Conservation Evidence: Evidence Data

Collected Evidence: Collected Evidence: Reprofile/relandscape (before planting)We found no studies that evaluated the effects, on vegetation, of reprofiling/relandscaping before planting emergent marsh/swamp plants. ‘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%2Fconservationevidencejournal.com%2Factions%2F3285https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3285Sat, 10 Apr 2021 17:30:50 +0100Collected Evidence: Collected Evidence: Transplant wetland soil before/after planting non-woody plants: freshwater wetlands Two studies evaluated the effects, on vegetation, of transplanting wetland soil to freshwater wetlands planted with emergent, non-woody plants. One study was in the USA and one was in Canada. VEGETATION COMMUNITY Community composition (1 study): One replicated, site comparison study of created freshwater marshes in the USA found that those amended with marsh soil developed plant communities characteristic of wetter conditions than unamended marshes. Most marshes had also been planted. All were ≥5 years old. Overall richness/diversity (1 study): The same study found that marshes amended with marsh soil had similar (dry season) or lower (wet season) plant species richness and diversity to unamended marshes. Most marshes had also been planted. All were ≥5 years old. VEGETATION ABUNDANCE Overall abundance (1 study): One replicated, site comparison study of created freshwater marshes in the USA reported that amongst planted marshes, adding marsh soil had no significant effect on overall vegetation cover or biomass, after ≥5 years. Characteristic plant abundance (1 study): One replicated, site comparison study of created freshwater marshes in the USA reported that amongst planted marshes, those also amended with marsh soil had greater cover of wetland-characteristic plants than unamended marshes, after ≥5 years. Individual species abundance (1 study): One replicated, randomized, paired, controlled study in freshwater trenches in Canada found that adding peat-rich soil to pots of mine tailings before planting water sedge Carex aquatilis typically increased its above-ground biomass two growing seasons later. VEGETATION STRUCTURE OTHER Survival (1 study): One replicated, randomized, paired, controlled study in freshwater trenches in Canada found that adding peat-rich soil to pots of mine tailings either increased or had no significant effect on survival of planted water sedge Carex aquatilis over two growing seasons. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3320https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3320Sun, 11 Apr 2021 12:33:22 +0100Collected Evidence: Collected Evidence: Transplant wetland soil before/after planting non-woody plants: brackish/saline wetlandsWe found no studies that evaluated the effects, on vegetation, of transplanting wetland soil to brackish/saline wetlands planted with emergent, non-woody plants. ‘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%2Fconservationevidencejournal.com%2Factions%2F3321https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3321Sun, 11 Apr 2021 12:33:42 +0100Collected Evidence: Collected Evidence: Transplant wetland soil before/after planting trees/shrubs: freshwater wetlandsWe found no studies that evaluated the effects, on vegetation, of transplanting wetland soil to freshwater wetlands planted with trees/shrubs. ‘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%2Fconservationevidencejournal.com%2Factions%2F3322https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3322Sun, 11 Apr 2021 12:33:50 +0100Collected Evidence: Collected Evidence: Transplant wetland soil before/after planting trees/shrubs: brackish/saline wetlandsWe found no studies that evaluated the effects, on vegetation, of transplanting wetland soil to brackish/saline wetlands planted with trees/shrubs. ‘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%2Fconservationevidencejournal.com%2Factions%2F3323https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3323Sun, 11 Apr 2021 12:34:00 +0100Collected Evidence: Collected Evidence: Use fences or barriers to protect freshwater wetlands planted with non-woody plants Four studies evaluated the effects, on vegetation, of using fences or barriers to protect freshwater wetlands planted with emergent, non-woody plants. There was one study in each of Canada, the Netherlands, Israel and the USA. VEGETATION COMMUNITY Community composition (1 study): One replicated, site comparison study in the USA found that amongst planted/sown lakeshores, those protected with fences or wave breaks contained different wetland plant communities, after 1–6 years, than those without fences or wave breaks. VEGETATION ABUNDANCE Individual species abundance (1 study): One replicated, controlled study at the edge of a freshwater lake in the Netherlands found that amongst plots planted with lakeshore bulrush Scirpus lacustris, those from which wildfowl had been excluded contained a greater density and biomass of lakeshore bulrush, after 1–2 years, than those that remained open to wildfowl. VEGETATION STRUCTURE OTHER Survival (2 studies): Two replicated, paired, controlled studies in freshwater wetlands in Canada and Israel reported that protecting emergent herbs, with silt screens or herbivore fencing, increased survival rates over 12–18 months after planting. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3328https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3328Sun, 11 Apr 2021 13:14:37 +0100Collected Evidence: Collected Evidence: Use fences or barriers to protect brackish/saline wetlands planted with non-woody plantsWe found no studies that evaluated the effects, on vegetation, of using fences or barriers to protect brackish/saline wetlands planted with emergent, non-woody plants. ‘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%2Fconservationevidencejournal.com%2Factions%2F3329https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3329Sun, 11 Apr 2021 13:14:53 +0100Collected Evidence: Collected Evidence: Use fences or barriers to protect freshwater wetlands planted with trees/shrubs Five studies evaluated the effects, on vegetation, of using fences or barriers to protect freshwater wetlands planted with trees/shrubs. Four studies were in the USA and one was in Australia. VEGETATION COMMUNITY VEGETATION ABUNDANCE Tree/shrub abundance (1 study): One replicated, paired, controlled study in a floodplain swamp clearing in the USA found that amongst plots sown with tree seeds, fencing to exclude deer had no significant effect on total tree seedling density after three years. VEGETATION STRUCTURE Height (2 studies): One replicated, paired, controlled study in a floodplain swamp clearing in the USA found that amongst plots sown with tree seeds, those also fenced to exclude deer contained taller tree seedlings, after three years, than those left unfenced. One replicated, paired, controlled study in created freshwater wetlands in the USA found that the average height of white cedar Thuja occidentalis saplings typically increased by a similar amount, between two and five years after planting, in plots fenced to exclude deer and plots left unfenced. OTHER Survival (3 studies): One replicated, paired, controlled study in floodplain swamps in Australia reported that planted swamp gum Eucalyptus camphora seedlings had a much higher survival rate, over one year, in plots fenced to exclude mammals than in open plots. Two replicated, paired, controlled studies in freshwater wetlands in the USA reported that exclusion fencing sometimes increased survival of planted tree seedlings but sometimes had no clear or significant effect. This depended on factors such as the season of planting, seedling elevation, and site. Growth (1 study): One replicated, randomized, controlled study in a nutria-invaded wetland in the USA found that planted baldcypress Taxodium distichum seedlings grew more, over one growing season, when protected than when left unprotected. Plastic guards increased height and diameter growth rates. Sticky, insect-repellent oil increased the growth rate for height, but not diameter. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3330https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3330Sun, 11 Apr 2021 13:15:05 +0100Collected Evidence: Collected Evidence: Use fences or barriers to protect planted brackish/saline wetlands planted with trees/shrubs One study evaluated the effects, on vegetation, of using fences or barriers to protect brackish/saline wetlands planted with trees/shrubs. The study was in the USA. VEGETATION COMMUNITY VEGETATION ABUNDANCE VEGETATION STRUCTURE Height (1 study): One replicated, paired, controlled study in exposed coastal sites in the USA found that red mangrove Rhizophora mangle propagules planted within full-length plastic shelters had grown taller than propagules planted without shelter in three of four comparisons, made 22–129 days after planting. OTHER Survival (1 study): One replicated, paired, controlled study in exposed coastal sites in the USA reported that full-length plastic shelters increased the survival rate of planted red mangrove Rhizophora mangle propagules over 4–8 months, but that full-length bamboo shelters and below-ground plastic shelters had no clear effect on survival. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3331https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3331Sun, 11 Apr 2021 13:15:17 +0100Collected Evidence: Collected Evidence: Remove vegetation that could compete with planted trees/shrubs: freshwater wetlands Five studies evaluated the effects, on trees/shrubs planted in freshwater wetlands, of removing competing plants. Four studies were in the USA. Two of these took place in the same swamp, but with different experimental set-ups. One study was in Australia. VEGETATION COMMUNITY VEGETATION ABUNDANCE VEGETATION STRUCTURE Height (3 studies): Three replicated, controlled studies (two also randomized, two also paired) in a wet meadow in Australia and a degraded swamp in the USA found that clearing vegetation before planting tree/shrub seedlings typically had no clear or significant effect on their height, after 1–4 growing seasons. However, one of the studies in the USA found that planted baldcypress Taxodium distichum seedlings were taller, after three growing seasons, when planted amongst cut woody vegetation than below an uncleared canopy. Diameter/perimeter/area (1 study): One replicated, randomized, paired, controlled study in a wet meadow in Australia found that clearing vegetation, before planting tree/shrub seedlings, typically had no significant effect on the diameter of these seedlings nine months later. OTHER Germination/emergence (1 study): One replicated, randomized, paired, controlled study in a wet meadow in Australia found that there were more seedlings in plots that had been cleared of vegetation before sowing tree/shrub seeds, than in plots that had not been cleared before sowing. Seedlings were counted two months after sowing. Survival (4 studies): Three replicated, controlled studies (two also randomized, two also paired) in a wet meadow in Australia and a degraded swamp in the USA found that clearing vegetation before planting tree/shrub seedlings typically had no clear or significant effect on their survival, after 1–4 growing seasons. However, one of the studies in the USA found that planted baldcypress Taxodium distichum seedlings had a lower survival rate, after three growing seasons, when planted amongst cut woody vegetation than below an uncleared canopy. One replicated, randomized, paired, controlled study in degraded swamps in the USA found that removing reed canarygrass Phalaris arundinacea before planting tree/shrub seedlings never significantly reduced their survival rate over 1–2 growing seasons, and often increased it. Growth (1 study): One replicated, randomized, controlled study in the USA found that baldcypress Taxodium distichum seedlings planted into a marsh grew more in diameter, but less in height, when planted into plots cleared of vines than when planted into uncleared plots. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3334https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3334Sun, 11 Apr 2021 14:09:05 +0100Collected Evidence: Collected Evidence: Remove vegetation that could compete with planted trees/shrubs: brackish/saline wetlandsWe found no studies that evaluated the effects, on trees/shrubs planted in brackish/saline wetlands, of removing competing plants. ‘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%2Fconservationevidencejournal.com%2Factions%2F3335https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F3335Sun, 11 Apr 2021 14:09:29 +0100