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

Re: dino-lice



And another one, bit more directly relevant:

Carbone et al 2011: Intra-guild competition and its implications for
one of the biggest terrestrial predators, Tyrannosaurus rex

http://rspb.royalsocietypublishing.org/content/early/2011/01/20/rspb.2010.2497.short



On 19 April 2011 03:39, Vivian Allen <mrvivianallen@googlemail.com> wrote:
> Here we go: published arguments for discussion
>
> Ruxton & Houston 2004: Obligate vertebrate scavengers must be large
> soaring fliers.
>
>  http://www.ncbi.nlm.nih.gov/pubmed/15135041
>
> Can't get the full pdf because I'm in a hotel. Looks pretty good though?
>
>
> Viv
>
>
> On 19 April 2011 03:30, Augusto Haro <augustoharo@gmail.com> wrote:
>> 2011/4/18 Tim Williams <tijawi@gmail.com>:
>>
>>> When it comes to feeding on a carcass, the alvarezsaurs might well
>>> have been the last to arrive at the scene.
>>
>> Yes, but in this case the specialized morphology of the forelimb seems
>> not so important for hide-cutting or breaking if carrion-eating.
>>
>>> Having high visual and/or
>>> olfactory acuity may not have been so important, because (a) many
>>> carcasses would have been huge and (b) alvarezsaurs could be your
>>> typical camp-followers, and trailed larger predatory theropods with a
>>> view to a kill.
>>
>> If large dinosaurs had low population densities, finding one by itself
>> would be difficult, more making a living of these. In addition, for
>> visual animals, it depends on how much exposed the corpse was. The
>> possibility of finding one also would depend on how fast animals with
>> greater acuity ingested the carcass after coming before. This does not
>> count if following animals with better senses, or if not living
>> primarily on corpses.
>>
>>> I'm not suggesting that alvarezsaurs were obligate scavengers.
>>> However, as noted by Longrich & Currie (2008), ant nests were likely
>>> rare in the Mesozoic, and termitaria possibly absent altogether -
>>> leaving wood-nesting termites as the only common social insect
>>> contemporary with alvarezsaurs.  So there would seem to be slim
>>> pickings indeed for a theropod that relied solely on ants and termites
>>> as its food source.
>>
>> Agreed on the need to eat more than social insects, but it seems to me
>> more likely for they to pick small animals, seeds, or not though
>> plants, than carrion-eating, because of not having recurved beaks or
>> teeth. I think following large herbivores and searching for its
>> droppings may provide many seeds, and perhaps also insects if waiting
>> a time.
>>
>