Large Intraspecies Variation in Stable Isotope Composition of the Muscle Tissues in Fish of the Genus <i>Cyprinion</i> (cyprinidae) from Middle East
Bibliographic record
Abstract
Significant individual variation of nitrogen and carbon isotope composition (δ 15 N and δ 13 C values) in white muscle tissues was found in samples of three cyprinid fish species, Cyprinion macrostomus (periphytonophage), Cyprinion kais (benthophage), and Luciobarbus schejch (omnivore), collected in a small tributary of the upper Tigris system (Turkey). In particular, exceptionally low value (1.7‰) and abnormally wide intraspecific variability (from 1.7 to 15.8‰) of δ 15 N were observed in C. macrostomus . Despite samples were collected synchronously and syntopically, very broad range of δ 15 N values points out possible heterogeneity of the samples. The studied watercourse is located in the zone of agriculture with intensive chemicalization and pollution of the river by mobile forms of nitrogen (mostly ammonium) could play a significant role in lowering δ 15 N values, especially in the periphytonophage. Along with that, fish with high (normal) δ 15 N values are supposedly recent migrants that came from a large river for joint spawning with resident fish. The pollution of water bodies as well as the presence of migrations should be taking into account in stable isotope analyses-based studies on trophic ecology of fishes.
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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 | 0.000 | 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".