Fróðskaparrit - 31.12.2000, Side 119

Fróðskaparrit - 31.12.2000, Side 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.
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