Semi-annual spawning in marine scallops strengthens larval recruitment and connectivity on Georges Bank: a model study
Bibliographic record
Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 516:209-227 (2014) - DOI: https://doi.org/10.3354/meps10975 Semi-annual spawning in marine scallops strengthens larval recruitment and connectivity on Georges Bank: a model study K. T. A. Davies1,*, W. C. Gentleman1, C. DiBacco2, C. L. Johnson2 1Department of Engineering Mathematics and Internetworking, Dalhousie University, 1340 Barrington St., Halifax, NS B3J 1Y9, Canada 2Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS B2Y 4A2, Canada *Corresponding author: kim.davies@dal.ca ABSTRACT: Sea scallops Placopecten magellanicus on Georges Bank in the northwest Atlantic exhibit semi-annual spawning phenology, where the autumn spawn is dominant and the spring spawn is smaller and more variable. The spring spawn is thought to contribute little to total annual larval settlement on the Bank because fecundity is lower, larval development is slower and off-Bank transport is higher during spring. We tested the hypothesis that larval settlement during spring is negligible compared to autumn by incorporating spatially and temporally explicit information about spawning and larval mortality into a coupled biological-physical larval tracking model to investigate dispersal and connectivity during each spawning period. To accomplish this, we assimilated field data on adult density-at-size and seasonal fecundity-at-size as initial conditions into the model. We discovered that larval production varied in time (spring production on the Bank is half that of autumn) and space (spawners are concentrated along the advective pathway of the along-Bank gyre). Particle settlement and connectivity was reduced, but not negligible, during spring compared to autumn due to stronger dispersal off-Bank and into uninhabitable areas during spring. When mortality was made constant in space and time, lower larval production combined with slower growth during spring resulted in a minimal contribution of the spring spawn to annual settlement. When mortality was correlated with environmental variation in time and space, the spring spawn contributed up to one-third of the total annual larval settlement between the immediate upstream-downstream connected aggregations. We conclude that the spring spawn can make a substantial contribution to total annual larval production, and that settlement on Georges Bank and should be given more attention in field studies. Larval mortality has a strong influence on settlement during spring and autumn, and future field studies should focus on quantifying space and time variation in mortality in relation to the environment. KEY WORDS: Sea scallop · Placopecten magellanicus · Georges Bank · Connectivity · Larval tracking model Full text in pdf format Supplementary material PreviousNextCite this article as: Davies KTA, Gentleman WC, DiBacco C, Johnson CL (2014) Semi-annual spawning in marine scallops strengthens larval recruitment and connectivity on Georges Bank: a model study. Mar Ecol Prog Ser 516:209-227. https://doi.org/10.3354/meps10975 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 516. Online publication date: December 03, 2014 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2014 Inter-Research.
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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 | 0.000 |
| 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 | 0.003 |
| 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 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".