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The Effect of The Environmental Factors on the Seasonal Abundance of Tubifex tubifex (Oligochaeta: Annelida) In Some Branches of Shatt- Al-Arab (Al-Rubat, Al-Khandaq, and Al-Khourah canal) | ||
| basrah journal of science | ||
| Article 1, Volume 28, Issue 2, 2010, Pages 17-25 PDF (0 K) | ||
| Author | ||
| Manal M. Akbar | ||
| Abstract | ||
| The present study is interested in measuring the effect of enviro-nmental factors (temperature, DO, BOD, pH, Salinity, and Organic matter) on the abundance of T. tubifex in some branches of Shatt- Al-0Arab namely (Al-Rubat, Al-Khandaq, and Al-Khourah) collecting specimen has extended from October 2006 to September 207. Water temperature ranged between (12-38)˚C during February to September, DO ranged (3.2-4.7)mg/l through September to August respectively, and BOD showed high values which range between (2.5-6.5) mg/L during December to May. Salinity ranged between (3.5-5.2)ppt during April and October respectively, and pH have slight changes through study ranging between (6.7-8.4) during June to January. Finally the organic matter ranged between (91.4-99)% during October to august. The population density of T. tubifex has recorded values range between (529.2-144.2) Ind/m2 during September and March. The data showed that the worm can live in wide range of temperature, low level of Oxygen, high level of BOD and organic matter. The study also deals with the life cycle of the worm which reached about 120 days and the cycle include the following stages: the Cocoon, Immature stage, Mature Stage, and finally the ovigerous stage. | ||
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