Coexistence, distribution patterns and habitat utilization of the sibling species complex Eurytemora affinis in the St Lawrence estuarine transition zone
Bibliographic record
Abstract
Eurytemora affinis is the dominant copepod in the St Lawrence estuarine transition zone (ETZ). The distribution patterns of two co-occurring genetically divergent clades of E. affinis were analyzed. The Atlantic (A) and the North-Atlantic (NA) clade occurrences were spatially and temporally variable. Three and five distinctive habitats were found in June and August 2010, respectively. The habitats in the upper and the middle ETZ were predominantly defined by SPM characteristics such as particulate organic matter, chlorophyll a and protists while, in the lower ETZ, water mass properties such as nutrients, salinity and temperature were responsible for habitat differentiation. In June, the NA clade occurred throughout all habitats whereas, in August, it was mostly restricted to the middle and lower ETZ. The A clade was absent in June and was found in similar densities in the upper and middle ETZ in August. Associated with these habitats, distinct zooplankton assemblages were found, dominated numerically by at least one of the two clades, except in the most downstream habitat where Acartia spp. occurred in higher densities. Highest densities of the NA clade coincided with high food quantity and quality in the middle ETZ, whereas the A clade was equally abundant in the upper and the middle ETZ. Thus, we suggest that distribution patterns of the E. affinis clades were probably controlled by food source conditions and ‘clade-specific’ physiological tolerances, resulting in either spatial or temporal segregation or in coexistence of both clades in some of the habitats along 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 | 0.000 |
| 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".