caa a22 4500 477115756 CHVBK 20180405111622.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00005016 doi (NATIONALLICENCE)springer-10.1007/BF00005016 Ahlgren Molly Department of Biological Sciences, Michigan Technological University, 49931, Houghton, MI, U.S.A. aut Selective ingestion of detritus by a north temperate omnivorous fish, the juvenile white sucker, Catostomus commersoni [Elektronische Daten] [Molly Ahlgren] Synopsis: The capacity of the juvenile white sucker, Catostomus commersoni, to feed selectively on detritus was examined by analyzing gut contents of fish feeding in a northern Michigan pond and in laboratory aquaria. Suckers selected fine particle detritus. The median length of detritus particles consumed by pond suckers ranged from 26-38 μm for all seasons sampled. Although suckers in the pond ingested invertebrates > 215 μm they never ingested detritus particles > 215 μm. Suckers fed pond detritus in laboratory aquaria selectively ingested the fine particle fraction (Kolmogorov-Smirnov test, p < 0.0001). Suckers excluded particles > 220 μm and ingested a median particle size of 54 μm. Amorphous detritus particles comprised 100% of the detritus particles in 93% of the foreguts analyzed. Suckers fed fine particle (< 45 ) pond detritus in laboratory aquaria rejected the inorganic fraction and selectively ingested organicmaterial with the highest protein and energy content. Ash free dry mass (AFDM) as a percent of dry-mass was 2.6 times greater in the foregut contents than in the detritus (p < 0.001). The amino acid concentration and energy density of the ingested organic matter were 1.9 times higher (p < 0.044) and 1.3 times higher (p < 0.025) than the respective amino acid and energy content of the organic fraction of the detritus. These results indicate that suckers have the capacity to consume selectively fine particle detritus with the highest nutritional value. Kluwer Academic Publishers, 1996 Feeding ecology nationallicence Catostomidae nationallicence Fish nationallicence Detritivore nationallicence Food quality nationallicence Diet selection nationallicence Environmental Biology of Fishes Kluwer Academic Publishers 46/4(1996-04-01), 375-381 0378-1909 46:4<375 1996 46 10641 https://doi.org/10.1007/BF00005016 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005016 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Ahlgren Molly Department of Biological Sciences, Michigan Technological University, 49931, Houghton, MI, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 46/4(1996-04-01), 375-381 0378-1909 46:4<375 1996 46 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer