Worldwide spread of Roger's dacetine ant, Strumigenys rogeri (Hymenoptera: Formicidae)
Bibliographic record
Abstract
Strumigenys rogeri EMERY, 1890 (Subfamily Myrmicinae, Tribe Dacetini) is a very small ant (total length ~ 2.5 mm) that nests in and under dead wood and preys on tiny soil arthropods. Strumigenys rogeri has spread to many parts of the world through human commerce. However, because S. rogeri workers are so small and slow moving, and they become motionless when disturbed, most people, including field biologists, remain unaware of their presence. To examine the spread of S. rogeri, I compiled specimen records from > 400 sites worldwide. I documented the earliest known S. rogeri records for 67 geographic areas (countries, island groups, major Caribbean islands, US states, and Canadian provinces), including many areas for which I found no previously published records: Antigua, Austral Islands, Barbados, British Virgin Islands, Comoro Islands, Grenada, Guadeloupe, Iles Eparses, Martinique, Nevis, Palau, Philippines, St Kitts, St Lucia, St Martin, and Tanzania. Strumigenys rogeri apparently originated in tropical Africa, where its closest relatives all live, but it has become widespread on tropical islands of the Indo-Pacific and the West Indies, and in peninsular Florida. Outside of Africa and Florida, there are only a small number of continental records of S. rogeri, including a few from South and Central America and just one from continental Asia, in peninsular Malaysia. It is unclear whether S. rogeri has not yet spread to these continental areas, whether continental ants have competitively excluded S. rogeri, or whether these ants have been simply overlooked in surveys of diverse continental faunae. There is little information on what impact S. rogeri may be having on the native mesofauna in its exotic range.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".