Heat-induced mass mortality of invasive zebra mussels (<i>Dreissena polymorpha</i>) at sublethal water temperatures
Bibliographic record
Abstract
We observed a massive die-off of zebra mussels (Dreissena polymorpha) on the epilimnetic sediments of Gull Lake (Michigan, USA) during the relatively warm summer of 2010, even though water temperatures were below widely reported lethal temperatures of ≥30 °C. We followed up this observation with 4 years of in situ monitoring of caged mussels stocked across a depth–temperature gradient in Gull Lake. Mortality of caged D. polymorpha was largely explained by accumulated degree hours >25 °C, a temperature threshold that is considerably lower than laboratory-derived lethal temperatures for D. polymorpha. We also assessed both the acute and chronic thermal tolerance of Gull Lake D. polymorpha with laboratory experiments, which confirmed higher acute tolerance (up to 32 °C) under otherwise ideal conditions but high susceptibility to prolonged exposure to “sublethal” temperatures (exceeding 1700 degree hours >25 °C) as occurred in Gull Lake during the die-off. Our results indicate that the thermal tolerance of D. polymorpha under natural conditions may be lower than has been reported from laboratory studies. Lower temperature tolerance may have major implications for the dynamics, impacts, and management of this invasive species given future climate change scenarios.
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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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".