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...

Agate World

The page is devoted only for beautiful agate and agate lover all over the world.

Collection of agate specimens
Agates collection 

Agate from China

Agate from Pujiang, China
Agate from Pujiang, China.

Agate from Pujiang, China
Agate from Pujiang, China.

Agate from Pujiang, China
Agate from Pujiang, China.

Agate from Pujiang, China
Agate from Pujiang, China

When almus agate is cut, many plumes and usually yellow and red bands appear.

Almus agate
Almus Agate
Turkish produces beautiful agates

Turkish agate
Turkish Agate

Turkish agate
Turkish Agate

Turkish agate
Turkish Agate
Black sea agate North Turkey
Black Sea agate
Black sea agate North Turkey


Black River Agate
This is a 3.25 inch stream rolled agate which was cut in half and polished. It is from Argentina and is called a Black River Agate. I acquired it back in 2008.
Black River agate
Black River Agate
Bobonong, Botswana
Agate from Bobonong, Botswana
Bobonong, Botswana




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