Differences in the trophic role of Mysis diluviana in two intermontane lakes
Bibliographic record
Abstract
The trophic role of the freshwater shrimp Mysis diluviana was compared between 2 neighbouring lakes in British Columbia to investigate its possible role in the collapse of the Okanagan Lake kokanee salmon Oncorhynchus nerka population.Stable isotopes of nitrogen (δ 15 N) and carbon (δ 13 C) were used to compare the trophic relationships of mysids within the pelagic food web and between lakes.Mid-summer δ 15 N signatures suggested that adult mysids in Okanagan Lake were acting more as primary consumers, and Kalamalka Lake mysids were acting as secondary consumers.M. diluviana's predatory capacity was also assessed through in situ clearance rate feeding experiments and examination of gut contents.M. diluviana <1 yr old in Okanagan Lake were capable of clearing a greater volume of prey, but there was no difference between lakes for M. diluviana >1 yr old.Gut contents confirmed M. diluviana in both lakes were consuming copepod and cladoceran prey.All 3 techniques demonstrated ontogenetic diet shifts, with larger mysids obtaining more energy from zooplankton prey.Although mysids in feeding experiments actively consumed the same zooplankton prey as kokanee, δ 15 N and δ 13 C ratios suggest that mysids in Okanagan Lake were not feeding at the same trophic level as kokanee, which indicates that there may have been less competition for food sources than previously thought.These differences in results suggest that predatory capacity, as indicated by in situ feeding experiments or gut content analysis, should not be used in isolation to establish trophic roles for omnivorous animals.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".