Collected Evidence: Collected Evidence: Protect greenfield sites or undeveloped land in urban areas Two studies evaluated the effects of protecting greenfield sites or undeveloped land in urban areas on butterflies and moths. One study was in Singapore and the other was in Mexico. COMMUNITY RESPONSE (2 STUDIES) Richness/diversity (2 studies): Two site comparison studies (including one replicated study) in Singapore and Mexico found that protected native forest and grassland in urban areas had a higher species richness of butterflies than urban parks or non-native Eucalyptus plantations. POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3836https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3836Mon, 04 Jul 2022 15:25:46 +0100Collected Evidence: Collected Evidence: Apply ecological compensation for developments Two studies evaluated the effects of on butterflies and moths of applying ecological compensation for developments. One was in the USA and the other was in Australia. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Abundance (1 study): One study in Australia reported that a population of purple copper butterfly caterpillars translocated from a development site to an area of compensatory and retained habitat increased in number over three years. BEHAVIOUR (1 STUDY) Use (1 study): One site comparison study in the USA reported that an area of lupines transplanted from a development site was used by a similar number of Karner blue butterflies to an area with no transplanted lupines. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3839https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3839Mon, 04 Jul 2022 15:40:59 +0100Collected Evidence: Collected Evidence: Change season/timing of prescribed burning Two studies evaluated the effects on butterflies and moths of changing the season or timing of prescribed burning. One study was in each of Australia and the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): One replicated, controlled, before-and-after study in Australia found that management of a tropical savanna and floodplain with early season burning or no burning for 2–5 years increased the abundance of caterpillars, but management with late season burning did not. One replicated, paired, controlled study in the USA found that Karner blue butterfly abundance was similar on grasslands managed by burning in summer or autumn, and on unmanaged grasslands. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3878https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3878Thu, 21 Jul 2022 16:32:42 +0100Collected Evidence: Collected Evidence: Leave some areas unburned during prescribed burning Two studies evaluated the effects on butterflies and moths of leaving some areas unburned during prescribed burning. Both studies were in the USA. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): One replicated study in the USA reported that the abundance of Karner blue butterflies increased over 2–3 years in oak savannas and prairies where unburned patches were left during prescribed burning. One replicated, site comparison study in the USA found that six out of nine specialist butterfly species were more abundant, one was less abundant, and two had similar abundance in pine barrens and prairies where unburned areas were left during prescribed burning compared to at sites without unburned areas. BEHAVIOUR (1 STUDY) Use (1 study): One replicated study in the USA reported that Karner blue butterflies were recorded using all 11 unburned patches which were surveyed within oak savannas and prairies managed by burning. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3879https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3879Thu, 21 Jul 2022 16:45:55 +0100Collected Evidence: Collected Evidence: Mechanically remove mid-storey or ground vegetation to create fire breaks Two studies evaluated the effects on butterflies and moths of mechanically removing mid-storey or ground vegetation to create fire breaks. One study was in Portugal and the other was in France. COMMUNITY RESPONSE (2 STUDIES) Richness/diversity (2 studies): One replicated, site comparison study in Portugal found that cork oak woodlands with more recent or more regular mechanical clearance of woody understorey vegetation had a greater species richness of butterflies than woodlands cleared less frequently or longer ago. One replicated, paired, controlled study in France reported that shrublands where trees and/or bushes were mechanically cleared to create firebreaks had a similar species richness of butterflies to a shrubland where grazing was used to suppress vegetation. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Portugal found that cork oak woodlands with more recent or more regular mechanical clearance of woody understorey vegetation had a higher abundance of butterflies than woodlands cleared less frequently or longer ago. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3881https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3881Thu, 21 Jul 2022 17:04:10 +0100Collected Evidence: Collected Evidence: Provide buffer strips to reduce pesticide and nutrient run-off into margins, waterways and ponds One study evaluated the effects on butterflies and moths of providing buffer strips to reduce pesticide and nutrient run-off into margins, waterways and ponds. This study was in the UK. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, paired, site comparison study in the UK found that margins next to water bodies managed with restrictions on fertilizer and pesticide use (as well as restrictions on mowing and grazing) had a similar species richness of moths to conventionally managed margins. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, paired, site comparison study in the UK found that margins next to water bodies managed with restrictions on fertilizer and pesticide use (as well as restrictions on mowing and grazing) had a greater abundance of moths than conventionally managed margins. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3894https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3894Tue, 09 Aug 2022 13:15:49 +0100Collected Evidence: Collected Evidence: Use genetically modified crops which produce pesticide to replace conventional pesticide application          One study evaluated the effects on butterflies and moths of using genetically modified crops which produce pesticide to replace conventional pesticide application. This study was in a laboratory. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Survival (1 study): One controlled study in a laboratory found that pollen from genetically modified maize expressing the Bacillus thuringiensis kurstaki (Btk) toxin against European corn borer did not reduce the survival of eastern tiger swallowtail or spicebush swallowtail caterpillars more than pollen from non-genetically modified maize. Condition (1 study): One controlled study in a laboratory found that pollen from genetically modified maize expressing the Bacillus thuringiensis kurstaki (Btk) toxin against European corn borer did not reduce the growth of eastern tiger swallowtail or spicebush swallowtail caterpillars more than pollen from non-genetically modified maize. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3895https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3895Tue, 09 Aug 2022 13:21:11 +0100Collected Evidence: Collected Evidence: Stop using herbicides on pavements and road verges Two studies evaluated the effects on butterflies and moths of stopping the use of herbicides on pavements and road verges. One study was in the USA and the other was in Canada. COMMUNITY RESPONSE (2 STUDIES) Richness/diversity (2 studies): One replicated, paired, site comparison study in the USA found that restored roadside prairies where herbicide application was restricted had a greater species richness of butterflies than verges dominated by non-native weeds and grasses with no restrictions on herbicide application. One replicated, site comparison study in Canada found that transmission lines (road verges and power lines) which were neither sprayed with herbicide nor mown had a similar species richness of butterflies to sprayed and mown transmission lines. POPULATION RESPONSE (2 STUDIES) Abundance (2 studies): One replicated, paired, site comparison study in the USA found that restored roadside prairies where herbicide application was restricted had a greater abundance of butterflies than verges dominated by non-native weeds and grasses with no restrictions on herbicide application. One replicated, site comparison study in Canada found that transmission lines (road verges and power lines) which were neither sprayed with herbicide nor mown had a greater abundance of northern pearl crescent and pearl crescent butterflies, but similar total butterfly abundance, compared to sprayed and mown transmission lines. Survival (1 study): One replicated, paired, site comparison study in the USA found that butterflies had a lower mortality risk on restored roadside prairies where herbicide application was restricted than on verges dominated by non-native grasses with no restrictions on herbicide application. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3899https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3899Tue, 09 Aug 2022 15:00:37 +0100Collected Evidence: Collected Evidence: Stop using pesticides as seed dressings and sprays in flower beds and greenspace One study evaluated the effects on butterflies and moths of stopping the use of pesticides as seed dressings and sprays in flower beds and greenspaces. The study was in France. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in France found that gardens where insecticides and herbicides were not used had a higher abundance of butterflies, but gardens where fungicides and snail pellets were not used had a lower abundance of butterflies BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3900https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3900Tue, 09 Aug 2022 15:03:07 +0100Collected Evidence: Collected Evidence: Use low intensity lighting One study evaluated the effects on butterflies and moths of using low intensity lighting. This study was in Germany. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (1 STUDY) Behaviour change (1 study): One replicated, paired, controlled study in Germany found that fewer moths were attracted to low intensity lights (which also emitted a narrower range of yellow light with little UV) than to higher intensity lights (which also emitted broader spectra and included UV). Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3902https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3902Tue, 09 Aug 2022 15:09:27 +0100Collected Evidence: Collected Evidence: Use shielded “full cut-off” lights to remove outwards lighting One study evaluated the effects on butterflies and moths of using shielded “full cut-off” lights to remove outwards lighting. This study was in Slovenia. COMMUNITY RESPONSE (0 STUDIES) POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (1 STUDY) Behaviour change (1 study): One replicated, paired, controlled study in Slovenia found that fewer individual moths and moth species were attracted to lights fitted with blinds to prevent light scattering (along with filters to remove shorter wavelengths) than to conventional lights without blinds or filters. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3904https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3904Tue, 09 Aug 2022 15:14:48 +0100Collected Evidence: Collected Evidence: Maintain traditional orchards to benefit butterflies and moths Two studies evaluated the effects of maintaining traditional orchards on butterflies and moths. One study was in each of the USA and Germany. COMMUNITY RESPONSE (2 STUDIES) Community composition (1 study): One replicated, site comparison study in Germany found that managed orchards had a similar community composition of butterflies and burnet moths to abandoned orchards. Richness/diversity (2 studies): One replicated, site comparison study in Germany found that managed orchards had a similar species richness of butterflies and burnet moths to abandoned orchards. One controlled study in the USA found that an unmanaged and a partially managed orchard had a greater species richness and diversity of leaf-eating arthropods (including caterpillars) than a commercially managed orchard. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Germany found that managed orchards had a lower abundance of butterflies and burnet moths than abandoned orchards. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3917https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3917Thu, 11 Aug 2022 11:04:20 +0100Collected Evidence: Collected Evidence: Manage perennial bioenergy crops to benefit butterflies and moths One study evaluated the effects on butterflies and moths of managing perennial bioenergy crops to benefit butterflies and moths. This study was in the USA. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, controlled study in the USA found that plots planted with a diverse mix of bioenergy crops had a greater species richness of butterflies than plots planted with fewer species. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, controlled study in the USA found that plots planted with a diverse mix of bioenergy crops had a higher abundance of butterflies than plots planted with fewer species. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3918https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3918Thu, 11 Aug 2022 11:12:26 +0100Collected Evidence: Collected Evidence: Manage vineyards to benefit butterflies and moths Two studies evaluated the effects on butterflies and moths of managing vineyards to benefit butterflies and moths. One study was in each of the USA and Spain. COMMUNITY RESPONSE (2 STUDIES) Richness/diversity (2 studies): One of two replicated, site comparison studies (including one paired study) in the USA and Spain found that grass strips between vine rows had a greater species richness of butterflies than the vine rows themselves, and vineyards managed with fewer chemicals had a greater species richness of butterflies than conventionally managed vineyards. The other study found that vineyards managed to encourage native plants, and where insecticide was rarely used, had a similar species richness of butterflies to conventionally managed vineyards. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, paired, site comparison study in the USA found that vineyards managed to encourage native plants, and where insecticide was rarely used, had a greater abundance of butterflies than conventionally managed vineyards. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3919https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3919Thu, 11 Aug 2022 11:19:09 +0100Collected Evidence: Collected Evidence: Grow native trees within perennial crop plantations One study evaluated the effects on butterflies and moths of growing native trees within perennial crop plantations. This study was in Costa Rica. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, site comparison study in Costa Rica found that coffee farms with a native and a non-native tree species growing within them had a higher diversity of butterflies than coffee farms with a single non-native tree species, but a similar diversity to coffee farms with two non-native tree species. The same study found a similar species richness of butterflies on all farms. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Costa Rica found that coffee farms with a native and a non-native tree species growing within them had a similar abundance of butterflies to coffee farms with one or two non-native tree species. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3920https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3920Thu, 11 Aug 2022 11:25:19 +0100Collected Evidence: Collected Evidence: Leave unharvested crop headlands within arable fields One study evaluated the effects of leaving unharvested crop headlands within arable fields. This study was in France. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, paired, site comparison study in France found that unharvested alfalfa headlands had a greater species richness of butterflies than harvested alfalfa or wheat fields. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, paired, site comparison study in France found that unharvested alfalfa headlands had a higher abundance of butterflies than harvested alfalfa or wheat fields. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3924https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3924Thu, 11 Aug 2022 17:02:01 +0100Collected Evidence: Collected Evidence: Manage rice field banks to benefit butterflies and moths One study evaluated the effects on butterflies and moths of managing rice field banks to benefit butterflies and moths. This study was in Italy. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, site comparison study in Italy found that unmown, herbicide-free rice field banks had a greater species richness of butterflies than banks which were mown or sprayed with herbicide. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Italy found that unmown, herbicide-free rice field banks had a higher abundance of butterflies, including large copper, than banks which were mown or sprayed with herbicide. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3928https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3928Thu, 11 Aug 2022 17:33:27 +0100Collected Evidence: Collected Evidence: Replace non-native species of tree/shrub with native species One study evaluated the effects on butterflies and moths of replacing non-native species of tree/shrub with native species. This study was in Panama. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, site comparison study in Panama found that established plantations of native trees had a similar species richness of butterflies to plantations of exotic trees, but a greater species richness than old growth forest. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Panama found that established plantations of native trees had a similar abundance of butterflies to plantations of exotic trees, but a higher abundance than old growth forest. BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3937https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3937Sat, 13 Aug 2022 14:55:09 +0100Collected Evidence: Collected Evidence: Create young plantations within mature woodland One study evaluated the effects on butterflies and moths of creating young plantations within mature woodland. This study was in the UK. COMMUNITY RESPONSE (0 STUDIES)   POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in the UK found that pearl-bordered fritillary and small pearl-bordered fritillary populations were more likely to persist for up to 20 years in woodlands with larger areas of young plantations (or coppicing) than in mature coniferous (both species) or deciduous (pearl-bordered fritillary only) woodland. BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3941https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3941Sat, 13 Aug 2022 14:57:33 +0100Collected Evidence: Collected Evidence: Remove tree canopy to reduce pond or waterway shading One study evaluated the effects on butterflies and moths of removing tree canopy to reduce pond or waterway shading. This study was in the USA. COMMUNITY RESPONSE (0 STUDIES)   POPULATION RESPONSE (1 STUDY) Survival (1 study): One replicated, randomized, paired, controlled study in the USA1 found that removing trees to reduce stream shading reduced the survival of Appalachian brown caterpillars and pupae, but did not affect egg survival. BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3952https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3952Sat, 13 Aug 2022 15:22:29 +0100Collected Evidence: Collected Evidence: Reintroduce mammals as ecosystem engineers One study evaluated the effects on butterflies and moths of reintroducing mammals as ecosystem engineers. This study was in Italy. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, site comparison study in Italy found that olive groves with wild boar present had a lower species richness of butterflies than groves without wild boar. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Italy found that olive groves with wild boar present had a lower total abundance of butterflies, and a lower abundance of six individual species, but a higher abundance of two species, than groves without wild boar. BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3953https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3953Sat, 13 Aug 2022 15:22:41 +0100Collected Evidence: Collected Evidence: Install artificial dams in streams to raise water levels One study evaluated the effects on butterflies and moths of installing artificial dams in streams to raise water levels. This study was in the USA. COMMUNITY RESPONSE (0 STUDIES)   POPULATION RESPONSE (1 STUDY) Survival (1 study): One replicated, randomized, paired, controlled study in the USA found that installing artificial dams in streams did not increase the survival of Appalachian brown butterfly eggs, caterpillars or pupae. BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3954https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3954Sat, 13 Aug 2022 15:22:51 +0100Collected Evidence: Collected Evidence: Mark the location of webs or caterpillars before mowing One study evaluated the effects on butterflies and moths of marking the location of webs or caterpillars before mowing. This study was in Poland. COMMUNITY RESPONSE (0 STUDIES)   POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, before-and-after study in Poland reported that after marsh fritillary caterpillar webs were marked before mowing, the number of webs increased the following year. BEHAVIOUR (0 STUDIES)  Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3970https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3970Sun, 14 Aug 2022 10:39:27 +0100Collected Evidence: Collected Evidence: Protect in-field trees One study evaluated the effects of protecting in-field trees on butterflies and moths. The study was in Sweden. COMMUNITY RESPONSE (1 STUDY) Richness/diversity (1 study): One replicated, site comparison study in Sweden found that where more trees and trees of more species had been retained in pastures, butterfly species richness was higher, but richness was lower when a high proportion of those trees were large. POPULATION RESPONSE (0 STUDIES) BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3978https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3978Thu, 18 Aug 2022 10:40:32 +0100Collected Evidence: Collected Evidence: Plant more than one crop per field (intercropping) One study evaluated the effects on butterflies and moths of planting more than one crop per field. The study was in Malaysia. COMMUNITY RESPONSE (1 STUDY) Community composition (1 study): One replicated, site comparison study in Malaysia found that smallholdings planted with oil palm and other crops did not differ in butterfly community composition from those planted with oil palm alone. Richness/diversity (1 study): One replicated, site comparison study in Malaysia found that smallholdings planted with oil palm and other crops did not have greater butterfly species richness than those planted with oil palm alone. POPULATION RESPONSE (1 STUDY) Abundance (1 study): One replicated, site comparison study in Malaysia found that smallholdings planted with oil palm and other crops did not have higher overall butterfly abundance than those planted with oil palm alone. BEHAVIOUR (0 STUDIES)Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3983https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3983Sat, 20 Aug 2022 19:18:11 +0100
What Works 2021 cover

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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