Table 2.

Results of a short-term trend analysis using satellite imagery at five drinking water sources that exhibited a sustained trend (γ ≤ 4 years) based on monthly observations spanning June 2016 through April 2020; effect size is expressed in years. A negative change indicates a decrease in cyanobacterial frequency over the time period considered.

Lake	Sample size	Kendall’s tau	Percent change per year	Effect size (γ)
Morgan Lake, NM	47	0.4	60%	3
Lake Overholser, OK	47	− 0.7	− 30%	1
Grand Lake, OH	40	− 0.7	− 10%	3
Choke Canyon Reservoir, TX	47	− 0.4	− 20%	3
Lake Eufaula, OK	47	− 0.5	− 20%	3