Is Lake Erie a resilient ecosystem?
Bibliographic record
Abstract
Lake Erie has a long history of natural and cultural perturbations ranging from glacial origins, arrival of Europeans, exploration-early colonization, degradation, exotic invasion, and phosphorus reduction to its recent recovery. Is Lake Erie a resilient ecosystem responding to phosphorus abatement and exotic invasion? It is believed that Erie was an oligotrophic system when glaciers receded followed by a long period of mesotrophic conditions. It has been classified from mesotrophic to eutrophic ecosystem during the past three decades. In the 1970s the Great Lakes Water Quality Agreement was signed between Canada and the United States and steps were taken to reduce the phosphorus loading to the Great Lakes including Lake Erie. Total phosphorus and chlorophyll a levels in the eutrophic west have dropped from 41 µg L −1 and 13.8 µg L −1 in the 1970s to <20 µg L −1 and 5.6 µg L −1 in the 1990s. Similarly a significant decrease in phytoplankton biomass was recorded from 1970 to 1992 in the western basin. During the same period Diatomeae decreased markedly from 55% to 10% whereas Chlorophyta increased from 8% to 55%. Similar trends were evident in the other biota. Primary production rates in the 1990s were dominated by small sized organisms (picoplankton and nanoplankton) similar to Lake Superior—a pristine oligotrophic ecosystem. Based on several criteria such as reduction of biomass and primary production, high species diversity, decrease of eutrophic and increase of mesotrophic-oligotrophic species and prevalence of picoplankton-nanoplankton, Lake Erie appears to be a rapidly changing and resilient ecosystem altering from eutrophic to meso-oligotrophic conditions. These observations are also supported by the response of other biota such as zooplankton and benthos. For example during 1993 the non-zebra mussel benthic biomass in the western basin had returned to a similar composition observed earlier in 1952 including the recovery of the mayfly. On the other hand eastern basin benthos has not shown the same extent of recovery as the west. Fish community trends are very complex, but the return of the walleye and whitefish in the western and eastern basins respectively are encouraging signs of recovery. The changes observed at various trophic levels are indicative of a meso-oligotrophic environment.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.088 | 0.072 |
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; both teacher heads agree on what is shown here.
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".