Reef Fish Biodiversity and Complexity in the North Bay Reef of Andaman and Nicobar Islands, India
Bibliographic record
Abstract
Under water visual census using traditional belt transect method (30m x 5m) was conducted to survey the community structure of reef fish assemblages in the North Bay reef of A & N Islands over a period of 3 months on May, June and July of 2008. The Bay is a 1 km 2 fringing reef area lies between 11 0 42’12.1˝N latitude and 92 0 45’11.0˝E longitude in the vicinity of the East Coast of main city Port Blair. Five sampling areas were used for this study and the depth ranged from 2.2 m to 5.7 m. The total abundance (TA) was 4130 individuals, with 159 species from 31 families. The average TA of the different sampling stations from North to South in entire reef was 826 ± 118.00, diversity index (H’) 1.57, evenness index (J’) 0.3097 and species richness index (d) 18.98. H’ indicated less heterogeneity of species and individuals were unevenly distributed. J’ indicated variation on communities between the species. The coral fish diversity index (CFDI) for the reef was 69 and the appropriate regression formula (4.234 X 69-114.446) predicted an appropriate total of 178 species, indicating that at least 19 more species could be expected. Monthly mean of TA increased from 593.5 in May to 869 in June to 1039 in July, indicated progressive addition of new species with rainy season due to influx of nutrient rich run-off from surrounding hill areas. Pomacentridae dominated the entire reef with a TA of 1677 (40.61%) individuals followed by Phempheridae, 369 (8.94 %) individuals. Species richness of Pomacentridae was highest with 28 species followed by Serranidae with 17 species. Highest single species abundance in the Bay was 448 (10.85%) individuals by Chromis nigrura (Pomacentridae) followed by Phempheris vanicolensis (Phempheridae) with 369 (8.94%) individuals, indicated settlement of these species from nearby mangrove and sea bed areas where bigger sized predatory fishes seldom visit because of shallower depth and anthropogenic disturbances mainly tourist activities as the site is open-access to them. Spatial and temporal variations are less prominent in the reef.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".