Freshwater mussel (Unionidae) timed-search surveys in Medway Creek : the search for Ptychobranchus fasciolaris (Kidneyshell)
Bibliographic record
Abstract
Ptychobranchus fasciolaris (Kidneyshell) is currently listed as Endangered under the federal Species at Risk Act (SARA). There have been numerous shell records of P. fasciolaris in the Thames River watershed but only 4 live individuals found. All live captures have occurred in Medway Creek, a tributary of the North Thames River. In 2024, Fisheries and Oceans Canada (DFO) sampled 15 sites throughout Medway Creek to assess the current unionid assemblage and determine if live P. fasciolaris remain. A semi-quantitative timed-search survey was conducted at each site by a three-to six-person team for a total 4.5 person-hour effort. A total of 1534 live mussels of 14 species, including two species at risk (SAR), Cambarunio iris (Rainbow) and Lampsilis fasciola (Wavyrayed Lampmussel), were observed. There were no live P. fasciolaris individuals found, but 3 whole shells and 2 valves were found at three sites. Medway Creek supports a moderately abundant and highly diverse mussel assemblage; however, there are several pollutant tolerant species and the relative abundance of these species has shifted over time. Sites with P. fasciolaris records (live or shell) have intact riparian buffers of >30 m and water temperature was significantly lower at sites with live SAR present compared to sites without live SAR. These data provide an understanding of the current mussel assemblage in Medway Creek and can be used to inform a potential reintroduction of P. fasciolaris to this system.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".