Possible influences of plasticity and genetic/maternal effects on species coexistence: native<i><scp>G</scp>ammarus fasciatus</i>facing exotic amphipods
Bibliographic record
Abstract
Summary Native species might be able to persist in the face of a detrimental exotic invader by occupying refuge habitats where the exotic is not successful. These refuges might then provide demographic subsidies that enhance persistence of the native species in areas of coexistence with the exotic species. Phenotypic plasticity of the native species could play a critical role in this process by allowing individuals dispersing from refuge to invaded habitats to adaptively modify their phenotypes, thereby enhancing the subsidy. By contrast, locally adapted genetic or maternal differences between native populations could result in fitness disadvantages for dispersers at invaded habitats, thereby reducing the subsidy. We studied phenotypic variation in a native amphipod (Gammarus fasciatus) across ion gradients inLacSt.Louis,Québec,Canada. Ion gradients determine refuge vs. invaded habitats because native amphipods are found in both ion‐poor and ion‐rich habitats, whereas exotic (Echinogammarus ischnus) amphipods are found only in the latter. We tested for plastic vs. genetic/maternal contributions to spatial variation (ion‐rich vs. ion‐poor habitats) in native amphipod fitness components: postmoult calcification, body size, larval survival, time to first reproduction and fecundity. We did so by comparing the following: (i) F0(collected from the wild) individuals between the two habitats – some of which were reared for a time under varying conditions in the laboratory; and (ii) F1(reared in the laboratory for their entire lives) individuals from the two habitats under a variety of water conditions. We found strong plastic effects on postmoult calcification – it was more rapid in ion‐rich water. We found genetic/maternal differences in time to reproduction (almost twice as long in ion‐poor amphipods), fecundity and larval survival (higher in ion‐poor amphipods) in early summer. These plastic effects and genetic/maternal differences are likely to be adaptive. Plasticity and genetic/maternal effects both could influence the efficacy of ion‐poor populations in providing demographic subsidies that aid native persistence at ion‐rich habitats where exotic amphipods are present. These effects could thus have important consequences for native species persistence in the presence of non‐native species.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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 | 0.000 |
| 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 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".