Author name:
ميسون حسن مشجل السراي
Supervisor name:
هيفاء جواد جوير
Abstract:
استهدفت الدراسة الحالية التنوع الاحيائي لمجتمع لافقريات القاع في هور الدلمج / وسط العراق فضلا عن بعض الخصائص الفيزياوية والكيمياوية لمياه الهور، اختيرت ست محطات لجمع العينات وذلك للمدة من بداية كانون الثاني وحتى كانون الاول 2013. استخدم تحليل التوافق CCA | Benthic invertebrate diversity on the Al - Dalmage marsh in the middle of Iraq, in addition to the some physical and chemical properties was the goal of the present study, for a period from January to the end of December 2013. Six stations along the eastern side of the marsh were chosen for monthly samples collection.The results showed water temperature ranged from(9 - 34.1)?C. The pH values were neutral but tends to near alkaline and ranged from (7.2 - 9).The Electrical conductivity values varied from (22735 - 2330) ?s/cm, according to the values of salinity (1.5 - 14.6) ‰ the marsh was classified as mesohaline (TDS) which showed high values ranged from (1820 - 17762) mg/L.This study showed that the marsh were well oxygenated due to the dissolved oxygen values which ranged from 7 - 12 mg/L, the study recorded values to BOD5 were ranging from (1.5 - 3)mg/L, and the marsh classified as very hard according to the total hardness values from (6980 - 825) CaCo3 mg/L. The high perecentage of organic matter in the sediment was 2.7 %. The results showed the station were characterized by sediment texture varied from silt clay sand sediment in the stations 1, 4, 5 , silt clay in St(2) and sand silt in St(3), sand clay silt in St(6).A total of 21286 individual benthic invertebrates was sorted, which represents which 78 taxonomic units, including 9 taxa. The Crustacea was the dominate group representing 29% of the total number of benthic invertebrates. It was noted that there were obvious differences in the total number of sorted individuals in which varied in each location and each month. The highest total number recorded in was st (2) was 4360 including 73 taxonomic units, while the highest total number recorded in April was 2624.The results of The relative abundance index showed that the species insects : Polypedilum sp Were more abundant in St(2 - 6), and dominant in St(6), while the Seinura sp were dominant in St(6), while the other taxonomy units varied from less abundant to rare abundant. Also the results of constancy index showed The which were considered "constant " However the other taxonomy units varied from "accessory " and" accidental" taxonomy units in study stations.The Shanon - Weiner index of totall benthic invertebrates varied from (1.2 - 3.8) bit/Ind, The uniformity index of benthic invertebrates varied from(0.7 - 1), these high values indicate that there is no ecological stress on benthic invertebrates in the study area.The Results of Jaccard Presence - community of similarity showed the highest degree of similarity to be 96% which recorded between St(1) and St(2).The values of the index of spcies richness varied from 1.3 - 15 with the greatest values recorded in April while lower values were in October.Six species of Turbellarian Platyhelminthes that were recorded, from which Stenostomum leucops, Stenostomum bryophilum, Stenostomum unicolor, Gyratrix hermaphrodites, Macrostomum sp, Dalyelliidae, which were considered as new records for Iraq, with Gyratrix hermaphrodites as the most abundant species and representing 25% of the total number of Turbellarian. It was noted that there were obvious differences in the total number of sorted individuals which varied in each location and each month, the highest total number recorded in St 3 was 400, while the highest total number recorded in November was (198).The present study result showed that three species of Nematoda were recorded incuding Seinura sp, Alaimus sp, Dorylaimus sp, Seinura sp as the most abundent species representing 84% of the total number of Nematoda. Spatially the highest total number of 590 individuals was recorded in St (4) , while temporally, the highest total number of 366 was recorded in October.One unidentified species of Gastrotricha was recorded for the first time in Iraq, 102 Ind were sorted these were considered "constant" recording to constancy index 63.8% which were sorted from all stations.A total of 2319 individuals of Rotifera was sorted, these were identified as 15 species that included Philodina sp, Rotaria citrinus, Dipleuchlanis sp, Euchlanis sp, Notholca sp, Ttriploeuchlainis sp, Colurella sp, Lepadella sp, Lecane sp, Proales sp, Cephalodela sp, Synchaeta sp, Hexarthra mira, and finally Brachionus sp which was recorded the highest number of individuals 540 individuals.A total of 1888 individual Annelida were sorted representing 12 species including nine species belonging to the family Naididae (three belong to the sub family Naidinae and six belonging to Tubificoid worms), two species belonged to Aleosomatidae including Aeolosoma hemprichi, Aeolosoma variegatum, and finaly one specie belong to Hirudinea which was Glossiphonia heteroclite, with three 3 ind in all study.The family Aleosomatidae recorded the highest percentage of 58% of the total number of Annelida.The sub family Naidinae including Paranais litoralis, Dero (Aulophorus) furcata, Stylaria lactustris.The highest frequency of 23.6% was recorded by P. litoralis.The Tubificoid worms represent six species which were Limnodrlius hoffmeisteri, Limnodrlius profundicola, L. claparedeianus, L udekemianus, Tubifex tubifex, Branchiura sowerbyi. This study also isolated 6238 individual Crustacea, these were identified as 15 species that included five species belonged to Cladocera, four order belong to copepod, which were recorded the highest percentage 30% of the total number of Crustacea, in addition to Macrobrachium nipponense from Decapoda, Sphaeroma annadalei anndalei from Isopoda, Ostracoda, Amphipoda, Conchostracha. It was noted that there was obvious differences in the total number of sorted individuals which varied in each location and each month, The highest total number recorded in st (2) was 1480, while the highest total number of 730 was recorded in April. The study finds 4297 individual insects groups, were sorted represent seven order includes larvae of Ephemeroptera, Trichoptera, Odonata, (Zygoptera, Anisoptera) Diptera (Culicidae, Chironomus sp, Polypedilum sp) Lepidoptera larvae Hemiptera (Corixidae, Nepa cinerea), and adult of Coleoptera (Dysitidae, Hydrophilidae Elmidae, Curculionidae, Coleoptera larvae), the Diptera larvae were recorded the highest percentage 55 % of the total number of insects groups, and Nepa cinerea was considered as new records for Iraq.This study showed two class from Mollusca, 1956 Ind were sorted, including Gastropoda and Pelecyopoda.The Gastropoda which were recorded the highest percentage 94% of the total number of Mollusca, these were identified to physa acuta, Lymnaea sp, Melonoides tuberculata, Melnopsis nodosa, Theodoxus sp, physa acuta which was the greatest percentage 41% of the total number of gastropoda. pelecyopoda which were including Pseudodontopsis euphraticus, Tigridis Unio, Corbicula fluminea, Corbicula fluminali
