Accelerated migration of mangroves indicate large-scale saltwater intrusion in Amazon coastal wetlands

Saltwater intrusion can dramatically transform coastal ecosystems, changing vegetation and impacting wildlife and human communities who rely on these natural resources. This phenomenon is difficult to measure over large and remote areas but can be inferred from changes in the distribution of salt-tolerant vegetation, such as mangroves, observable from satellite imagery. The northern coast of Brazil has the largest continuous mangrove forest in the world and very low human occupation. Even so, saltwater intrusion and changes to the coastline have been reported in this region, with potential consequences for mangrove carbon storage and for local livelihoods, but this has not been quantified due to the remoteness of the area. This study measured changes in mangrove distribution along the Northern Brazil coast in the state of Amapá, covering ca. 15,000 km2, over the last 38 years using Landsat satellite imagery. We found that mangrove in this area is highly dynamic, with significant gains and losses occurring over the study period, but with an overall net gain of 157 km2. Mangroves have been systematically expanding inland and this growth has accelerated close to the shoreline and at the head of tidal channels in the last two decades, indicating rapid and large-scale saltwater intrusion in this region. This phenomenon is likely driven by sea level rise, which also accelerated in this region in recent decades, but anthropogenic impacts such as buffalo grazing may also play an important role

Building capacity for climate adaptation planning in protected area management: Options and challenges for World Heritage

"Response and adaptation to the impacts of climate change is a vital and increasing requirement for protected area management. On the ground managers of cultural and natural values in protected places have requested practical guidance on how to undertake climate change impact analysis, vulnerability assessment, and adaptation plan- ning together with enhanced capacity for planning with partners, rightsholders and stakeholders. In this paper we explore how co-development and subsequent testing among World Heritage site managers, Indigenous ex- perts and researchers, produced guidance for assessing, responding to and planning for the impacts of climate change on the diverse values of World Heritage sites in Australia. We draw on the diversity of cultural and natural heritage values associated with the terrestrial, coastal and marine environments in Australian World Heritage sites, and the broad range of institutional contexts in these sites, to highlight considerations of relevance to other protected areas (including other World Heritage sites around the world, Ramsar wetlands and marine protected areas). Our paper highlights that, for climate adaptation planning to become a normal part of man- agement, there is a need for ongoing capacity building, including around the use of climate information to inform adaptation planning and implementation, as well as integrating Indigenous perspectives. Building capacity mayinvolve trial and error, negotiation, sharing, sourcing and interpreting new information, and changes in""expectations. It will require novel and more dynamic relationships between partners and stakeholders. Managers should include capacity building for climate adaptation planning and implementation as a specific climate"adaptation task in their planning.