Identifying nitrogen sources to thermal tide pools in Kapoho, Hawai'i, USA, using a multi-stable isotope approach

被引:23
作者
Wiegner, Tracy N. [1 ]
Mokiao-Lee, Ambyr U. [2 ]
Johnson, Erik E. [2 ,3 ]
机构
[1] Univ Hawaii, Dept Marine Sci, 200 W Kawili St, Hilo, HI 96720 USA
[2] Univ Hawaii, Trop Conservat Biol & Environm Sci Grad Program, 200 W Kawili St, Hilo, HI 96720 USA
[3] Univ Hawaii, Hilo Analyt Lab, 200 W Kawili St, Hilo, HI 96720 USA
基金
美国国家科学基金会;
关键词
Coastal waters; Fertilizers; Macroalgae; Sewage; Stable isotopes; Water quality; GRACILARIA-TIKVAHIAE MCLACHLAN; CORAL-REEFS; SOURCE IDENTIFICATION; NITRATE SOURCES; ANTHROPOGENIC NITROGEN; DELTA-N-15; VALUES; BORON ISOTOPES; PHASE-SHIFTS; MACROALGAE; EUTROPHICATION;
D O I
10.1016/j.marpolbul.2015.12.046
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nitrogen (N) enrichment often results in coastal eutrophication, even in remote areas like Hawai'i. Therefore, determining N sources to coastal waters is important for their management This study identified N sources to tide pools in Kapoho, Hawai'i, and determined their relative importance using three stable isotopes (delta N-15,delta O-18, delta B-11). Surface waters and macroalgal tissues were collected along 100-m onshore-offshore transects in areas of high groundwater input for three months at low tide. Water samples from possible N sources were also collected. Mixing model output, along with macroalgal delta N-15 values, indicated that agriculture soil (34%) was the largest anthropogenic N source followed by sewage (27%). These findings suggest that more effective fertilizer application techniques and upgrading sewage treatment systems can minimize N leaching into groundwater. Overall, our multi-stable isotope approach for identifying N sources was successful and may be useful in other coastal waters. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:63 / 71
页数:9
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