Effect of terrigenous sedimentation on mangrove physiology and associated macrobenthic communities
Bibliographic record
Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook (Twitter) RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 270:71-82 (2004) - doi:10.3354/meps270071 Effects of terrigenous sedimentation on mangrove physiology and associated macrobenthic communities J. Ellis1,2,*, P. Nicholls1, R. Craggs1, D. Hofstra1, J. Hewitt1 1National Institute of Water and Atmospheric Research, PO Box 11-115, Hamilton, New Zealand 2Present address: 18 Cabot Street, St John¹s, Newfoundland A1C 1Z4, Canada *Email: amahon@actrix.co.nz ABSTRACT: In New Zealand, one species of mangrove, Avicennia marina var. australasica, forms a characteristic and often an extensive feature of the tidal mudflats of harbours and estuaries. Within their natural range, mangroves have generally increased in abundance in New Zealand over the last 100 yr in response to increased sedimentation associated with concurrent changes in catchment land use. However, little information is available about the ecological consequences of changes in the extent of mangrove habitats under varying sedimentation regimes. We therefore conducted a study to determine the effects of high sedimentation rates on mangrove plant communities and associated benthic community composition. We selected an estuary that is experiencing high rates of sedimentation (as high as 23 mm yr-1) and associated increases in mangrove area. We recorded clear differences in both plant and benthic communities along a gradient of decreasing sedimentation. Mangrove architecture (such as height and density of plants) and health (as measured by chlorophyll a fluorescence) were linked to high mud content of the sediment and elevated sedimentation patterns. Mangrove plants at the upper landward sites, characterised by a high percentage of mud and high total nutrients (total phosphorus [TP] and total nitrogen [TN]) and organic content, were taller than those at the seaward sites and had a larger number of pneumatophores as well as the greatest number of new seedlings. However, benthic macrofaunal diversity and abundance within the mangrove habitats were lower than expected, and clear functional differences were found between habitats with differing sedimentation patterns. Sites with high sedimentation rates had lower numbers of suspension feeders, low macrobenthic diversity, and were dominated by deposit-feeding polychaetes and oligochaetes. The diversity and density of benthic macrofaunal communities was, however, lower than that of sandflat communities for both mangrove habitats and adjacent intertidal mudflats in these sheltered areas, suggesting a response to the increased silt/clay from sedimentation rather than to the mangroves themselves. Our study demonstrates the potential for functional and structural effects on benthic communities on a larger spatial scale in estuarine areas experiencing high rates of sedimentation. KEY WORDS: Mangrove · Benthic community composition · Sedimentation · Growth · Physiological condition · Estuary · New Zealand Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 270. Online publication date: April 14, 2004 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2004 Inter-Research.
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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 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".