The spatiotemporal changes in fish and invertebrate community structure and habitat viability in the Yangtze Estuary
Bibliographic record
Abstract
• MODC reflects the overall average oxygen demand level of the community. • AGIC, the ratio of habitat oxygen supply to community average demand, reflects habitat viability. • Seasonal differences in the Yangtze Estuary’s environment and community structure are significant, without notable interannual changes. • The habitat viability in the southern region of the Yangtze Estuary is lower than in the northern region. • Hypoxia-driven massive outbreaks of Harpadon nehereus and jellyfish occurred. Temperature and oxygen are fundamental environmental factors shaping community structure and are major climatic stressors for marine species globally, interacting with physiological traits of species to establish marine habitats. Periodic seasonal fluctuations in temperature and oxygen significantly influence the composition of community structures and biogeographic habitat viability. This study utilized two community-based indices, the Aerobic Growth Index of the Community (AGIC) and the Mean Oxygen Demand of the Community (MODC), to understand the roles of temperature and oxygen in shaping the community structure of benthic fish and invertebrates during the spring and autumn in the Yangtze Estuary and quantified habitat viability across different seasonal and spatial regions. We observed pronounced seasonal differences in the environmental and community structures of the Yangtze Estuary, though variations in habitat viability across seasons were minimal. Autumn communities demonstrated lower vulnerability and higher resilience to hypoxia. Despite this, from 2004 to 2022, the annual fluctuations in temperature, oxygen levels, and habitat viability were minimal, maintaining high levels overall, except in the spring of 2004. Additionally, influenced by the Taiwan Warm Current, the southern region of the Yangtze Estuary exhibited lower habitat viability compared to the northern region. Although AGIC and MODC, as two new ecological indicators, are limited by some uncertainties, it can still provide guidance for future conservation of estuarine ecosystems and sustainable utilization of fishery resources under the ongoing global oxygen crisis.
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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 | 0.001 | 0.001 |
| 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 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".