caa a22 4500 477076270 CHVBK 20180405111439.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF02515738 doi (NATIONALLICENCE)springer-10.1007/BF02515738 Vertical foodweb structure of freshwater zooplankton assemblages estimated by stable nitrogen isotopes [Elektronische Daten] [R. France, K. Westcott, P. del Giorgio, G. Klein, J. Kalff] 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. Society of Population Ecology, 1996 zooplankton nationallicence δ15N nationallicence vertical foodweb structure nationallicence France R. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut Westcott K. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut del Giorgio P. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut Klein G. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut Kalff J. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut Researches on Population Ecology Springer-Verlag 38/2(1996-12-01), 283-287 0034-5466 38:2<283 1996 38 10144 https://doi.org/10.1007/BF02515738 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02515738 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- France R. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Westcott K. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- del Giorgio P. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Klein G. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Kalff J. Department of Biology, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 773 0- Researches on Population Ecology Springer-Verlag 38/2(1996-12-01), 283-287 0034-5466 38:2<283 1996 38 10144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer