Seasonal Variation of Phytoplankton Community and Its Relationship with the Occurrence of Zebra Mussel in Euphrates River at Al Musayab City

M. Al Kaabi, Kareem; K. Salman, Suad; J. Ahmed, Mohammed; H. Alaywi, Akram

doi:10.33762/bagrs.2013.112071

	Seasonal Variation of Phytoplankton Community and Its Relationship with the Occurrence of Zebra Mussel in Euphrates River at Al Musayab City
Basrah Journal of Agricultural Sciences
Article 19, Volume 26, 2 (special Issue), 2013, Pages 246-256 PDF (0 K)
DOI: 10.33762/bagrs.2013.112071
Authors
Kareem M. Al Kaabi; Suad K. Salman; Mohammed J. Ahmed; Akram H. Alaywi
Abstract
Seasonal variation of phytoplankton community was studied in Euphrates river at Al Musayab city. This study was carried out at two stations from 2/ 1/ 2009 to 31/ 12/ 2009. Water sample was collected bimonthly to measure: water temperature, PH, salinity and calcium ions concentration, besides identify and the count of phytoplankton groups. The results showed that water temperature ranged between ه 11.5 c in January and ه 32 c in August. PH ranged between 7.05-8 while salinity ranged between 2.49 1.02 ppt. Calcium ions concentration was between 128.5 48.1 mg/ l. 80 species belonged to 42 genus of phytoplankton were recorded at the two stations, including 59 species of diatoms (Bacillarophyta) followed by chlorophyta (13 specie) and Cyanophyta (6 species) and species for both Euglenoaphyta and Pyrrophyta. The highest occurrence of species was recorded in fall (49 species ) while the lowest was recorded in winter (35 species).The species includes: Occurred throughout all year seasons. Chlorella vulgaris, Aulacoseira granulata¤ Cyclotella menenghiniana¤ Achanthes minutissima¤ Cyclotella ocellata ¤ Diatoma vulgare ¤ Cymbella cistula ¤ Cocconeis pedicul¤ Fragilaria acus¤ Fragilaria ulna¤ Fragilaria ulna var biceps¤ Navicula cryptocephala , Nitzschia palea. The results showed that there was a peak of phytoplankton density in spring (67.8x 10ᴈ cell / L) while the lowest density recorded in summer (30.4 x 10ᴈ cell / L). The results appeared that there was a decline in phytoplankton density ranged between 2-3 times compared with the results in 2002 and 2003 in the same location. As conclusions, the density of phytoplankton affected by environmental factors throughout the seasons of year, besides the occurrence of Zebra mussel in the two stations.
Keywords
Euphrates River; Phytoplankton density; seasonal variation; Zebra mussel

Statistics Article View: 113 PDF Download: 92