[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Waimanu
I said:
> Yes...but perhaps the lack of diversity among small size classes (due to
avian competition/predation) >placed the whole pterosaur taxon on a ratchet
of no return. They were doomed to low diversity of size >classes at least.
This is problematic from a taxon-wide standpoint.
My understanding is that large species (w/low reproduction rates, etc.) are
more prone to extinction. This would seem to require a more or less
constant refuelling from among the smaller species from the same taxon.
This fuel may not have been present.for pterosaurs--if true they may have
been doomed, period.
Also, please excuse my Yogi Bera moment: "ratchet of no return".
- References:
- Waimanu
- From: john bois <jbois@verizon.net>