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• W655971404 abstract "Spatial distribution of nitrogen species across the Similan Islands chain from west to east directionswere investigated during a low and high large amplitude internal waves (LAIW) season in December2010 and March 2011. Periodic water sampling was performed on the west side Similan reef in adepth of about 15-17 meter together with an in situ temperature logged CTD. Temporal samplingswere carried out to determine the dominant nitrogen species in the soliton water reaching the Similanisland chain. The major inorganic nitrogen species were chosen in order to determine dissolvedinorganic nitrogen (DIN) uptake in screlactenian corals. Pocillopora verrucosa (Ellis &Solander, 1786) was assigned as experimental species because of its common presence on both, westand east sides of the Similan Islands and Racha Island. 40 coral nubbins were collected in situ andreared in the PMBC aquarium for the experimental approaches. The corals were incubated in a RedSea Salt® solution to control the organic and inorganic nutrient background. Normal warm reeftemperature (28°C) and cold LAIW temperature (20°C) were applied in the incubations with differentDIN concentrations (control N, 20 μM NO3-, 6 μM NH4+20 and 20 μM NO3- & 6 μM NH4+) underboth dark and light conditions. The incubation period was 2 hours but the water samples were taken astime series after 0, 10, 30, 60, 90 and 120 minutes respectively. The DIN uptake rates were calculatedper coral surface area and time period. Additionally, in order to get information on the micro scale ofinorganic nitrogen uptake, labeled 15NO3- and 15NH4+ were used in a further incubation run. Nitratewas found to be the dominant DIN in the soliton waters approaching the reefs at the Similan Islands.The NO3- uptake experiments under low temperature conditions revealed a significant negative effecton the nitrate uptake rate in both light and dark. However, the concentration-dependent uptakebehavior was found in both NH4+ and NO3- enriched experiments. The concentration of DIN present inwater had a higher effect on the uptake rates than temperature. High NH4+ concentration was shownto limit NO3– uptake. NH4+ was more favorable to P.verrucosa than NO3-. Light independent uptakeswere discovered in both NH4+ and NO3- enriched experiments. The highest uptake rates were found atthe beginning of the incubation experiments (10 minutes after the start) in both NH4+ and NO3-enriched experiments. The labeled DIN experiments showed that the symbiotic algae are the terminalstation for both NO3- and NH4+. Delta 15N enrichment exhibits similar results in temperaturedependence and concentration dependence as found in normal DIN uptake experiments. Interestingly,a higher uptake rate of NH4+ was found in the zooxanthellae under enriched NH4+ & NO3- combinedwith low temperature conditions. LAIW seem to be favorable for the symbiotic corals in the Similanswith a high inorganic nutrient supply. Even though the low temperature entrained by the LAIW to thereefs suppresses the optimum uptake the higher abundance of DIN has a greater effect on the corals.This denotes differences in the uptake behavior of corals growing on the exposed side of the SimilanIslands (west) and the sheltered sides (east). With this study a possible explanation might bevisualized to the differences of the framework formations found on the LAIW exposed and shelteredreefs." @default.
• W655971404 created "2016-06-24" @default.
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• W655971404 date "2011-09-01" @default.
• W655971404 modified "2023-09-27" @default.
• W655971404 title "Input of various nitrogen species by large amplitude internal waves (LAIW) and intake by Pocillopora verrucosa" @default.
• W655971404 hasPublicationYear "2011" @default.
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