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RE: Australian ferns

  • Subject: RE: [ferns] Australian ferns
  • From: "Winter, Wim de" Wim.dewinter@wur.nl
  • Date: Wed, 5 Apr 2006 09:55:48 +0200
  • Content-class: urn:content-classes:message
  • Thread-index: AcZYMhUzj61CYpYQRbyfwg+SK+R8kgAU5rwA
  • Thread-topic: [ferns] Australian ferns

If the entire population of a species goes through a single individu bottleneck, the loss of genetic variation will be such that from a conservational point of view little has been gained beyond extinction. It's a good thing that after such a rescue we can still admire representatives of the species, but one might wonder whether it is still capable of functioning as a true species.


-----Original Message-----
From: owner-ferns@hort.net [mailto:owner-ferns@hort.net]On Behalf Of
Peter Bostock
Sent: Tue, April 04, 2006 23:47 
To: ferns@hort.net
Subject: RE: [ferns] Australian ferns

 Hi, Bob,


There are also increasing arguments about cost of protecting species
whose populations may have reached critical viability levels. However in
many cases, the only non-viable population for some ferns is zero, since
many have vegetative reproduction and a single plant can persist for a
very long time as rhizome growing ahead and dying off behind. Pteridium
springs to mind, but also Microsorum, Drynaria and many others in
Polypodiaceae, Thelypteridaceae etc.


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