Variations of sediment toxicity in a tidal estuary: a case study of the South Passage, Changjiang (Yangtze) Estuary.

摘要: highlights � The extracts of estuarine sediments induced multiple malformations in embryos. sediment toxicity was higher during the spring tide and flood tide. phenotypes malformation show obvious periodicities with tidal cycles. toxicities were impacted by grain fraction, resuspension. graphical a bstract abstract Sediments estuaries, especially those containing large reservoir contaminants released from urban industrial activities, have had great impacts on benthic fauna associated species. A better understanding is significance to ecological assessments. Here, based collected neap tides South Passage, Changjiang Estuary, first studied using frog embryo teratogenesis assay—Xenopus (FETAX). results showed that embryos two distinct patterns variations corresponding pattern dominated hypopigmentation edema heart, mainly controlled fine-grained fractions. second heart enlarged proctodeum, it mostly coarse-grain tides, which may be influenced size Furthermore, existed changes percentages hatching (14-16 h 6 h), proctodeum (15-18 bent tail (5-7 h) due influence Moreover, our also suggested FETAX an appropriate cost-effective biological monitoring tool assess health contaminated sediments.