Publication Date:
2021-05-19
Description:
The present project in related to survey of factors and hydrology and hydrochemical features (water temperature,
dissolve oxygen saturation, pH, clearance, salinity, nitrogen, phosphorus and silicon) hydrobiology
(zooplankton, phytoplankton, macrobenthos) and survey of bio environment pollution (oil, heavy metal, detergent) executed in lower 10m in different water larger in southern Caspian Sea in 2002-2003. For sampling 8
lines number were vertical on coast that selected from Astra in west to Gomishan in east in southern Caspian Sea
basin. The result indicated the average physical factors such as pH were 8.11 and salinity12.12 ppt ,and disolve
oxygen6.7 mg/l. Average chemical factors such as NO2 , NO3 and NH4 were 1.2 µg/l, 25.7 µg/l, 13 µg/l
respectively.Total nitogen and organic nitrogen and inorganic nitrogen were 690.2 µg/l , 667.6 µg/l , 41.6 µg/l. Average silicat were recrded 266.35 µg/l . Total Phosphorus was observed 37.35 µg/l and average of organic
Phosphorus concentration was and 20.25 µg/l .Average of Total organic matter (T.O.M) was 4.98% maximum
amount were observed in Lisar and minimum in Nooshahr . Concentration of heavy metal during sampling were
respectively ,Fe〉Mn〉Zn〉Cr〉Ph〉Co〉Cd〉Cu. Maximum concentration of Fe were determined in winter in
Nooshahr and Babolsar respectively 13/3 µg/l 17/1 µg/l. In many stations and different Season, the amount of
heavy meta were lower standard of in marine water. The concentration of oil hydrocarborate ( PAHs) in autumn
was 0/13 ppb and in winter 0/12 ppb. The amount of ( PAHs) in Southern Caspian Sea were Lower than other
parts of Caspian Sea.
The average of detergent concentration ( LAS) was 0/036 µg/l that was two fold higher than determined in
2001. Total 107 species of phytoplankton belong to 5 phylum were identified. The numbers of species of
phytoplankton groups were respectively, chrysophyta (42 species), cyanophyta (17 species), pyruphyta (17
species), chlorophyta (21 species) and euglenophyta (9 species). The maximum diversity of phytoplankton
observed in summer and minimum in autumn. High diversity of chrysophta and cyanophyta observed in summer
and phyrophyta and chrlophyta in spring. The composition of phytoplanhkton groups were respectively, chrysophyta (70%), phyrophyta (9%) and chlorophyta (7%) and euglonophyta (1%).
Maximum density of phytoplankton was observed in autumn and minimum in winter.
Total 19 species of Zooplankton were identified. Maximum diversity was observed in summer and minimum in
winter. Zooplankton changes during sampling, showed amount of density of zooplankton in 5m were more than
10 m depths. Total (17 species macrobenthos were identified. The composition of macrobenthos groups were respectively , Annalida (92/7% ) , Bivalvia (2/7%) gumarida (108%) cumacea ( 1/5%) , Balanidae 103% . max . density were
observed in Astara and min . in Sefied roud Average of density were 1218 0/851 ind /m2 and biomass 14 15
g/m2 High density were recorded in autumn and low density in winter . Correlation of phytoplankton and
zooplankton with physicochemical parameter and also relation between total organic matter and sediment grain
size were calculated.Ecological indicies (simpson diversity evenns diversity and shanoon-wiever diversity) were
calculated for macrobenthos. Data were shown impact of cetenephora (Mnenemiopsis leidyi) on zooplankton
and phytoplankton and macrobenthos density.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Phytoplankton
;
Zooplankton
;
Macrobenthos
;
Heavy metals
;
Pollution
;
Oil pollution
;
Detergent
;
Hydrology
;
Hydrochemistry
;
Species
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
111pp.
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