Dynamics of community structure and phosphate status of picocyanobacterial populations in the Gulf of Aqaba, Red Sea
Dynamics of community structure and phosphate status of picocyanobacterial populations in the Gulf of Aqaba, Red Sea
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DOI：
10.4319/lo.2005.50.1.0363
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发表时间：
2005-01-01
影响因子：
4.5
通讯作者：
Scanlan, DJ
中科院分区：
文献类型：
--
作者：
Fuller, NJ;West, NJ;Scanlan, DJ
利用DNA探针和抗P胁迫分子标记蛋白PstS的抗体，对1999-2000年红海亚喀巴湾原绿球藻和聚球藻种群的遗传多样性和磷状态进行了监测。全年未见常见的春季聚藻藻华，4 - 12月浮游植物以原绿球藻为主。原绿球藻的一种高光（HL）适应生态型HLII占主导地位，这种优势甚至在一年的大部分时间里延伸到光带的底部。适应弱光（LL）的生态型仅在7 - 10月出现，且局限于水深50 m以上的水域。聚珠球菌种群也以单一支系（11支系）为主，但在6月份出现了支系III基因型的高峰。聚藻球菌和原绿球藻群体的PstS在急性缺营养的夏季表达最高，而在冬季和春季表达较低，表明磷胁迫。原绿球藻的丰度不受磷胁迫的影响，仅随着冬混的开始而下降，而聚球菌的丰度可能在1999年5月因磷胁迫而下降。
We monitored the genetic diversity and phosphate (P) status of Prochlorococcus and Synechococcus populations during an annual cycle (1999-2000) in the Gulf of Aqaba, Red Sea, using DNA probes and antibodies against the protein PstS, a molecular marker of P stress. The usual spring Synechococcus bloom was not observed in this year, and the picophytoplankton was dominated by Prochlorococcus from April to December. A single high light (HL)-adapted ecotype of Prochlorococcus, HLII, dominated, and this dominance extended even to the base of the euphotic zone for much of the year. Low light (LL)-adapted ecotypes only appeared between July and October and were confined to waters deeper than 50 m. The Synechococcus population was also dominated by a single clade (clade 11), with the exception of a peak of clade III genotypes in June. Highest PstS expression from the collective Synechococcus and Prochlorococcus populations, indicative of P stress, was observed during the acutely oligotrophic summer, whereas low expression occurred during the winter and spring. Prochlorococcus abundance appeared unaffected by P stress and only decreased with the beginning of winter mixing, whereas P stress might have caused the decline of the Synechococcus population in May 1999.