Feeding ecology of non-native Siberian prawns, Palaemon modestus (Heller, 1862) (Decapoda, Palaemonidae), in the lower Snake River, Washington, U.S.A.
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We used both stomach content and stable isotope analyses to describe the feeding ecology of Siberian prawns Palaemon modestus (Heller, 1862), a non-native caridean shrimp that is a relatively recent invader of the lower Snake River. Based on identifiable prey in stomachs, the opossum shrimp Neomysis mercedis Holmes, 1896 comprised up to 34-55% (by weight) of diets of juvenile to adult P. modestus, which showed little seasonal variation. Other predominant items/taxa consumed included detritus, amphipods, dipteran larvae, and oligochaetes. Stable isotope analysis supported diet results and also suggested that much of the food consumed by P. modestus that was not identifiable came from benthic sources — predominantly invertebrates of lower trophic levels and detritus. Palaemon modestus consumption of N. mercedis may pose a competitive threat to juvenile salmon and resident fishes which also rely heavily on that prey.
Nous avons utilisé à la fois les contenus stomacaux et les analyses par isotope stable pour décrire l’écologie de l’alimentation de la crevette de Sibérie Palaemon modestus (Heller, 1862), une crevette non indigène qui est un envahisseur relativement récent du bas de la rivière Snake. Sur la base des proies identifiables dans l’estomac, la mysidacé Neomysis mercedis Holmes, 1896, représente jusqu’à 34-55% (en poids) du régime des juvéniles aux adultes de P. modestus, avec peu de variations saisonnières. Les autres items/taxa consommés incluent des détritus, amphipodes, larves de diptères et oligochètes. Les analyses par isotopes stables supportent les résultats du régime et suggèrent aussi que l’essentiel de la nourriture consommée par P. modestus, qui n’était pas identifiable, provient de sources benthiques — de façon prédominante des invertébrés de niveau trophique bas et des détritus. La consommation de N. mercedis par Palaemon modestus représente une menace compétitive pour les juvéniles de saumons et les poissons résidants qui dépendent massivement de cette proie.
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| All Time | Past 365 days | Past 30 Days | |
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Feeding ecology of non-native Siberian prawns, Palaemon modestus (Heller, 1862) (Decapoda, Palaemonidae), in the lower Snake River, Washington, U.S.A.
In: CrustaceanaSearch for other papers by Kenneth F. Tiffan in
Current site
Google Scholar
PubMed
Search for other papers by William R. Hurst in
Current site
Google Scholar
PubMed
We used both stomach content and stable isotope analyses to describe the feeding ecology of Siberian prawns Palaemon modestus (Heller, 1862), a non-native caridean shrimp that is a relatively recent invader of the lower Snake River. Based on identifiable prey in stomachs, the opossum shrimp Neomysis mercedis Holmes, 1896 comprised up to 34-55% (by weight) of diets of juvenile to adult P. modestus, which showed little seasonal variation. Other predominant items/taxa consumed included detritus, amphipods, dipteran larvae, and oligochaetes. Stable isotope analysis supported diet results and also suggested that much of the food consumed by P. modestus that was not identifiable came from benthic sources — predominantly invertebrates of lower trophic levels and detritus. Palaemon modestus consumption of N. mercedis may pose a competitive threat to juvenile salmon and resident fishes which also rely heavily on that prey.
Nous avons utilisé à la fois les contenus stomacaux et les analyses par isotope stable pour décrire l’écologie de l’alimentation de la crevette de Sibérie Palaemon modestus (Heller, 1862), une crevette non indigène qui est un envahisseur relativement récent du bas de la rivière Snake. Sur la base des proies identifiables dans l’estomac, la mysidacé Neomysis mercedis Holmes, 1896, représente jusqu’à 34-55% (en poids) du régime des juvéniles aux adultes de P. modestus, avec peu de variations saisonnières. Les autres items/taxa consommés incluent des détritus, amphipodes, larves de diptères et oligochètes. Les analyses par isotopes stables supportent les résultats du régime et suggèrent aussi que l’essentiel de la nourriture consommée par P. modestus, qui n’était pas identifiable, provient de sources benthiques — de façon prédominante des invertébrés de niveau trophique bas et des détritus. La consommation de N. mercedis par Palaemon modestus représente une menace compétitive pour les juvéniles de saumons et les poissons résidants qui dépendent massivement de cette proie.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 378 | 41 | 2 |
| Full Text Views | 176 | 1 | 0 |
| PDF Views & Downloads | 21 | 3 | 0 |