The larvae of congeneric gastropods showed differential responses to the combined effects of ocean acidification, temperature and salinity.
The tolerance and physiological responses of the larvae of two congeneric gastropods, the intertidal Nassarius festivus and subtidal Nassarius conoidalis, to the combined effects of ocean acidification (pCO2 at 380, 950, 1250 ppm), temperature (15, 30°C) and salinity (10, 30 psu) were compared. Results of three-way ANOVA on cumulative mortality after 72-h exposure showed significant interactive effects in which mortality increased with pCO2 and temperature, but reduced at higher salinity for both species, with higher mortality being obtained for N. conoidalis. Similarly, respiration rate of the larvae increased with temperature and pCO2 level for both species, with a larger percentage increase for N. conoidalis. Larval swimming speed increased with temperature and salinity for both species whereas higher pCO2 reduced swimming speed in N. conoidalis but not N. festivus. The present findings indicated that subtidal congeneric species are more sensitive than their intertidal counterparts to the combined effects of these stressors.
Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China.
Haoyu
H
Zhang
Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China; State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong, China.
S G
SG
Cheung
Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China; State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong, China. Electronic address: bhpshin@cityu.edu.hk.
Paul K S
PK
Shin
D000818:Animals; D002245:Carbon Dioxide / Q000633:toxicity*; D049851:Gastropoda / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D007814:Larva / Q000502:physiology; D018570:Risk Assessment; D054712:Salinity; D012623:Seawater / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide
Larvae; Mortality; Nassarius; Ocean acidification; Respiration; Swimming behavior