Document Details

Document Type : Thesis 
Document Title :
The Effect of Thermal Acclimation and Heat Shock Response on Thermal Tolerance of Blue Crabs Portunus pelagicus (L.)
تأثير الأقلمه الحراريه و استجابة الصدمه الحراريه على التحمل الحراري للسرطان الأزرق (Portunus pelagicus (L
 
Subject : biological sciences department 
Document Language : Arabic 
Abstract : The effect of thermal acclimation and acclimatization in the ectothermal crab Portunus pelagicus (blue crab) has been studied to determine the thermal tolerance to high temperature (Critical Thermal maximum, CTMax) and low temperature (minimum, CTMin). In addition a separate series of experiments were carried out to determine thermotolerance to high temperature (CTMax) and its dependence on prior heat shock. The results indicated that the warm acclimation increases thermotolerance compared with cold acclimation in Portunus pelagicus through different thermal acclimation (20, 25, and 30oC). Acclimation had a significant effect, with 30oC acclimated crabs having significantly higher CTMax and CTMin than 25 or 20oC acclimated crabs, as would be predicted. The results also showed that there was a marked seasonal effect on CTMax in Portunus pelagicus. The CTMax of winter caught crabs was significantly lower than in summer caught animals, a difference that persisted irrespective of laboratory acclimation status.The experiments also indicated that the CTMax of winter caught crabs was significantly higher than in 25oC acclimated crabs with small differences. Whereas, the CTMax of summer caught crabs was no significant differences with 30oC acclimated crabs. This may be due to the acclimatization temperature of decapods usually changed slowly in natural environment, which was largely slower than the rate of temperature increment in the laboratory. Furthermore it was observed that heat shock resulted in a significant decrease in CTMax of Portunus pelagicus, but a different pattern was found in each group of different acclimation temperatures (20, 25 or 30oC). These results were unexpected; suggest that a possible explanation for this discrepancy might be the degree of heat shock was too high. Finally, the mortality percentage after Heat Shock Proteins HS was higher in 30 oC acclimated crabs comparing with 25 or 20 oC. These suggested that mortality increased with raised water temperature due to the acute thermal stress. 
Supervisor : Dr. Suhaila Abdul-Fattah Qari 
Thesis Type : Master Thesis 
Publishing Year : 1434 AH
2013 AD 
Added Date : Wednesday, May 1, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
رباب محمد الجراريAljarari, Rabab MohamedResearcherMaster 

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