50
Batrachium fluitans (S)
Scirpus
40
Polygenum (F)
Reflectance (%)
Isoetes (S)
30
Phragmites/Solanum
Phragmites
Equisetum
20
Deepwater
10
0
400
500
600
700
800
900
1000
Wavelength (nm)
Figure AD-SG-1. Above surface reflectances measured over different aquatic
macrophyte species in Cefni Reservoir, North Wales, UK. Measurements were made
using a Spectron SE590 spectroradiometer with a 15 field of view and referenced to
above-surface measurements of downwelling irradiance obtained using a second
sensor head fitted with a cosine correcting hemispherical receptor (from Malthus and
George 1997).