Maps showing hot spots of adult (left) and juvenile (right) mussels

Example of hot-spot maps of adult (left) and juvenile (right) mussels in Navigation Pool 5 of the Upper Mississippi River.  The size of the dots represent the number of mussels per square meter of the river bottom—with larger dots representing more dense mussel assemblages.  Hot spots (red) indicate where sites of high mussel density were surrounded by sites of high mussel density.  Cold spots (blue) are where sites of low density were surrounded by sites with low density.  There are also sites of high density surrounded by low density (HL, orange) and sites of low density surrounded by high density (LH, green).