Temak

Description

Shorea is a genus of about 196 species of mainly rainforest trees in the family Dipterocarpaceae. The genus is named after Sir John Shore, the governor-general of the British East India Company, 1793–1798. The timber of trees of the genus is sold under the common names lauan, luan, lawaan, meranti, seraya, balau, bangkirai, and Philippine mahogany. Shorea spp. are native to Southeast Asia, from northern India to Malaysia, Indonesia, and the Philippines. In west Malesia and the Philippines, this genus dominates the skyline of the tropical forests. The tallest documented tropical angiosperm is an 88.3-m-tall Shorea faguetiana in the Tawau Hills National Park, in Sabah on the island of Borneo, and in that park at least five other species of the genus have been measured to be over 80 m tall: S. argentifolia, S. gibbosa, S. johorensis, S. smithiana, and S. superba Borneo is also the hotspot of Shorea diversity with 138 species, of which 91 are endemic to the island. The majority of Shorea spp. are general flowering species, which is an event that occurs at irregular intervals of 3–10 yr, in which nearly all dipterocarp species together with species of other families bloom heavily. General flowering is thought to have evolved to satiate seed predators and/or to facilitate pollination.Both explanations apparently hold merit. Flowering is thought to be triggered by droughts that occur during transition periods from La Niña to El Niño.The magnitude of a flowering event is suggested to be dependent on the timing of the droughts associated with the El Niño southern oscillation (ENSO) cycle, with the largest events occurring after an interval of several years with no flowering. Shorea spp. are insect pollinated and a variety of insects have been implicated, with species within the sections of Shorea sharing the same insect pollinators. Flowering within a section is sequential within one habitat and species association to prevent competition for pollinators. Seed predation and mortality have an impact on the reproduction process of dipterocarps such as Shorea. In Singapore, crab-eating macaque and moth larvae are known seed predators.