Journal
MARINE POLLUTION BULLETIN
Volume 63, Issue 5-12, Pages 230-236Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2011.03.014
Keywords
Gastropods; Hypoxia; Nassariid; Swimming activity; Respiration
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 1401/06 M]
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The effects of hypoxia on the larvae of two sub-tidal nassariid gastropods, Nassarius siquijorensis and N. conoidalis were compared so as to understand how the species-specific tolerance to hypoxia might have resulted in changes in the abundance and distribution of these two species in the hypoxic Tolo Harbour, Hong Kong, since the 1980s. Respiration rates of N. siquijorensis and N. conoidalis larvae were reduced at 4.5 mg O-2 l(-1), or below, as compared with the normoxic control. Significant reduction in swimming velocity was also observed for 10-day old larvae which were exposed to <2.0 mg O-2 l(-1) for N. siquijorensis and <1.0 mg O-2 l(-1) for N. conoidalis. The 48 h LC50 values of N. siquijorensis and N. conoidalis larvae were 0.7 and 1.7 mg O-2 l(-1), respectively. The results suggested that N. siquijorensis are more tolerant to hypoxia than N. conoidalis. (C) 2011 Elsevier Ltd. All rights reserved.
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