It must not be coincidence then that the only major radiation of flightless carnivorous birds (phorhusracids) happened in conjunction with very ineffective mammalian opposition (i.e. the presence of the birds limited carnivorous mammal diversity and not vice-versa)
From: John Bois <email@example.com>
Sent: Saturday, October 14, 2017 7:17 AM
To: Ronald Orenstein; Yazbeck, Thomas Michael
Cc: Tim Williams; firstname.lastname@example.org
Subject: Re: [dinosaur] Evolution of giant flightless birds (free pdf)
Yes...and it seems with extant big birds that predation is a much greater limiting factor than competition. Competitive exclusion demands identical or very similar niche requirements...definitely not relevant here. I suppose competition may have been more important between carnivorous species.
On the other hand an explanation could be that both predation and competition were involved in limiting large avians' diversity: large birds were outcompeted by mammals because they could not tolerate high predation load due to reproductive mode (much as certain barnacles cannot tolerate the dry upper intertidal zone).
On Fri, Oct 13, 2017 at 10:31 PM Yazbeck, Thomas Michael <email@example.com> wrote: