Yukon River Inconnu: Biology, distribution, and migration
Bibliographic record
Abstract
ABSTRACT Objective Inconnu Stenodus leucichthys are widely distributed throughout the Yukon River drainage from its headwaters in Canada to its mouth at the Bering Sea in western Alaska, United States. Population-level details, including spawning origins, migrations, age structure, and anadromous tendencies, have only recently been explored. The advent of several new technologies over the past 30 years, including those associated with radiotelemetry, genetics, and otolith aging and chemistry, has expanded our understanding of Inconnu migration patterns, population structure, longevity, anadromy, and more. Here, we review and synthesize recent research efforts on Inconnu within the Yukon River in Alaska. Methods Radiotelemetry studies were used to identify Inconnu migration patterns and to locate spawning areas in the Yukon River in Alaska. Subsequent population-specific sampling efforts were then conducted to collect length and weight data, tissue for genetic analyses, and otoliths for aging and chemistry analyses. These data were used to describe demographic qualities, growth patterns, anadromous tendencies, and population-specific survival estimates for Yukon River Inconnu. Results Six spawning areas—three that had not been previously identified—were located in the Alaskan portion of the Yukon River drainage. Consecutive-year spawning occurred for some individuals, most commonly from populations with the greatest tendency for anadromy. Genetic relationships among populations indicated two major groupings separated by spawning area distance from the sea. Otolith chemistry studies suggested variable levels of anadromous tendency among populations as far as 1,700 km from the sea, including individuals that migrate between salt water and freshwater annually and those that remain in freshwater throughout life. Age structure data from some populations revealed significant differences in annual survival, possibly due to different levels of exploitation. Conclusions These findings indicate that while populations of Inconnu in the Yukon River occupy many of the same habitats seasonally, they experience different life history patterns, which may result from spawning area locations that influence anadromous tendencies, spawning frequency, exposure to exploitation or predation, longevity, and survival.
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.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".