Biogeography and early emergence of the genus<i>Didelphis</i>(Didelphimorphia, Mammalia)
Why this work is in the frame
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Bibliographic record
Abstract
Abstract The genus Didelphis comprises six species of relatively large‐sized New World marsupials ranging from Argentina to Canada. Most of the diversity of the genus occurs in the Neotropical region, where two groups of species are currently recognized: the Didelphis marsupialis group, including D. marsupialis and D. aurita, and the D. albiventris group comprising D. albiventris , D. imperfecta and D. pernigra . The genus also includes D. virginiana, the only living Didelphis species reaching the Nearctic region. Didelphis' wide latitudinal distribution, wide range of environments in which it can be found as well as the disjunct, and spatially complementary distributions shown by its species raise some questions regarding the historical biogeography of the genus and how it relates to the geological and climatic events of the Plio‐Pleistocene. The present study is aimed at answering biogeographic and historical questions concerning the evolution of Didelphis. We employed molecular methods to infer a multi‐locus time‐calibrated phylogeny including all Didelphis species which served as a framework for biogeographic analyses. Our results suggest that the basalmost divergence in Didelphis is an event older than previously thought, probably having taken place at some point between ca. 4.3 and 7.4 Mya following a vicariant event. Our results also suggest a northern South American origin for the genus, and that it possibly expanded its range to North America before the GABI. Climatic‐driven modifications in Neotropical environments during the late Pliocene and early Pleistocene favored the dispersion to new ecosystems triggering the emergence of new lineages.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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 it