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The stomach contents of Age 1 and older rainbow (Salmo gairdneri) and brown trout (S. trutta) in five southern Appalachian soft-water streams were compared with concurrent drift samples. A wide range of food items was consumed, and no prey genus comprised an average of more than 2.5% by number of the diet of either trout species. Seasonal changes in composition of drift from June to November were generally mirrored by shifts in trout diets. The contribution of terrestrial organisms to drift and to diets was highest in late summer and autumn. Averaged over all samples, terrestrial taxa comprised 36, 45 and 50% of the drift, rainbow and brown trout diets, respectively. Both trout species exhibited statistically significant feeding preferences for particular taxa (notably terrestrial organisms), but most prey were consumed in proportions similar to their abundance in the drift. Opportunistic feeding lends stability to trout populations in streams with relatively low autochthonous food production by allowing trout to capitalize on terrestrial input. Our findings emphasize the importance of both protecting riparian vegetation (which is a source of terrestrial prey) and considering aquatic habitat elements in which trout can efficiently capture surface drift when determining minimum stream flow requirements for water-diversion projects.
The American Midland Naturalist has been published for 90 years by the University of Notre Dame. The connotations of Midland and Naturalist have broadened and its geographic coverage now includes North America with occasional articles from other continents. The old image of naturalist has changed and the journal publishes what Charles Elton aptly termed "scientific natural history" including field and experimental biology. Its significance and breadth of coverage are evident in that the American Midland Naturalist is among the most frequently cited journals in publications on ecology, mammalogy, herpetology, ornithology, ichthyology, parasitology, aquatic and invertebrate biology and other biological disciplines.
Simultaneously an international center for Catholic thought, a teaching-focused liberal arts college, and a dynamic hub for research and scholarship, the College of Arts and Letters at the University of Notre Dame provides its students with an education that fuels their passion for learning while preparing them to make a difference in the world. The largest and oldest college in the university, Arts and Letters houses the divisions of the arts, humanities, and social sciences. It encompasses 21 departments, more than 40 undergraduate and graduate degree programs, and a variety of interdisciplinary centers. Approximately 2,500 undergraduates and 750 graduate students pursue degrees through Arts and Letters programs; students from throughout Notre Dame enroll in thought-provoking Arts and Letters courses.
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The American Midland Naturalist
© 1987 The University of Notre Dame