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How Corals Feed: Symbiosis, Nutrition and Survival Under Stress

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A coral skeleton records growth, but living tissue supplies the energy that makes growth possible. Corals are animals, yet many reef corals obtain energy through a partnership with photosynthetic microorganisms. They can also feed on external resources. Understanding these energy pathways helps explain why changes in light, food and water conditions can affect coral growth and survival. [1] Two important energy pathways In photosymbiotic corals, algal partners capture light energy and share products of photosynthesis with the host. The animal also obtains food through heterotrophy, including the capture or uptake of organic resources. Their relative contributions differ among species and environments. [1] Symbiosis illustration, Figure 1 from the bleaching overview; used here to explain the nutritional partnership. Image: Norma Olguín-López and colleagues (2017) , IntechOpen source , CC BY 3.0 . Reproduced without scientific alteration. What does trophic plasticity mean? Trophic plasti...
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Coral Farming and Reef Restoration: How Nurseries Support Recovery

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Planting coral begins a restoration project; sustained care determines what follows. Coral farming for reef rehabilitation is the managed propagation of living coral to support damaged populations and habitats. It is an ecological activity, with different objectives from producing ornamental material for jewellery. Research from Puerto Rico offers useful lessons about nursery design, maintenance, monitoring and community involvement. [1,2] What is a coral nursery? A nursery provides a managed setting in which selected corals can grow before transfer to restoration sites. Low-tech systems include frames, lines and suspended structures. The appropriate method depends on the coral species and local conditions. A successful structure in one location is not a universal recipe. [1] Examples of low-tech nursery methods, Figure 2 in the source chapter. Image: Edwin A. Hernández-Delgado, Alex E. Mercado-Molina and Samuel E. Suleimán-Ramos (2018) , IntechOpen source , CC BY 3.0 . Reproduced with...
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Coral Bleaching Explained: Causes, Recovery and Gem Coral Differences

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A white coral colony tells a story about living tissue, energy and environmental stress. Coral bleaching is often shown as a dramatic change from a colourful reef to a pale landscape. For gemology students, the word bleaching can be confusing: a stressed living coral and a chemically treated coral bead describe different processes. This guide introduces the biology before connecting it to gemstone terminology. What happens during coral bleaching? Many shallow-water reef corals live with microscopic photosynthetic partners in their tissues. These partners provide an important source of energy. When their relationship breaks down, the coral may lose symbiotic cells or their pigments. The pale skeleton becomes more visible through the remaining tissue. Bleaching describes this change; it does not automatically mean the animal is already dead. [1] Host–algal symbiosis, Figure 1 in the source chapter. Image: Norma Olguín-López and colleagues (2017) , IntechOpen source , CC BY 3.0 . Reproduc...
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Precious Coral: Types, Identification and Natural vs Dyed Colour

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A polished surface shows beauty; careful examination reveals the material. Precious coral is a biogenic gem material used in beads, cabochons and carvings. Its attractive appearance can hide three different questions: Is it coral? Has it been treated? Can its species or geographic origin be established? This guide explains why these questions need separate answers. Figure 1. A specimen identified as Corallium japonicum in the source research. Image: Luwei Fan (2018) , Figure 5, Precious Coral , CC BY 3.0 . Reproduced without scientific alteration. What is precious coral? Coral is produced by animals. Precious coral skeletons contain predominantly calcium carbonate, commonly magnesium-bearing calcite, together with a small organic component. The organic material contributes to both skeletal organisation and pigmentation. Polishing exposes the compact skeleton used in jewellery. [1] Key distinction: Natural coral can have an artificial colour. Confirming the material as coral does not...
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Gemstone Treatments: Types, Detection Methods and Examples

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Gemstone treatments and how gemologists detect them Gemstone treatments change colour, clarity or other properties beyond ordinary cutting and polishing. This illustrated guide explains coating, dyeing, oiling, fracture filling, laser drilling, heating, diffusion and irradiation. The photographs show examples used in practical gemological examination. Identification note: A photograph or a single visual clue rarely establishes treatment status. Some treatments require spectroscopy or chemical analysis, and some cannot be detected conclusively with routine tests. Illustrated treatment types and detection features Finding treatments that may have been made to enhance the color or appearance of the gemstones under examination is one of the gemologist's main duties. We must first understand what a treated gem is in order to understand enhancement or treatment. Thus, the treated gem may be  described as follows     Treated Gem:  Any Gem material (Natural) which has bee...
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