چكيده فارسي :
اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﻣﻨﻈﻮر ﺑﺮرﺳﯽ ﺗﻨﻮع، ﺗﺮاﮐﻢ و ﭘﺮاﮐﻨﺶ ﻓﯿﺘﻮﭘﻼﻧﮑﺘﻮن درﯾﺎﭼﻪ ﺳﺪﻻر و ﺗﻐﯿﯿﺮات آن ﻫﺎ ﻃﯽ 3 ﻣﺮﺣﻠﻪ ﻧﻤﻮﻧﻪﺑﺮداري از ﺗﯿﺮﻣﺎه اﻟﯽ ﺷﻬﺮﯾﻮرﻣﺎه ﺳﺎل 1393 اﻧﺠﺎم ﭘﺬﯾﺮﻓﺖ. ﻧﻤﻮﻧﻪﻫﺎ ﭘﺲ از ﺟﻤﻊ آوري، ﺑﺎ ﻓﺮﻣﺎﻟﯿﻦ 4 درﺻﺪ ﺗﺜﺒﯿﺖ و ﺑﺎ ﻣﯿﮑﺮوﺳﮑﻮپ ﻫﺎي ﻣﻌﮑﻮس و ﻧﻮري ﻣﻌﻤﻮﻟﯽ ﺷﻨﺎﺳﺎﯾﯽ و ﺷﻤﺎرش ﺷﺪﻧﺪ. از ﺑﯿﻦ ﺟﻨﺲﻫﺎي ﺷﻨﺎﺳﺎﯾﯽ ﺷﺪه، 8 ﺟﻨﺲ ﻣﺮﺑﻮط ﺑﻪ دﯾﺎﺗﻮﻣﻪ ﻫﺎ، 7 ﺟﻨﺲ ﻣﺮﺑﻮط ﺑﻪ ﺟﻠﺒﮏﻫﺎي ﺳﺒﺰ، 3 ﺟﻨﺲ ﻣﺮﺑﻮط ﺑﻪ دﯾﻨﻮﻓﯿﺴﻪ، 1 ﺟﻨﺲ ﻣﺮﺑﻮط ﺑﻪ ﺷﺎﺧﻪ اوﮔﻠﻨﻮﻓﯿﺴﻪ و 5ﺟﻨﺲ ﻣﺮﺑﻮط ﺑﻪ ﺷﺎﺧﻪ ﺳﯿﺎﻧﻮﺑﺎﮐﺘﺮ ﺑﻮدﻧﺪ. اﻧﻮاع ﺟﻠﺒﮏﻫﺎي ﺷﺎﺧﻪ دﯾﺎﺗﻮم ﺑﺎ 88/59 درﺻﺪ ﺑﯿﺸﺘﺮﯾﻦ ﺟﻤﻌﯿﺖ ﺗﺎﺑﺴﺘﺎﻧﻪ را ﺗﺸﮑﯿﻞ دادﻧﺪ. ﺟﻨﺲ ﻏﺎﻟﺐ اﯾﻦ ﺷﺎﺧﻪ در دوره ﻣﻄﺎﻟﻌﻪ Asterionellaﺑﻮد. ﺳﺎﯾﺮ ﺟﻨﺲﻫﺎي اﯾﻦ ﺷﺎﺧﻪ ﺑﻪ ﺗﺮﺗﯿﺐ ﻓﺮاواﻧﯽ Cyclotella ، Nitzschia ، Cymbella ،Melosira ،Navicula ، Synedraو Diatoma ﺑﻮد. ﺷﺎﺧﻪ ﺟﻠﺒﮏﻫﺎي ﺳﺒﺰ ﺑﺎ ﻓﺮاواﻧﯽ 6/48 درﺻﺪ ﺑﺎ ﺟﻨﺲﻫﺎي Pandorina ، Oocystis ،Closterium ،Scenedesmus ، Chodatella ،Gonium و Chlorella در رده دوم اﻫﻤﯿﺖ ﻗﺮار داﺷﺖ. ﺳﺎﯾﺮ ﺷﺎﺧﻪﻫﺎي ﻓﯿﺘﻮﭘﻼﻧﮑﺘﻮن ﻣﺸﺎﻫﺪه ﺷﺪه در ﻣﺪت ﻣﻄﺎﻟﻌﻪ ﻋﺒﺎرت ﺑﻮدﻧﺪ از ﺳﯿﺎﻧﻮﺑﺎﮐﺘﺮ ﺑﺎ ﻓﺮاواﻧﯽ 2/88 درﺻﺪ و ﺷﺎﻣﻞ ﺟﻨﺲﻫﺎي Merismopedia ، Anabaena ، Oscillatoria ،Gleocapsa و Coelosphaerium ﺑﻮد. ﺟﻠﺒﮏﻫﺎي دﯾﻨﻮﻓﯿﺴﻪ ﺑﺎ ﻓﺮاواﻧﯽ 1/76 درﺻﺪ و ﺟﻨﺲ ﻫﺎي Peridinium، Gymnodinium و Ceratium و در ﻧﻬﺎﯾﺖ ﺟﻠﺒﮏﻫﺎي اوﮔﻠﻨﻮﻓﯿﺴﻪ ﺑﺎ ﻓﺮاواﻧﯽ ﻧﺎﭼﯿﺰ 0/25 درﺻﺪ و ﺟﻨﺲ Euglena. ﻣﻮرد ﺷﻨﺎﺳﺎﯾﯽ ﻗﺮار ﮔﺮﻓﺘﻨﺪ. ﻃﯽ ﻣﺪت ﻧﻤﻮﻧﻪ ﺑﺮداري ﺑﺎﻻﺗﺮﯾﻦ ﻣﯿﺎﻧﮕﯿﻦ ﺗﺮاﮐﻢ ﻣﺮﺑﻮط ﺑﻪ ﺟﻠﺒﮏﻫﺎي دﯾﺎﺗﻮم ﺑﺎ ﺗﻌﺪاد 2± 1560733 ﻋﺪد در ﻟﯿﺘﺮ و ﺟﻨﺲ Asterionella ﭘﻼﻧﮑﺘﻮن ﻏﺎﻟﺐ اﯾﻦ ﺷﺎﺧﻪ ﺑﻮد. رﺗﺒﻪ دوم ﻣﺘﻌﻠﻖ ﺑﻪ ﺷﺎﺧﻪ ﺟﻠﺒﮏ ﻫﺎي ﺳﺒﺰ ﺑﺎ ﻣﯿﺎﻧﮕﯿﻦ ﺗﻌﺪاد2± 164600 ﻋﺪد در ﻟﯿﺘﺮ و ﺟﻨﺲﻫﺎي ﻏﺎﻟﺐ آن Scenedesmus ، Pandorina و Chlorella ﺑﻮد. در ﻣﺠﻤﻮع ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﭘﺎﯾﯿﻦ ﺑﻮدن ﺗﻨﻮع ﭘﻼﻧﮑﺘﻮﻧﯽ در ﻓﺼﻞ ﺗﺎﺑﺴﺘﺎن و دوره ﻧﻤﻮﻧﻪ ﺑﺮداري ﺑﻪ ﻧﻈﺮ ﻣﯽ رﺳﺪ ﺗﻮان ﺗﻮﻟﯿﺪ ﭘﻼﻧﮑﺘﻮﻧﯽ در درﯾﺎﭼﻪ ﭘﺸﺖ ﺳﺪ ﻻر در ﺣﺪ ﭘﺎﯾﯿﻨﯽ ﻗﺮار داﺷﺘﻪ ﺑﺎﺷﺪ.
چكيده لاتين :
In this study, in order to investigate limnological and biological parameters of Lar dam lake such as indentification determination of the density and distribution of phytoplanktons, sampling were done during 3 months (July-August-September) and fixed in formalin 4% and transferred to laboratory for further investigation under inverted microscope. In this study, 24 genera which belonged to 5 phytoplanktonic phyla were identified. Among these genera, 8 were belonged to Ochriphyta, 7 generaus was belonged to Chlorophyta, 3 genera were belonged to Dinophyta, 1 genera were belonged to Euglenophyta, 5 generaus was belonged to Cyanobacteria. In this reservoir dam, Ochriphyta was the dominant phytoplanktom phylum with being annually 88.59% of the population, and followeding by genera Asterionella was dominat samples. The others Other phytoplanktonic phylla were: Chlrophyta, Cyanobacteria, Dinophyta and Euglenophyta with following frequencies: of 6.48%, 2.88%, 1.76% and 0.25% respectively, followed by the and following genera: (Pandorina, Scendemus, Closterium, Oocystis, Gonium, Chodatella and Chlorella), (Anabaena, Merismopedia, Oscillatoria, Gleocapsa, and Coelosphaerium), (Peridinium, Gymnodinium and Ceratium) and (Euglena). In all of the sampling months, the highest average density was belonged to Ochriphyta with 1560733 number per liter and the dominant genus of this phyllum which was observed in high number during in a months, was Asterionella. After that was, followed by Chlorophyta with average number of 164600 per liter and its dominant genera were Scenedesmus, Pandorina and Chlorella, respectively. Biological studies indicated that this reservoir had low planktonic generation potential.
