Selective feeding by benthic foraminifera on phytodetritus on the western Antarctic Peninsula shelf: evidence from fatty acid biomarker analysis
Selective feeding by benthic foraminifera on phytodetritus on the western Antarctic Peninsula shelf: evidence from fatty acid biomarker analysis
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DOI：
10.3354/meps262153
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发表时间：
2003-11
影响因子：
2.5
通讯作者：
S. Suhr;D. Pond;A. Gooday;C. Smith
中科院分区：
文献类型：
--
作者：
S. Suhr;D. Pond;A. Gooday;C. Smith
这项研究提供了第一个直接证据，基于对新鲜材料的生化分析，某些底栖有孔虫选择性地以其自然环境中季节性沉积的植物碎屑的特定成分为食。2001年3月，在南极半岛以西的一个陆架上(水深560m)，在浮游植物水华物质沉积后采集到的3种底栖有孔虫：钙质物种Globocassidulina sublobosa和Ququieloculina Semula，以及凝集的白色念珠菌，其脂肪酸组成与周围的植物碎屑有显著差异。此外，这两个钙质物种的多不饱和脂肪酸(PUFAs)含量明显高于它们推测的植物碎屑食物来源中的多不饱和脂肪酸(PUFAs)，这表明有孔虫区分并选择性地以沉积物质的不同成分为食。文中还讨论了对底栖生物食物网的可能影响。
This study presents the first direct evidence, based on biochemical analysis of fresh material, that certain benthic foraminifera feed selectively on specific components of seasonally deposited phytodetritus in their natural environment. Three abundant species of benthic foramini- fera, the calcareous species Globocassidulina subglobosa and Quinqueloculina seminula and the agglutinated species Thurammina albicans, collected after the deposition of phytoplankton bloom material at a shelf site (560 m water depth) west of the Antarctic Peninsula in March 2001, showed significant differences in their fatty acid profiles compared to the surrounding phytodetritus. Fur- thermore, the 2 calcareous species contained significantly higher amounts of polyunsaturated fatty acids (PUFAs) than were found in their presumptive phytodetrital food source, indicating that the foraminifera discriminate between, and selectively feed on, the different components of the deposited material. Possible implications for the benthic food web are discussed.