Well, negative in the sense that individuals and their genes are being taken out of the pool, rather than having enhanced reproduction. You could have both at once, duller colored Fritillarias in the wild (yellows removed), and brighter ones in cultivation (yellows preferentially propagated). Humans are certainly big drivers of change...either on purpose, or by default or unconscious actions. Robert Warm, sunny, and still dry in San Francisco. Irrigating the Mediterranean geophytes. On Tue, Dec 8, 2020 at 6:49 AM rrodich--- via pbs < pbs@lists.pacificbulbsociety.net> wrote: > Good old human negative selection... > > > No! It is positive selection. This is why the species is surviving,and > not rare or extinct. > > Rick Rodich > Minneapolis, MN > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>