Wakeham S G, Freeman K H, Pease T K, Hayes J M
Skidaway Institute of Oceanography, Savannah, GA 31416.
Geochim Cosmochim Acta. 1993 Jan;57(1):159-65. doi: 10.1016/0016-7037(93)90476-d.
Suspended particulate matter and recent sediments from diverse oceanic sites have been investigated for their contents of lycopane. Lycopane was present in all samples, including both oxic and anoxic water column and sediments. The highest concentrations in the water column were found in surface waters of the central Pacific gyre (1.5 ng/L) and in the anoxic waters of the Cariaco Trench (1.1 ng/L) and the Black Sea (0.3 ng/L). Vertical concentration profiles suggest that lycopane is probably algal in origin. Moreover, biogeochemical conditions in anoxic zones apparently result in a secondary production of lycopane from an as yet unidentified precursor. Compound-specific carbon isotopic analyses have been carried out on lycopane from water column and sediment samples. Isotopic compositions of lycopane range between -23.6% and -32.9% and are consistent with a photoautotrophic origin. We postulate that some lycopane is produced in surface waters of the ocean, while additional lycopane is produced in anoxic zones by anaerobic microbial action on an algal precursor.
对来自不同海洋地点的悬浮颗粒物和近期沉积物中的番茄烃含量进行了调查。所有样品中均存在番茄烃，包括有氧和无氧水柱及沉积物。水柱中最高浓度出现在中太平洋环流的表层水（1.5纳克/升）、卡里亚科海沟的无氧水（1.1纳克/升）和黑海（0.3纳克/升）。垂直浓度剖面表明番茄烃可能起源于藻类。此外，缺氧区的生物地球化学条件显然导致了番茄烃由一种尚未确定的前体物质二次生成。已对水柱和沉积物样品中的番茄烃进行了化合物特异性碳同位素分析。番茄烃的同位素组成在-23.6%至-32.9%之间，与光合自养起源一致。我们推测，一些番茄烃是在海洋表层水中产生的，而另外一些番茄烃是在缺氧区由厌氧微生物对藻类前体物质作用产生的。
