Differential short‐ and long‐term effects of an invertebrate predator on zooplankton communities in invaded and native lakes
Bibliographic record
Abstract
Abstract Aim Forecasting the effects of invasive species remains difficult, because short‐term effects may be transitory and theories of long‐term effects are poorly developed and rarely tested. Here, we compare zooplankton communities from freshwater lakes in Norway and Canada that differ in their duration of exposure to the invertebrate predator Bythotrephes longimanus, to aid in predicting its potential long‐term impacts on Canadian zooplankton communities. Location Freshwater lakes in Canada and Norway. Methods We compared differences in zooplankton community structure, richness and occurrence between lakes with and without Bythotrephes in Canada and Norway using univariate and multivariate analyses of the incidence of crustacean zooplankton species. Results Correspondence analysis confirmed that zooplankton community composition differed dramatically in lakes with and without Bythotrephes in Canada but not in Norway. The short‐term exposure of Canadian lakes to Bythotrephes led to lower zooplankton diversity, particularly for cladoceran species, whereas in Norway, a greater diversity of zooplankton, particularly for copepod species, occurred in lakes where Bythotrephes has been present for long periods. Significantly more species in Norway demonstrated an increase in their frequency of occurrence, while significantly more species in Canada demonstrated a decrease, in lakes containing Bythotrephes. Main conclusions Bythotrephes can modify zooplankton community structure, diversity, and spatial occurrence across a watershed in a short period (i.e. a few decades) after invasion; however, some species appear to adapt to the presence of Bythotrephes over time. We hypothesize the long‐term effects of higher diversity in Norwegian lakes is attributed to altered interspecific community interactions, coupled with behavioural adaptations to avoid Bythotrephes predation, enabling the remaining species to increase their populations in space and time. If Canadian communities adapt similarly, the long‐term effects of Bythotrephes invasion in Canada may thus be less severe than those observed in the first few decades of the invasion.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 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".