ISSN:
1573-5117
Schlagwort(e):
trout
;
minnow
;
stickleback
;
reservoir
;
diet
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract Stomach contents of 242 brown trout, 1440 minnow and 368 stickleback from the North Lake and of 121 trout, 1079 minnow and 332 stickleback from the South Lake of an upland reservoir system in Co. Wicklow (Ireland) were analysed. Macroinvertebrates from each reservoir were sampled in September 1982, June and September 1983, and June 1984. A further sampling in September 1984 involved only the South Lake as low water levels prevented littoral samples being taken in the North Lake. Vertical and horizontal hauls of zooplankton were also collected during September 1983 and 1984. The diets of the three species were compared on each date using Spearman Rank Correlation coefficients and Schoener's index of dietary overlap. The diets of the minnow and stickleback regularly showed significant correlation but the trout diet was very different except during periods of very reduced water levels when all species fed on zooplankton.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00007783
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