Publications:

Ben-Zvi et al. 2015


scientific article | Hydrobiologia

Light-dependent fluorescence in the coral Galaxea fascicularis

Ben-Zvi O, Eyal G, Loya Y

Adobe pdf disabled
Www
Gscholar
Abstract

Light in the sea is one of the major factors influencing corals, with changes in light being rapid along the depth gradient. Those changes can be a potential stress factor for coral-reef organisms and affect different aspects of the coral’s physiology, including its fluorescence. Fluorescence is a physical phenomenon, comprising the emission of light by a substance that has absorbed light with a different wavelength. Major hypotheses concerning the role of coral fluorescence include that of photoprotection and the facilitation of photosynthesis. We sought to further investigate some ecophysiological aspects of coral fluorescence. We focused on the effect of different light conditions on fluorescence of the coral Galaxea fascicularis and used photography, confocal microscopy, and spectral measurements to assess changes in its fluorescence. We show that fluorescence is significantly influenced by light and, therefore, by depth. Coral fluorescence increased with the increase in light intensity and when the spectrum of light was broader. Hence, we support the “sunscreen” hypothesis and conclude that fluorescence plays a role in the coral’s defense mechanism against harmful radiation. However, multiple fluorescent proteins, as found in different locations of the coral tissue, might suggest more than one functional role of fluorescence in the coral’s physiology.

Behind the science
1 2 3
4 copy 5 6 copy
10.1007   s10750 014 2063 6
Keywords
Meta-data
Depth range
3- 50 m

Mesophotic “mentions”
4 x (total of 4394 words)

Fields
Ecology
Physiology
Long-term monitoring

Focusgroups
Scleractinia (Hard Corals)
Symbiodinium (zooxanthellae)

Locations
Israel - Red Sea

Platforms
Diving - Technical Open-Circuit
Land-based

Author profiles
Or Ben-Zvi ( 3 pubs)
Gal Eyal ( 6 pubs)
Yosi Loya ( 11 pubs)