Mortality and oxygen consumption of polychaete Hydroides elegans under hypoxic conditions

Research output: Conference PapersRGC 33 - Other conference paper

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Author(s)

  • P. K. S. Shin
  • M. Y. Chiu
  • V. Thiyagarajan
  • J. W. Qiu
  • P. O. Jr. Ang

Detail(s)

Original languageEnglish
Publication statusPresented - 6 Jan 2011

Conference

Title6th Annual Symposium of the Center for Marine Environmental Research and Innovative Technology
LocationThe University of Hong Kong
PlaceHong Kong
Period6 - 7 January 2011

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.

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.

Research output: Conference PapersRGC 33 - Other conference paper