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Coral Reefs at the Crossroads by Dennis K. Hubbard, Caroline S. Rogers, Jere H. Lipps, George

By Dennis K. Hubbard, Caroline S. Rogers, Jere H. Lipps, George D. Stanley Jr.

In this e-book, participants from varied backgrounds take a primary step towards an built-in view of reefs and the importance in their contemporary decline. greater than the other earth process, coral reefs sit down at a disciplinary crossroads. so much lately, they've got reached one other crossroads - basic adjustments of their bio-physical constitution more than these of earlier centuries or perhaps millennia. powerful ideas to mitigate contemporary tendencies would require an technique that embraces the myriad views from around the medical panorama, yet also will want a mechanism to rework medical figuring out into social will and political implementation.

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2 Variation in coral morphology (a) branch tip of Acropora palmata, (b) colony of branching Acropora humilis (c) plate-like colony of Montipora capitata (d) encrusting Porites rus (e) foliose Turbinaria sp. (f) solitary coral Fungia scutaria (g) cross-section skeleton of a massive Porites sp. (h) branched, non-scleractinian hydrocoral Millepora tenera. Note that all growth forms lack zooxanthellae on the rapidly growing distal branch tips, distal plate margins, and distal edges of septae and trabeculae as shown in Fig.

As light penetrates a Fig. L. Jokiel et al. Fig. 6 (continued) skeletal septum in the distal portion of a corallite it scatters and will diffuse into neighboring septa and redistribute throughout the colony. This enables millimeter-size structures to increase amplification as much as twentyfold by trapping light within coral tissue due to multiple passes. This mechanism of redistribution enhances delivery of light to zooxanthellae and also delivers light to shaded parts of the coral colony. 2 Application of Model to Other Coral Morphologies The generalized Proton Flux Model applies over a wide range of coral morphologies (Figs.

Al-Horani et al. (2003b) found that gross photosynthesis was approximately seven times higher than net photosynthesis, indicating that respiration consumes most of the O2 produced by the zooxanthellae. The respiration rate in light was approximately 12 times higher than in the dark. The coupling of gross photosynthesis and light respiration produces intense cycling of internal carbon and O2. Thus hyperoxia is a key feature of reef coral metabolism that is managed very well by the coral under normal conditions through a variety of mechanisms.

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