Response of bull trout (<em>Salvelinus confluentus</em>) to habitat reconnection through replacement of hanging culverts with bridges
Bibliographic record
Abstract
We examined the effectiveness of road culvert replacement on providing access to fish habitat in two tributary streams of the Torpy River, in central British Columbia. For both study streams, culverts had been “hanging” at the downstream end, which created waterfalls to the streambed below. To facilitate fish passage upstream, culverts were replaced with steel bridges. In one of the streams, fish movement extended above the culvert. Benthic invertebrate and fish communities, and stream channel physical characteristics were assessed before and after replacing the culverts. Physical characteristics and the benthic invertebrate communities were similar for the two study streams. The primary species found in both streams was bull trout (Salvelinus confluentus), with rainbow trout (Oncorhynchus mykiss) comprising less than 3% of the total fish captured. Before culvert removal, fish were absent above the road in one of the streams. The presence of young-of-the-year fish 2 years after bridge construction, however, indicated that bull trout had colonized and spawned in the reconnected habitat within 1 year. The relative abundance of bull trout in the stream where access was not restricted by the culvert did not differ over the 4 years of the study. Conversely, abundance and year-class structure of bull trout improved in the stream where habitat above the road was reconnected. Our findings indicate that removal of hanging culverts to allow fish passage is an effective management approach to increase available fish habitat.
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How this classification was reachedexpand
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 | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".