دراسة بيئية وسكانية للقوقع الارضي Candidula gigaxii (L.Pfeiffer, 1850) (Pulmonata : Hygromiidae) في مواقع مختارة من محافظة بغداد == Ecological And Population Study of The Land Snail Candidula Gigaxii (L.Pfeiffer, 1850) (Pulmonata : Hygromiidae) In Selected Locations From Baghdad Province
Author name:
بشرى محمد كاظم ديوان البيضاني
Supervisor name:
عماد الدين عبد الهادي المختار
General topic:
Biology
Specific topic:
Zoology
Degree:
Master
University:
University of Baghdad - Ibn Al-Haytham College Of Education For Pure Sciences - Department Of Biology
Language:
Arabic
University location:
Baghdad
First pages:
24T3014 - p.pdf
Abstract:
Few studies on terrestrial snails in general, and garden snails in particular, existin Iraq. The group being important apparently for its wide - spread distribution in various habitats. One species of this group which has been previously recorded in Baghdad, is the garden snail Candidula gigaxii, class : Pulmonata, family : Hygromiidae.Available samples of the land snail C.gigaxii were collected from four locations within Baghdad province; a Taji, the Army Canal area, the Zafaraniyah, and Al - Jadiriya district, the study period of June 2013 to May of 2014.Environmental measurements were recordedat each site. Results showed that air temperature range was 10 - 34? C, soil temperature range was 5 - 26? C, pH range of the soil was between 4 - 8.9 and the content of the soil organic matter was between 0.3 - 2.0%.Snail samples were divided into seven size - classes according to the dimension of the shell and these were <2, 2 - 4, 4 - 6, 6 - 8, 8 - 10, 10 - 12, >12 mmPercentages of each size class were calculated. Having measured shell dimensions, shell growth index (Ia) was also calculated. The range of growth index value for this snail was 1.9 - 3.86 where the highest value was recorded at the Taji site in January 2014 which was probably attributed to low temperature range and high soil moisture and organic matter content.Results also showed that C. gigaxii favored soils with moderately high pH values and rich in organic content. Soil moisture appeared to be a limiting factor for growth; and a loamy soil texture for existence of the studied species. Average highest population density of living snails and empty shells were 44 and 32 individuals / m2 respectively. The overall population density was also calculated for the purpose of obtaining realistic population density of the species.
