Short-term temporal variation in inshore/offshore feeding and trophic niche of Atlantic salmon Salmo salar off West Greenland
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 610:191-203 (2019) - DOI: https://doi.org/10.3354/meps12841 Short-term temporal variation in inshore/offshore feeding and trophic niche of Atlantic salmon Salmo salar off West Greenland Heather J. Dixon1, J. Brian Dempson2, Michael Power3,* 1Biology Department, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada 2Fisheries and Oceans Canada, Science Branch, St John’s, Newfoundland and Labrador A1C 5X1, Canada 3Biology Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada *Corresponding author: m3power@uwaterloo.ca ABSTRACT: The marine portion of Atlantic salmon Salmo salar L. life history is not well understood, with many populations exhibiting declines in survival and growth linked to changes in the food web. Atlantic salmon of North American origin feed along the coast of West Greenland from August to November and are exposed to a variety of different ecosystems and hydrographic and environmental regimes that affect marine food webs. Here we used stable isotopes to assess the reliance of Atlantic salmon feeding on inshore prey resources and its associated seasonal variation, and examine the correlations of varying inshore resource use with size, condition and trophic niche width. On average, Atlantic salmon relied on inshore resources for 38% of their diet (range of 0-84%). The reliance on inshore prey increased throughout the season, as did size and condition. Although differences between inshore and offshore feeding fish were small, the resulting implications of associated differences in size and condition on subsequent survival and spawning success suggest important biological consequences of feeding habitat choice. The variation in inshore resource isotope values mirrored hydrographic variation and associated changes in prey related to glacial input, frontal zones between inshore and offshore water masses and nutrient input from run-off. Increasing reliance on inshore feeding may be due to a high abundance of spawning capelin Mallotus villosus in the fjords. Omnivory was found to be highest in fish using both the inshore and offshore environments, suggesting a greater diversity of diet in these fish. KEY WORDS: Atlantic salmon · Inshore/offshore feeding · Stable isotopes · Northwest Atlantic · Trophic niche Full text in pdf format PreviousNextCite this article as: Dixon HJ, Dempson JB, Power M (2019) Short-term temporal variation in inshore/offshore feeding and trophic niche of Atlantic salmon Salmo salar off West Greenland. Mar Ecol Prog Ser 610:191-203. https://doi.org/10.3354/meps12841 Export citation Mail this link - Contents Mailing Lists - RSS Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 610. Online publication date: February 01, 2019 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2019 Inter-Research.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".