Vertical foodweb structure of freshwater zooplankton assemblages estimated by stable nitrogen isotopes |
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Authors: | R France K Westcott P del Giorgio G Klein and J Kalff |
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Institution: | (1) Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1 Montreal, Quebec, Canada |
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Abstract: | Although theoretical foodweb models predict the presence of only three to four trophic categories, estimation of “potential”
vertical foodweb structure from species lists and inferred feeding interactions suggest that as many as 7 trophic categories
can occur in the pelagic foodwebs of North American glaciated lakes. A compilation of data on the nitrogen isotopic composition
of zooplankton from 46 Canadian Shield lakes suggested the average existence of one “realized” trophic category in addition
to that of filter-feeding, herbivorous cladocerans. When phytoplankton, planktivorous invertebrates, and plantivorous and
piscivorous fish are included, the vertical foodweb structure in the pelagic zones of these lakes are greater than those hypothesized
from some theoretical models. |
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Keywords: | zooplankton δ 15N vertical foodweb structure |
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