Fractionation of Sediment Phosphorus in Lagoon Porto-Novo (Benin Republic) Revisited: Changes in Phosphorus Fractions and Release as Affected by Seasons and Sampling Sites
Bibliographic record
Abstract
P is a key factor responsible of continental water eutrophication. In lagoon Porto-Novo sediments, it arises from slope basin supplies and biological activity. The present study has the main objective to evaluate phosphorus release rate coming from lagoon sediment, and to analyse the availability of these nutrient fractions. Four sampling point served to take up waters and sediments destined to analyses. The first five centimetres of sediments and waters were used and analyses (sequential extraction method) carried out on fraction 250 µm, lyophilized for phosphorus fractionation. Phosphorus release rate was calculated applying Nürnberg regression equations which have been built from PT concentrations measured in seven Ontario and Connecticut Lake sediments. One-way variance analysis (ANOVA 1) using Dunnett method and Pearson (r) correlation implemented in MINITAB and JMP were applied. Results showed different phosphorus forms inside sediment. These forms were: P-labile, P-Fe, P-Ca, P-Al and P-Org accompanied by P-reside with a rate in mobilizable phosphorus reaching 66.39% PT. P-Org was the most abundant, attaining proportion between 452.6±53.50 µgP/g -2035.4±311.2 µgP/g of dry sediment, consequence of organic matter accumulation from slope basin due to diverse human activities, and animal and plant organic matters present on the watershed. P-Ca is relatively more found in station S1 and S4 in contrast to S2 and S3. Release rate (TL) registered (11,05 mg*m-2*j-1) indicates then that lagoon Porto-Novo is in a more or less advanced degradation state with an internal load estimated by156,03 mg*m-2*saison-1. These results should be helpful for local and national authorities and stakeholders in setting environmental policies regarding phosphorus reduction, particularly that flowing from slope basin.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".