Effects of low dissolved oxygen on survival and asexual reproduction of scyphozoan polyps (Chrysaora quinquecirrha)

摘要: Hypoxic conditions are common in many coastal environments such as Chesapeake Bay. While medusae appear to be quite tolerant of low dissolved oxygen (DO) concentrations, the effects hypoxia on benthic polyp stages unknown. Chrysaora quinquecirrha (DeSor) polyps, and were subjected 5 DO treatments (air-saturated [control], 3.5, 2.5, 1.5 0.5 mg 1-1) laboratory. Polyp survival development documented over 24 d. Virtually no mortality occurred any treatment during first Total after d was 59.3% at lowest concentration, whereas <3% observed air-saturated treatment. Formation stolons strobilae all treatments, however, proportions polyps undergoing stolonation strobilation significantly greater concentrations above 1-1. encystment not course experiment. These results indicate that can survive asexually propagate even prolonged exposure hypoxic conditions.