Periphyton biomass,potential production and respiration in a shallow lake during winter and spring |
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Authors: | Lone Liboriussen Erik Jeppesen |
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Institution: | 1.Department of Freshwater Ecology, National Environmental Research Institute,Aarhus University,Silkeborg,Denmark;2.Department of Plant Biology,Aarhus University,Aarhus,Denmark |
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Abstract: | Abundance, depth distribution, potential productivity and respiration of periphyton on short-time (1 month) and long-time
incubated strips were followed monthly during the winter–spring (January–May) transition in a shallow eutrophic lake. A taxonomic
shift occurred from dominance of diatoms under ice to chlorophyte dominance in spring communities on the long-time incubated
strips, while diatoms dominated until May on the short-time incubated strips. Periphyton biomass accrual was low during the
ice-covered winter months (November–January: 4 mg chl a m−2 month−1), but increased to a maximum of 112 mg chl a m−2 month−1 immediately after ice-out in February. During February–April, the biomass remained constant before declining in May. Periphyton
on long-time incubated strips was equally distributed in the water column in winter (January–February), but was higher near
the water surface in spring (March–May). Periphyton did not change with depth on the short-time incubated strips. The potential
production to respiration ratio (P/R) was negatively correlated with periphyton biomass. Throughout the study, P/R was <1
for the short-time incubated periphyton, while this was only the case in March–April for the long-time incubations. This study
showed a high productive capacity of winter periphyton, resulting in accumulation of a relatively high periphytic biomass
early in the season. A massive periphyton density in eutrophic lakes already in winter–spring may potentially delay or prevent
the establishment and re-occurrence of submerged macrophytes in the early oligotrophication phase following a reduction of
the external nutrient loading.
Handling editor: Luigi Naselli-Flores |
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Keywords: | Benthic algae Winter dynamics Biomass accrual Respiration Production Periphyton |
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