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Ecobiolgical Study of Mazandaran Coastal Water of the Caspian Sea (2012-2013)
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Asieh Makhlough   , Hassan Nasrollahzadeh Saravi , Fereshteh Eslami , Maryam Mosavi |
| , hnsaravi@yahoo.com |
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Abstract: (8799 Views) |
| This study was conducted to determine some of the environmental parameters, phytoplankton
abundance and diversity, and their temporal fluctuations in the Mazandaran coastal waters of the Caspian
Sea. Samples were collected from surface waters from 5m to 30 m depth in 2012-2013. Results showed
that the mean values of water temperature, salinity, transparency, pH and dissolved oxygen were
19.46±0.85ºC, 12.35±0.13 psu, 2.63±0.18 m, 8.51±0.02 and 6.00±0.07 ml/l, respectively. Percentage of
dissolved organic nitrogen and phosphorous were higher than 80% and 46, respectively. The mean value
of dissolved silicon (DSi) was 9.5± 0.2 μM. In addition, the results showed that 112 species contributed in
phytoplankton community structure. Mean abundance of phytoplankton was 164 ±32 million Cells/m3. In
January and March, the mean abundance of phytoplankton was 5 times higher than other months.
Bacillariophyta with 89 percent of total abundance was the dominant phylum and Pyrrophyta was the
second one. The third and fourth dominant phyla were Cyanophyta and Chlorophyta, respectively.
Chaetoceros throndsenii was the first dominant species in May, June and August. However, the first
dominant species in November, January and March were Thalassionema nitzschioides, Skeletonema
costatum and Pseudonitzschia seriata, respectively. Statiscal analysis showed that temporal biotic and
abiotic parameters were significantly different. Meanwhile, Pearson correlations test indicated the
significant correlation between water temperature and phosphorous, nitrate and ammonium ions and major
dominant species of each month. The environmental stress and instability of ecosystem were a benefit to
species with blooming potential such as Chaetoceros throndsenii and Pseudonitzschia seriata. They
increased their abundance in favorite water temperature and nutrients. |
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| Keywords: Environmental parameters, Phytoplankton, Bloom, Caspian Sea, Mazandaran Province. |
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Full-Text [PDF 139 kb]
(2063 Downloads)
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Type of Study: Research/ Original/ Regular Article |
Received: 2014/12/28 | Revised: 2015/02/28 | Accepted: 2014/12/28 | ePublished: 2014/12/28
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