invasion history of fucus evanescens c. ag. in the baltic sea region and effects on the native biota
TRANSCRIPT
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Invasion history of Fucus evanescens C. Ag. in the Baltic Sea region
and effects on the native biota
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Ishavstång (Fucus evanescens)
Blåstång(Fucus vesiculosus)
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Spridning och etablering av ishavstång i Sverige
Faktorer som påverkar etableringen
Effekter på inhemska arter
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Invasion history of Fucus evanescens C. Ag. in the Baltic Sea region
and effects on the native biota
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Biological invasions
A geographical expansion of a species to an area it has previously not inhabited
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Caulerpa taxifolia
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Fucus evanescens
Bladder-wrack(Fucus vesiculosus)
1 cm
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Questions
Paper I Wikström SA, von Wachenfeldt T & Kautsky L: Establishment of the exotic species Fucus evanescens C. Ag. (Phaeophyceae) in Öresund, Southern Sweden.
(1) How has Fucus evanescens spread and established in Sweden?
(2) Which factors influence the invasion success of F. evanescens?
Paper II Wikström SA & Kautsky L: Effects of the invading brown alga Fucus evanescens on associated biota
(3) Does the introduction affect the native biota?
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Study area
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(1) How has F. evanescens spread and established in Öresund?
First documentation 1948 (harbour of Copenhagen)
Distribution and abundance of F. evanescens investigated 1966-72 and 2000
30 sites investigated
(1) Pattern of spread
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1972 2000
(1) Pattern of spread
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(2) Which factors influence the invasion success of F. evanescens?
(2) Restricting factors
F. evanescens mostly found
- in northern Öresund
- at sheltered sites (harbours)
Salinity?
Wave exposure?
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(2) Restricting factors
Salinity
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(2) Restricting factors
Salinity
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0
20
40
60
80
100
6 8 10 12 14 16 18 20 22 24
salinity (psu)
% g
erm
inat
ed
(2) Restricting factors
Salinity
0.10
0.15
0.20
0.25
0.30
8 10 12 14 16 18 20 22 24 26
salinity (psu)
len
gth
(m
m)
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Wave exposure
(2) Restricting factors
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Wave exposure
Attachment strength - F. evanescens
- F.vesiculosus
- F. serratus
(2) Restricting factors
No difference
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(2) Which factors influence the invasion success of F. evanescens?
Wave exposure? No
Salinity? Probably in southern Öresund
Competition?
(2) Restricting factors
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(3) Associated epibiota
(3) Does the introduction of F. evanescens affect the native biota?
Does the epiphytic and epifaunal community of F. evanescens differ from that of the native F. vesiculosus?
?
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(3) Associated epibiota
0
50
100
150
200
250
300
350
Fv Fe
bio
ma
ss (
mg
g-1
Fu
cus)
epiphytic fauna
epiphytic algae
Biomass
0
1
2
3
4
5
Fv Fe
No
of
spe
cie
s
Species number
14
7
Epiphytes
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(3) Associated epibiota
0
50
100
150
200
250
300
350
Fv Fe
bio
ma
ss (
mg
g-1
Fu
cus)
epiphytic fauna
epiphytic algae
Epiphytes
0
10
20
30
40
50
60
70
80
90
100
Fv Fe
bio
ma
ss (
mg
g-1
Fu
cus
)
isopods
gammarids
gastropods
remaining
Infauna
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(3) Does the introduction of F. evanescens affect the native biota?
Fucus evanescens has
- fewer epiphytic species- less epiphytic biomass- less biomass of motile fauna
(3) Associated epibiota
Does F. evanescens replace F. vesiculosus?
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Thanks to…
My supervisors Lena Kautsky and Ove Eriksson and all people who have contributed with field and
laboratory assistance, statistical advice and scientific discussions.
My family for their support.
Stockholm Marine Research Centre (SMF) provided financial support.
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Why important?
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Wave exposure
0
20
40
60
80
100
120
140
0 10 20 30 40 50
Dry weight (g)
Att
ac
hm
en
t s
tre
ng
th (
N)
F. evanescens
F. vesiculosus
F. serratus
(2) Restricting factors
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Detrended correspondence analysis (DCA)
(3) Associated epibiota
-1
0
1
2
3
-1 0 1 2 3
Axis 1 (24.6%)
Ax
is 2
(11
.6%
)F. evanescens
F. vesiculosus