Striped Bass Early Life History in the Macrotidal Shubenacadie River
Bibliographic record
Abstract
Abstract This 9‐year study (2008–2016) on the Shubenacadie River estuary in Nova Scotia yielded new insight into the only confirmed nursery habitat for the Bay of Fundy population of Striped Bass Morone saxatilis. In 7 of 9 years, the initial large spawning episode occurred between May 16 and June 1, after the accumulation of 11 to 20 degree‐days above 12°C. Most of the spawning occurred within about 3 weeks in May and June but could run into July. Egg abundance at river kilometer (rkm) 25 (measured from the estuary mouth) exceeded 1,000 eggs/m3 after the largest episodes due to the narrow estuary and high numbers of spawners. The pelagic eggs and prefeeding larvae were passively transported up and down the estuary by the strong tide, their distribution highly dependent on salinity. The salt front defined the upstream boundary of the nursery habitat, with the eggs and larvae normally distributed between 0.15‰ and 15‰ (above rkm 10). The abundance of first‐feeding larvae (5–7 mm TL) in the upper estuary (above rkm 25) was highest (>500/m3) during years when May–June was warm and dry and saltwater intrusion was high (above rkm 32). Heavy rain after spawning was an important lethal factor, limiting saltwater intrusion to rkm 25 and increasing the risk of advection of eggs and larvae into Cobequid Bay. During June, a lack of copepod prey caused larvae to fail to grow, suggesting that starvation is an important lethal factor. Growth from July onwards was limited by temperature but not food: mysids were highly abundant and an important prey for young of the year (>15 mm TL). By late August juvenile mean total length was >9 cm in warm summers but <5 cm in cooler years. Juveniles were widely dispersed in the estuary and Cobequid Bay through September; their apparent abundance each year was poorly related to larvae abundance.
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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 | 0.000 |
| 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 | 0.001 | 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".