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دراسات تصنيفية وحياتية ووبائية للمثقوبات المتطفلة في الجهاز التنفسي للطيور المائية في اهوار محافظة ذي قار == Taxonomic,Biological and Epidemiological Studies of Trematodes Parasitic in the Respiratory System of Some Aquatic Birds in Marshes of Thi - Qar province/Iraq
Author name:
نثيلة رشيد حميد الكسار
Supervisor name:
صبيح هليل المياح | باسم هاشم عبد الله
General topic:
Biology
Specific topic:
Microbiology - Parasites
Degree:
Doctorate
University:
University Of Basrah - College Of Education For Pure Sciences
Language:
Arabic
University location:
Basrah
First pages:
24T3575 - p.pdf
Abstract:
A total of 420 aquatic birds belonging to four species( Chettusia leucura , Himantopus himantopus, Gallinula chloropus and Fulica atrawere collected in the current study during the period between December 2012 to November 2013 fisolated from Al - Chibayish marshes , eastern of Thi Qar province. Digenetic trematode, Haematotrephus nittanyense was isolated from H. himantopus and C. leucura. Prevalence in those birds were 20.7% , 2.2% respectively. Mean intensity of infection 1.7 , 1.2 respectively. Digenetic trematode , Haematotrephus chengi was found in C.leucura, the Prevalence of infection was 20.7% . These two trematodes were recorded for the first time in Iraqi birds . 2.6% of Ch. leucura were infected with Digenetic trematode , Uvitellina iraquensi , mean intensity of infection was 2.7 . Digenetic trematode , Cyclocoelum mutabile Cyclocoelum mutabile was isolated from F. atra and G. chloropus birds . Prevalence in those birds were 21.2% ,10% respectively. Mean intensity of infection 3 , 3 . Digenetic trematode , Cyclocoelum microstomum was found in 20% of G. chloropus birds and in 15% of F. atra , mean intensity of infection 2.8 , 1.8 respectively.The current study revealed that , most eggs of H. nittanyense , H. chengi and U. iraquensis hatch within the uteri of worms while embryonated eggs of C. mutabile and C. microstomum shed from mature worms hatch within few hours after being placed in water. The mean number of eggs differed between species. Hatching of C. mutabile and C. microstomum eggs did not occur at 12°C . Egg hatching rate of C. mutabile differed from eggs hatching rate of C. microstomum at all temperatures . Temperatures, salinity and acidification of water affectedthe rate of hatching of C. mutabile and C. microstomum eggs , and the results varied between two different species . Storing eggs of C. mutabile and C. microstomum at (0,4)°C for ( 1 - 8) weeks failed to hatch . Storing eggs of C. mutabile and C. microstomum at (7,10,12)°C for (1 - 8) weeks had no effect on hatching success or on eggs hatching rate.A biological study of the miracidia of trematodes which were isolated in the current study showed that , the survivorship and longevity of miracidia were differed among the different species . Temperature, salinity and acidification of water affected the survivorship and longevity of miracidia . Storing eggs of all species at (7,10,12)°C for eight weeks had no effect on survivorship and longevity of their miracidia. The study revealed that , the miracidia of all species were infective to Radix auricularia and Physa acuta snails , but R. auricularia snails more sensitive to infection . The infectivity of the miracidia of all species to R. auricularia and P. acuta snails varied according to the species of these trematodes . Infection rate of R. auricularia snails with the miracidia of all species , mean intensity of infection and the metacercariae output varied according to species of these trematodes, temperature , miracidial density as well as size of snails. Miracidia hatching from eggs stored for 1 - 8 weeks at 7°C not differed in their infectivity to snail. The miracidia of all species hatching from eggs stored for (0 - 8) weeks at 7°C differed in their infectivity to snail according to the species of these trematodes. Age and density of H. chengi miracidia affected the infection rate of R. auricularia snails as well as affected the mean intensity of infection . H. chengi infection had no effect on mortality rate of R. auricularia and P. acuta snails.The results showed that there were differences between the various stages included in the life cycle of the five species of Cyclocoelidae family isolated in the current study . The time required for production and development of these stages varied according to their species, as well as these larval stages were differed among the species in their shapes , sizes and in the product number of them .The current study revealed that , metacercariae of the trematodes which were isolated in the current study fed separately to Gallus domesticus and Anas platyrhynchos failed to produce an infection , although the influence of C. leucura bile on metacercariae of H. nittanyense , H. chengi and U. iraquensis varied according to the species of these trematodes but bile of C. leucura plays a role in increasing excysted juveniles ratios , reduction the time required for excysting and increasing the time of juveniles activity compared with a bile of G. domesticus .In the current study. H. nittanyense showed a clear seasonal cycle of infection in local aquatic birds , H. himantopus ,while the study exposed a clear seasonal cycle of H. chengi infection in local aquatic birds C. leucura . Isolation of U. iraquensis in different periods during the current study from local aquatic birds, C. leucura may refer to its ability to complete its life cycle in a study area. Isolation of C. mutabile from migratory bird at arrival time to the study area may refer to new infections that carried by these migratory birds from their breeding grounds . Abundance of sensitive snails and suitable temperatures in a study area at arrival time of these birds may help this trematode to complete its life cycle in this area thus new infections emerged later and these infections may carry by microstomum isolated from migratory birds only at the arrival time to the study area may refer to new infections that carried by these migratory birds from their breeding grounds as well as this may indicate an inability to complete the life cycle of this trematode in this area.
