Effects of Light Pollution on the Early Life Stages of the Most Abundant Northern Red Sea Coral
1
School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
2
The Interuniversity Institute for Marine Sciences in Eilat, Eilat 8810302, Israel
3
ARC Centre of Excellence for Coral Reef Studies, School of Biological Sciences, University of Queensland, St. Lucia, QLD 4072, Australia
4
The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat Gan 5290002, Israel
5
Department of Oceanography, The Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
*
Author to whom correspondence should be addressed.
Microorganisms 2020, 8(2), 193; https://doi.org/10.3390/microorganisms8020193
Received: 15 December 2019 / Revised: 28 January 2020 / Accepted: 29 January 2020 / Published: 31 January 2020
(This article belongs to the Special Issue The Human Epoch: Cnidarians Holobiont Responses from Physiology to Epigenetic)
The growth in human population along coastal areas is exposing marine environments to increasing anthropogenic light sources. Despite the potential effects of this modern phenomenon, very few studies have examined its implications for corals. Here, we present a long-term study of coral early life stages under light pollution conditions at night. Coral larvae were collected from Stylophora pistillata colonies, and then settled and grown under experimental conditions of two different common city lighting methods (fluorescent or LED). Effects of the artificial lighting on the coral settlement success, survivorship, growth rate, photosynthetic efficiency, and calcification rate were examined over a period of one year. The control exhibited ~30% higher settlement success compared to the two light treatments, while under the light treatments corals showed higher survivorship, growth, and calcification rates. In addition, an indication of damage to the photosynthetic system was found in the light-polluted corals, which was reflected in their photosynthesis efficiency parameters: i.e., lower maximum light utilization coefficient (α), lower maximum potential photosynthetic rate (Pmax), and lower photosynthetic maximal quantum yield (Fv/Fm). Our findings provide evidence of the potential adverse effects of artificial lighting methods on the natural environment of coral reefs. We conclude that the use of the LED lighting method has high interference potential for the early life stages of corals.
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Keywords:
anthropogenic disturbance; coral recruitment; coral reefs; ecosystem management; fluorescent lights; LED lights; light pollution; photosynthesis
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MDPI and ACS Style
Tamir, R.; Eyal, G.; Cohen, I.; Loya, Y. Effects of Light Pollution on the Early Life Stages of the Most Abundant Northern Red Sea Coral. Microorganisms 2020, 8, 193.
AMA Style
Tamir R, Eyal G, Cohen I, Loya Y. Effects of Light Pollution on the Early Life Stages of the Most Abundant Northern Red Sea Coral. Microorganisms. 2020; 8(2):193.
Chicago/Turabian StyleTamir, Raz; Eyal, Gal; Cohen, Itay; Loya, Yossi. 2020. "Effects of Light Pollution on the Early Life Stages of the Most Abundant Northern Red Sea Coral" Microorganisms 8, no. 2: 193.
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