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• W2046899008 abstract "Association analysis of data on benthic macroinvertebrates in 257 samples from Georgian Bay, followed by discriminant analysis of water and sediment characteristics, facilitated a quantitative description of trophic variability within a relatively unpolluted system. Discriminating variables were bottom water temperature, water pH and Ca, sediment organic matter, sand, silt, clay, total P, Zn, Pb, and Hg. Four discriminating functions, accounting for 86% of variance, indicated the importance of temperature first, concentrations of organic matter and silt (with sand negative) second, and, in the third and fourth functions, water pH and Ca. Associations which occurred at cooler temperatures consisted of Pontoporeia hoyi with dominant oligochaetes and chironomids generally determined by sediment richness (organic matter and silt content primarily). These associations were P. hoyi — Limnodrilus hoffmeisteri — Chironomus spp. and Procladius spp. at highest sediment richness, P. hoyi — Spirosperma ferox-Micropsectra spp. at intermediate richness and P. hoyi — Stylodrilus heringianus — Heterotrissocladius sp. at lowest richness. Associations in warmer waters consisted of a Chironomus spp. — Chaoborus spp. association in richer sediments and an association of Caecidotea racovitzae and Amnicola spp. at lower sediment richness. A Hexagenia limbata––Hyalella azteca association occurred over a broad range in concentrations of organic matter and silt, but, in terms of sediment texture represented by sand content, this association was intermediate between the other two groups in warmer waters. Finally, a Zalutschia zalutschicola — Chaoborus spp. association, which occurred in only one bay where seasonal acidification was suspected, was related to water pH and Ca in discriminant analysis. These observations on distribution of benthic macroinvertebrates in response to abiotic gradients in a relatively unpolluted system should assist in interpretation of observations on enriched systems where influences of natural and cultural factors often may be confounded." @default.
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• W2046899008 date "1987-01-01" @default.
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• W2046899008 title "Benthic Macroinvertebrate Associations in Relation to Environmental Factors in Georgian Bay" @default.
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• W2046899008 doi "https://doi.org/10.1016/s0380-1330(87)71654-2" @default.
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