Long-term study of gamete release in a broadcast-spawning holothurian: predictable lunar and diel periodicities
Why this work is in the frame
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Bibliographic record
Abstract
Annual and monthly patterns of gamete release by the sea cucumber Isostichopus fuscus \non the coast of Ecuador were studied to determine the proximal spawning cue and variations in \nreproductive output throughout the year. Several hundred newly collected individuals were monitored \nnearly every month for 4 yr. I. fuscus displayed a lunar spawning periodicity: 0.7 to 34.9% of \nindividuals consistently spawned 1 to 4 d after the new moon. Spawning mostly occurred within one \nevening; however, some gamete release was often recorded over 2 to 4 consecutive evenings. Individuals \nmaintained in captivity for several months retained their spawning periodicity and timing \nwith the lunar cycle. Conversely, newly caught individuals that were shaded from the moonlight did \nnot spawn, thus demonstrating the apparent lack of endogenous rhythms and prevalence of lunar \nluminance over other cues (i.e. tidal cycle, fluctuations in barometric pressure). On a spawning night, \nmales typically initiated gamete release around sunset; females spawned just after the peak male \nbroadcast. The percentage of spawning individuals was higher and a greater overlap between male \nand female peak spawning activity was observed during clear conditions compared with overcast \nconditions. The gonads of individuals that did not spawn in a given month showed a variety of maturity \nlevels, including post-spawning, growth and mature gametogenic stages. Hence, the individual \nreproductive cycle is apparently longer than the monthly spawning periodicity observed at the population \nlevel, enabling I. fuscus populations to be reproductive year round.
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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 | 0.000 |
| 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 | 0.001 |
| 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 it