Item talk:Q237293

From geokb

{

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   "name": "Ecological tracers reveal resource convergence among prey fish species in a large lake ecosystem",
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   "abstract": "1. We measured stable isotopes of carbon (\u03b413C) and nitrogen (\u03b415N) and fatty acid profiles in Lake Ontario alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), slimy sculpin (Cottus cognatus) and round goby (Neogobius melanostomus) collected from 1982 to 2008 to investigate how temporal variability in these ecological tracers can relate to ecosystem-level changes associated with the establishment of highly invasive dreissenid mussels.\n2. Prey fish \u03b415N values remained relatively constant, with only slimy sculpin exhibiting a temporal increase in \u03b415N. In contrast, \u03b413C values for alewife, rainbow smelt and, especially, slimy sculpin became less negative over time and were consistent with the benthification of the Lake Ontario food web associated with dreissenids.\n3. Principal components analysis revealed higher contributions of 14:0 and 16:1n-7 fatty acids and increasingly negative \u03b413C values in older samples in agreement with the greater historical importance of pelagic production for alewife, rainbow smelt and slimy sculpin.\n4. Temporal declines in fatty acid unsaturation indices and \u03a3n-3/\u03a3n-6 ratios, and also increased 24:0/14:0 ratios for alewife, rainbow smelt and slimy sculpin, indicated the increasing importance of nearshore production pathways for more recently collected fish and resulted in values more similar to those for round goby.\n5. These results indicate a temporal convergence of the food niche, whereas food partitioning has historically supported the coexistence of prey fish species in Lake Ontario. This convergence is consistent with changes in food-web processes associated with the invasion of dreissenid mussels.",
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