scholarly journals Nitrogen isotopes of organic nitrogen in reef coral skeletons as a proxy of tropical nutrient dynamics

2011 ◽  
Vol 38 (19) ◽  
pp. n/a-n/a ◽  
Author(s):  
Atsuko Yamazaki ◽  
Tsuyoshi Watanabe ◽  
Urumu Tsunogai
Keyword(s):  
Organic Nitrogen ◽  
Nutrient Dynamics ◽  
Nitrogen Isotopes ◽  
Reef Coral ◽  
Coral Skeletons

Seasonal high and low density bands in reef coral skeletons

Nature ◽  
1975 ◽  
Vol 255 (5511) ◽  
pp. 697-698 ◽  
Author(s):  
JON N. WEBER ◽  
PETER DEINES ◽  
EUGENE W. WHITE ◽  
PATRICIA H. WEBER
Keyword(s):  
Reef Coral ◽  
Low Density ◽  
Coral Skeletons

Separation of kinetic and metabolic isotope effects in carbon-13 records preserved in reef coral skeletons

2000 ◽  
Vol 64 (6) ◽  
pp. 975-987 ◽  
Author(s):  
Jeffrey M. Heikoop ◽  
Jennifer J. Dunn ◽  
Michael J. Risk ◽  
Henry P. Schwarcz ◽  
Ted A. McConnaughey ◽  
...  
Keyword(s):  
Isotope Effects ◽  
Reef Coral ◽  
Coral Skeletons

scholarly journals Photosymbiosis and the expansion of shallow-water corals

2016 ◽  
Vol 2 (11) ◽  
pp. e1601122 ◽  
Author(s):  
Katarzyna Frankowiak ◽  
Xingchen T. Wang ◽  
Daniel M. Sigman ◽  
Anne M. Gothmann ◽  
Marcelo V. Kitahara ◽  
...  
Keyword(s):  
Shallow Water ◽  
Nitrogen Isotopes ◽  
Late Triassic ◽  
Shallow Marine ◽  
Tethys Sea ◽  
Coral Skeletons ◽  
Main Driver ◽  
Ecological Success ◽  
Key Driver ◽  
Modern Reef

Roughly 240 million years ago (Ma), scleractinian corals rapidly expanded and diversified across shallow marine environments. The main driver behind this evolution is uncertain, but the ecological success of modern reef-building corals is attributed to their nutritional symbiosis with photosynthesizing dinoflagellate algae. We show that a suite of exceptionally preserved Late Triassic (ca. 212 Ma) coral skeletons from Antalya (Turkey) have microstructures, carbonate13C/12C and18O/16O, and intracrystalline skeletal organic matter15N/14N all indicating symbiosis. This includes species with growth forms conventionally considered asymbiotic. The nitrogen isotopes further suggest that their Tethys Sea habitat was a nutrient-poor, low-productivity marine environment in which photosymbiosis would be highly advantageous. Thus, coral-dinoflagellate symbiosis was likely a key driver in the evolution and expansion of shallow-water scleractinians.

The Assessment of Content and Dynamics of Nutrients in Water and Sediments from the Plumbuita Lake, Bucharest. II. Study on nitrogen content and distribution

2018 ◽  
Vol 68 (12) ◽  
pp. 2744-2646
Author(s):  
Ecaterina Marcu ◽  
Gyorgy Deak ◽  
Irina Elena Ciobotaru ◽  
Alexandru Anton Ivanov ◽  
Petra Ionescu ◽  
...  
Keyword(s):  
Water Pollution ◽  
Organic Nitrogen ◽  
Nutrient Dynamics ◽  
National Level ◽  
Nutrient Content ◽  
Integrated Approach ◽  
Nitrogen Distribution ◽  
Special Concern ◽  
Nitrite Nitrate ◽  
Water Eutrophication

Water pollution with nutrient-based contaminants represents a special concern at national level as it may lead to the occurrence of water eutrophication affecting the properties of the water bodies. This paper presents the characterisation of nitrogen distribution in water and sediments from the Plumbuita Lake (Bucharest, Romania) and the speciation of this element in the form of ammonium, nitrite, nitrate and organic nitrogen. The results of this study prove the importance of an integrated approach regarding the quantification of nutrient content with the nutrient dynamics in the evaluation of the eutrophication phenomenon.

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