How did Rainbow Smelt invade the Great Lakes? - Testing Bergstedt’s 1983 multiple introduction hypothesis and it’s potential role in rapid adaptation

Material Information

Title:
How did Rainbow Smelt invade the Great Lakes? - Testing Bergstedt’s 1983 multiple introduction hypothesis and it’s potential role in rapid adaptation

Notes

Abstract:
Some invasive species rapidly adapt to novel environments despite the associated founder effects during the initial colonization phase. Such adaptation is possible if sufficient genetic variation is generated (e.g., via multiple introductions). In the Great Lakes, Rainbow Smelt (Osmerus mordax) originally invaded Lake Michigan following unintended migration from a stocked population in Crystal Lake. The remaining Great Lakes were subsequently colonized in a relatively sequential order; however, Lake Ontario may have been established by an anadromous strain originally stocked into the Finger Lakes. This invasion provides a natural experiment to test if multiple introductions occurred and if so, to investigate the potential evolution of different ecotypes. Here, we genotyped Rainbow Smelt from Lake Superior (n=18), Lake Michigan (n=24), Lake Huron (n=21), Lake Erie (n=24), and Lake Ontario (n=43) at 13,486 loci. Preliminary results suggest that both Lake Erie and Lake Ontario were from a second, independent introduction given that pairwise Fst estimates to the three remaining Great Lakes ranged 0.05 to 0.06. Future work will focus on identifying outlier loci to better characterize hybridization between the two introductions.
Acquisition:
Collected for SUNY Oswego Institutional Repository by the online self-submittal tool. Submitted by Nicholas Sard.

Record Information

Source Institution:
SUNY Oswego Institutional Repository
Holding Location:
SUNY Oswego Institution
Rights Management:
All applicable rights reserved by the source institution and holding location.