Crematogaster ashmeadi

Mayr, 1886

acrobatic ant, Ashmead's Acrobat Ant

Crematogaster ashmeadi, commonly known as the acrobat , is a strictly ant to eastern North America and widespread in the Southeastern United States. It is the most arboreal ant in pine forests of the coastal plains of northern Florida, where colonies inhabit chambers in the outer bark of living pine trees. The species exhibits specialized nesting , relying on pre-existing cavities excavated by bark-mining rather than constructing its own galleries. are known for their distinctive trail-laying behavior using tibial gland secretions and have been observed raiding nests.

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Pronunciation

How to pronounce Crematogaster ashmeadi: /ˌkrɛmətoʊˈɡæstər æʃˈmiːdaɪ/

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Identification

Crematogaster ashmeadi can be distinguished from other Crematogaster by its strictly habits and association with pine forests in the southeastern United States. Like other members of the , possess a characteristic -shaped that can be raised over the when alarmed, a that gives acrobat their . Specific morphological characters distinguishing C. ashmeadi from require examination by a .

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Habitat

Strictly ; nests and forages almost exclusively above ground level in treetops and on lianas. In northern Florida, colonies inhabit chambers in the outer bark of living pine trees, specifically utilizing cavities abandoned by bark-mining ( ). Newly-mated preferentially found colonies in abandoned galleries in dead branches of longleaf pine (Pinus palustris) saplings. Also associated with epiphytic ghost orchids (Dendrophylax lindenii) in Florida.

Distribution

Widespread in the Southeastern United States; most abundant in the coastal plains of northern Florida, particularly the Apalachicola National Forest. to eastern North America as one of eleven Crematogaster in the region. Distribution extends from the southeastern states westward, with records from Florida pine forests as the best-documented .

Diet

have been observed raiding nests of the Mischocyttarus mexicanus and foraging on their . Specific dietary breadth beyond this observation is not documented.

Host Associations

Dendrophylax lindenii - mutualistCrematogaster ashmeadi and tends ghost orchids in Florida, establishing a mutualistic association with this epiphytic orchid
Cossidae - commensalRelies on chambers bored by bark-mining of this for nesting; does little to no excavation of its own

Life Cycle

Colony founding occurs when newly-mated disperse and select abandoned galleries in dead branches of longleaf pine saplings. Queen settlement shows clumped among trees, indicating non-random selection of suitable founding sites. First-year survival of incipient colonies is low at 7.6%. Over the course of the first year, dispersion changes from clumped to random, possibly due to aggressive between incipient colonies.

Behavior

scent trails from the tibial gland when returning to the nest from food sources, dragging their hind legs with pressed against the substrate. Trail-following is highly developed and -specific, enabling recruitment of nestmates to resources. Exhibits aggressive with and heterospecific incipient colonies, which likely contributes to its dominance in pine forest . Has been observed raiding nests.

Ecological Role

in longleaf pine of northern Florida, where it influences structure through aggressive with other ants. Acts as a mutualist with ghost orchids, potentially providing protection against . Serves as a of . Its reliance on pre-existing cavities may influence patterns of cavity use by other arboreal organisms.

Similar Taxa

Crematogaster laeviusculaBoth are Crematogaster in eastern North America; C. laeviuscula has been documented as a of nests (Polistes exclamans), similar to the -nest raiding observed in C. ashmeadi. Differentiation requires morphological examination and context.

More Details

Nesting Strategy

Crematogaster ashmeadi is unusual among in its near-complete reliance on pre-existing cavities rather than excavating its own nest chambers. This dependence on abandoned galleries in pine bark represents a specialized nesting strategy that may limit its distribution to areas where suitable cavities are available.

Colony Dominance Mechanism

Research suggests that C. ashmeadi achieves dominance in longleaf pine forests through a combination of early of available nesting sites and aggressive , rather than through superior competitive ability at established food resources.