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FW: Concavenator corcovatus, a new humped carcharodontosaurid from Las Hoyas



Dann, Kris,
 
Won't argue. Of course Dann makes sense here. I just got too close to a single
elemental cause. Perhaps what bothers me on this one is the supposed energy 
costs
to doing this. Then again .....                 
 
dale


----------------------------------------
> Date: Wed, 15 Sep 2010 21:37:46 -0400
> From: saurierlagen1978@gmail.com
> To: dannj@alphalink.com.au; wdm1949@hotmail.com; dinosaur@usc.edu
> Subject: Re: FW: Concavenator corcovatus, a new humped carcharodontosaurid 
> from Las Hoyas
>
> Dale... Dann pretty much beat me to the punch. Rather than parrot
> him, I'll just say "I agree with Dann" ;-)
>
> Kris
>
>
> On Wed, Sep 15, 2010 at 8:14 PM, Dann Pigdon wrote:
>> On Thu, Sep 16th, 2010 at 9:27 AM, dale mcinnes wrote:
>>
>>> If sexual behavior is at the root cause of the elongation of spine growth 
>>> then,
>>> why DON'T we see more of this in other clades?? This should be occurring 
>>> everywhere
>>> since sexual selection is also everywhere in every clade and NOT dependent 
>>> on envir-
>>> onmental regimens.
>>
>> There are numerous reasons why neural spine elongation wasn't always the 
>> 'sexiness of choice':
>>
>> 1) Not all species may have used visual displays to attract mates. Some may 
>> have used scent,
>> song, or courtship 'dances'. Sometimes all you need to get the girls is to 
>> be able to kick your
>> opponents' arses in intraspecific combat - where in fact a lack of impeding 
>> adornments might even
>> be an advantage.
>>
>> 2) Of those that used visual displays, bright colouration may have been 
>> preferable to changes in
>> body form. Perhaps those species that resorted to costly changes in body 
>> form simply lacked the
>> genetic resources to evolve bright colours or bold markings.
>>
>> 3) Elongated neural spines may have been just one type of display structure. 
>> Crests, frills, horns,
>> spikes and plates may have also been primarily for display purposes in some 
>> species.
>>
>> --
>> _____________________________________________________________
>>
>> Dann Pigdon
>> Spatial Data Analyst Australian Dinosaurs
>> Melbourne, Australia http://home.alphalink.com.au/~dannj
>> _____________________________________________________________
>>
>>