Differences in the trophic role of Mysis diluviana in two intermontane lakes
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Bibliographic record
Abstract
AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 5:281-292 (2009) - DOI: https://doi.org/10.3354/ab00162 Theme Section: Advances in the ecology of freshwater mysids THEME SECTION Differences in the trophic role of Mysis diluviana in two intermontane lakes John D. Whall1, David C. Lasenby2,* 1Watershed Ecosystems Program, and 2Department of Biology, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada *Corresponding author. Email: dlasenby@trentu.ca ABSTRACT: The trophic role of the freshwater shrimp Mysis diluviana was compared between 2 neighbouring lakes in British Columbia to investigate its possible role in the collapse of the Okanagan Lake kokanee salmon Oncorhynchus nerka population. Stable isotopes of nitrogen (δ15N) and carbon (δ13C) were used to compare the trophic relationships of mysids within the pelagic food web and between lakes. Mid-summer δ15N signatures suggested that adult mysids in Okanagan Lake were acting more as primary consumers, and Kalamalka Lake mysids were acting as secondary consumers. M. diluviana’s predatory capacity was also assessed through in situ clearance rate feeding experiments and examination of gut contents. M. diluviana <1 yr old in Okanagan Lake were capable of clearing a greater volume of prey, but there was no difference between lakes for M. diluviana >1 yr old. Gut contents confirmed M. diluviana in both lakes were consuming copepod and cladoceran prey. All 3 techniques demonstrated ontogenetic diet shifts, with larger mysids obtaining more energy from zooplankton prey. Although mysids in feeding experiments actively consumed the same zooplankton prey as kokanee, δ15N and δ13C ratios suggest that mysids in Okanagan Lake were not feeding at the same trophic level as kokanee, which indicates that there may have been less competition for food sources than previously thought. These differences in results suggest that predatory capacity, as indicated by in situ feeding experiments or gut content analysis, should not be used in isolation to establish trophic roles for omnivorous animals. KEY WORDS: Mysis relicta · Mysis diluviana · Stable isotopes · Trophic position · Okanagan Lake · Clearance rates Full text in pdf format PreviousNextCite this article as: Whall JD, Lasenby DC, (2009) Differences in the trophic role of Mysis diluviana in two intermontane lakes. Aquat Biol 5:281-292. https://doi.org/10.3354/ab00162 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 5, No. 3. Online publication date: May 29, 2009 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2009 Inter-Research.
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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 | 0.000 | 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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