Restoration of the Lippe floodplain and the burbot (Lota lota)
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1 Restoration of the Lippe floodplain and the burbot (Lota lota) Margret Restoration Bunzel-Drüke, of the Lippe floodplain and the burbot Matthias Scharf & Olaf Zimball Arbeitsgemeinschaft Biologischer Umweltschutz im Kreis Soest e.v. Bad Sassendorf-Lohne
2 Distribution of the burbot in NRW in the 19. century confirmed population absence of burbot confirmed
3 Distribution of the burbot in NRW in the 19. century confirmed population absence of burbot confirmed Wesel Distribution of the burbot in NRW in 2000 (stocking excluded)
4 Regulated river: stone riprap often used by adult burbot
5 Characteristics of spawning grounds cold (1-4 C) shallow rich in oxygen gentle current at best low predation pressure Lippe burbot spawn in small tributaries reaching the floodplain.
6 Burbot eggs diameter ca. 1 mm
7 Characteristics of burbot larval habitats no (strong) current shallow areas rich in zooplankton low predation pressure and not much competition length ca. 4 mm Where are such habitats in spring?
8 Müller (1960): Biologie der Quappe zwischen Elbe und Oder (Zeitschrift für Fischerei 9 N.F.) Foto: Spree on
9 Inundated floodplain
10 Burbot habitats in the Lippe floodplain: near natural conditions
11 Shortened river course incision (down-cutting) of the stream channel
12 Lippe floodplain: loss of flood channels 1830 and earlier 1980
13 Floodplain still flooded sometimes...
14 ... but... summer embankments separate river from floodplain.
15 Restoration of the Lippe floodplain: project partners The State of North-Rhine/Westphalia Lippeverband The City of Hamm LIFE projects The District of Soest Nordrhein-Westfalen-Stiftung Naturschutz, Heimat- und Kulturpflege Arbeitsgemeinschaft Biologischer Umweltschutz im Kreis Soest e.v.
16 Restoration measures: river bed is widened and raised up
17 Before and after the restoration.
18 river bed widened, lengthened and raised up Margret in the Bunzel-Drüke, floodplain Matthias Scharf & Olaf lakes Zimball, and flood channels restored
19
20 Restored river sections [km] Extent of Lippe restoration measures entfesselt Only river bank reenforcements (riprap) taken out renaturiert Restoration of river and floodplain
21 Study method: standardized electrofishing
22 Individuals / 100 m Individuals / 100 m Reaction of the Lippe burbot population diesjährige Quappen ältere Quappen First restoration First restoration diesjährige Quappen ältere older individuals Quappen young-of-the-year (YOY, 0+)
23 5 km restored floodplain Number of young-of-the-year burbot 2000 no record 1 5 individuals 6 10 individuals individuals
24 m Individuals Individuals / 100 m / 100 m Reaction of the Lippe burbot population diesjährige Quappen ältere Quappen diesjährige Quappen ältere Quappen First restoration 12 First restoration diesjährige young-of-the-year Quappen (YOY, 0+) 10 ältere older individuals Quappen 8
25 Individuals / 100 m Reaction of the Lippe burbot population diesjährige young-of-the-year Quappen (0+) ältere older individuals Quappen First restoration 2 0
26 5 km restored floodplain Numbers of adult and 0+ burbot 2013 no record 1 5 Individuals 6 10 Individuals Individuals > 50 Individuals
27
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29 Thank you for your attention!
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