Dissolved organic nitrogen: a dynamic participant in aquatic ecosystems

被引:470
作者
Berman, T
Bronk, DA
机构
[1] Israel Oceanog & Limnol Res, Yigal Alon Kinneret Limonol Lab, IL-14950 Migdal, Israel
[2] Virginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USA
关键词
dissolved organic nitrogen; phytoplankton; bacteria; N nutrition; N cycling; marine/freshwater ecosystems;
D O I
10.3354/ame031279
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
In both marine and freshwaters, the concentration of dissolved organic nitrogen (DON) frequently exceeds that of dissolved inorganic nitrogen (DIN), including ammonium, nitrate, and nitrite. Recent evidence indicates that many organic N compounds are released into the DON pool and taken up from this pool by planktonic microbiota on timescales of hours to days. This observation suggests that many components of the DON pool can play an active role in supplying N nutrition directly or indirectly to phytoplankton and bacteria and, in so doing, may affect the species composition of the ambient microbial assemblage. Here we present an overview of the state of knowledge of DON pools in aquatic environments, focused mainly on data gathered in the last decade. We review information on DON concentrations in freshwater and marine systems, analytical methods for the determination of DON, and the biotic and abiotic sources and sinks of DON. More detailed discussion addresses specific components of the DON pool: urea, dissolved combined and free amino acids, proteins, nucleic acids, amino sugars, and humic substances. The DON pool in natural waters is not inert and can be an important sink and source for N. There is a need for greater appreciation and understanding of the potential role of DON as a dynamic participant in the nitrogen cycle within aquatic ecosystems, particularly in freshwater environments.
引用
收藏
页码:279 / 305
页数:27
相关论文
共 380 条
[1]   Distributions of TOP, TON and TOC in the North Pacific subtropical gyre: Implications for nutrient supply in the surface ocean and remineralization in the upper thermocline [J].
Abell, J ;
Emerson, S ;
Renaud, P .
JOURNAL OF MARINE RESEARCH, 2000, 58 (02) :203-222
[2]  
Agustí S, 1998, LIMNOL OCEANOGR, V43, P1836
[3]  
Aiken G.R., 1985, Humic Subtances in Soil, Sediment, and Water: Geochemistry, Isolation, and Characterization, P363, DOI DOI 10.1002/GJ.3350210213
[4]  
Aiken G.R., 1988, HUMIC SUBSTANCES THE, P15
[5]   Importance of humic substances for carbon and nitrogen transport into southeastern United States estuaries [J].
Alberts, JJ ;
Takács, M .
ORGANIC GEOCHEMISTRY, 1999, 30 (06) :385-395
[6]   THE ABUNDANCE AND SIGNIFICANCE OF A CLASS OF LARGE, TRANSPARENT ORGANIC PARTICLES IN THE OCEAN [J].
ALLDREDGE, AL ;
PASSOW, U ;
LOGAN, BE .
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 1993, 40 (06) :1131-1140
[7]  
Alvarez AJ, 1996, ENVIRON TOXIC WATER, V11, P129, DOI 10.1002/(SICI)1098-2256(1996)11:2<129::AID-TOX8>3.0.CO
[8]  
2-B
[9]   RAPID-CYCLING OF HIGH-MOLECULAR-WEIGHT DISSOLVED ORGANIC-MATTER IN THE OCEAN [J].
AMON, RMW ;
BENNER, R .
NATURE, 1994, 369 (6481) :549-552
[10]   Linkages among the bioreactivity, chemical composition, and diagenetic state of marine dissolved organic matter [J].
Amon, RMW ;
Fitznar, HP ;
Benner, R .
LIMNOLOGY AND OCEANOGRAPHY, 2001, 46 (02) :287-297