Trans-Pacific shipboard trials on planktonic communities as indicators of open ocean ballast water exchange
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 350:41-54 (2007) - DOI: https://doi.org/10.3354/meps07016 Trans-Pacific shipboard trials on planktonic communities as indicators of open ocean ballast water exchange Michael D. Taylor1,*, Lincoln M. MacKenzie1, Timothy J. Dodgshun1, Grant A. Hopkins1, Eykolina J. de Zwart1, Carlton D. Hunt2 1Cawthron Institute, 98 Halifax Street East, Private Bag 2, Nelson 7042, New Zealand 2 Battelle, 397 Washington Street, Duxbury, Massachusetts 02332, USA *Email: mike.taylor@cawthron.org.nz ABSTRACT: A trans-Pacific voyage from Japan to New Zealand via Singapore was used to assess planktonic (and sediment-dwelling) communities as indicators of open ocean ballast water exchange (BWE). The research was part of a larger project to develop methods for verifying whether international shipping has complied with mandatory controls and voluntary BWE guidelines. The dilution efficiency of exchanges was compared with changes in the composition and abundance of ballast tank phyto- and zooplankton taxa. Changes in the planktonic communities were measured by sampling the source port, the ballast water at the source and recipient ports and immediately before and after BWE, and the open ocean water during exchanges. Although exchanges appeared relatively effective at reducing the abundance (90 to 100%) of phyto- and zooplankton indicator taxa (i.e. taxa in the ballast water uploaded from the source port that were not present in open ocean samples or were present at <0.001 the original concentration), such reductions must be considered in the light of variation in survivorship in the control tank. Relatively high rates of mortality were associated with a rapid warming (i.e. 14.0 to 27.8°C) of the exchanged and control ballast tanks as the vessel entered the tropics. The rapid decline in the abundance of indicator taxa after BWE contrasted with a less effective reduction (i.e. 30.3 and 25.0% for the first and second exchanges, respectively) in the total number of phyto- and zooplankton taxa. Management controls and guidelines should place greater emphasis on whether the water uploaded during BWE is sufficiently oceanic to minimise the risk of uploading harmful coastal organisms. KEY WORDS: Ballast water exchange · Tracer dye · Phytoplankton · Zooplankton · Sediment-dwelling species · Biological indicators · Open ocean · Trans-Pacific voyage Full text in pdf format PreviousNextCite this article as: Taylor MD, MacKenzie LM, Dodgshun TJ, Hopkins GA, Zwart EJd, Hunt CD (2007) Trans-Pacific shipboard trials on planktonic communities as indicators of open ocean ballast water exchange. Mar Ecol Prog Ser 350:41-54. https://doi.org/10.3354/meps07016 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 350. Online publication date: November 22, 2007 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2007 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 | 0.003 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.043 | 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".