Aquatic Biotas of Sundaland Are Fragmented But Not Refugial
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Tropical insular systems have long attracted biologists, stimulating some important controversies in ecology and evolution. Eustatic fluctuations during the Pleistocene have been invoked to explain species dispersal and proliferation in these fragmented systems by controlling the extent of landmasses and their temporary connections. In ancient archipelagos, the Pleistocene represents only a small slice of their history, so long-standing configurations might better explain insular diversity patterns. With a geological history of ca. 30 million years, the Sunda Shelf is old. Upon entering the Pleistocene, islands of the Sunda Shelf repeatedly separated and merged; however, recent reappraisals of its paleoenvironments and evolutionary dynamics have questioned their biogeographic significance. Based on the molecular inventory of 6 common freshwater fish families, we explored population fragmentation and demographic history of the most common species using mitochondrial DNA sequences. Species delimitation methods, applied to 1062 sequences belonging to 37 species from 188 sites, detected 95 Molecular Operational Taxonomic Units (MOTUs). Among the 9 most widespread species, the number of MOTUs ranged from 1 to 11, and correlated with time to the most recent common ancestor. Extended Bayesian Skyline Plots applied to mitogenomes and cytochrome c oxidase I sequences detected no variation in past effective population size within MOTUs, while hierarchical Approximate Bayesian Computation provided no evidence of congruent changes in effective population sizes. Fragmentation of an ancestral range is the most likely explanation for the rampant cryptic diversity observed, but demographic inferences do not support MOTUs as being refugial from an evolutionary perspective.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.000 | 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