ArticleScientific reports2026
Carbonate framework and sediment production across island-fringing coral reef habitats and a natural nutrient gradient.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Coral reef framework production and sediment generation are key controls on vertical reef accretion and reef island maintenance. However, quantitative data on these geo-ecological functions remain scarce, particularly within shallow habitats that mediate incoming wave energy and sediment supply to shorelines. This study quantified carbonate framework and sediment budgets across shallow lagoon reef (1-2 m), shallow forereef (2-3 m) and deep forereef habitats (8-9 m) surrounding six islands within three atolls (2 islands/atoll) in the remote Chagos Archipelago, Central Indian Ocean. One of the islands in each atoll supports dense seabird colonies that deliver natural nutrient subsidies to nearshore habitats via guano run-off, enabling assessment of nutrient impacts on reef carbonate dynamics. Benthic surveys (ReefBudget and SedBudget) were combined with sediment composition analyses from shallow reefs and adjacent beaches. Variation in coral cover and composition among atolls, linked to differences in atoll size and post-2016 bleaching recovery, resulted in higher framework production at Salomon Atoll. After accounting for atoll-level variability, framework production exhibited habitat-specific patterns, with highest mean rates at lagoon reefs (5.5 kg m
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