Synopsis
Threespine stickleback, Gasterosteus aculeatus, are thought to have been introduced into Hasse Lake, Alberta, where they were discovered in 1980. The population has grown in numbers since 1980 and by 1981 was more abundant than the native brook stickleback, Culaea inconstans. This population is the first to be found in the interior plains of North America, and it occurs at a higher elevation than any other Canadian population. The source of this introduced population is unknown. Significant differences among four years were found in several meristic and morphometric characters but no significant trends during 1980–1983 were found. Most characters were well within the range of other populations of the species.
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Nelson, J.S., Harris, M.A. Morphological characteristics of an introduced threespine stickleback, Gasterosteus aculeatus, from Hasse Lake, Alberta: a first occurrence in the interior plains of North America. Environ Biol Fish 18, 173–181 (1987). https://doi.org/10.1007/BF00000357
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DOI: https://doi.org/10.1007/BF00000357