Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2008.1179.1193Nasrollahzadeh SaraviHasan Bin DinZubir MakhloughAsieh 92008119Temporal variations and regional distributions of dissolved
nutrients and their elemental ratios in the Iranian coastal waters of
the Southern Caspian Sea were investigated. The data were collected in
1996-97 (Phase I, as a background data and undisturbed ecosystem) and
in 2005 (Phase II, as a disturbed ecosystem) at sampling points (from
10 to 100 m depths). In addition to the two main sampling exercises, additional
sample collections were carried out during the period of 1994 to 2004
as a long-term study. This study showed that the dissolved inorganic nitrogen/dissolved
inorganic phosphorus (DIN/DIP) ratios in the southern Caspian Sea vary
within a very narrow range (4.47 to 5.78) within the euphotic and aphotic
layers and is by one order of magnitude lower than what have been reported
for several other marine ecosystems. Phytoplankton growth seems to be
nitrogen limited while the levels of P and Si always remain high. Factor
Analysis/Principal Component Analysis (FA/PCA) of the correlation matrix
showed that the nitrogen compounds are associated with the main factor
accounting for 25.7-26.2% of the total variance for both the sampling
periods. During Phase I, the Chrysophyta were the major group, whereas
during Phase II the proportion of Chrysophyta in the total community progressively
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