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Costa Rica, Nicaragua.
Acromyrmex volcanus is common in mature wet forest on the Atlantic slope of Costa Rica, occurring from sea level to about 1000m elevation. It is one of the most common and conspicuous attines in lowland primary forest, giving way to Atta in second growth and more open habitats.
At La Selva Biological Station, A. volcanus workers forage on the ground but nests are arboreal. When I first encountered the species in 1985, I was mystified by the large workers cutting fallen flowers on the forest floor and carrying them up tree trunks. Later, while climbing a tall Pentaclethra tree at La Selva, I was standing in the first major fork, 20m above the forest floor, when Acromyrmex workers suddenly appeared around my feet. I found a basketball-sized nest, with a large fungus garden, embedded in the accumulated canopy soil beneath the epiphyte layer in the fork. Subsequent observations by Wetterer and others have repeatedly confirmed the arboreal nesting habits at La Selva, but at elevations above 500m A. volcanus nests at ground level (Wetterer, pers. comm.). Wetterer (1993) reports quantitative data on the foraging and nesting ecology of A. volcanus at La Selva.
Wetterer, J. K. 1993. Foraging and nesting ecology of a Costa Rican leaf-cutting ant, Acromyrmex volcanus. Psyche 100:65-76.
Found most commonly in these habitats: 13 times found in montane wet forest, 8 times found in rainforest, 4 times found in tropical wet forest, 3 times found in 2º lowland rainforest, 4 times found in wet forest, 3 times found in mature wet forest, 1 times found in Primary forest at river edge, 2 times found in lowland rainforest, 1 times found in tropical rainforest, 1 times found in Primary wet forest, ...
Found most commonly in these microhabitats: 3 times strays, 4 times Malaise trap, 1 times ground nest, 2 times column on ground, 2 times ground foragers, 2 times nocturnal strays, 1 times nest under epiphytes in canopy, 1 times harvesting carrion bait, 2 times ex sifted leaf litter, 1 times at bait, 1 times Workers carrying cut leaves, ...
Collected most commonly using these methods: 13 times search, 10 times Malaise, 3 times hand collecting, 1 times Baiting, 2 times Sweeping, 2 times flight intercept trap, 2 times Foggin, 1 times Foso, 1 times miniWinkler, 1 times observation, 1 times FIT, ...
Elevations: collected from 5 - 1610 meters, 416 meters average
Collect Date Range: collected between 1980-09-20 and 2020-02-15