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Model of a coral reef ecosystem

II. Gross and net benthic primary production at French Frigate Shoals, Hawaii

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Abstract

The ECOPATH model for French Frigate Shoals estimates the benthic plant production (net primary production in kg wet weight) required to support the atoll food chain. In this section we estimate the benthic net primary production and net community production of the atoll based on metabolism studies of reef flat, knolls, and lagoon communities at French Frigate Shoals Hawaii. Community metabolism was measured during winter and summer. The reef communities at French Frigate Shoals exhibited patterns and rates of organic carbon production and calcification similar to other reefs in the world. The estimate of net primary production is 6.1·106 kg wet weight km-2 year-1±50%, a value remarkably close to the estimate by the ECOPATH model of 4.3·106 kg wet weight km-2 year-1. Our estimate of net community production or the amount of carbon not consumed by the benthos was high; approximately 15% of the net primary production. Model results indicate that about 5% of net primary production is passed up the food chain to mobile predators. This suggests about 10% of net primary production (∼6% of gross primary production) may be permanently lost to the system via sediment burial or export offshore.

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Atkinson, M.J., Grigg, R.W. Model of a coral reef ecosystem. Coral Reefs 3, 13–22 (1984). https://doi.org/10.1007/BF00306136

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  • DOI: https://doi.org/10.1007/BF00306136

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