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Dynamics of community structure and phosphate status of picocyanobacterial populations in the Gulf of Aqaba, Red Sea

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UNSPECIFIED (2005) Dynamics of community structure and phosphate status of picocyanobacterial populations in the Gulf of Aqaba, Red Sea. LIMNOLOGY AND OCEANOGRAPHY, 50 (1). pp. 363-375.

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > QH Natural history
G Geography. Anthropology. Recreation > GC Oceanography
Journal or Publication Title: LIMNOLOGY AND OCEANOGRAPHY
Publisher: AMER SOC LIMNOLOGY OCEANOGRAPHY
ISSN: 0024-3590
Official Date: January 2005
Dates:
DateEvent
January 2005UNSPECIFIED
Volume: 50
Number: 1
Number of Pages: 13
Page Range: pp. 363-375
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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