Fig. 4From: Toxicity and risk of plant-produced alkaloids to Daphnia magnaMeasured alkaloid concentrations in soil-, drain- and surface waters monitored in Denmark and Switzerland at different times during the year from January (month 1) to December (month 12) [23, 24]. The acute and chronic EQS values for the summed alkaloid concentrations are given by a full and broken line, respectivelyBack to article page