QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

First published online October 10, 2003

This Article Summary Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Levy, O. Articles by Achituv, Y. Search for Related Content PubMed PubMed Citation Articles by Levy, O. Articles by Achituv, Y. Social Bookmarking                         What's this?

Photobehavior of stony corals: responses to light spectra and intensity

O. Levy^*, Z. Dubinsky and Y. Achituv

Faculty of Life Sciences, Bar-Ilan University, Ramat Gan 52900, Israel

View larger version (92K): [in a new window]   Fig. 1. Two stages of tentacle expansion, 0% (1,3,5,8) and 100% (2,4,6,7,9), in the five coral species. (1,2) Favia favus; (3,4) Goniopora lobata; (5,6) Plerogyra sinuosa; (7) Cladopsammia gracilis; (8,9) Stylophora pistillata.

View larger version (78K): [in a new window]   Fig. 2. A 3-dimensional structure of the daily illumination (µW m-2 nm-1) in the visible light spectrum (400-700 nm) measured at 5 m depth in Gulf of Eilat, Red Sea, in front of the Interuniversity Institute for Marine Science. Measurements were conducted on a cloudless day on February 14, 2001. The spectrum was scanned between 5:00 h and 18:30 h, with readings taken every 30 min at 2 nm intervals.

View larger version (31K): [in a new window]   Fig. 3. Action spectra of tentacle contraction in Favia favus and Plerogyra sinuosa (filled circles). Values are means ± S.D., N=5. (A) Comparison of the action spectrum of F. favus tentacle contraction to the light spectrum absorbed by the zooxanthellae at an irradiance level of 30 µmol quanta m-2 s-1 (open squares) (Pearson's correlation, r=-0.7557, P<0.0007). (B) Comparison of the action spectrum of F. favus tentacle contraction to the light spectrum absorbed by the zooxanthellae at an irradiance level of 10 µmol quanta m-2 s-1 (open squares) (Pearson's correlation, r=-0.8543, P<0.0001). (C) Comparison of the action spectrum (in vitro) of P. sinuosa tentacle contraction to the light spectrum absorbed by the zooxanthellae at an irradiance level of 30 µmol quanta m-2 s-1 (open squares) (Pearson's correlation r=-0.8667, P<0.0001, N=3).

View larger version (31K): [in a new window]   Fig. 4. Absorption characteristics of the major pigments extracted from F. favus zooxanthellae. Pigments are: Chl, chlorophyll; Chld, chlorophyllidae; Per, perdinin; Dia, diatoxanthin; Dino, diadinoxanthin.

View larger version (33K): [in a new window]   Fig. 5. Photosynthetic characteristics of corals with expanded and contracted tentacles (N=4 for each coral species). (A) The quantum yield of photochemistry in PSII (Fv/Fm). (B) The functional absorption cross section for PSII (PSII). a.u., arbitrary units.

View larger version (19K): [in a new window]   Fig. 6. Effect of the light spectrum (460-700 nm at intervals of 40 nm) at an irradiance level of 10 µmol quanta m-2 s-1 on the quantum yield of photochemistry in PSII (F'/Fm') related to dark measurements (Fv/Fm) in four coral species: Favia favus (filled circles; N=3); Stylophora pistillata (open circles; N=3); Plerogyra sinuosa (filled triangles; N=3); Goniopora lobata (open triangles; N=3).

CiteULike

Complore

Connotea

Del.icio.us

Digg

Reddit

Technorati

Twitter