The data set on responses of aquatic invertebrates to hypoxia was created by extracting and digitizing data from published studies. The raw data were scaled to controls (i.e., high levels of oxygen).
Data were gathered from published, peer-reviewed studies, either copying if in tabular form or digitizing if they were plotted, using DataThief shareware which extracts data points from plots. Endpoints were measured in different ways and units, which were not immediately comparable across taxa and systems. We therefore normalized the extracted data by scaling measurements in different treatments to control, i.e. normoxic conditions.When controls were reported as averages with standard deviations, we used the value of the mean and one standard deviation for scaling. For studies testing impacts of oxygen and temperature, we scaled measured endpoints to normoxic conditions for each temperature treatment. If experiments reported results for different periods of time, we also scaled treatment results to control for each tested period.
Sponsorship: The work was funded by the University of Minnesota Twin Cities, College of Biological Sciences