You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seed Size and Mass in Relation to Environment
Proceedings of the Royal Society of London. Series B, Biological Sciences
Vol. 186, No. 1083 (Jun. 11, 1974), pp. 83-88
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/76316
Page Count: 6
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Propagule masses are here recorded for shade-tolerant species belonging to 20 genera which show an average of about three-and-one-third times the mass of the propagules of cogeneric species of open habitats. These are additional to the 30 genera already reported on by the author. Propagules of cornfield weeds belonging to 18 genera are shown to exhibit greater masses than their congeners, even though some of these are shade-tolerant, and this, it is suggested, may be the outcome of the prolonged selective effect of 'winnowing'. Other causes of heavy propagules of open-habitat species are suggested, indicative of natural selection.
Proceedings of the Royal Society of London. Series B, Biological Sciences © 1974 Royal Society