Mortality and oxygen consumption of polychaete Hydroides elegans under hypoxic conditions
Research output: Conference Papers › RGC 33 - Other conference paper
Author(s)
Detail(s)
Original language | English |
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Publication status | Presented - 6 Jan 2011 |
Conference
Title | 6th Annual Symposium of the Center for Marine Environmental Research and Innovative Technology |
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Location | The University of Hong Kong |
Place | Hong Kong |
Period | 6 - 7 January 2011 |
Link(s)
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(450be73d-940a-4de9-947b-2eb24e7adbc1).html |
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Abstract
Mortality of Hydroides elegans was examined at 10 oxygen concentrations (0.14, 0.25, 0.35, 0.5, 0.75. 1.0, 1.5, 2.0, 4.0 and 6.3 mg O2 l-1) for 48 hours. No mortality was observed at 2.0 mg O2 l-1 or above. For oxygen concentrations < 2.0 mg O2 l-1 mortality increased as oxygen level was reduced. LC50 at 24 and 48 hrs were estimated at 0.32 and 0.45 mg O2 l-1, respectively.
Oxygen consumption rate was investigated at 2.0 and 6.3 mg O2 l-1 for five days. Individuals from the control group were exposed to 6.3 mg O2 l-1 throughout the experiment. For the hypoxic group, individuals were exposed to 6.3 mg O2 l-1 on the first day but the oxygen level was reduced to 2.0 mg O2 l-1 on Day 2 and Day 3. Oxygen level was then returned to normoxia on Day 4 and Day 5 to study recovery from hypoxic stress. Oxygen consumption remained constant throughout the experiment for the control group. For the hypoxic group, oxygen consumption was reduced by 40 – 50% when dissolved oxygen concentration was reduced on Day 2 and Day 3. When normoxic condition was resumed, oxygen consumption increased gradually but was still 20% lower than the control on Day 5. The present findings indicated that hypoxic stress reduced metabolic rate of H. elegans of which more than 2 days were required for complete recovery. As a filter feeder, slow recovery from hypoxia stress may reduce its competitiveness in a hypoxic environment.
Oxygen consumption rate was investigated at 2.0 and 6.3 mg O2 l-1 for five days. Individuals from the control group were exposed to 6.3 mg O2 l-1 throughout the experiment. For the hypoxic group, individuals were exposed to 6.3 mg O2 l-1 on the first day but the oxygen level was reduced to 2.0 mg O2 l-1 on Day 2 and Day 3. Oxygen level was then returned to normoxia on Day 4 and Day 5 to study recovery from hypoxic stress. Oxygen consumption remained constant throughout the experiment for the control group. For the hypoxic group, oxygen consumption was reduced by 40 – 50% when dissolved oxygen concentration was reduced on Day 2 and Day 3. When normoxic condition was resumed, oxygen consumption increased gradually but was still 20% lower than the control on Day 5. The present findings indicated that hypoxic stress reduced metabolic rate of H. elegans of which more than 2 days were required for complete recovery. As a filter feeder, slow recovery from hypoxia stress may reduce its competitiveness in a hypoxic environment.
Citation Format(s)
Mortality and oxygen consumption of polychaete Hydroides elegans under hypoxic conditions. / Cheung, S. G.; Shin, P. K. S.; Chiu, M. Y. et al.
2011. 6th Annual Symposium of the Center for Marine Environmental Research and Innovative Technology, Hong Kong.
2011. 6th Annual Symposium of the Center for Marine Environmental Research and Innovative Technology, Hong Kong.
Research output: Conference Papers › RGC 33 - Other conference paper