William Hurst Kenneth F. Tiffan 2016 <p><span>We used both stomach content and stable isotope analyses to describe the feeding ecology of Siberian prawns </span><i>Palaemon modestus</i><span> (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 </span><i>Neomysis mercedis</i><span> Holmes, 1896 comprised up to 34-55% (by weight) of diets of juvenile to adult </span><i>P. modestus</i><span>, 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 </span><i>P. modestus</i><span> that was not identifiable came from benthic sources — predominantly invertebrates of lower trophic levels and detritus. </span><i>Palaemon modestus</i><span> consumption of </span><i>N. mercedis</i><span> may pose a competitive threat to juvenile salmon and resident fishes which also rely heavily on that prey.</span></p> application/pdf 10.1163/15685403-00003553 en BRILL Feeding ecology of non-native Siberian prawns, <i>Palaemon modestus</i> (Heller, 1862) (Decapoda, Palaemonidae), in the lower Snake River, Washington, U.S.A. article