Development of acute and chronic sediment bioassays with the harpacticoid copepod Quinquelaophonte sp

详细信息    查看全文

• 作者：Tristan J. Stringer ; Chris N. Glover ; Vaughan Keesing ; Grant L. Northcott ; Sally Gaw ; Louis A. Tremblay
• 关键词：Estuary ; Pollution ; Reproduction ; Toxicity ; New Zealand
• 刊名：Ecotoxicology and Environmental Safety
• 出版年：January, 2014
• 年：2014
• 卷：99
• 期：Complete
• 页码：82-91
• 全文大小：792 K

文摘

Reliable environmentally realistic bioassay methodologies are increasingly needed to assess the effects of environmental pollution. This study describes two estuarine sediment bioassays, one acute (96 h) and one chronic (14 d), with the New Zealand harpacticoid copepod <em>Quinquelaophonteem> sp. utilising behavioural and reproductive endpoints. Spiked sediments were used to expose <em>Quinquelaophonteem> sp. to three reference compounds representing important categories of estuarine chemical stressors: zinc (a metal), atrazine (a pesticide), and phenanthrene (a polycyclic aromatic hydrocarbon). Acute-to-chronic ratios (ACR) were used to further characterise species responses. Acute sediment (sandy and low total organic content) 96 h EC₅₀ values for the sublethal inhibition of mobility for zinc, atrazine and phenanthrene were 137, 5.4, and 2.6 碌g/g, respectively. The chronic EC₅₀ values for inhibition of reproduction (total offspring) were 54.5, 0.0083, and 0.067 碌g/g for zinc, atrazine, and phenanthrene, respectively. For phenanthrene, a potentially novel mode of action was identified on reproduction. <em>Quinquelaophonteem> sp. was found to be more sensitive than several other estuarine species indicating choice of test organism is important to characterising the effects of environmentally relevant levels of contamination. The bioassay sediment results demonstrate the sensitivity and suitability of <em>Quinquelaophonteem> sp. as a tool for the assessment use of estuarine health.