caa a22 4500 47711573X CHVBK 20180405111622.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00005018 doi (NATIONALLICENCE)springer-10.1007/BF00005018 Spatial and annual variation in the diets of juvenile smallmouth bass, Micropterus dolomieu [Elektronische Daten] [Robert Easton, Donald Orth, J. Voshell Jr.] Synopsis: We measured macroinvertebrate densities and abundance, size, and diet of juvenile smallmouth bass, Micropterus dolomieu, at five sites located at varying distances from a metalimnetic release dam. We used these data to determine the influence of high prey abundances on stomach fullness and age-0 year-class strength. Summer diets of juvenile smallmouth bass (27.7-107.7 mm total length) were dominated by Ephemeroptera (primarily Baetidae) but diet composition was highly variable among years and sites. A linear index of prey selection showed that Ephemeroptera were preferred and Trichoptera were avoided at all sites in all years; but, selection indices were not consistent for Chironomidae or Amphipoda and Isopoda. In two of three years, stomach fullness (gut content mass relative to predicted maximum) of juvenile smallmouth bass decreased with distance downstream of the dam, which reflected patterns observed in benthic macroinvertebrate densities. However, in 1989 when flooding and increased turbidity reduced abundances of juvenile smallmouth bass, no differences in stomach fullness were found among sites. High stomach fullness of juvenile smallmouth bass was attributed to high prey abundances near the dam in years of low or normal streamflow. However, patterns in juvenile smallmouth bass abundances in mid-summer could not be attributed to longitudinal variation in prey abundance. Kluwer Academic Publishers, 1996 Stomach fullness nationallicence Tailwater nationallicence Ephemeroptera nationallicence Baetidae nationallicence Diet breadth nationallicence Prey selection nationallicence Easton Robert Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, 24061-0321, Blacksburg, VA, U.S.A. aut Orth Donald Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, 24061-0321, Blacksburg, VA, U.S.A. aut Voshell Jr. J. Department of Entomology, Virginia Polytechnic Institute and State University, 24061-0319, Blacksburg, CA, U.S.A. aut Environmental Biology of Fishes Kluwer Academic Publishers 46/4(1996-04-01), 383-392 0378-1909 46:4<383 1996 46 10641 https://doi.org/10.1007/BF00005018 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005018 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Easton Robert Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, 24061-0321, Blacksburg, VA, U.S.A aut NATIONALLICENCE 700 1- Orth Donald Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, 24061-0321, Blacksburg, VA, U.S.A aut NATIONALLICENCE 700 1- Voshell Jr J. Department of Entomology, Virginia Polytechnic Institute and State University, 24061-0319, Blacksburg, CA, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 46/4(1996-04-01), 383-392 0378-1909 46:4<383 1996 46 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer