Bibliographic Details
| Title: |
Potential effects of introduced salmonids on native lake trout Salvelinus namaycush in Lake Huron: evaluating niche overlap using stable isotopes. |
| Authors: |
Lasci, Jacob D.1 (AUTHOR) jlasci@uwo.ca, Hobson, Keith A.1 (AUTHOR), Neff, Bryan D.1 (AUTHOR) |
| Source: |
Canadian Journal of Fisheries & Aquatic Sciences. 2/20/2025, Vol. 82, p1-13. 13p. |
| Subject Terms: |
*LAKE trout, *FORAGE fishes, *CHINOOK salmon, *BROOK trout, *STABLE isotope analysis, *COHO salmon |
| Abstract: |
The Lake Huron fish community is comprised of many non-native species, including the piscivorous Pacific salmonids chinook salmon Oncorhynchus tshawtscha, coho salmon Oncorhynchus kisutch, and rainbow trout Oncorhynchus mykiss. The only abundant native piscivorous salmonid is the lake trout Salvelinus namaycush. Since 1980, there has been a steady decline in the biomass of the prey fishes these salmonids consume. Considering the collapse of alewife Alosa pseudoharengus in 2003, there has been growing concern that lake trout will be outcompeted by the non-native salmonids. Paramount to understanding this concern is determining the diet overlap between salmonids and how the overlap has shifted with changes in prey abundance. Here, stable isotope analyses (δ13C, δ15N) from lipid-extracted muscle tissues were compared among salmonids revealing large percentages of lake-wide isotopic niche overlap. Comparisons of these isotopes from salmonid scale samples taken before and after the alewife collapse revealed a shift in the diets of chinook salmon that now overlap with lake trout. Given the strong competitiveness of chinook salmon, this result is concerning for the management of the native lake trout. [ABSTRACT FROM AUTHOR] |
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