Juvenile steelhead movements in relation to stream habitat, population density, and body size: consequences for individual growth rates
Bibliographic record
Abstract
Anadromous salmonids can display considerable movement within their natal streams prior to outmigration, reflecting behavioural responses to biotic and abiotic conditions. Here we quantify dispersal and site fidelity in juvenile steelhead (Oncorhynchus mykiss) over four weeks in the fall, their consequences for individual growth rates, and how habitat, density, and individual body size can explain individual movement decisions. Retention rates ranged from 29% to 66% and were greater among yearlings (61%) than subyearlings (31%). Site fidelity in yearlings was best predicted by individual body mass (negative relationship), and site fidelity in both age classes was positively related to pool habitat availability. An experimental increase in density caused depressed growth rates in both age classes, and site fidelity was lower among translocated fish than among individuals originally residing in the manipulated sites. Within control sites, there were no significant consequences of movement for growth rates in either age class. These results show that movement rates can vary in response to local conditions and that growth rates in movers can equal or exceed those of sedentary individuals.
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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 | 0.000 | 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) | 0.001 | 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".