Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 542, Issue -, Pages 306-314Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.10.059
Keywords
DIN sources; Macroalgae; delta N-15; Indicator; Yantai coast
Categories
Funding
- Natural Science Foundation of China [41106101, 41376121]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA11020405]
- Natural Science Foundation of Shandong Province [JQ201414]
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To determine the dominant nitrogen sources and select effective macroalgal species for monitoring eutrophication along the Yantai coast, the total carbon (TOC), total nitrogen (TN) and nitrogen stable isotope ratio (delta N-15) in macroalgal tissue were analyzed in conjunction with environmental variables in sea water along the Yantai coastline. The ranges of macroalgal tissue delta N-15 values together with dissolved inorganic nitrogen (DIN) composition indicated that except for the atmospheric deposition, there were three dominant types of nitrogen sources along the Yantai coast, with the agricultural fertilizer usage and factorial wastewater input at the S1 (Zhifu Island coast), the sewage discharge at S2 (the Moon Bay coast), the sewage discharge together with aquaculture impacts at S3 (Fisherman Wharf coast) and S4 (the Horse Island coast). Macroalgal growth were not limited by DIN but limited by P at S2, S3 and S4. Macroalgal species suitable or not for DIN source tracing along the Yantai coast were discussed. For sites with low DIN concentration, many species of three phyla could be used for DIN sources tracing with Laurencia okamurai, Gloiopeltis furcata and Ulva pertusa being ideal species. For site with high DIN concentration, however, species of Rhodophyta were not suitable and only Scytosiphon lomentaria and Monostroma nitidium were chosen. (C) 2015 Elsevier B. V. All rights reserved.
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