Trace metal content in sediment cores and seagrass biomass from a tropical southwest Pacific Island

A unique feature of seagrass among other ecosystem services is to have high phytoremediation potential that is a cost-effective plant-based approach and environmentally friendly solution for metal contamination in coastal areas. The goal of this study was to assess the phytoremediation prospective of seagrass for Cu, Fe, Mn and Zn in Fiji Islands. Heavy metal content was measured in sediments and tissues of the seagrasses Halophila ovalis, Halodule pinifolia and Halodule uninervis to test for local-scale differences. The local study shows that metal concentration in sediment and seagrass tissue was significantly variable, regardless of species and sediment type. Sedimentary concentration of Cu, Fe, Mn and Zn obtained in the present study seemed to be lower than that of previous studies. The results support that H. ovalis is a good bioindicator species since it accumulated up to 5-fold more of these metals compared to the Halodule species

Agriculture under a changing Climate

The agriculture sector in PICs is critically important for food security and livelihoods at the household, community, national, and regional levels. Climate change is already impacting and will continue to impact agriculture in both the short and long term. PICs need to transform the agriculture sector for it to remain prominent and relevant in Pacific communities. There is a need for the agriculture sector in PICs to become resilient to the negative impacts of climate change while simultaneously increasing production to feed a growing population. In addition, there is a need to reduce the negative environmental impacts of unsustainable agriculture on soil, waterways, and the atmosphere (through the release of greenhouse gas emissions). Agricultural transformation can be achieved in PICs through focusing on a systems-oriented perspective that recognizes the foundational importance of healthy soils. Opportunities exist to strengthen existing partnerships and forge new ones to address information and resourcing constraints

Building the Evidence Base on Community Food Production Initiatives in Pacific Island Countries

Poor dietary diversity, low consumption of fruits and vegetables, and an increasing reliance on relatively expensive, processed and imported foods high in fat, salt and sugar, are linked to the triple burden of malnutrition. Under-nutrition, overweight and obesity, and micronutrient deficiencies are challenging food and nutrition systems in PICs. Between 40 and 80% of adults are overweight and obese and approximately 15-25% suffer from type 2 diabetes in the region (IDF, 2017 and NCD Risk Factor Collaboration, 2016). These prevalence rates are among the highest recorded globally. Related to this, adults in PICs have a high probability of premature mortality from non-communicable diseases (NCDs). Depending on the PIC, between one in six to one in four women, and one in four to over one in three men, will die from an NCD before their 70th birthday (WHO, 2018). In the seven InnovAg4Pacific project countries, death rates attributable to poor nutrition are around three to seven times higher than in New Zealand. A fifth to a third of all deaths in these countries are attributable to poor nutrition

Policy Brief 2: Building Community Resilience

Building resilience in Ocean Cities of the Pacific region is key to converting challenges and risks communities face into opportunities for systemic transformation toward sustainable development. Island settlements at the nexus of ocean health, climate change and urban development will need to build anticipatory, adaptive, absorptive and transformative capacity in the face of complex stressors. The interlinked challenges and resource constraints in rapidly growing Ocean Cities in the Pacific means that the ability to absorb shocks and bounce back relevant partners and stakeholders to promote equitable opportunities for all people in urban communities to access resources and use them sustainably, and to apply standardized methods contextualized for the Pacific to assess the relative vulnerability of communities in Ocean Cities. It also recognizes the importance of promoting stronger governance regimes within urban communities, aligning these with the policies of local government, and encouraging partnerships between urban and rural communities. This second policy brief in the Ocean Cities series offers guidance in this direction

Blue carbon storage in Fijian seagrass meadows: First insights into carbon, nitrogen and phosphorus content from a tropical southwest Pacific Island

Seagrasses provide vital ecosystem services which include the accumulation and storage of carbon and nutrients in sediments and biomass. Despite their importance in climate change mitigation and adaptation, seagrass ecosystems have been poorly studied, particularly in the Pacific. Therefore, the present study assessed variability in sedimentary and vegetative C, N and P storage in three monospecific seagrass meadows (Halophila ovalis, Halodule pinifolia and Halodule uninervis), reporting baseline data for the first time. Sediment Corg stocks ranged from 31 to 47 Mg C ha−1 and varied (p < 0.001) between seagrass meadows, unvegetated areas and locations. Comparison of N and P storage between vegetated meadows and unvegetated areas revealed differences (p < 0.05); implying seagrass meadows function as C, N and P sinks. Differences in species composition and environmental conditions, may play a key role in estimating C, N and P stocks, which are valuable data for conservation and monitoring of seagrass ecosystems

Evaluation of decision support system for agrotechnology transfer SUBSTOR potato model (v4.5) under tropical conditions

Decision Support System for Agrotechnology Transfer (DSSAT) SUBSTOR Potato model (v4.5) was calibrated using Desiree variety. DSSAT SUBSTOR Potato model simulates on a daily basis the development and growth of potatoes using inputs such as climate, soil and crop management. The experiment was conducted in Banisogosogo, Fiji Islands, during the potato growing season of 2012. Fresh and dry weights of belowground plant component (tubers) were taken during progressive harvests. The DSSAT SUBSTOR Potato model was calibrated using experimental field data, soil and weather data of the growing season. The manual calibration steps involved recalculation of soil water content and the adjustments of genetic co-efficient to suit the temperature and daylength regime similar to the experimental conditions. Tuber dry weight was used as the main parameter to evaluate the model. The R2 values of the observed and simulated model outputs before calibration for replicate plot 1, replicate plot 2 and replicate plot 3 were 0.52, 0.49 and 0.61 respectively. After calibration, the R2 values for tuber dry yield for replicate plot 1, replicate plot 2 and replicate plot 3 were 0.88, 0.66 and 0.92 respectively indicating a strong positive relationship between the simulated and the observed yield