Almaciga ( Agathis philippinensis Warb.), a tropical conifer that is tapped for its resin commercially known as Manila copal, grows in many parts of the Philippines, but resin buyers prefer and pay a better price for resin from southern Palawan. The study was done to characterize almaciga resins obtained from commercial sites in Davao Oriental and Palawan (Brooke's Point and Marufinas) to explain the quality and price differences. Fresh and aged resin samples were subjected to wet chemical, thermal, and spectral analyses. Generally, the resin samples were found to be soluble in the more polar solvents although significant variations were observed for resins from various sites. Titrimetric determination revealed no significant variation in acid and saponification values, although the Brooke's Point resin had significantly lower unsaponifiable components. Predominant Fourier transform infrared spectroscopy (FTIR) absorption peaks for fresh resin include strong C=O stretch and weak = C–H stretch. Aged Palawan resins, which showed increased solubility in polar solvents, exhibited increased intensity of prominent FTIR peaks such as O–H stretch and C=O stretch. The weak peak at 1719 cm −1 seen in fresh Palawan resins was no longer observed in aged resins. DSC revealed the semi-crystalline nature of almaciga resin and melting temperatures similar to diterpenoid resin acids. This is attributed to the presence of increasing amounts of oxidized abietic acids as shown by gas chromatography-mass spectrometry (GCMS). For the Davao Oriental resins, significant amount of agatholic acid was shown, while resin acids of the abietane and pimarane type were conspicuously absent in the GC-MS spectrograms. The study found evidence that almaciga resins from Davao and Palawan differ in chemical composition and physical properties, which could explain the quality and price differences.

Abstract. Daracan VC, Mendoza RC, Torres AM, Jara AA, Manalo RD, Batallones CHR, Razal RA. 2020. Comparison of Agathis philippinensis resin tapping and collection practices in three selected sites in the Philippines. Biodiversitas 21: 5595-5604. This study documented and compared almaciga (Agathis philippinensis Warb.) resin tapping and collection practices in three sites namely Mt. Hamiguitan, Governor Generoso, Davao Oriental; Mt. Mantalingahan, Brooke’s Point, southern Palawan; and Puerto Princesa Subterranean River National Park, Marufinas, central Palawan. Resin tappers, mostly male belonging to a local organization, were interviewed, and tapping sites were visited. Tapping and collecting A. philippinensis resin is one of the supplemental income sources of the respondents from the three sites. Market influences, and how tappers learned the trade could partly explain the similarities and differences in tapping practices. Discrepancies in selecting trees to be tapped, tools used, type of incisions made on the bark, and how resin was harvested were noted. Differences in resin appearance across sites were observed, and the existence of uncollected and wasted resins clinging to trees or sprawling at its base was found in all sites. Removing dirt from the portion of the stem to be tapped, covering the bark incision with plastic for protection, and contriving handmade resin baskets from plant parts available in the site were some practices found to be worth replicating. On the other hand, there were damaged or dying trees due to the intensity of tapping, the lack of tapping skills, and limited attention given to the health of trees. There is a need for strengthening tappers’ organizations for increased bargaining power to secure better resin price and policy support to prioritize indigenous peoples in tapping into their ancestral domain. Tappers can benefit from cross-visits and other learning opportunities for sharing lessons and experiences to improve tapping practices for better resin quality and higher prices.