Mangrove management practices, policies, and impacts in New Guinea

Mangrove forests of the island of New Guinea are some of the largest and most diverse in the Asia-Pacific region. Located across Indonesia and Papua New Guinea, these forests are relatively undisturbed compared to the surrounding regions. However, mangroves here face rising pressures by coastal development (aquaculture, agriculture, and settlements) and natural resource extraction (forestry, oil and gas exploration, and unsustainable fishery practices). This study synthesises the current state of mangroves and compares differences in management practices and policies between Indonesian New Guinea and Papua New Guinea. Through a Driver-Pressure-State-Impact-Response framework analysis, we found that peripheral or watershed drivers such as logging upstream, agriculture (including oil palm), oil and gas, and mining, could cause substantial pressure on the mangroves. In Indonesia, there are rigid policies and practices regulating each driver. However, overlapping, and contradicting regulations often do not acknowledge other land uses within the same area, which limits policy implementation. Papua New Guinea's coastal regulations encounters similar difficulties, with additional issues of delegating decision making to local administrations. Management practices such as national scale emissions accounting and Integrated Coastal Zone Management plans need to prioritize regulating the peripheral and internal drivers to maintain mangrove ecosystem services. Challenges for implementation include fragmented management, scarce capacity building and lack of data for decision making. Sustained funding for local coordination among managing agencies and data collection is key for a successful mangrove management. •New Guinea mangrove management was analysed by literature review, DPSIR framework.•Policies in New Guinea rarely include peripheral threats to the mangrove ecosystem.•Settlements, resource extraction in mangrove peripheries are current threats.•A seascape approach regulating ecosystem services, mangrove peripheries recommended.