Trophic Diatome Index Research Papers (original) (raw)
Diatoms are commonly used as bioindicator for evaluating especially freshwater quality, their used in the biological assessment of rivers in Iraq. Trophic diatom index (TDI) that provided information about state of the aquatic ecosystem.... more
Diatoms are commonly used as bioindicator for evaluating especially freshwater quality, their used in the biological assessment of rivers in Iraq. Trophic diatom index (TDI) that provided information about state of the aquatic ecosystem. In this study, the phytoplankton diatoms were collected from the Tigris River within Wasit province at five sites in June 2015 to May2016. Total of 184 diatom taxa were identified and the water quality of the Tigris River. The results showed the dominancy of some diatomic species such as: Cyclotella meneghiniana, Achnanthe. affins, Anomoeoneis sphaerophora, Amphora bioculata, Cocconies. placentula, C. placentula var euglypta, C. pediculus, Cymatopleura sola C. amphisbaena, Cymbella. tumida, Diatoma vulgare, Fragilaria ulna var acus, Navicula venta, Nitzschia halophila, N.sigmoidea, Rhoicosphenia abbreviata, Surirella robusta and Synedra ulna. These species indicated that the trophic status of the river ranged from oligotrophic to mesotrophic status and the Tigris river was moderate water quality.
The composition and seasonal variations of benthic diatoms of Yedikir Dam Lake were studied using samples collected from two stations between November 2004 and April 2006. The diatom communities were diverse: 81 taxa were found, belonging... more
The composition and seasonal variations of benthic diatoms of Yedikir Dam Lake
were studied using samples collected from two stations between November 2004 and
April 2006. The diatom communities were diverse: 81 taxa were found, belonging
to the Bacillariophyta. In two sampling stations, the most important occurrence was suddenly the increase of epipelic diatoms in May 2005. It was drived from especially three species; Nitzschia fonticola, Navicula veneta and N. capitata var. hungarica.
Trophic Diatom Index (TDI) provides information about trophic levels of the aquatic ecosystem. The water quality of Yedikir Dam Lake in terms of trophic levels was determined according to these 81 diatom taxa by calculating TDI. In particular, it is important that sites in the ‘station 2’, where the water enters dam from Tersakan stream, are chosen so that the influence of the gross effects of organic pollution on the index is minimised.
According to Trophic classification and diversity (TSI, TDI), respectively, ascribed
Yedikir Dam Lake to the eutrophic range. Multivariate analyses indicated that both the regional distribution and seasonal variation of benthic diatoms are mainly driven by nutrient concentration. Diatoms are predominantly affected by geochemical characteristics including pH and mineralisation level.