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de Algal blooms can have negative effects on an ecosystem by dominating its phytoplankton communities Gonyostomum semen is a nuisance alga infesting many parts of northern Europe Could the overall biomass of G semen be controlled by grazing zooplankton species A research team examined the relationship between the net growth rate of G semen and the number of Daphnia magna grazers introduced in test tubes A net growth rate was computed by comparing the initial and final abundances of G semen in the experiment with a negative value indicating a decrease in abundance Here are the findings ZEL N be of gr az S N et 0 wt h ra te 1 2 3 4 5 6 1 9 2 5 2 2 3 9 4 1 4 3 To access the complete data set click the link for your preferred software format Excel Minitab14 18 Minitab18 JMP SPSS TI R Mac TXT PC TXT CSV CrunchIt 1 From graphs in K Lebret et al Grazing resisitance allows bloom ormation and may explain invasion success of Gonyostomum semen Limnology and Oceanography 57 2012 pp 727 734 Hoi 10 4319 lo 2012 57 3 0727 Macmillan Learning Make a scatterplot of number of grazers and net growth rate Do you think that D magna is an effective grazer of the G semen alga The nonlinear relationship indicates that D magna is not an effective grazer of the G semen alga The positive linear relationship indicates that D magna is not an effective grazer of the G semen alga The negative linear relationship indicates that D magna is an effective grazer of the G semen alga The negative linear relationship indicates that D magna is not an effective grazer of the G semen alga The positive linear relationship indicates that D magna is an effective grazer of the G semen alga

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