Wave exposure Poland habitat mapping Oslo Workshop 2007-05-29 Martin Isæus 08-16 10 11 [email protected]
Apr 01, 2015
Wave exposure
Poland habitat mapping Oslo Workshop
2007-05-29
Martin Isæus
08-16 10 [email protected]
Effekter på biotan
Direct effects Pressure and drag forcesWater movements, whip-lash etc
Indirect effectsSorting of sediments, erosion
Correlations with secchi-depth and salinity
Example from Askö
SweExp
NorExpFinExpBaltExp?ThaiExp?
SweExp Bohuslän
Preliminär klassning
Detalj Väderöarna
Detalj Väderöarna
Sites for Biological exposure index
BioEx
R2 = 39.6
STWAVE
R2 = 36.2
SWM
R2 = 55.2
FWM
R2 = 48.9
High
energy
Moderate
energy
Low
energy
Sheltered
Very sheltered
Extremely sheltered
Ultra sheltered
Exposed
Extremely exposed
Moderately exposed
Very exposed
Used for preliminary exposure classes
List of A1 species
Field stations
Opstad 1981
Lein et al 1998
Klavestad 1954
Iversen 1981
A1 n = 233
A3 n = 126
Histogram (A1, Himanthalia elongata)
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
LogSWM
11%
21%
32%
43%
54%
Pe
rce
nt
of
ob
s
Histogram (A1, Ascophyllum nodosum)
5 6 7 8 9 10 11 12 13 14
LogSWM
0102030405060708090
No
of
ob
s
Histogram (A3, Ruppia maritima)
5 6 7 8 9 10 11 12 13 14 15
LogSWM
02468
1012
No
of o
bs
Examples on species distributions in relation to wave exposure