1st Meeting Odense Harbour Mussel Project 26 June 2015

Transcription

1st Meeting – June 26 2015 (Fjord-Lab, Kerteminde)
Odense Harbour Mussel Project
Florian Lüskow, Baojun Tang, Hans Ulrik Riisgård,
Camille Gros & Sébastien Delaunay
A pilot project to assess the feasibility of cleaning sea water in Odense harbour
by means of filter-feeding blue mussels on suspended nets
[email protected]
1st Meeting – June 26 2015 (Fjord-Lab, Kerteminde)
Odense Harbour Mussel Project
Attendants:
Florian Lüskow (SDU)
Baojun Tang (SDU)
Hans Ulrik Riisgård (SDU)
Camille Gros (SDU)
Sébastien Delaunay (SDU)
Mads Anker van Deurs (NordShell)
Richard Jensen (Odense Kommune)
Outline
I
Goals & Study area
II
Hydrography
III
Mussel larval population
IV
Larval settlement
V
Mussel growth studies
VI
Outlook
Florian Lüskow
Goals
developments in the harbour area but still a problem
with green and turbid water
Odense Kommune asked for a solution to improve
the water clarity (mussels as bio-filters)
to follow appearance of veliger larvae, settlement,
and growth of juvenile mussels in the harbour area
taking the hydrography into account
pilot growth study to estimate their potential feeding
impact
harsh growth conditions (low salinity, high algal conc.)
Florian Lüskow
Goals
How many mussels are needed to control the algal
population?
Are blue mussels realising their maximal filtration
potential in the Odense harbour?
How big is the background filtration capacity of the
local mussel population?
How is the water moving in the harbour?
What factors affect the salinity in the harbour?
Florian Lüskow
Study area
5
0
4
2
3
1
Florian Lüskow
#0
Kerteminde Fjord
#1
Inner Harbour
#2
Middle Harbour
#3
Mussel Test Unit
#4
Ruslandkaj
#5
Odense Channel
Day 0: 11/5/2015
Hydrography – Development
25
25
#4 Ruslandkaj
T (°C), S, Chl a (µg l-1)
#3 Mussel Test Unit
20
15
10
5
T
S
20
15
10
5
Chl a
T
0
0
10
20
30
40
50
0
Chl a
10
20
30
40
50
25
25
#0 Kerteminde Fjord
#5 Odense Channel
S
0
20
15
10
5
T
S
20
15
10
Danish coastal average (5.1 µg l-1)
5
Chl a
0
0
0
10
20
30
40
50
0
10
20
30
Time (d since start)
Florian Lüskow
40
50
Date: 16/6/2015
Hydrography – Vertical profiles
Temperature (°C) / Salinity /
Chl a concentration (mg l-1)
Temperature (°C) / Salinity /
Chl a concentration (mg l-1)
0
10
20
0
30
10
20
30
0
0
T
Chl a
2
4
Depth (m)
Depth (m)
S
2
4
T
6
6
#3 Mussel Test Unit
10
20
0
30
0
0
1
1
2
4
10
20
30
2
3
3
YSI 650
Chl a
#4 Ruslandkaj
Depth (m)
Depth (m)
0
S
T
S
Chl a
#5 Odense Channel
Florian Lüskow
4
T
S
Chl a
#0 Kerteminde Fjord
300
Larval density (ind. 5 l-1)
#0
#3
#5
200
100
0
0
10
20
30
Day 0: 11/5/2015
http://www.molluscs.at/images/weichtiere/musc
heln/mytilus_veliger1.jpg
Florian Lüskow
40
50
Florian Lüskow
Larval settlement
Weekly investigation of 10 cm of rope (epiphytes)
first record of spat on June 23 2015 (3 ind. < 1 mm)
Florian Lüskow
5
Buoy
Frame
4
3
Anchor
2
1
Florian Lüskow
Condition index
Code
G0
Kert 1
Kert 2
Kert 3
G0
Mussel 1
Mussel 2
Mussel 3
G0
Mid 1
Mid 2
Mid 3
G0
Rus 1
Rus 2
Rus 3
L (mm)
22.5 ± 1.6
23.8 ± 1.8
DW (mg)
75.3 ± 24.9
98.9 ± 30.7
CI (mg cm-3)
6.9 ± 2.9
7.2 ± 1.5
22.5 ± 1.6 75.3 ± 24.9
25.1 ± 1.9 106.3 ± 29.4
6.9 ± 2.9
6.7 ± 1.6
22.5 ± 1.6 75.3 ± 24.9
25.8 ± 1.6 148.6 ± 34.6
6.9 ± 2.9
8.6 ± 1.6
22.5 ± 1.6 75.3 ± 24.9
25.3 ± 1.8 133.5 ± 39.0
6.9 ± 2.9
8.2 ± 2.3
t = 0, 2, 4, and 6 weeks, n = 30, Mean ± SD
Florian Lüskow
Outlook – Vertical transect
Surface
Depth: 2 m
0:43
2:55
Bottom
Kerteminde Fjord
0:14
0:14
0:13
© Kim Lundgreen 2012
Florian Lüskow
Outlook – Vertical transect, SOD
Florian Lüskow
Outlook – Water movements and exchange
5
4
2
http://www.ngdir.ir/Data_SD/GeoLab/Pi
cs/GeoLabPic_2486_2.jpg
3
1
Florian Lüskow
Outlook – Full scale mussel growth study
http://nordshell.dk/wp-content/uploads/2014/02/forside1box.jpg
Florian Lüskow
Thank Odense Kommune for financial support!
Thank you for your attention!
Pictures taken by Florian Lüskow

1st Meeting Odense Harbour Mussel Project 26 June 2015

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