2018 12:22:55 +0000Collected Evidence: Collected Evidence: Maintain bat roosts in road/railway bridges and culverts Two studies evaluated the effects of maintaining bat roosts within road bridges on bat populations. One study was in Ireland and one in the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (2 STUDIES)      Use (2 studies): One before-and-after study in Ireland found that a maternity colony of Daubenton’s bats continued to roost in a road bridge over a river in similar numbers after crevices were retained during repair work. One review in the USA found that when bat roosts were maintained during bridge replacement works, Yuma myotis and Mexican free-tailed bats recolonised most roosts in similar numbers to before the works, but pallid bats did not return. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1966https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1966Tue, 04 Dec 2018 18:03:09 +0000Collected Evidence: Collected Evidence: Install fencing around cave entrances to restrict public access Two studies evaluated the effects of installing fencing around cave entrances on bat populations. One study was in the USA and one study was in Spain. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Spain found no difference in the population growth rates of bats roosting in caves with and without fencing or gates installed. BEHAVIOUR (2 STUDIES)   Use (1 study): One replicated, site comparison study in Spain found no difference in the occupancy rates of bats roosting in caves with and without fencing or gates installed. Behaviour change (1 study): One controlled, before-and-after study in the USA found that significantly more southeastern myotis bats and gray myotis bats emerged from a cave after a steel gate was replaced with a fence. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1991https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F1991Wed, 05 Dec 2018 12:39:50 +0000Collected Evidence: Collected Evidence: Treat bats for infection with white-nose syndrome Two studies evaluated the effects of treating bats with a probiotic bacterium to reduce white-nose syndrome infection. One study was in Canada and one in the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Survival (2 studies): One randomized, controlled study in Canada found that treating little brown bats with a probiotic bacterium at the time of infection with white-nose syndrome (but not 21 days prior) increased survival within cages in a laboratory. One randomized, controlled study in the USA found that treating little brown bats with a probiotic bacterium within a mine increased survival for free-flying bats, but not caged bats. Condition (2 studies): One randomized, controlled study in Canada found that little brown bats caged in a laboratory and treated with a probiotic bacterium at the time of infection with white-nose syndrome had reduced symptoms of the disease, but bats treated 21 days prior to infection had worse symptoms. One randomized, controlled study in the USA found that little brown bats kept within cages in a mine and treated with a probiotic bacterium had a similar severity of white-nose syndrome to untreated bats. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2008https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2008Wed, 05 Dec 2018 15:40:15 +0000Collected Evidence: Collected Evidence: Avoid illumination of bat commuting routes Three studies evaluated the effects of avoiding the illumination of bat commuting routes on bat populations. Two studies were in the UK and one was in the Netherlands. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (3 STUDIES) Abundance (3 studies): One replicated, before-and-after study in the Netherlands found similar numbers of pond bats flying along unlit canals and canals illuminated with lamps. Two replicated, controlled studies in the UK found greater activity (relative abundance) of lesser horseshoe bats and myotis bats along unlit hedges than along hedges illuminated with street lights, but activity was similar for common and soprano pipistrelles and Nyctalus/Eptesicus species along unlit and illuminated hedges. BEHAVIOUR (2 STUDIES)      Behaviour change (2 studies): One replicated, before-and-after study in the Netherlands found that 28–96% of pond bats changed their flight paths along canals to avoid light spill from lamps. One replicated, controlled study in the UK found that lesser horseshoe bats were active earlier along unlit hedges than along those illuminated with street lights. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2017https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2017Wed, 05 Dec 2018 17:50:59 +0000Collected Evidence: Collected Evidence: Avoid illumination of bat foraging, drinking and swarming sites Two studies evaluated the effects of avoiding the illumination of bat drinking sites on bat populations. Both studies were in Italy and one was also in Israel. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): Two replicated before-and-after studies (one randomized) in Italy found that unlit water troughs had greater activity (relative abundance) of five of six bat species/species groups and six of eight bat species/species groups than troughs illuminated with artificial light. One of the studies also found that unlit desert ponds in Israel had greater activity (relative abundance) of three bat species than illuminated ponds. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2018https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2018Wed, 05 Dec 2018 17:52:42 +0000Collected Evidence: Collected Evidence: Use red lighting rather than other lighting colours Three studies evaluated the effects of red lighting on bat populations. Two studies were in the Netherlands and one was in the UK. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): One replicated, controlled, site comparison study in the Netherlands found that red lighting resulted in higher activity (relative abundance) for one of three bat species groups than white or green lighting. One site comparison study in the Netherlands found that culverts illuminated with red light had similar activity of commuting Daubenton’s bats as culverts illuminated with white or green light. BEHAVIOUR (1 STUDY)         Behaviour (1 study): One replicated, controlled study in the UK found that more soprano pipistrelles emerged from a roost when lit with red light than when lit with white light, but no difference was found between red and blue lights. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2021https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2021Wed, 05 Dec 2018 18:06:28 +0000Collected Evidence: Collected Evidence: Conserve roosting sites for bats in old structures or buildings Three studies evaluated the effects of conserving roosting sites for bats in old structures or buildings on bat populations. Two studies were in the UK and one was in Germany. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Abundance (1 study): One before-and-after study in the UK found that a greater number of bats hibernated in a railway tunnel after walls with access grilles were installed at the tunnel entrances and wood was attached to the tunnel walls. BEHAVIOUR (2 STUDIES)      Uptake (1 study): One before-and-after study in Germany found that numbers of bats hibernating in a disused cellar after it was emptied of rubbish increased over 11 years. Use (2 studies): One before-and-after study in Germany found that a disused cellar that was emptied of rubbish was used by hibernating bats of four species. One before-and-after study in the UK found that Natterer’s bats used a roost that was ‘boxed-in’ within a church, but the number of bats using the roost was reduced by half. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2046https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2046Fri, 07 Dec 2018 10:43:53 +0000Collected Evidence: Collected Evidence: Restore or create forest or woodland Two studies evaluated the effects of restoring forests on bat populations. One study was in Brazil and one in Australia. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One site comparison study in Brazil found that a reforested area had significantly lower bat diversity than a native forest fragment. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, controlled, site comparison study in Australia found that forests restored after mining had significantly higher or similar bat activity (relative abundance) as unmined forests for five of seven bat species. BEHAVIOUR (0 STUDIES)      Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2050https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2050Fri, 07 Dec 2018 12:43:26 +0000Collected Evidence: Collected Evidence: Manage microclimate of artificial bat roosts Three studies evaluated the effects of managing the microclimate of artificial bat roosts on bat populations. Two studies were in the UK and one in Spain. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Abundance (1 study): One before-and-after study in Spain found more bats in two artificial roosts within buildings after they had been modified to reduce internal roost temperatures. BEHAVIOUR (2 STUDIES) Use (2 studies): One replicated, before-and-after study in the UK found that heated bat boxes were used by common pipistrelle bats at one of seven sites, but none were used by maternity colonies. One replicated study in the UK found that none of the 12 heated bat boxes installed within churches were used by displaced Natterer’s bats. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2052https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F2052Fri, 07 Dec 2018 19:21:01 +0000
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What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

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