Collected Evidence: Collected Evidence: Physically or chemically remove oilWe found no studies that evaluated the effects, on vegetation, of physically or chemically removing oil (but not vegetation) from contaminated marshes or swamps.   ‘We found no studies’ means that we have not yet found any studies that have directly evaluated 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%2Fwww.conservationevidence.com%2Factions%2F3173https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3173Tue, 06 Apr 2021 13:40:33 +0100Collected Evidence: Collected Evidence: Cut or burn oil-contaminated vegetation: freshwater marshesWe found no studies that evaluated the effects, on vegetation, of cutting or burning oil-contaminated vegetation in freshwater marshes.   ‘We found no studies’ means that we have not yet found any studies that have directly evaluated 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%2Fwww.conservationevidence.com%2Factions%2F3174https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3174Tue, 06 Apr 2021 13:40:59 +0100Collected Evidence: Collected Evidence: Cut or burn oil-contaminated vegetation: brackish/salt marshes Two studies evaluated the effects, on vegetation, of cutting or burning oil-contaminated vegetation in brackish/salt marshes. One study reviewed multiple cases from the UK and the USA. The other study was in Brazil. VEGETATION COMMUNITY   VEGETATION ABUNDANCE Overall abundance (1 study): One review of studies in oil-contaminated salt marshes in the UK and the USA reported that in eight of eight cases with quantitative comparisons between cut and uncut areas, cutting had no clear benefit for vegetation abundance (density, biomass or cover) over 8–29 months of recovery. Individual species abundance (1 study): One replicated, paired, controlled, site comparison study in oil-contaminated brackish/salt marshes in Brazil found that smooth cordgrass Spartina alterniflora density and biomass were never greater in cut than uncut plots (and typically similar under each treatment), over nine months after cutting. VEGETATION STRUCTURE Height (1 study): One replicated, paired, controlled, site comparison study in oil-contaminated brackish/saline marshes in Brazil found that smooth cordgrass Spartina alterniflora was never taller in cut than uncut plots (typically similar height under each treatment) over nine months after cutting. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3175https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3175Tue, 06 Apr 2021 13:41:15 +0100Collected Evidence: Collected Evidence: Cut or burn oil-contaminated vegetation: freshwater swampsWe found no studies that evaluated the effects, on vegetation, of cutting or burning oil-contaminated vegetation in freshwater swamps.   ‘We found no studies’ means that we have not yet found any studies that have directly evaluated 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%2Fwww.conservationevidence.com%2Factions%2F3176https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3176Tue, 06 Apr 2021 13:41:35 +0100Collected Evidence: Collected Evidence: Cut or burn oil-contaminated vegetation: brackish/saline swampsWe found no studies that evaluated the effects, on vegetation, of cutting or burning oil-contaminated vegetation in brackish/saline swamps.   ‘We found no studies’ means that we have not yet found any studies that have directly evaluated 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%2Fwww.conservationevidence.com%2Factions%2F3177https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3177Tue, 06 Apr 2021 13:41:47 +0100Collected Evidence: Collected Evidence: Stimulate microbial breakdown of oilWe found no studies that evaluated the effects, on vegetation, of stimulating microbial breakdown of oil in contaminated marshes or swamps.   ‘We found no studies’ means that we have not yet found any studies that have directly evaluated 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%2Fwww.conservationevidence.com%2Factions%2F3178https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3178Tue, 06 Apr 2021 16:11:08 +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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