Justification
Aglaia rimosa is a tree which naturally grows in primary and secondary forests of various provinces and localities in Taiwan, Province of China, Philippines, Indonesia, Papua New Guinea and the Solomon Islands. It has a relatively large extent of occurrence (EOO) of 6,711,886.393 km² where its prominent geographic distribution indicates its adaptability in various countries. It also considered to have a large total population given its wide distribution. Though details of its population size are currently not known, the species incurs a continuous, slow, but significant decline in area, extent and quality of habitat due to habitat-threatening effects of urbanization, small-scale and large-scale logging operations, shifting agriculture and other unsustainable farming practices, and the over-exploitation of the species. Despite the decline in the EOO, AOO, and quality of habitat, the species was still assessed as Least Concern given the large EOO and the threats are not thought to significantly affect the survival of this species. Conservation both, in situ and ex situ would be an essential initiative in preventing the species from being pushed into any threatened category in the future.
Geographic Range Information
Aglaia rimosa is a small tree that can be found in low to medium elevation primary and secondary forests (Merrill 1923). It has at least 142 localities distributed over Philippines (Cagayan, Isabela, Ifugao, Benguet, Nueva Ecija, Pangasinan, Zambales, Bataan, Aurora, Batangas, Laguna, Quezon, Cavite, Oriental Mindoro, Sorsogon, Negros Occidental, Palawan, Agusan del Norte, Bukidnon, and Davao del Sur), Indonesia (North Maluku, West Papua and Papua), Taiwan, Province of China (Taichung, Yunlin, Kaohsiung, and Taitung), Papua New Guinea (Sandaun, Western Province, East Sepik, Madang, Eastern Highlands, Gulf Province, Morobe, Northern Province, Milne Bay, West New Britain, East New Britain, and New Ireland) and the Solomon Islands (Western Province). It has an extent of occurrence (EOO) of 6,711,886.393 km2 (GBIF 2022). The species is primarily threatened by land conversion and habitat degradation due to commodity driven deforestation, forestry related activities, urbanization, and shifting cultivation (Global Forest Watch 2022).
Population Information
There is no information on the population size of the species. However, a decline is suspected due to continuous loss of primary forests within its distribution range.
Habitat and Ecology Information
Aglaia rimosa is a shrub or small tree that grows to about 2-10 m (Merrill 1910, Elmer 1920). It is common in primary forests at low and medium elevation, ascending to 1,350m. Also it is found in thickets and secondary forests along rivers, sometimes along the seashore on limestone (Merrill 1923).
Threats Information
Aglaia rimosa is primarily threatened by land conversion and habitat degradation brought by commodity-driven deforestation, shifting cultivation, urbanization, and forestry activities such as logging. A significant loss of natural forests due to land use change was reported in its localities based on the analyzed data from the Global Forest Watch (2022). As of 2020, the forest cover lost in the species localities is approximately 40,100 ha in Cagayan, 33,700 ha in Isabela, 6,290 ha in Ifugao, 2,750 ha in Benguet, 5,500 ha in Nueva Ecija, 2,860 ha in Pangasinan, 5,110 ha in Zambales, 1,670 ha in Bataan, 10,300 ha in Aurora, 2,910 ha in Batangas, 7,070 ha in Laguna, 44,200 ha in Quezon, 1,550 ha in Cavite, 21,500 ha in Oriental Mindoro, 4,570 ha in Sorsogon, 7,630 ha in Negros Occidental, 163,000 ha in Palawan, 18,500 ha in Agusan del Norte, 23,800 ha in Bukidnon, 17,200 ha in Davao del Sur, 4,520 ha in North Maluku, 10,800 ha in West Papua, 17,800 ha in Papua, 1,314 ha in Taichung, 5,709 ha in Kaohsiung, 9,170 ha in Sandaun, 3,120 ha in Western Province (Papua New Guinea), 5,000 ha in East Sepik, 9,070 ha in Madang, 968 ha in Eastern Highlands, 2,520 ha in Gulf Province, 5,520 ha in Morobe, 3,010 ha in Northern Province, 2,670 ha in Milne Bay, 4,910 ha in West New Britain, 10,800 ha in East New Britain, 4,660 ha in New Ireland, and 3,090 ha in Western Province (Solomon Islands). Interventions and conservation actions are highly recommended to prevent further tree cover loss and population decline.
Use and Trade Information
It has edible fruits - eaten raw. The thin layer of flesh surrounding each seed is eaten. The dull orange to brown, obovoid fruit is up to 15mm in diameter, containing up to two seeds, each covered by a thin layer of translucent, yellow flesh. The tree is harvested from the wild for local use as a food and source of wood used for local house construction (Useful Tropical Plants Database 2014).
Conservation Actions Information
The species was locally assessed in the Philippine Red List (DAO 2017-11) as OTS or Other Threatened Species (DENR-BMB 2017). The population of the species is protected in situ because of its presence in declared protected areas (PAs) in the Philippines such as Northern Sierra Madre Natural Park, Marcos Highway Watershed Forest Reserve, Talavera Watershed Forest Reserve, Pantabangan-Caranglan Watershed Reservation, Manleluag Spring Protected Landscape, Doña Remedios Trinidad-General Tinio Watershed Forest Reserve, Polilio Watershed Forest Reserve, Mts. Palay-palay-Mataas-na-Gulod Protected Landscape, Mount Makiling Forest Reserve, Mts. Banahaw-San Cristobal Protected Landscape, Northern Negros Natural Park, Cabadbaran Watershed, Mt. Apo Natural Park, Mt. Mantalingahan Protected Landscape. Although these PAs are supported by law, conservation of the species' population is not guaranteed due to several threats which may cause rapid population decline. In addition, it is known in at least four botanic gardens globally as ex situ collections (BGCI 2022). Further inventory and research are needed to account its remaining population size in the wild. This will help in creating a relevant conservation action plan.