Conservation Evidence: Evidence Data

Collected Evidence: Collected Evidence: Add water to marshes or swamps to compensate for droughtWe found no studies that evaluated the effects, on vegetation, of adding water to marshes or swamps to compensate for drought. ‘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%2F3180https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3180Tue, 06 Apr 2021 16:13:02 +0100Collected Evidence: Collected Evidence: Build barriers to protect littoral freshwater marshes from rising water levels and severe weatherWe found no studies that evaluated the effects, on vegetation, of building barriers to protect littoral freshwater marshes from rising water levels and severe weather. ‘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%2F3181https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3181Tue, 06 Apr 2021 16:13:34 +0100Collected Evidence: Collected Evidence: Build barriers to protect littoral brackish/salt marshes from rising water levels and severe weather Five studies evaluated the effects, on vegetation, of building barriers to protect littoral brackish/salt marshes from rising water levels and severe weather. Three studies were in the USA, one was in Italy and one was in the Netherlands. VEGETATION COMMUNITY Overall extent (3 studies): Two controlled studies (one also replicated, randomized, paired) in Italy and the USA found that protecting salt marshes with offshore structures had no significant effect on the seaward limit of emergent vegetation, after 17–27 months. It was similar, or retreated at a similar rate, in protected and unprotected marshes. One replicated, randomized, paired, controlled study in the USA found that brackish marshes protected with oyster shell reefs receded less, over one year, than unprotected marshes. Community composition (1 study): One replicated, site comparison study in the Netherlands reported that marshes protected with low sea walls had a similar overall plant community composition to nearby natural salt marshes, 15–22 years after the walls were built. Overall richness/diversity (2 studies): One controlled study in Italy reported that a salt marsh protected with an offshore fence contained more plant species, after 17 months, than an unfenced marsh. One replicated, site comparison study in the Netherlands recorded 85 plant and algal species across two salt marshes that had developed behind low sea walls, over 15–22 years, compared to 155 species recorded across multiple natural marshes in the region. VEGETATION ABUNDANCE Overall abundance (2 studies): Two controlled studies (one also replicated, randomized, paired) in Italy and the USA found that brackish/salt marshes protected with offshore structures contained a similar total amount of vegetation to unprotected marshes. This was true for cover and biomass. Individual species abundance (2 studies): One replicated, paired, site comparison study in the USA found that salt marshes protected with offshore breakwaters (and planted with cordgrasses Spartina spp.) typically contained less smooth cordgrass S. alterniflora, after 2–3 growing seasons, than nearby natural marshes. One replicated, site comparison study in the Netherlands reported that in marshes protected with low sea walls for 15–22 years and nearby natural salt marshes, the same plant species were the most frequent. VEGETATION STRUCTURE Height (1 study): One replicated, paired, site comparison study in the USA found that salt marshes protected with offshore breakwaters (and planted with cordgrasses Spartina spp.) contained shorter smooth cordgrass S. alterniflora plants, after 2–3 growing seasons, than nearby natural marshes. Collected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3182https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3182Tue, 06 Apr 2021 16:13:45 +0100Collected Evidence: Collected Evidence: Build barriers to protect littoral freshwater swamps from rising water levels and severe weatherWe found no studies that evaluated the effects, on vegetation, of building barriers to protect littoral freshwater swamps from rising water levels and severe weather. ‘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%2F3183https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3183Tue, 06 Apr 2021 16:13:55 +0100Collected Evidence: Collected Evidence: Build barriers to protect littoral brackish/saline swamps from rising water levels and severe weatherWe found no studies that evaluated the effects, on vegetation, of building barriers to protect littoral brackish/saline swamps from rising water levels and severe weather. ‘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%2F3184https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3184Tue, 06 Apr 2021 16:14:06 +0100Collected Evidence: Collected Evidence: Designate zones for migration of marshes or swamps as climate changesWe found no studies that evaluated the effects, on vegetation, of designating zones for migration of marshes or swamps under climate change. ‘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%2F3185https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3185Tue, 06 Apr 2021 17:10:15 +0100Collected Evidence: Collected Evidence: Restore/create freshwater marshes in areas that will be climatically suitable in the futureWe found no studies that evaluated the effects, on vegetation, of restoring or creating freshwater marshes in areas expected to be climatically suitable in the future. ‘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%2F3186https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3186Tue, 06 Apr 2021 17:10:52 +0100Collected Evidence: Collected Evidence: Restore/create brackish/salt marshes in areas that will be climatically suitable in the futureWe found no studies that evaluated the effects, on vegetation, of restoring or creating brackish/salt marshes in areas expected to be climatically suitable in the future. ‘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%2F3187https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3187Tue, 06 Apr 2021 17:11:12 +0100Collected Evidence: Collected Evidence: Restore/create freshwater swamps in areas that will be climatically suitable in the futureWe found no studies that evaluated the effects, on vegetation, of restoring or creating freshwater swamps in areas expected to be climatically suitable in the future. ‘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%2F3188https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3188Tue, 06 Apr 2021 17:11:23 +0100Collected Evidence: Collected Evidence: Restore/create brackish/saline swamps in areas that will be climatically suitable in the future One study evaluated the effects, on vegetation, of restoring or creating brackish/saline swamps in areas expected to be climatically suitable in the future. The study was in South Africa. VEGETATION COMMUNITY Overall extent (1 study): One before-and-after study in an estuary in South Africa reported that over 42 years after planting mangrove trees just beyond their current range, the area of mangrove forests increased. VEGETATION ABUNDANCE VEGETATION STRUCTURECollected Evidencehttps%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3189https%3A%2F%2Fwww.conservationevidence.com%2Factions%2F3189Tue, 06 Apr 2021 17:11:31 +0100