research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
The Chronic Effects of Salinity in the Biology of ١؛ Rotifers Brachionus calyciflorus Pallas
التأثيرات المزنة للملوحة في حياتية الدولابي Brachionus calyciflorus Pallas

Authors: M.R. Nashaat مهند رمزي نشأت --- A.A. Al-Lami علي عبد الزهرة اللامي --- S.F. Bassa صباح فرج باصات
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2004 Volume: 1 Issue: 1 Pages: 32-37
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

The present study included the effect of chronic exposure for two concentrations of NaC؛ salt on the biology of fresh water zooplankton species Brachionus calyciflorus (from ^otifera). The concentrations 0.5 , 0.75%o were used for chronic exposure to investigate its effects on the life tables, range of the rate of expectation for further life and reproduction. The rotifer B. calyciflorus was sensitive to salinity and may tried to protect the species by increasing the size (2.22 ind./clutch lor control group and 2.9ة for 0.5%o concentration) and number of clutches produced ؟.1؛ clutch/female for control group and 2.9 ' ' ' for 0.75 %0 concentration) beside stimulation the animal to produce the first clutch of eggs earlier■ ٨ small reduction in mean longevity of the animal was noticed (8.1 day for control grou^ and7.١ day for 0.75 %0 concentration) while there was no effect on its average length and daily increasing during its life span

تضمن البحث الحالي دراسة تأثير التعرض المزمن لتركيزين ملحيين من محلول الطعام في حياتية نوع من الهائمات الحيوانية للمياه العذبة

Keywords


Article
DISTRIBUTION AND COMPOSITION OF ZOOPLANKTON IN EUPHRATES RIVER NEAR AL-MUS AIB POWER STATION
توزيع و تركيب الهائمات الحيوانية في نهر الفرات قرب محطة كهرباء المسيب وسط العراق 1.رتبة متفرعة اللوامس Cladocera

Loading...
Loading...
Abstract

Quantity and quality composition of Cladocera were studied throughout a period from July 2002 to March 2003. Three sites in Euphrates near Al-Mussaib power station were selected (S1, S2 and S3). The present study recorded 38 taxa of Cladocera, belonged to 15 genera , some of these were dominant as Alona , Ceriodaphnia and Daphnia. The species of Alona guttata, Chydorus gibbus and Scapholeberis kingi occurred at all sites throughout the study period . The highest mean values of bio-diversity (2.94) were recorded at S1 below the thermal effluent compared with other two sites. The present study showed variation in the composition of the community due to the effluent of Al-Mussaib power station in Euphrates river.

درس التركيب الكمي و النوعي لرتبة متفرعة اللوامس Cladocera للمدة من تموز 2002 ولغاية آذار 2003 في ثلاثة مواقع قبل المتدفقات الحارة لمحطة كهرباء المسيب المشيدة على نهر الفرات وسط العراق عندها وأسفلها (المواقع S1 وS2 وS3 على التوالي). تم تشخيص 38 نوعآ تعود الى 15 جنسآ ، لوحظ سيادة واضحة لأفراد كل من الأجناس Alona و Ceriodaphnia و Daphnia . كما تكرر تواجد افراد كل من الأنواع Alona guttata و Chydorus gibbusو Scapholebris kingi في جميع المواقع طوال مدة الدراسة.سجل في الموقع اسفل المتدفقات ( S3 ) اعلى المعدلات للتنوع الحياتي بقيمة 2.94 مقارنة بالموقعين الأخرين ، ودلت الدراسة الحالية على تباين مجتمع الأحياء ذاتها في المواقع الحالية بسبب تاثير المتدفقات الحارة لمحطة كهرباء المسيب.


Article
Spatial and temporal changes of the benthic invertebrate's composition in the North part of the main drainage channel.
التغيرات المكانية والزمانية لتركيب مجتمع لافقريات القاع في الجزء الشمالي من المصب العام.

Loading...
Loading...
Abstract

The effect spatial and temporal changes of benthic invertebrate's composition were studied in two selected sites, before and after north part of Main Drainage Channel meeting within drainage canals of Abu-Grabe, Al-Rhedwania and Al-Yosfiaa. Monthly samples were collected from September 2001 to August 2002. Water temperature ranged between 10 in January to 29.5 C in August. Salinity concentration and water turbidity recorded lowest mean values (3.4 gm/l and 8.8 NTU respectively) in the first site, whereas, highest values was (6.2 gm/l and 30.0 NTU respectively) in the second site. Dissolved Oxygen has been shown highest mean values reached 7.3 mg/l in the first site; while, the lowest was recorded in the second site reached 3.9 mg/l. The present study classified 33 species of benthic invertebrates, aquatic insect larvae, oligochaetes and molluscs formed 18, 11 and 6 species, respectively, as well as one genus only of crustacean. Three benthic invertebrate species were found to be dominate, namely Chironomous sp. (Chironomidae), Pristina aequiseta (Naididae) and Cypris sp. (Ostracoda). A total invertebrates density were recorded lowest values (4110.7 indi/m2) and highest ones (4906.6 indo/m2) in the first and second sites respectively. The highest values of total invertebrates density represented by oligochaetes and crustacean (3979.1 and 590.8 indi/m2 respectively) in the second site. A total biodiversity values in the Main Drain Channel reached 1.8 and 2.6 in the first and second sites respectively. The present study showed increasing in total density and biodiversity of benthic invertebrates in the second site of the north part of Main Drainage Channel after meeting within drainage canals of Abu- Grabe, Al-Rhedwania and Al-Yosfiaa.

Keywords

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

Arabic (3)


Year
From To Submit

2006 (1)

2005 (1)

2004 (1)