Wangberg, S. Botanical Institute, Goteborg University, +46 31 773 2626

 
SHORT-TERM OR LONG-TERM EXPERIMENTS FOR ECOLOGICAL RISK ASSESSMENTS IN AQUATIC ENVIRONMENTS
 
Wangberg, S.-A., Botanical Institute, Goteborg University, Box 641, SE-405 30 Goteborg, Sweden. SWA@fysbot.gu.se SHORT-TERM OR LONG-TERM EXPERIMENTS FOR ECOLOGICAL RISK ASSESSMENTS IN AQUATIC ENVIRONMENTS Disturbances from human activities on ecological systems is possible to measure on different scales. It can be on different organisation levels ranging from biochemical and sub-cellular levels to complete ecosystems and it can be on different time scales ranging from seconds to years. When making Ecological Risk Assessments we want to give accurate predictions on what will happen on the highest levels of these scales: Which are the long-term effects for the ecosystem ? We have, however, very limited possibilities to work on those levels but are forced to work on simplified systems and make extrapolations with the danger to make both under- and overestimation of the ecological risks. For micro-organisms toxicological test on cultures was, for a long time, the totally dominating method. With an increased awareness off how the culture condition and choice of species are influencing the results the more and more work are done with natural communities. This presentation will discuss advantages and disadvantages with the two major strategies when working with natural communities: Short-term experiments, measuring the effects on some physiological parameter and Long-term experiments measuring the effects on structural parameters. Examples will be taken from different types stress factors, including toxic compounds and ultraviolet radiation. SS11, SS51 Oral
 
Day: Friday, Feb. 5
Time: 11:30 - 11:45am
Location: Hilton of Santa Fe
 
Code: SS11FR1130H