This study focuses on spatial and temporal distribution and species composition of phytoplankton in the south-western Caspian Sea between July 2009 and March 2010. Samples were collected from 11 stations along three transects: Lisar, Anzali and Sefidrood. Among 44 identified phytoplankton species, diatoms (70.2%) and cyanophytes (25.0%) were dominant. The average phytoplankton abundance was calculated as 1.085E + 05 cells l−1. Among the phytoplankton groups, diatom density was higher (70.2%) than two out of three of total abundance in density of 1.085E + 05 cells l−1. Cyanophytes were the second important group (25.0%) contributing to total phytoplankton. Dinoflagellates, chlorophytes and euglenoids were other contributors to total phytoplankton. Diatoms Dactyliosolen fragilissimus and Skeletonema costatum and cyanophyte Oscillatoria sp. numerically dominated in the system. There were major changes in phytoplankton composition and average phytoplankton density was higher than those documented in 1996–1997 and 2005. The average concentrations of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP) and dissolved inorganic silicate were 14.5 ± 6.32, 1.14 ± 0.44 and 5.10 ± 3.98 μM, respectively, and these concentrations were strikingly high. Increases in DIN and DIP concentrations were more than twofold compared to recorded values during the last 2 decades due to the eutrophication. Fluctuations in nutrients played an important role in the variation of phytoplankton composition and abundance. Chlorophyll-a concentrations varied between 3.22 and 16.1 μg l−1 and there was a significant increase in chlorophyll-a (8.13 ± 5.72 μg l−1) compared to the values in 1996–1997 (1.44 ± 1.48 μg l−1), 2001 (2.62 ± 1.48 μg l−1) and 2005 (2.14 ±1.94 μg l−1).
This study, accomplished is focused on the spatial and temporal distribution and species composition of phytoplankton in the southwestern Caspian Sea between January 2008 and December 2008. Samples were collected from 11 stations along three transects known as Lisar, Anzali and Sefidrood. This study identified 43 phytoplankton species comprised of diatoms (25 species), dinoflagellates (7 species), chlorophytes (6 species), cyanophytes (4 species), and euglenoids (1 species) were identified. The study showed, diatom Dactyliosolen fragilissimus and the dinofllagelate Prorocentrum cordatum numerically dominate the southwestern Caspian Sea. The annual average phytoplankton density was calculated as 2.35E+04 ± 1.63E+04 Cell L -1 , with the maximum value recorded in the winter (4.50E+04 ± 3.90E+04 Cell L -1 ). Diatoms were dominant during the autumn and winter (77.0% and 96.0%, respectively), while dinoflagellates were prevalent during the spring and summer (89.0% and 86.0%, respectively). The annual average chlorophyll a was calculated as 9.26±3.54 μg L -1 , with the maximum values were recorded in the winter (16.9±5.60 μg L -1 ). This is supported by the Spearman rank correlation result between phytoplankton abundance and chlorophyll a (r=0.551). The high phytoplankton cell density and chlorophyll a concentration coincided with the poor species composition. Güney Batı Hazar Denizi'nde Fitoplanktonun Tür Kompozisyonu ve Bolluğu ÖzetOcak 2008 ve Aralık 2008 arasında yapılan bu çalışma Güney Batı Hazar Denizi'nde fitoplankton'un uzaysal ve zamansal dağılımları ve tür kompozisyoları üzerine odaklanmıştır. Örnekler Lisar, Anzali and Sefidrood olarak bilinen üç kesit boyunca uzanan 11 istasyon noktasından toplandı. Diatom (25 tür), dinoflagellat (7 tür), klorofit (6 tür), cyanofit (4 tür) ve euglenoidlerden (1 tür) oluşan toplam 43 fitoplankton türü tayin edildi. Çalışma, diatom Dactyliosolen fragilissimus ve dinofllagellat Prorocentrum cordatum türlerinin sayısal olarak Güney Batı Hazar Denizini kontrol ettiğini gösterdi. Yıllık ortalama fitoplankton yoğunluğu kış döneminde kaydedilen maksimum değeriyle (4,50E+04 ± 3,90E+04 Cell L -1 ) 2,35E+04 ± 1,63E+04 Cell L -1 olarak hesaplandı. Dinoflagellatlar ilkbahar ve yaz döneminde (sırasıyla %89,0 ve 86,0), diatomeler sonbahar ve kış dönemi boyunca baskın grup olmuşlardır (sırasıyla 77,0% ve 96,0). Kışın kaydedilen maksimum değeriyle (16,9 ± 5,60 μg L -1 ), yıllık ortalama klorofil a değeri 9,26 ± 3,54 μg L -1 olarak hesaplandı. Bu durum fitoplankton bolluğu ve klorofil a arasındaki Spearman rank korelasyon sonucu (r=0,551) tarafından da desteklenmiştir. Fitoplankton biyomas ve klorofil a yüksek olduğu halde, tür çeşitliliği bakımından fakir olmuştur.
In the above article by S. Bagheri et al., first published online in 13 March 2012, some sections of article were incorrect. The authors supplied some revisions as following:1 Station number presented as "11" in second line of Abstract section has been corrected as "12".
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