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Are salmon-derived nutrients being incorporated in food webs of invaded streams? Evidence from southern Chile

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https://ir.library.oregonstate.edu/concern/articles/bk128g94f

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  • Using stable isotope analyses of N and C we present preliminary evidence of marine-derived nutrients from introduced Chinook salmon (Oncorhynchus tshawytscha Walbaum) in stream food webs of Laguna Los Patos, NW Patagonia. Similar to values reported within Chinook salmon's native distributional range periphyton and aquatic insects are the trophic levels that show the greatest enrichment of δ15N (5–6‰). Since there is a rapid expansion of Chinook salmon in South America future effort is needed to elucidate the mechanisms and consequences of nutrients subsidies from salmon carcasses in those invaded ecosystems.
  • En utilisant l’analyse des isotopes stables de N et C, nous présentons des données préliminaires indiquant que les éléments nutritifs provenant du saumon Chinook introduit (Oncorhynchus tshawytscha Walbaum) entrent dans le réseau trophique de la rivière Laguna Los Patos, NW Patagonie. Comme pour les valeurs rapportées dans l’aire de répartition d’origine du saumon Chinook, le périphyton et les insectes aquatiques sont les niveaux trophiques qui montrent le plus grand enrichissement de δ15N (5–6 ‰). Comme il s'agit d'une expansion rapide du saumon Chinook en Amérique du Sud, un effort de recherche est nécessaire pour comprendre les mécanismes et les conséquences des apports en substances nutritives provenant des carcasses de saumons dans ces écosystèmes envahis.
  • KEYWORDS: Patagonia, salmonids, freshwater snail, invasive species, periphyton
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  • Arismendi, I., & Soto, D. (2012). Are salmon-derived nutrients being incorporated in food webs of invaded streams? evidence from southern chile. KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS, (405) doi: 10.1051/kmae/2012009
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  • 405
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  • I. Arismendi was supported by Comisión Nacional de Ciencia y Tecnología of Chile (CONICYT) and Millennium Nucleus Forest Ecosystem Services (FORECOS) P04-065-F of Ministerio de Planificación of Chile.
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