Environmental indication of macroalgal δ15N values at intertidal zone
WANG Yu-jue1, DI Bao-ping1, LI Xin1,2, LIU Dong-yan1
1. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：The total carbon(TC), total nitrogen(TN) and nitrogen stable isotope ratio(δ15N) in macroalgal tissue were analyzed in conjunction with environmental variables in seawater to study the nitrogen sources and select effective macroalgal species along the Yantai coast. The results showed that macroalgal δ15N values at the three sites were all between 6.18‰ and 10.99‰, indicating sewage effluent and/or aquaculture discharge being the dominant nitrogen sources. Sewage effluent was dominant factors affecting the nitrogen concentrations in the Moon Bay(S1). The nitrogen concentration at the Yangma Island(S3) was mainly related to aquaculture discharge and the Fisherman Wharf(S2) was affected by both sewage and aquaculture discharge. Ulva pertusa and Enteromorpha intestinalis in Chlorophyta are identified as effective indicators due to their high nitrogen uptake and minimal nitrogen fractionation.
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