Invasive Species are Reshaping Aquatic Ecosystems, One Lake at a Time

Abstract

Publication: The Conversation

​Invasive species are rapidly altering freshwater ecosystems worldwide, with Canadian lakes experiencing significant impacts. Notable invasions include zebra mussels in Québec and Manitoba, Chinese mystery snails in eastern Canada, Eurasian watermilfoil in the Maritimes, and proliferating goldfish in various water bodies. These species often spread through human activities such as ballast water discharge, canal construction, fish stocking, improper bait disposal, recreational boating, and pet releases.

For instance, zebra mussels can survive out of water for days, facilitating their overland transport via boat trailers. The consequences of these invasions are profound: zebra mussels filter water, increasing clarity and promoting excessive aquatic plant growth, disrupting native species and ecosystem functions. Chinese mystery snails can outcompete indigenous mollusks, while Eurasian watermilfoil forms dense mats that hinder recreational activities and alter habitats. Addressing these challenges requires stringent biosecurity measures, public awareness, and coordinated management strategies to prevent further introductions and mitigate existing infestations.