Seasonal and developmental variation in the lipids of <i>Acanthostepheia malmgreni</i> (Amphipoda) from the hyperbenthos of a cold-ocean environment (Conception Bay, Newfoundland)
Bibliographic record
Abstract
Total lipid (TL) and lipid-class composition in Acanthostepheia malmgreni (Crustacea: Amphipoda) from 240 m depth in Conception Bay were determined from samples collected monthly throughout 1999 and 2000. Variation in lipids among life history stages was studied in relation to the reproductive cycle of A. malmgreni and the timing of the major annual sinking event following the spring phytoplankton bloom in April. Total lipid remained relatively constant in first year juveniles [mean 4·4% dry mass (DM)], after which it gradually increased with the first signs of development of sexual characteristics and the sedimentation of spring bloom material in May. Triacylglycerol (TAG) was the dominant neutral lipid in all stages, with phospholipid (PL) the dominant polar lipid. Highest net accumulation of TL and TAG occurred in a group of large age 2+ individuals from October 1998 to May 1999, and in age 1+ immature males and immature females from July to November 2000 (1·4 mg TL month −1 ; 0·8 mg TAG month −1 ). Phospholipid quantities within the population were relatively constant at ≈2% DM. Maximum TL in the population (13% DM) was observed in large adults and some large immature individuals, and significant decreases in both TL and PL were recorded in mature females during the brooding period. This study reveals a dependence of A. malmgreni on seasonal lipid accumulation for reproduction, and a clear trophic link between the amphipod population and the pelagic production cycle.
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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 | 0.001 | 0.001 |
| 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 | 0.001 | 0.001 |
| 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".