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Natural chemical markers identify source and date of introduction of an exotic species: lake trout (Salvelinus namaycush) in Yellowstone Lake
| Content Provider | Semantic Scholar |
|---|---|
| Author | Munro, Andrew R. McMahon, Thomas E. Ruzycki, James R. |
| Copyright Year | 2005 |
| Abstract | Exotic species invasions pose a pervasive threat to aquatic ecosystems worldwide, yet fundamental questions about the geographic origin and timing of invasions or introductions are frequently difficult to answer. We used natural chemical markers (Sr:Ca ratios) in otoliths to identify probable source and date of introduction of exotic lake trout (Salvelinus namaycush) into Yellowstone Lake, Wyoming, USA. Otolith Sr:Ca ratios were significantly different among lake trout known to have reared in three different Yellowstone National Park lakes (Yellowstone, Heart, and Lewis lakes) and showed little variation along the otolith axis, indicating that lake trout within each lake experienced a simi- lar, and consistent, environmental history. In contrast, suspected transplants showed a large and rapid increase in otolith Sr:Ca ratios indicative of a marked shift to water of differing chemistry. Timing of the abrupt change in Sr:Ca ratios indicated that some lake trout were introduced into Yellowstone Lake during the late 1980s, but more recent transplants also occurred. A discriminant model identified Lewis Lake as the likely source lake for lake trout transplanted into Yellowstone Lake. Our results demonstrate that chemical signatures within otoliths can serve as an important forensic tool for identifying the probable source and date of exotic fish introductions. Resume : Bien que l'invasion d'especes exotiques soit une menace omnipresente dans les ecosystemes aquatiques a l'echelle de la planete, les questions fondamentales concernant l'origine geographique et la date des invasions et des introductions restent souvent difficiles a resoudre. Nous avons utilise des marqueurs chimiques naturels (rapports Sr:Ca) dans les otolithes pour identifier la source probable et la date d'introduction des touladis (Salvelinus namaycush) exoti- ques du lac Yellowstone, Wyoming, E.-U. Les rapports Sr:Ca des touladis eleves dans trois lacs differents du parc na- tional de Yellowstone (Yellowstone, Heart et Lewis) sont significativement differents et ils affichent peu de variation le long de l'axe de l'otolithe, ce qui indique que les touladis de chacun des lacs y ont vecu une histoire environnementale semblable et uniforme. En revanche, les poissons soupconnes d'avoir ete transplantes montrent une augmentation rapide et importante des rapports Sr:Ca dans leurs otolithes, ce qui indique un passage subit dans une eau de caracteristiques chimiques differentes. La determination de la date de ces changements abrupts des rapports Sr:Ca indique que certains touladis ont ete introduits dans le lac Yellowstone a la fin des annees 1980, mais qu'i lyae uaussi des introductions plus recentes. Un modele discriminant identifie le lac Lewis comme la source probable des touladis introduits dans le lac Yellowstone. Nos resultats montrent que les signatures chimiques des otolithes peuvent etre des outils de recherche interessants pour identifier la source et la date probables d'introduction de poissons exotiques. |
| Starting Page | 79 |
| Ending Page | 87 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1139/f04-174 |
| Volume Number | 62 |
| Alternate Webpage(s) | http://pubs.nrc-cnrc.gc.ca/rp/rppdf/f04-174.pdf |
| Alternate Webpage(s) | http://www.montana.edu/mcmahon/documents/YNP-OM-cjfas.pdf |
| Alternate Webpage(s) | https://doi.org/10.1139/f04-174 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
