Fróðskaparrit - 01.01.1999, Side 180

184 RESPONSE TO WAVE EXPOSURE BY LITTORAL SPECIES IN THE FAROE ISLANDS
Lichens / Skónir_________________________________________ Patella spp. and Littorina spp. / Fliður og kúvingar
70 > 80% cover 70 > 200 pr m2
60 50 - 80% cover 60 100 - 200 pr m2
50 20 - 50% cover 50 50 - 100 pr m2
40 1 - 20% cover 40 10 - 50 pr m2
30 Big, separated patches 30 1 - 10 pr m2
20 Small, separated patches 20 1 - 10 pr m2
10 Only 1-2 patches 10 < 1 pr m2
Algae / Algur___________________________________________ Other snails / Aðrir sniglar
70 > 90% cover 70 > 100 pr m2
60 50 - 90% cover 60 50 - 100 pr m2
50 20 - 50% cover 50 10 - 50 pr m2
40 5 - 20% cover 40 1 - 10 pr m2, locally sometimes more
30 Les than 5%, zone clear 30 < 1 pr m2, locally sometimes more
20 Single plants, zone unclear 20 Always less than 1 pr m2
10 Only 1-2 plants 10 < 1 pr 10 m2
Barnacles /Gjar___________________________________ Mussles / Skeljadýr
70 More than 5 pr cm2 70 > 80% cover
60 3 - 5 pr cm2 60 50 - 80% cover
50 1 - 3 pr cm2 50 20 - 50% cover
40 10 - 100 pr dm2 40 Big patches, but less than 20% cover
30 1 - 10 pr dm2 30 Many single individuals or small patches
20 1 - 100 pr m2 20 Single individuals, no patches
10 Less than 1 pr m2 10 < 1 pr m2
Table 1. Scales of abundance for dijferent groups oflittoral organisms according to Árrestad and Lein (1993).
Values are comparable with “Abundance Scale" from Dalby etal. (1978). 70: extra abundant; 60: super
abundant; 50: abundant; 40: common; 30: frequent; 20: occasional; 10: rare.
Talva 1. Nøgd av ymiskum plantu/djórabólkum eftir Árestad og Lein (1993). Virðini kunnu samanberast við
"Abundance scale” hjá Dalby o.ø. (1978). 70: alráðandi, 60: ovurvanlig, 50: sera vanlig, 40: vanlig, 30: rættiliga
vanlig, 20: av og á, 10: sjáldsom.
wave exposure and exposure values for sta-
tions. The method is based on the fact that
species respond differently to wave expo-
sure (Dalby et al., 1978) and the assump-
tion that wave action is the strongest physi-
cal factor influencing the species abun-
dance. For each station, the data input
comprises abundance values for species
and an approximate exposure value (‘first
exposure value’ - FEV). In total, data from
146 stations were compiled. The abun-
dance of the following 23 dominant species
was recorded: The algae Aglaothamnion
sepositum (Gunnerus) Maggs & Hom-
mers., Alaria esculenta (L.) Grev., Asco-
phyllum nodosum (L.) LeJol., Cladophora
rupestris (L.) Kiitz., Corallina offtcinalis
L., Fucus distichus L. ssp. anceps (Harv. &
Ward ex Carruthers) Powell, F. evanescens
C. Agardh, F. spiralis L., F. vesiculosus L.,
Himanthalia elongata (L.) Gray, Laminar-
ia digitata (Huds.) J.V. Lamour., L. saccha-