Selection of methods for assessing sediment toxicity in California bays and estuaries.
نویسندگان
چکیده
Toxicity tests are often used in sediment assessment programs. However, the choice of methods has been largely limited to acute tests. Where sublethal methods have been used, there has been little consistency among programs in the types of the sublethal tests used. The goal of this study was to develop a method for choosing a suite of acute and sublethal tests for use in a California statewide assessment program, and to develop a set of method-specific thresholds for classifying the degree of toxicity within a multiple line of evidence framework consisting of sediment chemistry, benthic community structure, and sediment toxicity. A group of candidate methods was evaluated using feasibility and performance criteria. Toxicity thresholds were calculated based on test variability and sensitivity. As a result of the evaluation, 3 acute toxicity methods using amphipods (Eohaustorius estuarius, Rhepoxynius abronius, and Leptocheirus plumulosus), and 2 sublethal methods using a polychaete and mussel embryos (Neanthes arenaceodentata growth and Mytilus galloprovincialis embryo development at the sediment-water interface) were selected for recommendation. Thresholds for toxicity categories corresponding to Nontoxic, Low Toxicity, Moderate Toxicity, and High Toxicity were developed for each test method. Although these toxicity categories and thresholds provide a consistent framework for the interpretation of test results among different methods, additional research is needed to determine their effectiveness for predicting impacts to benthic communities.
منابع مشابه
MEMORANDUM To : Exposure and Effects Workgroup
The 2008 RMP Status and Trends program (RMP S&T) will be collecting benthos, sediment toxicity and chemistry at 27 stations this summer in order to implement and evaluate the Sediment Quality Objectives (SQOs) assessment methods for bays and estuaries that have been approved by the State of California. The RMP S&T conducts both acute and sub-lethal sediment toxicity tests as recommended by the ...
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ورودعنوان ژورنال:
- Integrated environmental assessment and management
دوره 8 4 شماره
صفحات -
تاریخ انتشار 2012