Pour illustrer mon propos, un vieux papier qui montre que le bleu et le blanc favorisent la croissance des coraux, contrairement au vert et au rouge:
Kinzie, R. A., Jokiel, P. L., & York, R. (1984). Effects of light of altered spectral composition on coral zooxanthellae associations and on zooxanthellae in vitro.
Marine Biology,
78(3), 239-248.
Le lien:
https://link.springer.com/content/pdf/10.1007/BF00393009.pdfL'abstract (je souligne):
AbstractPocillopora damicornis (Linnaeus) and
Montipora verrucosa (Lamarck) were collected from Hawaiian reefs. In two experiments (September 1979-January 1980: ca. 4 mo; August-October 1980; ca. 2 mo), these reef corals were grown under sunlight passed through filters producing light fields of similar quantum flux but different spectral composition. In vitro cultures of symbiotic zooxanthellae (
Symbiodinium microadriaticum Freudenthal) from
M. verrucosa were cultured under similar conditions for 15d.
Blue or white light promoted more coral skeletal growth than green or red light.
In both coral species, blue light increased the total amount of chlorophylla of the coral-zooxanthellae association. In the perforate species,
M. verrueosa, the pigment concentration was elevated by an increase in the density of zooxanthellae, but the pigment concentrations per algal cell remained unchanged; in the non-perforate species,
P. damicornis, it appears that pigment concentration was elevated by an increase in pigment per algal cell, and not by an increase in density of zooxanthellae. The "sun-loving" reef-fiat coral
P. damicornis did not grow as rapidly as the "shade-species"
M. verrucosa at the low quantum flux (about 10% sunlight) provided by the experimental treatments.
The in vitro cultures of zooxanthellae from M. verrueosa exhibited growth rates in light of altered spectral quality that correlated with the responses of the host coral species: blue and white light supported significantly greater growth than green light, and red light resulted in the lowest growth rate.
