Náttúrufræðingurinn

Ukioqatigiit

Náttúrufræðingurinn - 1998, Qupperneq 34

Náttúrufræðingurinn - 1998, Qupperneq 34
Kharaka & A.S. Maest). Balkema, Rotterdam. Bls. 477-481. Sigurður R. Gíslason, Stefán Arnórsson & Halldór Armannsson 1996. Chemical weath- ering of basalt in Southwest Iceland: effects of runoff, age of rocks and vegetative/glacial cover. American Journal of Science 296. 837- 907. SigurðurGuðjónsson 1990. Classifícation oflce- landic watersheds and rivers to explain life his- tory strategies of Atlantic salmon. Ph.D,- ritgerð, Oregon State University. 136 bls. Sigurjón Rist 1974. Efnarannsókn vatna. Vatnasvið Hvítár - Ölfusár; einnig Þjórsár við Urriðafoss 1973. Orkustofnun OSV-7405. 29 bls. Sigurjón Rist 1986. Efnarannsókn vatna. Borgar- fjörður; einnig Elliðaár í Reykjavík. Orku- stofnun OS-86070/VOD-03. 67 bls. Svanur Pálsson & Guðmundur Vigfússon 1996. Gagnasafn aurburðarmælinga 1963-1995. Orkustofnun OS-96032/VOD-05 B. 270 bls. Vannote, R.I., G.W. Minshall, K.W. Cummins, J.R. Sedell & C.E. Cushing 1980. The river continuum concept. Can. J. Fish. Aquatic Sci. 37. 130-137. Wuhrmann, K. 1974. Some problems and per- spectives in applied limnology. Mitt. Internat. Verein. Limnol. 20. 324^102. Þorleifur Einarsson 1991. Myndun og mótun lands: jarðfræði. Mál og menning, Reykjavík. 299 bls. ■ SUMMARY Terrestrial influence ön the biota in ICELANDIC RIVERS Chemical composition in rivers is determined by the geology, topography and vegetation cover in the catchment areas (fig. 7, table 1). This seems to determine the productivity of the rivers in the catchment areas as indicated by catch of salmon and density of benthic invertebrates. Catchment areas of Icelandic rivers are described and fluc- tuations of nutrients (figs 8 and 9). Rivers origi- nating in lakes and from areas with extensive cover of vegetation produced much more Atlan- tic salmon (Salmo salar) than rivers originating from barren areas, which only produced few salmon or none (fig 10). Organic matter dril'ting downstream from river headwaters determined species composition of benthic communities. Filter-feeding blackfly larvae (Simulium vittatum) dominated lake outlets (fig. 11), whereas algae-grazing chironomids dominated rivers without lake influence (fíg 12). Glacial riv- ers have the lowest density and diversity of benthic invertebrates of all river groups (fig. 13). The study is supported by the Research Council of Iceland (Science Fund), the Research Fund of the University of Iceland and the Framework of EU (Environment and Climate) to the project AASER (Contract ENV-CT95-0164). PÓSTFANG HÖFUNDa/AuTHORS'ADDRESSES Hákon Aðalsteinsson Orkustofnun / National Energy Authority Grensásvegi 9 IS-108Reykjavík ha@os.is Gísli Már Gíslason Líffræðistofnun Háskólans / Institute of Biology, University of Iceland Grensásvegi 12 IS-108Reykjavík gmg@rhi.hi.is 112
Qupperneq 1
Qupperneq 2
Qupperneq 3
Qupperneq 4
Qupperneq 5
Qupperneq 6
Qupperneq 7
Qupperneq 8
Qupperneq 9
Qupperneq 10
Qupperneq 11
Qupperneq 12
Qupperneq 13
Qupperneq 14
Qupperneq 15
Qupperneq 16
Qupperneq 17
Qupperneq 18
Qupperneq 19
Qupperneq 20
Qupperneq 21
Qupperneq 22
Qupperneq 23
Qupperneq 24
Qupperneq 25
Qupperneq 26
Qupperneq 27
Qupperneq 28
Qupperneq 29
Qupperneq 30
Qupperneq 31
Qupperneq 32
Qupperneq 33
Qupperneq 34
Qupperneq 35
Qupperneq 36
Qupperneq 37
Qupperneq 38
Qupperneq 39
Qupperneq 40
Qupperneq 41
Qupperneq 42
Qupperneq 43
Qupperneq 44
Qupperneq 45
Qupperneq 46
Qupperneq 47
Qupperneq 48
Qupperneq 49
Qupperneq 50
Qupperneq 51
Qupperneq 52
Qupperneq 53
Qupperneq 54
Qupperneq 55
Qupperneq 56
Qupperneq 57
Qupperneq 58
Qupperneq 59
Qupperneq 60
Qupperneq 61
Qupperneq 62
Qupperneq 63
Qupperneq 64
Qupperneq 65
Qupperneq 66
Qupperneq 67
Qupperneq 68

x

Náttúrufræðingurinn

Direct Links

Hvis du vil linke til denne avis/magasin, skal du bruge disse links:

Link til denne avis/magasin: Náttúrufræðingurinn
https://timarit.is/publication/337

Link til dette eksemplar:

Link til denne side:

Link til denne artikel:

Venligst ikke link direkte til billeder eller PDfs på Timarit.is, da sådanne webadresser kan ændres uden advarsel. Brug venligst de angivne webadresser for at linke til sitet.