수온과 용존산소 변화에 따른 미더덕 Styela clava의 생존율 및 생리적 반응
Effect of Temperature and Dissolved Oxygen on the Survival Rate and Physiological Response of the Warty Sea Squirt Styela clava
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Decrease in dissolved oxygen concentrations associated with temperature fluctuation isan important criteria to evaluate the mortality rate of the species. Based on this parameter, weinvestigated the survival rate, physiological response and histological change of warty sea squirt. It was found that the survival rate of the warty sea squirt species was 63.3% at 23°C and 56.6%at 26°C respectively. However, exposure of six days at 29°C caused deaths among species, whichindicated the 6day-LT50 of the tested species to be 24.58°C(19.48~35.48°C). Further, after 11 dayof exposure, the dissolved oxygen concentration has been found to decrease, with the survival rateof 20% at 4.0 mg L-1 and deaths at 2.0 mg L-1, thus 11day-LC50 calculated to be 3.88 mg L-1(3.29~4.57 mg L-1). In addition, decrease in rate of oxygen consumption and excretion of ammoniawas also noted at this critical water temperature and dissolve doxygen concentration. Moreover,there has been common histopathological changes were observed in warty sea squirt’s gillpouch, digestive tract, and tunic as follows such as: proliferation of epithelial cells, condensationand necrosis, permeation of phagocyte and blood cell, loss of cilium and muscular fiber degeneration. Based on our study results, we suggest that these parameters can also be useful to evaluatethe survival rate and physiological response in other species.
Abstract
Decrease in dissolved oxygen concentrations associated with temperature fluctuation isan important criteria to evaluate the mortality rate of the species. Based on this parameter, weinvestigated the survival rate, physiological response and histological change of warty sea squirt. It was found that the survival rate of the warty sea squirt species was 63.3% at 23°C and 56.6%at 26°C respectively. However, exposure of six days at 29°C caused deaths among species, whichindicated the 6day-LT50 of the tested species to be 24.58°C(19.48~35.48°C). Further, after 11 dayof exposure, the dissolved oxygen concentration has been found to decrease, with the survival rateof 20% at 4.0 mg L-1 and deaths at 2.0 mg L-1, thus 11day-LC50 calculated to be 3.88 mg L-1(3.29~4.57 mg L-1). In addition, decrease in rate of oxygen consumption and excretion of ammoniawas also noted at this critical water temperature and dissolve doxygen concentration. Moreover,there has been common histopathological changes were observed in warty sea squirt’s gillpouch, digestive tract, and tunic as follows such as: proliferation of epithelial cells, condensationand necrosis, permeation of phagocyte and blood cell, loss of cilium and muscular fiber degeneration. Based on our study results, we suggest that these parameters can also be useful to evaluatethe survival rate and physiological response in other species.
참고문헌 (21)
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