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1 Polish Journal of Ecology

1 1999

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Seasonal changes in macrofaunal feeding groups associated with Nuphar lutea (L.) Sm. leaves in a small eutrophic lake

Kornijów R., Ścibior R.

Polish Journal of Ecology

1999

Vol. 47, no 2

135-143

The epiphytic invertebrates associated with leaves of Nuphar lutea in a shallow small eutrophic Lake G?ębokie (Łęczna-W?odawa Lake istrict, eastern Poland) were pooled into one of three feeding groups: 1. algae-detritus feeders (25 taxa, average density 111 ind.x 100 cm^2), 2. vascular plant feeders (3 taxa, average density 64 ind. x 100 cm^-2), 3. predators (10 taxa, 4 ind. x 100 cm ^-2). The faunal feeding assemblages underwent clearly marked seasonal changes in their relative abundance, dominance structure and densities. The discussed mechanisms responsible for these changes included trophic conditions (development of peryphytic and planktonic algae, nutritive value of the macrophytic tissue, amount of detritus originating from decomposing leaves), so called "dilution effect" (caused by fast increase in the colonizable leaf surface during summer), and the interactions between algae-detritus feeders and predatory invertebrates.