Aceituno tree with name stone
| Scientific name(s) | Simarouba amara (related species: Simarouba glauca) |
| Local name | Aceiteuno |
| Possible age | 40–60 years |
| Full grown height | 10–25 m depending on soil and rainfall |
| Growth speed | Medium to fast |
| Food source for | Fruit‑eating birds, bats, small mammals |
| Flowering | Mainly dry season (approx. January–March) |
| Fruit season | Late dry to early rainy season (approx. March–June) |
| Special feature | Oily fruits; rough bark hosting insects; broad canopy creating cool microhabitats |
| Ecological significance | Supports frugivores and insectivores; stabilizes microclimate; accelerates forest regeneration |
The Oil‑Fruit Tree That Feeds the Forest
Simarouba amara, widely known in Costa Rica as Aceiteuno, produces small, oily drupes that are exceptionally rich in energy. These fruits ripen in clusters and attract a wide variety of frugivores, including tanagers, toucans, fruit bats, and small mammals. Because the fruits often appear during seasonal gaps when other species produce little, Aceiteuno becomes a crucial resource that helps wildlife bridge the “hungry months” of the dry season.
A living microhabitat from trunk to crown
The bark of Aceiteuno is rough and fissured, creating countless hiding places for insects. Ants, beetles, moth larvae, and spiders use these crevices as shelter, forming a miniature ecosystem that supports lizards and insect‑feeding birds such as flycatchers and woodcreepers.
The tree’s broad, compound leaves cast deep shade, cooling the forest floor and stabilizing humidity. Amphibians — especially frogs and small toads — retreat into these shaded pockets during the hottest hours of the day. Ground‑dwelling mammals also benefit from the moderated microclimate, which helps maintain moist leaf litter and healthy soil organisms.
A powerful ally in reforestation
Aceiteuno plays a valuable role in ecological restoration:
- Shade provider: Its canopy protects young seedlings of slower‑growing native species
- Wildlife attractor: Animals feeding on its fruits disperse seeds of many other forest plants, accelerating natural regeneration
- Soil stabilizer: Its root system reduces erosion on former cattle pastures
- Microclimate regulator: By cooling and shading the ground, it creates conditions that allow more sensitive species to return
A sign of a forest coming back to life
As Aceiteuno matures, it becomes a hub of activity: birds feeding at dawn, bats visiting at night, insects crawling along its bark, and amphibians resting in its shade. In reforestation landscapes, the presence of Aceiteuno is often one of the first indicators that wildlife is returning — a clear sign that the forest is healing.
Sources
- Pennington & Sarukhán. Árboles Tropicales de México – botanical and ecological information
- Hammel, B.E. et al. Manual de Plantas de Costa Rica – notes on Simarouba amara
- Studies on frugivory and seed dispersal in Central American secondary forests
- Field observations from reforestation projects in Central America
Avocado