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Dynamics of macroinvertebrate drift in a lowland river

Macroinvertebrate drift in the fourth order section of the lowland Drzewiczka River was investigated in the main types of habitats, over the annual cycle. The percentage of macroinvertebrate biomass in the water column in the total transported organic matter was low. Terrestrial invertebrates, mainly winged insects, varied among seasons and habitats, reaching from 13.1% to 49.8% of total drift biomass. Abundance of aquatic macroinvertebrates was roughly congruent with the ranges of values reported from other rivers and differed from habitat to habitat, season to season and between season x habitat pairs (two-way ANOVA). Among agile swimmers Ephemeroptera while among the other taxa Orthocladiinae and Tanytarsini (Chironomidae) and Naididae (Oligochaeta) showed the highest propensity to drift.

Dynamics of macroinvertebrate drift Dynamics of macroinvertebrate drift

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