[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]


On Tue, 6 Feb 2001 darren.naish@port.ac.uk wrote:

> Pterosaurs and birds probably didn't compete directly, but as 
> pterosaur lineages died out, their ecological roles may have been 
> occupied by birds.

I'm not sure how one would go about estimating the level of
competition--or predation, by birds.  I would think there would be great
competition for nest sites, prey, etc.

> So-called competitive replacement is probably rare 
> (see Benton 1996). 

I'll check it out.

> These observations imply that birds outcompete diurnal bats when the 
> two coexist... maybe this is because bat flight apparatus is more fragile 
> than feathers or, more reasonably, that bats are inherently constrained 
> by their thermoregulatory abilities (bats overheat quicker in sunlight 
> and cool quicker in cold air than birds - obviously because of their 
> largely naked patagia). Could the same have been at all true of 
> pterosaurs?

Also, carrying bat baby on board would be a constraint in an airborne