Náttúrufræðingurinn - 1993, Qupperneq 77

perate Australian rice ftelds following
pasture reotation and continuous crop-
ping. Journal of Applied Ecology 22.
875-884.
Porsild, 1967. Lupinus arcticus Wats
grown from seeds of Pleistocene age.
Science 158. 113-114.
Priestley, C.A. & M.A. Posthumus 1982.
Extreme longevity of lotus seeds from
Pulantien. Nature 299. 148-149.
Probert, R. 1992. Seeds of success. Na-
ture 359. 450.
Raven, P.H. R.F. Evert & S.E. Eichhorn
1992. Biology of Plants, 5. útgáfa.
Worth Publishers, Inc. 791 bls.
Roberts, H.A. 1981. Seed banks in soils.
Advances in Applied Biology 6. 1-55.
Salisbury, E.J. 1942. The Reproductive
Capacity of Plants. Bell & Sons, Lon-
don.
Silvertown, J.W. 1980. Seed size, lifespan
and germination date as co-adapted fea-
tures of plant life history. American
Naturalist 118. 860-864.
Silvertown, J.W. 1988. The demographic
and evolutionary consequences of seed
dormancy. I Plant Population Biology
(ritstj. A.J. Davy, M.J. Hutchings &
A.R. Watkinson), BES Symposium, 28.
Blackwell Scientific Publications. Bls.
205-219.
Stearns, S.D. 1976. Life-history tactics: a
review of ideas. Quaterly Review of Bi-
ology 51. 3-47.
Sturla Friðriksson 1975. Surtsey. Evolu-
tion of life on a volcanic island.
Butterworths. London.
Taylor, D.W. 1982. Reproductive biology
of early seed plants. BioScience 32. 23-
28.
Temple, S.A. 1977. Plant-animal mutual-
ism: coevolution with the dodo leads to
near extinction of plant. Science 197.
885-886.
Thompson, K. & J.P. Grime 1983. A com-
parative study of germination respons-
es to diurnally flutctuating tempera-
tures. Journal of Applied Ecology 20.
141-156.
Tiffney, B.H. 1986. Evolution of seed dis-
persal syndromes according to the fos-
sil recores. í Seed Dispersal (ritstj. D.R.
Murray). Academic Press. Bls. 273-305.
Wareing, P.F. & l.D.J. Phillips 1970. The
Control of Growth and Differentiation
in Plants. Pergamon Press. 303 bls.
Wells, T.C.E. 1981. Population ecology
of terrestrial orchids. I The Biological
Aspects of Rare Plant Conservation
(ritstj. H. Synge). John Wiley & Sons
Ltd. Bls. 281-295.
Westoby, M. 1981. How diversified seed
germination behavior is selected. Ameri-
can Naturalist 118. 882-885.
Whitmore, T.C. 1977. Palms of Malaya.
Oxford University Press. 132 bls.
Wing, S.L. & Tiffney, B.H. 1989. Angio-
sperms and herbivorous tetrapods. í The
Origins of Angiosperms and their Bio-
logical Consequences (ritstj. E.M. Friis,
W.G. Chaloner & P.R. Crane). Cam-
bridge University Press. Bls. 203-224.
Þóra Ellen Þórhallsdóttir 1993. Líffræði
og þróun fræja. Náttúrufræðingurinn 63.
57-76.
PÓSTFANG HÖFUNDAR
Þóra Ellen Þórhallsdóttir
Líffrœðistofnun Háskólans
Grensásvegi 12
108 REYKJA VÍK
199