scholarly journals Effects of Light Pollution on the Early Life Stages of the Most Abundant Northern Red Sea Coral

2020 ◽  
Vol 8 (2) ◽  
pp. 193 ◽  
Author(s):  
Raz Tamir ◽  
Gal Eyal ◽  
Itay Cohen ◽  
Yossi Loya
Keyword(s):  
Early Life ◽  
Light Pollution ◽  
Life Stages ◽  
Early Life Stages ◽  
Experimental Conditions ◽  
Stylophora Pistillata ◽  
Artificial Lighting ◽  
Long Term Study ◽  
Settlement Success ◽  
Lower Maximum

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.

scholarly journals Effect of ocean acidification on the early life stages of the blue mussel <i>Mytilus edulis</i>

2010 ◽  
Vol 7 (7) ◽  
pp. 2051-2060 ◽  
Author(s):  
F. Gazeau ◽  
J.-P. Gattuso ◽  
C. Dawber ◽  
A. E. Pronker ◽  
F. Peene ◽  
...  
Keyword(s):  
Mytilus Edulis ◽  
Early Life ◽  
Blue Mussel ◽  
Shell Growth ◽  
Life Stages ◽  
Early Life Stages ◽  
Environmental Disturbances ◽  
Future Studies ◽  
Settlement Success ◽  
Hatching Rates

Abstract. Several experiments have shown a decrease of growth and calcification of organisms at decreased pH levels. There is a growing interest to focus on early life stages that are believed to be more sensitive to environmental disturbances such as hypercapnia. Here, we present experimental data, acquired in a commercial hatchery, demonstrating that the growth of planktonic mussel (Mytilus edulis) larvae is significantly affected by a decrease of pH to a level expected for the end of the century. Even though there was no significant effect of a 0.25–0.34 pH unit decrease on hatching and mortality rates during the first 2 days of development nor during the following 13-day period prior to settlement, final shells were respectively 4.5±1.3 and 6.0±2.3% smaller at pHNBS~7.8 (pCO2~1100–1200 μatm) than at a control pHNBS of ~8.1 (pCO2~460–640 μatm). Moreover, a decrease of 12.0±5.4% of shell thickness was observed after 15d of development. More severe impacts were found with a decrease of ~0.5 pHNBS unit during the first 2 days of development which could be attributed to a decrease of calcification due to a slight undersaturation of seawater with respect to aragonite. Indeed, important effects on both hatching and D-veliger shell growth were found. Hatching rates were 24±4% lower while D-veliger shells were 12.7±0.9% smaller at pHNBS~7.6 (pCO2~1900 μatm) than at a control pHNBS of ~8.1 (pCO2~540 μatm). Although these results show that blue mussel larvae are still able to develop a shell in seawater undersaturated with respect to aragonite, the observed decreases of hatching rates and shell growth could lead to a significant decrease of the settlement success. As the environmental conditions considered in this study do not necessarily reflect the natural conditions experienced by this species at the time of spawning, future studies will need to consider the whole larval cycle (from fertilization to settlement) under environmentally relevant conditions in order to investigate the potential ecological and economical losses of a decrease of this species fitness in the field.

Feeding selectivity in early life stages of Rhamdia voulezi under experimental conditions

2016 ◽  
Vol 48 (4) ◽  
pp. 1618-1628 ◽  
Author(s):  
Ariane Furtado de Lima ◽  
Maristela Cavicchioli Makrakis ◽  
Fernanda Freitas Andrade ◽  
Elaine Antoniassi Luiz Kashiwaqui ◽  
Michele de Faveri Gimenes ◽  
...  
Keyword(s):  
Early Life ◽  
Life Stages ◽  
Feeding Selectivity ◽  
Early Life Stages ◽  
Experimental Conditions

scholarly journals The pantophysin gene and its relationship with survival in early life stages of Atlantic cod

2020 ◽  
Vol 7 (10) ◽  
pp. 191983
Author(s):  
Håkon Otterå ◽  
Torild Johansen ◽  
Arild Folkvord ◽  
Geir Dahle ◽  
Marte Kristine Solvang Bingh ◽  
...  
Keyword(s):  
Early Life ◽  
Atlantic Cod ◽  
Experimental Studies ◽  
Gene Marker ◽  
Life Stages ◽  
Stock Management ◽  
Early Life Stages ◽  
Experimental Conditions ◽  
Temperature Regimes

Genetic markers are widely used in fisheries management around the world. While the genetic structure and markers selected are usually based on samples from the wild, very few controlled experiments have been carried out to investigate possible differences in influence on traits between markers. Here we examine the bi-allelic gene pantophysin (Pan I), widely used in the management of Atlantic cod, in a series of in vitro crosses under a range of temperatures. It has been proposed that this gene, or another tightly linked gene, may be under strong divergent selection. Resolving this issue is essential in order to interpret results when using this gene marker for stock management. We found no evidence of departure from the expected 1 : 2 : 1 Mendelian ratio for any of the three genotypes during the egg stage, while both the 6 and 12°C temperature regimes in tank experiments favoured the survival of the Pan I AA genotype. No difference in genotype survival was, however, found in a more natural mesocosm environment. Collectively, these results suggest that for the early life stages of Atlantic cod, and under the current experimental conditions, there is no strong consistent influence of Pan I genotype on survival. The results also emphasize the importance of varied experimental studies to verify the importance of environmental factors influencing genotype selection.

Toxicity testing of crude oil and fuel oil using early life stages of the black porgy (Acanthopagrus schlegelii)

2012 ◽  
Vol 112 (1) ◽  
pp. 1-7
Author(s):  
Anglv Shen ◽  
Fenghua Tang ◽  
Wantu Xu ◽  
Xinqiang Shen
Keyword(s):  
Crude Oil ◽  
Early Life ◽  
Toxicity Testing ◽  
Fuel Oil ◽  
Life Stages ◽  
Early Life Stages ◽  
Acanthopagrus Schlegelii ◽  
Black Porgy

Abundance of Pelagia noctiluca early life stages in the western Mediterranean Sea scales with surface chlorophyll

2020 ◽  
Author(s):  
D Ottmann ◽  
D Álvarez-Berastegui ◽  
L Prieto ◽  
R Balbín ◽  
F Alemany ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Early Life ◽  
Western Mediterranean ◽  
Life Stages ◽  
Early Life Stages ◽  
Western Mediterranean Sea ◽  
Pelagia Noctiluca

Natural and anthropogenic effects on the early life stages of European anchovy in one of its essential fish habitats, the Guadalquivir estuary

2019 ◽  
Vol 617-618 ◽  
pp. 67-79 ◽  
Author(s):  
GF de Carvalho-Souza ◽  
E González-Ortegón ◽  
F Baldó ◽  
C Vilas ◽  
P Drake ◽  
...  
Keyword(s):  
Early Life ◽  
Anthropogenic Effects ◽  
Life Stages ◽  
Early Life Stages ◽  
European Anchovy ◽  
Guadalquivir Estuary ◽  
Fish Habitats

Incubation Temperature Influences the Duration of Egg Hatching and Early Development in the Boreal Digging Frog, Kaloula Borealis

2020 ◽  
Vol 3 (1) ◽  
pp. ACCEPTED
Author(s):  
Rho-Jeong Rae
Keyword(s):  
Water Temperature ◽  
Early Life ◽  
Rainy Season ◽  
Incubation Temperature ◽  
Life Stages ◽  
Early Life Stages ◽  
Egg Hatching ◽  
Significant Difference ◽  
The Mean ◽  
Hatching Rates

This study investigated the boreal digging frog, Kaloula borealis, to determine the egg hatching period and whether the hatching period is affected by incubation temperature. The results of this study showed that all the eggs hatched within 48 h after spawning, with 28.1% (±10.8, n=52) hatching within 24 h and 99.9% (±0.23, n=49) within 48 h after spawning. A significant difference was noted in the mean hatching proportion of tadpoles at different water temperatures. The mean hatching rates between 15 and 24 h after spawning was higher at a water temperature of 21.1 (±0.2) °C than at 24.1 (±0.2) °C. These results suggest that incubation temperature affected the early life stages of the boreal digging frog, since they spawn in ponds or puddles that form during the rainy season.

First Records and Descriptions of Early Life Stages of Cephalopods from Rapa Nui (Easter Island) and the Nearby Apolo Seamount

2019 ◽  
Vol 73 (1) ◽  
pp. 163 ◽  
Author(s):  
Sergio A. Carrasco ◽  
Erika Meerhoff ◽  
Beatriz Yannicelly ◽  
Christian M. Ibáñez
Keyword(s):  
Early Life ◽  
Easter Island ◽  
Life Stages ◽  
Early Life Stages ◽  
Rapa Nui
Sign in / Sign up

Export Citation Format

Share Document