ABSTRACT1. Tropical, high islands of the Pacific have developed unique freshwater fish faunas that are currently threatened by a range of human activities. This paper documents distinct differences in life history strategies from fish communities found in streams of Fiji compared with fish assemblages in freshwater systems on larger continental land masses. While river systems of northern Australia and Papua New Guinea have a high proportion of freshwater residents, the Fiji fauna is dominated by amphidromous gobiids that migrate across a broad range of habitats throughout their life cycle.2. The number of amphidromous fish species and the number of all fish species in mid-reaches of Fiji rivers are significantly affected by loss of catchment forest cover and introductions of tilapia (Oreochromis spp.). On average, stream networks with established Oreochromis spp. populations have 11 fewer species of native fish than do intact systems. The fish that disappear are mostly eleotrid and gobiid taxa, which have important dietary and economic value.3. Based on the strong links between catchment land clearing, non-native species introductions and loss of migratory pathways for freshwater fish, spatial information was compiled on a national scale to identify priority areas for conservation in Fiji with intact connectivity between forests, hydrologic networks and coral reefs. Areas with high connectivity included remote, largely undeveloped regions of Vanua Levu (Kubulau, Wainunu, Dama, Udu Point, Natewa, Qelewara) and Taveuni, as well as smaller mapping units (Naikorokoro, Sawakasa) of Viti Levu with low density of roads and high relative amounts of mangroves and reefs.4. These priority areas for conservation can only be effectively protected and managed through cross-sectoral collaboration and ecosystem-based approaches.

D a v i d O l s o n , L i n d a F a r l e y , A l e x P a t r i c k , D i c k W a t l i n g , M a r i k a T u i w a w a V i l i k e s a M a s i b a l a v u , L e m e k i L e n o a , A l i v e r e t i B o g i v a , I n g r i d Q a u q a u J a m e s A t h e r t o n , A k a n i s i C a g i n i t o b a , M o a l a T o k o t a ' a , S u n i l P r a s a d W a i s e a N a i s i l i s i l i , A l i p a t e R a i k a b u l a , K i n i k o t o M a i l a u t o k a C r a i g M o r l e y and T h o m a s A l l n u t t Abstract Fiji's National Biodiversity Strategy and Action Plan encourages refinements to conservation priorities based on analyses of new information. Here we propose a network of Priority Forests for Conservation based on a synthesis of new studies and data that have become available since legislation of the Action Plan in 2001.For selection of Priority Forests we considered minimum-area requirements for some native species, representation goals for Fiji's habitats and species assemblages, key ecological processes and the practical realities of conservation areas in Fiji. Forty Priority Forests that cover 23% of Fiji's total land area and 58% of Fiji's remaining native forest were identified. The analysis confirms the majority of conservation priority areas previously identified, recommends several new areas, and supports the Government of Fiji's policy goal of protecting 40% of remaining natural forests to achieve the goals of the National Biodiversity Strategy and Action Plan and sustain ecosystem services for Fijian communities and economies.

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Watersheds offer opportunities for place-based interventions to transform systems health via preventative versus reactive approaches to management that achieve multiple co-benefits for public and environmental health. The Watershed Interventions for Systems Health in Fiji (WISH Fiji) project embraced participatory knowledge co-production and action-oriented research to identify risks to public and ecosystem health, prioritize interventions to address risks, and monitor responses of the system to interventions. We used screening filters and local knowledge to collaboratively identify five watersheds for action with high prior incidence of water-related diseases (Fiji’s “three plagues” of leptospirosis, typhoid and dengue) and high risk to downstream environmental health. We reviewed literature to identify disease risk factors, evaluated overlaps with risks for downstream environmental impact, and designed 13 instruments to collect information about baseline risk. Following consultations to obtain free, prior and informed consent, we enrolled 311 households across 29 communities. We synthesized data to identify key risks at the household, community, and landscape level, which were communicated to community water and resource management committees and government leaders as part of developing water and sanitation safety plans for each community. Local committees identified 339 priority risk reduction actions across nine main categories: animal management; drainage; health systems surveillance; hygiene; integrated planning; land use management; sanitation systems; waste management; and water systems. As of October 2022, 154 interventions were implemented in the five watersheds across different risk categories and scales. While we can track changes to factors that reduce risk of water-related disease and improve environmental health, direct evaluation of impacts to public health is limited due to poor geolocation of case records. The WISH Fiji project is a model of cross-sectoral coordination that efficiently progresses multiple Sustainable Development Goals, but scaling requires sustained investment in interventions to realize full benefits, particularly for nature-based solutions that exhibit lagged responses.