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Background. Mine waste from abandoned mining sites can cause environmental degradation and ecological imbalance to receiving water bodies. Heavy metal pollution affects local communities and may pose health risks to the general public. An abandoned mining facility in Marinduque, Philippines, situated on the of Mogpog River, continuously deposits mine wastes, which may affect the river and the health of local communities. Objectives. The aim of the present study was to examine the presence and extent of heavy metal contamination from mine wastes in the aquatic ecosystem of the Mogpog River by determining the level of heavy metal concentration in the water, sediments and biota. Methods. Four sampling sites were monitored for heavy metals (copper (Cu), arsenic (As), chromium (Cr) and sulfur (S)) pollution. Several analyses were conducted to determine the heavy metals present in the water, sediment and biota. Atomic absorption spectrophotometry was used for the analysis of Cu concentrations in water. X-ray fluorescence was used for the analysis of total heavy metals in the sediments and biota. Results. An inverse relationship with water and sediment from upstream to downstream of the river were observed. This trend shows deposition of Cu in the sediments as factored by pH. Flora gathered from the riverbanks recorded concentrations of Cu in their leaves and fruits. Conclusions. It has been difficult for the Mogpog River to regain water quality after years of mine waste deposition. Acid mine drainage occurred upstream of the river which affects the speciation of heavy metals. The potential risk of heavy metal exposure to local communities was observed due to the communities' river utilization. Participant Consent. Obtained Ethics Approval. The Office of Vice Chancellor for Research and Extension of University of the Philippines Los Baños approved the study Competing Interests. The authors declare no competing financial interests.

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The study identified permaculture practitioners and determined how network relationship patterns can help in the mainstreaming of permaculture in the Philippines. Social network analysis was conducted to determine network structure and discover relationship patterns. Results of the study identified 204 permaculture practitioners with 75 individuals belonging to 53 projects that fall under nine project types. This is the first systematic documentation of practitioners in the Philippines. The network structure had a low density (0.185598) suggesting the high diversity of members in its network composition. Degree centrality index (max=92) revealed the network's prominent practitioners while local clustering coefficient (max=0.999) identified the presence of eight organizations and local government offices implying that membership was not limited to the participation of individuals. In conclusion, the way the permaculture network was constructed gave it a strategic position to mainstream permaculture to a broader audience which includes farmers and non-farmers.