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Flooding imposes significant costs on households and businesses located in the lower Vaisigano catchment area. SOPAC, under the European Development Fund (EDF) project Reducing Vulnerability of Pacific ACP States, has worked with the Government of Samoa to develop the Samoa Flood Management and Action Plan, which identifies actions for government agencies, the private sector, NGOs and communities responsible for flood and floodplain management that can assist in reducing flood risks in Samoa, particularly in the lower Vaisigano catchment area located in Apia, which is subject to frequent flooding.

Prior to this survey, the island nation of Samoa had not been systematically surveyed for freshwater biodiversity despite the clear role of freshwater and the associated biodiversity in providing essential ecosystem services. This report is beginning to address this gap in knowledge in Samoa by presenting the preliminary results from the first of an anticipated series of freshwater surveys and in-field trainings for Samoa with the target organisms being fishes and macro-crustaceans. A two week initial survey and training in the last fortnight of july (2008) was conducted as a collaborative effort led by Wetlands International-Oceania and the Paris National Museum of Natural History and supported by a range of agencies. Materials developed prior to the training and surveys include catchment maps with inferred catchment integrity, a pictorial training and awareness “flashcard” book for common fresh and estuarine fished, identification keys for crustaceans and fishes, two lectures and a CD of compiled material relevant to the identification of taxa and management of freshwater system.

In this report we present the results of a study carried out between May 2004 and May 2005 as a contribution to the Tropical Rivers Inventory and Assessment Project (TRIAP) of Australia's Tropical Rivers Program. The aim was to provide a framework for the analysis of the ecosystem services provided by the wetland and riverine ecosystems of northern Australia. The analyses drew heavily on the conceptual framework provided by the Millennium Ecosystem Assessment (MA) where ecosystem services were defined as 'the benefits people obtain from ecosystems'. These benefits include: provisioning services such as food and water; regulating services such as flood and disease control; cultural services such as spiritual, recreational, and cultural benefits; and supporting services such as nutrient cycling that maintain the conditions for life on earth. The term 'ecosystem services' is now broadly used to encompass what can also be referred to as ecosystem goods and services and/or ecosystem functions and, at times, also environmental services. For the purposes of this report - given that the study was undertaken using the recognised 'function analysis framework' - the terms ecosystem services and functions are considered to be interchangeable unless a distinction is made otherwise.

Mangrove ecosystems are threatened by climate change. We review the state of knowledge of mangrove vulnerability and responses to predicted climate change and consider adaptation options. Based on available evidence, of all the climate change outcomes, relative sea-level rise may be the greatest threat to mangroves. Most mangrove sediment surface elevations are not keeping pace with sea-level rise, although longer term studies from a larger number of regions are needed. Rising sea-level will have the greatest impact on mangroves experiencing net lowering in sediment elevation, where there is limited area for landward migration. The Pacific Islands mangroves have been demonstrated to be at high risk of substantial reductions. There is less certainty over other climate change outcomes and mangrove responses. More research is needed on assessment methods and standard indicators of change in response to effects from climate change, while regional monitoring networks are needed to observe these responses to enable educated adaptation. Adaptation measures can offset anticipated mangrove losses and improve resistance and resilience to climate change. Coastal planning can adapt to facilitate mangrove migration with sea-level rise. Management of activities within the catchment that affect long-term trends in the mangrove sediment elevation, better management of other stressors on mangroves, rehabilitation of degraded mangrove areas, and increases in systems of strategically designed protected area networks that include mangroves and functionally linked ecosystems through representation, replication and refugia, are additional adaptation options.

The Upper Navua River cuts a narrow gorge through the province of Serua in the central highlands of Viti Levu. The Navua River represents Fiji's third largest freshwater drainage. The gorge is approximately 75 meters deep and varies in width from 5 to 25 meters. The Upper Navua Conservation Area (UNCA) encompasses tins never gorge and approximately 58% of die entire catchment area. Lush highland rainforest surrounds the entire drainage and provides a host of botanical cures diat are utilized by die indigenous peoples of the area. The forest, over and associated biodiversity provide die necessary supplies and food required for daily living and a wide range of ecosystem services to the entire catchment area including flood control for lower areas.