The Aquatic Macrophyte Community Index (AMCI) was used to define the quality of the aquatic plant community based on seven parameters: the maximum rooting depth, the percentage of the littoral zone vegetated, the relative frequencies of submerged species, sensitive species and exotic species, Simpson’s Diversity Index and the total number of taxa. Each parameter was scaled from with 10 representing the most desirable condition. The scaled values were then summed to obtain the AMCI (Nichols et al., 2000). The AMCI and FQI of Bass Lake were compared to those of all Wisconsin Lakes and Lake in the North Central Hardwood Forest region. Simpson’s Diversity Index (SDI) was used to measure the diversity of the plant communities in each survey. The formula measures the probability that two individuals from the same community will be the same species. Values for SDI range from 0-1 where a value of 0 indicates two individuals will always be the same species and a value of 1 indicates two individuals will always be different species. SDI = 1 - (Sum (frequency of occurrence of one species/sum frequency of all species)) Chi-square analysis was used to determine significant differences between consecutive surveys in the frequency of occurrence of each species. Figure 1. Map Sampling grid –
The Aquatic Macrophyte Community Index (AMCI) was used to define the quality of the aquatic plant community based on seven parameters: the maximum rooting depth, the percentage of the littoral zone vegetated, the relative frequencies of submerged species, sensitive species and exotic species, Simpson’s Diversity Index and the total number of taxa. Each parameter was scaled from with 10 representing the most desirable condition. The scaled values were then summed to obtain the AMCI (Nichols et al., 2000). The AMCI and FQI of Bass Lake were compared to those of all Wisconsin Lakes and Lake in the North Central Hardwood Forest region. Simpson’s Diversity Index (SDI) was used to measure the diversity of the plant communities in each survey. The formula measures the probability that two individuals from the same community will be the same species. Values for SDI range from 0-1 where a value of 0 indicates two individuals will always be the same species and a value of 1 indicates two individuals will always be different species. SDI = 1 - (Sum (frequency of occurrence of one species/sum frequency of all species)) Chi-square analysis was used to determine significant differences between consecutive surveys in the frequency of occurrence of each species. Figure 1. Map – Sampling grid
Bass_Lake_Aquatic_Plant_Survey_Report_2009-2015.docx