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The invertebrate community of submergedNuphar lutea (L.) leaves in the River Great Ouse

✍ Scribed by Bass, J. A. B. ;Leach, D. V. ;Pinder, L. C. V.

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 163 KB
Volume: 13
Category: Article
ISSN: 0886-9375
DOI: 10.1002/(sici)1099-1646(199705)13:3<259::aid-rrr453>3.0.co;2-9

No coin nor oath required. For personal study only.

✦ Synopsis

The densities of important ®sh-food organisms associated with submerged Nuphar lutea leaves during late spring and summer were studied in a main river channel and an adjacent side channel over three years. The abundance of micro crustacea varied substantially between years with potentially important consequences for the growth and survival of some species of juvenile ®sh. Densities of micro crustacea and of Chironomidae were much reduced in all years after mid summer. When invertebrate abundance is low, roach (Rutilus rutilus) ingest aufwuchs unselectively, including detritus and algae, although some species, including common bream (Abramis brama) continue to be selective for invertebrates. During periods when invertebrate densities were low bream were often found with empty guts while those of roach were usually ®lled with aufwuchs (R. H. K. Mann, personal communication). It is suggested that the availability of food organisms may be an important factor in¯uencing the success of selective feeders, such as bream.

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