Ecological Risk Screening Summary - Lyngbya (Microseira wollei) - High Risk

Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.

Microseira wollei, Lyngbya, is an algal species that is native to Australia, Asia, and Africa. It is a blue-green alga that grows in the benthos of freshwater rivers and lakes. It is known to produce toxins that may be harmful to crops, livestock, and humans. The History of Invasiveness for Microseira wollei is classified as High. This species has been introduced and has become established outside of its native range, including within the United States, and there was information available regarding negative impacts of introductions. In addition to the toxin produced by Microseira wollei, mats of algae can impede water resource uses, smother submersed plants, and reduce aesthetic value of water bodies through its appearance and odor. The climate matching analysis for the contiguous United States indicates establishment concern for this species. Areas with high match were found in the Northeast, northern Midwest, Southeast, Great Lakes region, and peninsular Florida. The Certainty of Assessment is classified as Medium due to large gaps in representation of the native range in the climate matching analysis. The Overall Risk Assessment Category for Microseira wollei is High.