Characterizing the genetic structure of endangered Lake Chubsucker populations for conservation

Session: Imperiled Species in the Great Lakes Basin: Identifying Threats and Restoring Populations (3)

Ryland Corchis-Scott, The University of Windsor, [email protected]
Trevor Pitcher, University of Windsor (GLIER), [email protected]
Nicholas Mandrak, Biological Sciences, University of Toronto Scarborough, [email protected]

Abstract

Freshwater fishes are thought to be in decline around the world due to human activities. Reversing the decline of at-risk freshwater fish may involve reintroduction (releasing a species back into an area where it was once native). Reintroductions have proven to be challenging with historically low success rates. Considering population genetics when selecting source populations for reintroduction is hypothesized to increase reintroduction success. Source population selection strategies include choosing populations to either maximize genetic diversity or genetic similarity. Both strategies require the characterization of genetic structure of existing populations. Lake Chubsucker (Erimyzon sucetta) is a freshwater fish, endangered in Canada, with a broad but fragmented North American distribution. Population genetics have not been studied in this species, so conservationists are unable to take concrete action towards their recovery through reintroductions. The objective of this research project is to characterize the genetic structure of Lake Chubsucker populations across its North American range. Understanding the genetic patterns within and among Lake Chubsucker populations will allow the selection of source populations for reintroduction or the establishment of captive a breeding program. This research will inform reintroduction efforts and add to current knowledge of the genetic challenges in reintroduction.