Fróðskaparrit - 31.12.2000, Blaðsíða 119

TITTLEIKIN AV VANLIGASTU FØROYSKU DýRA- OG TARASLØGUNUM
A KLETTASTROND IMUN TIL YMISK UMHVØRVISVIðURSKIFTI
123
the exposure index. Further, aspect was
highly correlated with the axis. These re-
sults should be interpreted with caution due
to the low number and the limited geo-
graphical range of the sites. It is possible
that fjord effects and aspect were more im-
portant in this area than at other places in
the Faroe Islands. However, the resem-
blance of the ordination plot to that for the
other stations suggested that the same fac-
tor was underlying the first axis in both or-
dinations. For the nine stations all situated
in one fjord system, the fjord index may
have been a more reliable estimator of ex-
posure than the exposure index. The appar-
ent effect of aspect may have been due to a
positive correlation with the fjord index —
in that there happened to be more south-ori-
ented stations farther into the ijord.
Acknowledgements
The field investigations were part of the FARCOS pro-
ject, supported by Amerada Hess, BP, Conoco, Mobil,
Phillips Petroleum and Texaco and of the large BioFar 2
project, supported by the Carlsberg Foundation. The
data treatment was conducted at the Marine Biological
Station, University of Bergen, partly financed by Alpha
Environmental Consultants, NoBaLes (Norwegian Bar-
ents Sea Exploration Co-operation) and OLF (the Nor-
wegian Oil Industry Association). We are also grateful
to Dr. Eivind Oug and Prof. H. John B. Birks, who
helped to improve our understanding of the statistical
methods involved and to cand. scient. Mikaela Kruskopf
for comments on the manuscript.
References
Arrestad, K. and Lein, T.E. 1993. A computer program
(EXPON) for calculation of a biologically based ex-
posure scale. IFM Rapport, Institutt for Fiskeri- og
Marinbiologi 5: 1-22.
Baardseth, E. 1970. Synopsis of biological data on
knobbed wrack Ascophyllum nodosum (Linnaeus)
Le Jolis. FAO Fisheries Synopsis 38: pag.var.
Borgesen, F. 1902. Marine Algae. In: Warming, E. (ed.).
Botany ofthe Færoes based upon Danish investiga-
tions. Part II: 339-532. Copenhagen.
Bðrgesen, F. 1905. The algæ-vegetation of the Færoese
coasts with remarks on the phyto-geography. In:
Warming, E. (ed.). Botany ofthe Færóes based upon
Danish investigations. Part III: 683-834. Copen-
hagen and Christiania.
Bruntse, G., Lein, T.E. and Nielsen, R. (eds.). 1999a.
Marine benthic algae and invertebrate communities
from the shallow waters of the Faroe Islands. A base
line study. Report 1999. Kaldbak Marine Biological
Laboratory. 117 pp.
Bruntse, G., Lein, T.E., Nielsen, R. and Gunnarsson, K.
1999b. Response to wave exposure by littoral
species in the Faroe Islands. Fróðskaparrit 47: 181 -
198.
Chapman, A.R.O. 1995. Functional ecology of fucoid
algae: twenty-tree years of progress. Phycologia
34:1-32.
Connor, D.W., Brazier, D.P., Hill, T.O., Holt, R.H.F.,
Northen, K.O. and Sanderson, W.G. 1996. Marine
Nature Conservation Review: marine biotopes. A
working classification for the British Isles. Version
96.7. Peterborough, Joint Nature Conservation
Committee. 340 pp.
Dalby, D.H., Cowel, E.B., Syratt, W.J. and Crothers,
J.H. 1978. An exposure scale for marine shores in
Western Norway. Journal ofMarine Biological As-
sociation ofUnited Kingdom 58: 975-996.
Hartnoll, R.G. and Hawkins, S.J. 1985. Patchiness and
fluctuations on moderately exposed rocky shores.
Ophelia 24: 53-63.
Hill, M.O. and Gauch, H.G. 1980. Detrended corre-
spondence analysis, an improved ordination tech-
nique. Vegetatio 42: 47-58.
Kruskopf, M. and Lein, T.E. 1997. Biological exposure
scale for Sogn og Fjordane in southwestem Norway.
IFM Rapport, Institutt for Fiskeri- og Marinbiologi
7: 1-21.
Lewis, J.R. 1964. The ecology of rocky shores. English
University Press. London. 323 pp.
ter Braak, C.J.F. 1986. Canonical Correspondence
Analysis: A new eigenvector technique for multi-
variate direct gradient analysis. Ecology 67: 1167-
1179.
ter Braak, C.J.F. 1995. Ordination. In: Jongman,
R.H.G., ter Braak, C.J.F. and van Tongeren, O.F.R.
Data artalysis in community and landscape ecology.
Cambridge University Press. 91-173.