The life cycle of the pteropod Limacina helicina in Rivers Inlet (British Columbia, Canada)
Bibliographic record
Abstract
The life cycle of Limacina helicina has been continuously debated within the literature. We believe the current lack of consensus regarding fundamental aspects of its life cycle (e.g. seasonal times of spawning, seasonal development of the population size structure, as well as the life cycle longevity) is primarily due to using datasets of low temporal resolution. Using fort-nightly data, two population cohorts were identified using the mixdist statistical package and tracked for more than 400 days, throughout 2008 to 2010. From this, a life cycle longevity of 1.2--1.5 years was estimated for L. helicina in Rivers Inlet. Throughout the seasons, the population size structure showed a continually high presence of the smaller size-groups suggesting continuous spawning, however, based on total densities of > 600 ind.m^-³, the late spring was put forward as the period of peak spawning. Continuous spawning was confirmed with the use of daily data. Identification of a summer peak spawning established late spring and summer as two periods of enhanced spawning, although continuous spawning occurred throughout the season (in a limited fashion). Short-term periods of significant growth were observed prior to peak spawning in late spring and summer. This was not directly coupled with chlorophyll concentrations, possibly due to the time lag between periods of high chlorophyll biomass and zooplankton response. Attempts were made to estimate the instantaneous mortality of L. helicina, and the seasonal changes experienced from spring to summer. Our estimates were complicated by a combination of 1.) inherent patchiness of L. helicina, 2.) advection, and 3.) merged recruits. Generally, there were no cases of significant mortality throughout the seasons however, short term mortality was observed after peak spawning. It is plausible that the smallest size-groups of L. helicina experiences the highest mortality after peak spawning. Our findings show that in Rivers Inlet, L. helicina has a life cycle spanning 1--1.5 years with spring and summer peak spawning activities. The spring cohort is likely spawned by the summer cohort from the previous year. It utilizes the spring phytoplankton bloom to reach sexual maturity and spawn the summer cohort.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".