Abundance of thraustochytrids and bacteria in the equatorial Indian Ocean, in relation to transparent exopolymeric particles (TEPs)
Abundance of thraustochytrids and bacteria in the equatorial Indian Ocean, in relation to transparent exopolymeric particles (TEPs)
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DOI：
10.1111/j.1574-6941.2008.00500.x
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发表时间：
2008-07-01
影响因子：
4.2
通讯作者：
Raghukumar, Seshagiri
中科院分区：
文献类型：
--
作者：
Damare, Varada;Raghukumar, Seshagiri
Thraustochtrid原生生物经常在沿海水域大量存在。然而，它们在海洋水柱中的种群动态和底物偏好却知之甚少。在2003年9月、2004年10月和2006年9月，我们研究了赤道印度洋水域中鞭毛虫、细菌和TEP的丰度和分布。鞭毛虫和细菌丰富，表明该地区的生物生产力很高。在2004年10月期间，鞭毛虫与细菌呈正相关，但在其他时间则不相关，这表明在不同的时间，重叠或不同的底物偏好。在2004年10月期间，只有少数站点的TEP与沙门氏菌和细菌呈正相关，但在滚转台实验中，大部分与原地水产生的TEP呈正相关。与2006年9月和滚筒式水槽实验相比，2004年10月的天然样品对凝集素刀豆蛋白A的亲和力比对利姆林的亲和力大得多。TEP的化学成分可能解释了它们与鞭毛虫的关系。在三个航次中，有两个航次的平均生物量高于细菌，但与细菌相比，它们的出现频率较低，分布也更零散。
Thraustochytrid protists are often abundant in coastal waters. However, their population dynamics and substrate preferences in the oceanic water column are poorly understood. We studied the abundance and distribution of thraustochytrids, bacteria and TEPs in the equatorial Indian Ocean waters during September 2003, October 2004 and September 2006. Thraustochytrids and bacteria were abundant, suggesting high biological productivity of the region. Thraustochytrids were positively related to bacteria during October 2004 but not at other times, suggesting overlapping or varying substrate preferences at different times. Thraustochytrid and bacteria were positively related to TEPs only in a few stations during October 2004, but were mostly positively related to TEPs generated from in situ water in a roller table experiment. TEPs from natural samples during October 2004 had a much greater affinity to the lectin Concanavalin A than to Limulin compared with those in September 2006 and from the roller tank experiments. The chemical composition of TEPs might explain their relationship with thraustochytrids. Thraustochytrids averaged a higher biomass than bacteria in two of the three cruises, but were less frequent and more patchily distributed compared with bacteria.