Further improvements in water quality of the Dutch Borderlakes : two types of clear states at different nutrient levels
| Autor: | Edwin T. H. M. Peeters, Ruurd Noordhuis, Gerben J. van Geest, Bastiaan G. van Zuidam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Aquatic Ecology and Water Quality Management Quagga mussel Quagga Mussel Population 010501 environmental sciences Aquatic Science Cyanobacteria mossels 01 natural sciences Planktothrix Dreissena water quality Macro-algae Regime shift abramis brama Alternative stable states aquatic ecology Alternative stable state Biomanipulation randmeren Dominance (ecology) cyanobacteriën education Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences algae education.field_of_study WIMEK biology Ecology 010604 marine biology & hydrobiology aquatische ecologie waterkwaliteit Aquatische Ecologie en Waterkwaliteitsbeheer algen biology.organism_classification Fishery mussels eutrophication Eutrophication eutrofiëring |
| Zdroj: | Aquatic Ecology, 50(3), 521-539 Aquatic Ecology 50 (2016) 3 |
| ISSN: | 1386-2588 |
| DOI: | 10.1007/s10452-015-9521-8 |
| Popis: | The Borderlakes are a chain of ten shallow, largely artificial, interconnected lakes in the Netherlands. The ecological recovery of the central Borderlakes (viz. lake Veluwe and Wolderwijd) has been well documented. These lakes shifted from a eutrophic, Planktothrix dominated state in the 1970s to a clear state in 1996. Around 2010, the formerly hypertrophic, southern Borderlake Eem also reached a clear state, but at considerably higher nutrient levels. In this paper, monitoring data are used to compare these changes and identify the differences in driving processes and their consequences. The 1996 shift in Lake Veluwe was linked to increased fishery for benthivorous Bream, followed and stabilized by increase in Zebra Mussels and charophytes. Nutrients in Lake Eem decreased as well and Planktothrix disappeared here too in 1996, despite relatively high TP concentrations which remained stable over time. The start of the change into the clear state in this case also involved a decrease in the Bream population, but with a stronger additional role for dreissenids, particularly of Quagga Mussels. Remaining blooms of cyanobacteria almost disappeared, but the current situation in Lake Eem represents a different type of clear water state than in the central Borderlakes. This type is characterized by the combination of a relatively high phosphorus load, intense dreissenid filtration and filamentous macro-algae instead of either blooms of cyanobacteria or dominance of charophytes. With the dominant role of the River Eem, the relatively short residence time and increasing difficulty to bring down nutrient loading any further, the stability of this clear state depends on high densities (and filtration rates) of dreissenids. |
| Databáze: | OpenAIRE |
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