ﺮرﺳﯽ ﺗﻐﯿﯿﺮات رﯾﺨﺘﯽ ﺟﻮﯾﺒﺎرﻣﺎﻫﯽ ﺳﻔﯿﺪرود Oxynemacheilus bergianus, Derzhavin, 1934 در دو ﺣﻮﺿﻪ آﺑﺮﯾﺰ درﯾﺎي ﺧﺰر و درﯾﺎﭼﻪ ﻧﻤﮏ ﺑﺎ اﺳﺘﻔﺎده از روش رﯾﺨﺖ ﺳﻨﺠﯽ ﻫﻨﺪﺳﯽ

Morphological variations of Oxynemacheilus bergianus (Derzhavin, 1934) in two inland water basins of Iran using geometric morphometric method

ﺟﻮﯾﺒﺎرﻣﺎﻫﯽ ﺳﻔﯿﺪرود )Oxynemacheilus bergianus( در ﭼﻨﺪﯾﻦ ﺣﻮﺿﻪﻫﺎي آﺑﺮﯾﺰ اﯾﺮان ﯾﺎﻓﺖ ﻣﯽ ﺷﻮد. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﭘﺮاﮐﻨﺶ ﺑﺎﻻي آن، ﻣﻄﺎﻟﻌﻪ ﺣﺎﺿﺮ ﺑﻪ ﻣﻨﻈﻮر ﺑﺮرﺳﯽ ﺗﻨﻮع رﯾﺨﺘﯽ آن در دو ﺣﻮﺿﻪ درﯾﺎي ﺧﺰر و درﯾﺎﭼﻪ ﻧﻤﮏ ﺑﺎ اﺳﺘﻔﺎده از روش رﯾﺨﺖﺳﻨﺠﯽ ﻫﻨﺪﺳﯽ ﺑﻪ اﺟﺮا درآﻣﺪ. ﺑﺮاي اﯾﻦ ﻣﻨﻈﻮر ﺗﻌﺪاد 115 ﻗﻄﻌﻪ ﻣﺎﻫﯽ از ﭘﻨﺞ ﻣﻨﻄﻘﻪ ﭘﺮاﮐﻨﺶ اﯾﻦ ﮔﻮﻧﻪ )رودﺧﺎﻧﻪﻫﺎي ﺳﻔﯿﺪرود و ﻗﺰل اوزن )ﺣﻮﺿﻪ درﯾﺎي ﺧﺰر(، ﺟﺎﺟﺮود، ﮐﺮدان، ﻗﻢ رود ﺣﻮﺿﻪ درﯾﺎﭼﻪ ﻧﻤﮏ( ﺻﯿﺪ و ﺑﺎ اﺳﺘﻔﺎده از روش رﯾﺨﺖﺳﻨﺠﯽ ﻫﻨﺪﺳﯽ ﻣﻮرد ﻣﻘﺎﯾﺴﻪ ﻗﺮار ﮔﺮﻓﺘﻨﺪ. ﻧﺘﺎﯾﺞ ﺑﯿﺎﻧﮕﺮ اﻟﮕﻮﻫﺎي ﺷﮑﻠﯽ ﮐﺎﻣﻼً ﻣﺘﻨﻮع در ﺑﯿﻦ ﺟﻤﻌﯿﺖﻫﺎي ﻣﻮرد ﺑﺮرﺳﯽ ﺑﻮد. ﻧﺘﺎﯾﺞ ﻫﻤﭽﻨﯿﻦ ﻧﺸﺎندﻫﻨﺪه اﺧﺘﻼف ﻣﻌﻨﯽدار ﺑﯿﻦ ﺷﮑﻞ ﺑﺪن ﻣﺎﻫﯿﺎن رودﺧﺎﻧﻪﻫﺎي ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﺑﻮد. ﻋﻤﺪه ﺗﻔﺎوت ﻫﺎي ﻣﺸﺎﻫﺪه ﺷﺪه درﺑﯿﻦ ﺟﻤﻌﯿﺖﻫﺎي ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﻣﺮﺑﻮط ﺑﻪ ﻃﻮل و ﻋﻤﻖ ﺳﺎﻗﻪ دﻣﯽ، ارﺗﻔﺎع ﺑﺪن، ﻃﻮل ﺳﺮ و ﺟﺎﯾﮕﺎه ﺑﺎﻟﻪﻫﺎي ﭘﺸﺘﯽ، ﻣﺨﺮﺟﯽ و ﺳﯿﻨﻪاي ﺑﻮد. اﻟﮕﻮﻫﺎي ﺷﮑﻠﯽ ﻣﺸﺎﻫﺪه ﺷﺪه ﻣﯽﺗﻮاﻧﺪ ﺑﯿﺎﻧﮕﺮ ﺟﺪاﯾﯽ رﯾﺨﺘﯽ واﺑﺴﺘﻪ ﺑﻪ زﯾﺴﺘﮕﺎه و ﻓﻮاﺻﻞ ﺟﻐﺮاﻓﯿﺎﯾﯽ ﺑﺎﺷﺪ ﮐﻪ روش رﯾﺨﺖﺳﻨﺠﯽ ﻫﻨﺪﺳﯽ ﺑﻪدﻟﯿﻞ ﺗﻮاﻧﺎﯾﯽ ﺑﺎﻻ در ﺗﻔﮑﯿﮏ وﯾﮋﮔﯽﻫﺎي رﯾﺨﺘﯽ ﻗﺎدر ﺑﻪ ﺗﻔﮑﯿﮏ آنﻫﺎ ﺑﻮد.

Oxynemacheilus bergianus is found in several inland water basins of Iran. Due to its wide distribution, this study was conducted to investigate its morphological variation in basins of Caspian Sea and Namak Lake of Iran using geometric morphometric technique. For this purpose, a total of 115 specimens from five river (Sefid and Ghezel Ozan (Caspian Sea basin), Jajrood, Kordan, Qom (Namak Lake basin)) were caught and compared using geometric morphometric method. The results indicated a completely different body shape patterns in the studied populations. The results also showed a significant difference between the body shape of the studied and groups the most differences were related to tail length and depth, body depth, head length and position of the dorsal, anal and pectoral fins. The observed shape patterns can indicate habitat-dependent morphological separation and geographical distances that the geometric morphometric method was highly capable of separating morphological features due to their high capability.