Physiological condition and differential feeding behaviour in the cryptic species complex Eurytemora affinis in the St Lawrence estuary
Bibliographic record
Abstract
The cryptic species complex, Eurytemora affinis is an important component of the mesozooplankton of estuarine transition zones (ETZs). In the St Lawrence ETZ, two clades, the Atlantic and the North-Atlantic clades co-occur. However, their distribution along environmental gradients is spatially segregated, potentially because of differential habitat exploitation. In this study, we tested two hypotheses on the geographic disparity of two E. affinis populations, each belonging to one of the clades. First, habitats differ in food composition and availability, and second, each of the two clade populations shows a distinct feeding behaviour, both, influencing their physiological condition. To achieve this goal, we used a fatty acid (FA) approach to determine FA composition of food sources and E. affinis. Its physiological condition was estimated by the concentration of accumulated neutral FAs. Our results revealed that food composition and availability were similar between clade habitats, suggesting that resource conditions did not contribute to the spatial segregation of the two clade populations. The FA composition of both clade populations was characterized by high levels of docosahexaenoic acid and eicosapentaenoic acid, suggesting that they predominantly ingested phytoplankton. However, significantly different FA profiles of the two populations suggested differential feeding behaviour, which may optimize accumulation of energy reserves in relation to their physiological needs. Both clade populations of E. affinis seem to show good physiological conditions, being well adapted to the dynamic environment of the ETZ.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.000 |
| 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".