Seasonal variations in primary productivity and biomass of phytoplankton in the waters of the southern part of the general estuary / Dhi Qar/Iraq

Document Type : Research Paper


1 Department of biology, College of Sciences, University of Thi Qar, Iraq

2 Department of biology, College of Education For Grils, University of Thi Qar, Iraq

3 Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, Russia



The Current study estimated the primary productivity and identified the biological characteristics associated with it by measuring chlorophyll-a and phytovitin-a in the southern part of the general estuary in Dhi Qar Province, Iraq on a seasonal basis for the period from autumn 2020 to summer 2021. three stations were selected: The first station (St. 1) was located beside the Al-Hollandi bridge, the second (St. 2) was 20 km far from the south of St. 1, adjacent to the siphon pump, and the third (St. 3) was 20 km from the south of St. 2, close to the sub-channel that feeds the marshes.  The biological characteristics indices showed an obvious variation in the different stations and seasons. The productivity values in the general estuary, south of Nasiriyah City ​​ranged between 38.99 - 130.05 mg carbon m -3 hour-1. These values ​​showed two peaks during the fall and spring. The chlorophyll-a and phytovitin-a concentrations ​​ranged between 3-6.44 µg L-1 and 0.66-3.22 µg L-1, respectively. The highest concentrations of both pigments were found in St. 1. In addition, the highest concentration of chlorophyll-a (6.44 mg L-1) during autumn at St. 1, while the highest concentration of phaeophytin-a (3.22 mg L-1) during winter at St. 2. The lowest concentration of chlorophyll-a (3 mg L-1) was at St. 1, in winter, while the lowest of phaeophytin-a (0.66 mg L-1)   during spring at St. 3. In general, the autumn and spring was marked by the highest concentration of chlorophyll a, while the winter and summer by the highest phaeophytin.


Al Essa, SA, Abdullah, AA & Adel QJ 2007, Primary productivity of phytoplankton within the northern part of the Shatt Al-Arab River - southern Iraq. Basra Journal of Agricultural Sciences, 20: 287. 
Al Hamdawi, AOS 2006, Primary productivity and environmental factors affecting it in the Dagara River /Al-Diwaniyah, Iraq. MSc. Dissertation, College of Education, University of Al-Qadisiyah, 147 p. 
Al Hamim, FHI 1989, The science of fresh water.  Ministry of Higher Education and Scientific Research, University of Basra, 218 p.  
Al Handal, AY, Mohamed, AR & Abdullah, DS 1992, Phytoplankton production and related ecological factor's in the Shatt Al-Basrah canal, south Iraq. Mesopotamia, 7: 35-48. 
Alimov, AF 2000, Elements of the theory of functioning of aquatic ecosystems stem. Nauka Publishing. House, St. Petersburg: 147 p. (in Russian).
Al Jandil, KKF 2001, An environmental study of the southern section of the Euphrates River at the city of Nasiriyah, MSc. Dissertation, Basra University, Iraq, 47 p. 
Al Kinani, ZMI 2011, A quantitative, qualitative and environmental study of phytoplankton in the Euphrates River in the city of Nasiriyah. MSc. Dissertation, Dhi Qar University, Di Qar, Iraq. 
Al Lami, AA, Al Saadi, HA, Kassim, TI & Al Aubaidi, KH 1998, On the limnological features of Euphrates river Iraq. Journal of Education and Science, University of Mosul, 29: 38-50. 
Al Lami, AA, Kassim, TI & Salman, SK 2000, Phytoplankton of Tigris river, Iraq. First National Scientific Conference in Environment Pollutio Protection, Baghdad, Iraq, 5-6: 10-20. 
Al Lami, AAb 1986, An ecological study on phytoplankton for some marshlands in southern Iraq.  MSc. Dissertation, College of Science, University of Basra, Iraq, 144 p. 
Allen, J, Robert, DR & Onathan, W 2000, Practical skills in environmental science, 295 p. Retrieved by:
Al Mousawi, AH, Al Saadi, HA & Hassan, FM 1994, Spatial and seasonal variations of phytoplankton population and related environments in Al-Hammar marsh, Iraq. Basrah Journal of Science, 12: 6-20. 
Al Saadi, HA & Antoine, SE 1981, Primary productivity and phytoplankton population dynamics of polluted Ashar canal and shatt Al-Arab, Basrah, Iraq. Verhandlungen des Internationalen Verein Limnologie, 21: 880-885.
Al Saadi, HA 1993, Primary productivity of phytoplankton in water bodies in Iraq, Mesopotamia Journal.  
Al Saadi, HA, Pankow, H & Huq, M 1979, Algological investigation in the Polluted Ashar Canal and Shatt Al-Arab in Basrah (Iraq). International Review of Hydrobiology, 64: 527-540. 
Al Sabunji, AA 1998, Benthic algae as a biological evidence of organic pollution in the Shatt al-Arab and some of its canals. PhD Dissertation, College of Agriculture, University of Mosul, 108 p. 
Al Sha'ban, AAG 1999, Primary productivity of benthic microalgae in Shatt Al-Arab.  PhD Dissertation, College of Science, University of Basra, 92: 254-276.  
Amarasinghe, PB & Vijverberg, J 2002, Primary production in a tropical reservoir in Sri Lanka. Hydrobiologia, 487: 85-93.
APHA (American Public Health Association) 1976, Standard methods for the examination of water and waste water. 14th Edition, AWWA, WPCF, USA, 541 p. 
Barber, RT & Hilting, AK 2002, History of the study of plankton productivity. In PJ, Williams, DN, Thomas & CS, Reynolds (eds.), Phytoplankton productivity, carbon assimilation in marine and freshwater ecosystems, Blackwell Science, Oxford: 16-43.
Barlow, RG 1980, The biochemical composition of phytoplankton in an upwelling region of South Africa. Journal of Experimental Marine Biology and Ecology, 45: 83-93.
Goldman, CR 1965, Primary productivity in aquatic environments. Mere. Ist Italian Hydrobiology, 18 Supplement, University of California. Press, Berkeley, 464 p.
Gowda, G, Gupta Rajesh, TR, Gowda, KM, Lingadhal, C & Ramesh, AM 2002, Distribution of phytoplankton pigment in the Nethravathi estuary. Indian Journal of Fisheries, 49: 267-273.
Joint, IR & AJ, Pomory, 1981, Primary production in a turbid Estuary. Estuarine Coastal and shelf Science, 13: 303-316.
Karlstron, U & Backlund, S 1977, Relationship between algal cell number, chlorophyll-a and fine particulate organic matter in a river in northern Sweden. Atherosclerosis Risk in Communities Hydrobiologia, 80: 192- 199. 
Kiss, KT, Acs, EA & Kovacs, A 1994, Ecological observation on skeletonema potamos (weber) Hasle the river Danube, near Budapest (1991- 1992, daily investigation).  Hydrobiologia, 289: 163-170. 
Kling, HJ, Mugidde, R & Hecky, RE 2001, Recent changes in the phytoplankton community of Lake Victoria in response to eutrophication In: M, Munawar & RE, Hecky (eds.) The great lakes of the World (Glow): Food- web Health and Integrity, Backhuys Publishers Leiden the Netherlands: 47-65.
Kumari, LK, Bhattathiri, PMA, Matondkar, SGP & John, J 2002, Primary productivity in Mandovi-Zuari estuaries in Goa. national institute of oceanography. Dona Paula, Goa. Journal of the Marine Biological Association of India, 44: 1-13.                                           
Lindemann, R 1942, The trophic-dynamic aspect of ecology. Ecology, 23: 399-417.
Lith, H 1975, Historical survey of primary productivity research. In Lieth, H. & R. H. Whittaker (eds.), Primary Productivity of the Biosphere. Springer, New York: 7–16.
Lohrenzl, SE, Ahnenstiel, GL, Donald, GE, Lang, GA, Chenl, X & Agg,  MJ 1997, Variations in primary production of northern Gulf of Mexico continental shelf waters linked to nutrient inputs from the Mississippi River. Marine Ecology Progress Series, 155: 45-54.
Macfadyen, A 1948. The meaning of productivity in biological systems. Journal of Animal Ecology, 17: 75-80.
Macintyre, HL & Cullen, JJ 1996, Primary production by suspended and benthic Microalgae in a turbid estuary: Time- scales of variability in Saint Antonio Bay, Texas. Marine Ecology Progress Series, 145: 245-268.
Metloop, TH 2004a, Environmental study on phytoplankton in the drains of the northern part of the public estuary.  MSc. Dissertation, College of Science, University of Baghdad.
Metloop, TH 2004b, Environmental study on zooplankton in some sewers in the northern part of the general estuary.  MSc. Dissertation, College of Science, University of Baghdad, 94 p.
Mugidde, R 1993, The increase in phytoplankton primary productivity and biomass in Lake Victoria, Limnologia, 25: 846-849.
Nair, VR, Mustafa, S, Metha, P, Govindan, K, Ram, MJ & Gajbhiye, SN 1998, Biological characteristics of the Vashishishti estuary, Maharash Tra. Indian Journal of Marine Sciences, 27: 310-316. 
RD 52.24.784 2013 Mass concentration of chlorophyll a. Measurement technique by spectrophotometric method with standard extraction.
Sakshaug, E, Bricaud, A, Dandonneau, Y, Falkowski, PG, Kiefer, DA, Legendre, L, Morel, A, Parslow, J & Takahashi, M 1997, Parameters of photosynthesis: definitions, theory and interpretation of results. Journal of Plankton Research, 19: 1637-1670
Umani, SF & Beran, F 2003, Several variations in the dynamics of microbial plankton communities. First estimates from experiments in the Gulf of Trieste, Northern Adriatic Sea. Limnology and Oceanography, 247:1-16. 
Vollenweider, RA 1968, Water management research, Scientific fundamentals of eutrophication of lakes and flowing water with particular reference to nitrogen and phosphorus as factors in eutrophication, Organization for Economic Co-operation and Development, Directorate for Scientific Affairs, Paris, Mimeographed, 159 p.
Vollenwieder, RA.1974, A manual on methods measuring primary production in an aquaculture environment. IBP Handbook, No. 12, Blakwell, Oxford, 213 p.