Conservation Evidence: Evidence Data

Collected Evidence: Collected Evidence: Protect in-field trees We found no evidence for the effects of protecting in-field trees on bird populations. 'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action.Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F184https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F184Sun, 10 Jun 2012 12:59:35 +0100Collected Evidence: Collected Evidence: Plant in-field trees We found no evidence for the effects of planting in-field trees on bird populations. 'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action.Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F185https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F185Sun, 10 Jun 2012 13:00:27 +0100Collected Evidence: Collected Evidence: Tree pollarding and tree surgery We found no evidence for the effects of tree pollarding and tree surgery on bird populations. 'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F186https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F186Sun, 10 Jun 2012 13:01:16 +0100Collected Evidence: Collected Evidence: Plant wild bird seed or cover mixture All seven studies (based on five replicated experiments and a review) that investigated species richness or diversity were from the UK and found that fields or farms with wild bird cover had higher bird diversity than those without, or that more species were found in wild bird cover than in surrounding habitats. Thirty-two studies out of 33 from the UK and North America that examined abundance and population data, found that bird densities, abundances, nesting densities or use of wild bird cover was higher than in other habitats or management regimes, or that sites with wild bird cover had higher populations than those without. These studies included a systematic review and seven randomised, replicated and controlled studies. Some studies found that this was the case across all species or all species studied, while others found that only a subset showed a preference. Four studies investigated other interventions at the same time. Thirteen of the 33 studies (all replicated and from Europe and the USA), found that bird populations or densities were similar on wild bird cover and other habitats, that some species were not associated with wild bird cover or that birds rarely used wild bird cover. Three studies from the UK and Canada, two replicated, found higher productivities for some or all species monitored on wild bird cover, compared to other habitats. Two replicated and controlled studies from Canada and France found no differences in reproductive success between wild bird cover and other habitats for some or all species studied. Three studies from Europe and the USA investigated survival, with two finding higher survival of grey partridge Perdix perdix released on wild bird cover or of artificial nests in some cover crops. The third found that survival of grey partridge was lower on farms with wild bird cover, possibly due to high predation. Five studies from the UK, three replicated, found that some wild bird cover crops were preferred to others. A randomised, replicated and controlled study and a review from the UK found that the landscape surrounding wild bird cover and their configuration within it affected use by birds. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F187https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F187Sun, 10 Jun 2012 13:10:33 +0100Collected Evidence: Collected Evidence: Protect bird nests using electric fencing One before-and-after study from the UK found an increase in tern numbers after the erection of an electric fence, whilst a study from the USA found an increase in the number of nests. Five studies from the USA found higher survival or productivity at wader or seabird colonies with electric fencing, compared to areas without fencing, although one study found that hatching rates were no different, whilst nesting success was only higher in one of two years. One study from the USA found lower predation by mammalian predators inside electric fence exclosures, whilst predation by birds was higher. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F188https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F188Wed, 13 Jun 2012 16:59:40 +0100Collected Evidence: Collected Evidence: Plant nectar flower mixture/wildflower strips for birds Two replicated and controlled studies from the UK (one randomised) and a European review out of seven studies captured found that more birds used nectar/wildflower strips than crops or land under other management. Two studies of a replicated and controlled experiment in the UK found that no more birds used nectar/wildflower strips in winter than used land under other management. A replicated, controlled study from Switzerland found that Eurasian skylarks Alauda arvensis were more likely to nest in patches of fields sown with annual weeds than in crops, and were less likely to abandon nests in these patches. A randomised, replicated and controlled study from the UK found that field margin management affected their use by birds more than the seed mix used on them. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F189https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F189Sat, 16 Jun 2012 19:33:52 +0100Collected Evidence: Collected Evidence: Create uncultivated margins around intensive arable or pasture fields for birds A replicated, controlled study from the USA found that three sparrow species found on uncultivated margins were not found on mown field edges. A replicated study from Canada found fewer species in uncultivated margins than in hedges or in trees planted as windbreaks. Three replicated studies from the USA and UK, one controlled, found that some birds were associated with uncultivated margins, or that birds were more abundant on margins than on other habitats. One study found that these effects were very weak. Four replicated studies (two of the same experiment) from the UK, two controlled, found that uncultivated margins contained similar numbers of birds in winter, or that several species studied did not show associations with margins. A replicated, controlled study from the UK found that yellowhammers Emberiza citrinella used uncultivated margins more than crops in early summer, but use fell in uncut margins in late summer. Cut margins however, were used more than other habitat types late in summer. A replicated study from the UK found high rates of survival for grey partridge Perdix perdix released in margins. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F190https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F190Sat, 16 Jun 2012 19:47:53 +0100Collected Evidence: Collected Evidence: Plant grass buffer strips/margins around arable or pasture fields for birds One replicated controlled study from the USA found that there were more species in fields bordered by margins than unbordered fields. Two replicated studies from the UK, one with paired sites, found no effect of field margins on species richness. A replicated, controlled study from the UK found that more birds and more species used sown strips in fields than the fields themselves, but even more used field margins. Nine studies from the UK and USA, seven replicated, two controlled, found more positive population trends, higher populations or strong habitat associations for some or all species for sites with grass margins to fields. One study investigated multiple interventions. Three replicated studies from the UK found that grass field margins did not have a positive effect on populations of some or all bird species investigated. Both studies that examined habitat use (one replicated, both from the UK) found that species used margins more than other habitats. A randomised, replicated and controlled study from the UK found that birds used cut margins more than uncut margins during winter but less than other management regimes during summer. The authors argue that management type is more important than the seed mix used to sow the margins. A replicated study from the UK found that grey partridge Perdix perdix had smaller broods in grass margins than other habitat types. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F191https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F191Wed, 27 Jun 2012 16:39:04 +0100Collected Evidence: Collected Evidence: Use mowing techniques to reduce chick mortality A review from the UK found a large increase in corncrake Crex crex populations in the UK following a scheme to delay mowing and promote corncrake-friendly mowing techniques. One replicated controlled study from the UK and a review from the UK found lower levels of mortality of corncrakes and Eurasian skylark Alauda arvensis when wildlife-friendly mowing techniques were used, compared to other techniques. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F192https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F192Wed, 27 Jun 2012 17:30:44 +0100Collected Evidence: Collected Evidence: Leave refuges in fields during harvest A replicated study in France found that fewer gamebirds came into contact with mowing machinery when refuges were left in fields than when they were not left. A review from the UK found that Eurasian skylarks Alauda arvensis did not nest at higher densities in uncut refuges than in the rest of the fields. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F193https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F193Wed, 27 Jun 2012 17:35:08 +0100Collected Evidence: Collected Evidence: Mark nests during harvestA replicated study from the Netherlands found that northern lapwing Vanellus vanellus nests were less likely to be destroyed when they were marked, compared to when they were not. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F194https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F194Wed, 27 Jun 2012 17:39:00 +0100Collected Evidence: Collected Evidence: Relocate nests at harvest time to reduce nestling mortalityA replicated controlled study from Spain found that clutches that were temporarily removed from fields during harvest and then replaced had higher hatching and fledging rates than control clutches. Effects were greater on clutches that were older when moved. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F195https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F195Wed, 27 Jun 2012 17:41:59 +0100Collected Evidence: Collected Evidence: Offer per clutch payment for farmland birds One of two replicated and controlled studies from the Netherlands found that farms with per clutch payments held slightly higher breeding densities of waders, but not higher overall numbers than control farms. One study found no population effects over three years. A replicated and controlled study found higher hatching success on farms with payment schemes than control farms. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F196https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F196Wed, 27 Jun 2012 17:50:57 +0100Collected Evidence: Collected Evidence: Control scrub on farmlandA replicated study from the UK found a negative relationship between the number of young grey partridge Perdix perdix per adult and a combined intervention of scrub control, rough grazing and the restoration of various semi-natural habitats. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F197https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F197Wed, 27 Jun 2012 17:55:08 +0100Collected Evidence: Collected Evidence: Take field corners out of managementA replicated study in the UK found that overwinter survival of grey partridge Perdix perdix was higher where field corners were taken out of management than on other sites for one of three winters. There was no relationship with the intervention and brood size, the ratio of young to old birds or density changes. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F198https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F198Wed, 27 Jun 2012 17:57:04 +0100Collected Evidence: Collected Evidence: Reduce conflict by deterring birds from taking crops using bird scarers A controlled paired study in the USA found reduced levels of damage to almond orchards when American crow Corvus brachyrhynchos distress calls were broadcast, compared to the previous year. There were no decreases in control orchards. A replicated study in Pakistan found that four pest species were less abundant when reflector ribbons were hung above crops, compared to when ribbons were not used. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F199https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F199Thu, 28 Jun 2012 11:34:06 +0100Collected Evidence: Collected Evidence: Reduce conflict by deterring birds from taking crops using repellentsA replicated, randomised and controlled ex situ study in the USA found that dickcissels Spiza americana consumed less rice if it was treated with two repellents, compared to controls. Two other repellents did not reduce consumption as effectively. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F200https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F200Thu, 28 Jun 2012 11:40:17 +0100Collected Evidence: Collected Evidence: Increase crop diversity to benefit birdsA before-and-after study in the UK found that more barnacle geese Branta leucopsis used a site after the amount of land used to grow cereals was reduced and other interventions were used. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F201https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F201Thu, 28 Jun 2012 11:43:13 +0100Collected Evidence: Collected Evidence: Use ‘mosaic management’ A replicated, controlled before-and-after study from the Netherlands found that northern lapwing Vanellus vanellus population trends changed from decreases to increases following the introduction of mosaic management. Three other waders did not show such a response. A replicated, paired sites study in the Netherlands found that black-tailed godwits Limosa limosa had higher productivity under mosaic management than other management types, and nests were less likely to be trampled by livestock. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F202https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F202Thu, 28 Jun 2012 11:52:32 +0100Collected Evidence: Collected Evidence: Leave overwinter stubbles The three studies from the UK (one replicated) that report population-level changes found positive effects of over-winter stubble provision, but all investigated multiple interventions at once. Eight studies from the UK, including a systematic review, found that at least some species or groups of farmland birds were positively associated with over-winter stubbles, or were found on stubbles. Three studies investigated multiple interventions without separating the effects of each. Two studies reported that seed-eating birds in particular were more abundant on stubbles. One of the eight studies found that no more positive responses to stubbles were found than would be expected by chance. A replicated, randomised and controlled study from the UK found that 22 of 23 species did not preferentially use stubbles compared to cover crops. A replicated study from the UK found that the area of stubble in a site was negatively related to grey partridge Perdix perdix brood size. Five studies from the UK, four replicated, found that stubble management affected use by birds. Some species or groups were more common on cut stubbles, some on uncut and some showed preferences for barley over wheat. One study found that only Eurasian skylarks Alauda arvensis were more common on stubbles under agri-environment schemes, and only on highly prescriptive schemes. One study found that all seed-eating species were more abundant on stubbles under agri-environment schemes in one of two regions studied. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F203https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F203Mon, 09 Jul 2012 15:13:01 +0100Collected Evidence: Collected Evidence: Plant nettle strips We found no evidence for the effects of planting nettle strips on bird populations. 'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F205https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F205Sun, 15 Jul 2012 17:08:57 +0100Collected Evidence: Collected Evidence: Leave unharvested cereal headlands within arable fields We found no evidence for the effects of leaving unharvested cereal headlands within arable fields on bird populations. 'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F206https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F206Sun, 15 Jul 2012 17:11:46 +0100Collected Evidence: Collected Evidence: Sow crops in spring rather than autumn A replicated, controlled, paired sites study from Sweden found more bird species on areas with spring sown cereals, compared with winter cereals. A before-and-after study from the UK found that several species bred in the study site for the first time after the start of spring sowing. Three studies from Sweden and the UK, two replicated and controlled, found population increases after the start of spring sowing, or higher populations on sites with spring-sown cereals, compared to sites with winter cereals. A before-and-after study from the UK found that ten species did not increase after spring sowing began. No species decreased. A replicated, controlled paired sites study from Sweden found that the benefits of spring-sowing decreased with the proportion of autumn-sown crops in the surrounding area. A replicated, controlled study from Sweden found that hatching success was lower on spring-sown crops than autumn sown. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F207https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F207Sun, 15 Jul 2012 17:16:58 +0100Collected Evidence: Collected Evidence: Undersow spring cereals, with clover for example Three studies from the UK, two replicated, found that there were higher densities of some study species on undersown fields or margins, compared with other fields, or that use of fields increased after they were undersown. One of these (reported in two places) found that not all species nested at higher densities. One replicated study from the UK found that various measures of grey partridge population health declined as the amount of undersown cereal on sites increased. A replicated study from the UK found no relationship between the amount of undersown cereals on a site and the productivity of grey partridge on that site. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F208https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F208Sun, 15 Jul 2012 17:28:25 +0100Collected Evidence: Collected Evidence: Plant more than one crop per field (intercropping)A study from the USA found that 35 species of bird used fields with intercropping, with four nesting, but that productivity from the fields was very low. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F209https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F209Sun, 15 Jul 2012 17:42:11 +0100