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Phototropic adjustment of the foliaceous coral Echinopora lamellosa in Palau  (summary by Jack)

3/19/2018

1 Comment

 
Citation:
Iwase, A., Sakai, K., Suzuki, A., & van Woesik, R. (2008) Phototropic adjustment of the foliaceous coral Echinopora lamellosa in Palau. Estuarine, coastal and shelf science, 77, 672–678. https://doi.org/10.1016/j.ecss.2007.10.022

Purpose:
Iwase et al. (2008) outline the concept of morphological adjustments by corals in response to wave action and light intensity. Many coral species have the ability to change their growth forms in response to light intensity while other coral species can only change their shape to a small extent. The coral species that express the latter for instance, may grow their branches toward the light or change the shape of their plates to maximize light intake. What previous studies didn’t focus on is the capacity of foliose corals (corals that can change shape to a small extent) in changing the shape of their plates to increase the number of tissue exposed to light.
 
Methods:
The researchers measure the angle of colonies of Echinopora lamellosa at various elevations of steep hills where light intensity is highest. They also produce a light model calculating both sun elevation and shade at any time and any location.
 
Results:
Foliose corals can change how much tissue on plates are exposed to light and E. lamellosa in particular can slightly change shape to look like it’s leaning with its plates taking on the shape of parabolic antennas. However, results show that sunlight intensity isn’t necessarily the only factor, suggesting that atmospheric diffusion or other factors may play an important role as well.
 
Significance for Palau:
Palau has a very rich diversity of coral communities because of its decent variety of reef habitats and lagoons. Reef flats around specific islands are quite notable for housing diverse coral communities even though the somewhat clear water limits visibility from the surface to between 10 and 12 meters. The diversity at these conditions shows the incredible adaptability of corals in limited sunlight. The paper by Iwase et al. may highlight the importance of morphological adjustments of corals in Palau and around the world when sea level increases with climate change and less sunlight reaches the corals underwater. Additionally, higher pollution levels in the air or from nutrient runoff may further diffuse sunlight intensity although corals may adapt very quickly and survive until conservation efforts are directed to coral reefs. 
1 Comment
Alex Ali
4/3/2018 07:45:38 am

This article is pretty interesting on how the authors look at the morphological adjustments corals make due to the amount of light it is given. It is a fact that plants grow and gather food from the process of photosynthesis; just like plants that are on land , corals tend to lean towards the light. The authors of this article go behind the thinking of this process and tries to figure out the specific adjustments that Echinopara lamellosa make.

Even though the amount of sunlight are a factor of morphological adjustments it isn't the only factor. "The waves,atmospheric diffusion, and the scattering of light at the sea surface and in the water column are other factors." If there was a positive relationship between the light and the corals the regression line would be close to 1. But its shows that the other factors are just as important.

The other factors must play a role for the corals in Palau because of the three aspects of the coral in Iwayama Bay:(1) it is sheltered from waves, (2) the waters are consistently turbid, and (3) light is limiting because of the steep landscape. This is something to notice when traveling to Palau.

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    Rebecca Rundell & Jesse Czekanski-Moir

    Co-instructors, 2018

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