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Re: Varanus komodoensis feeding
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- Subject: Re: Varanus komodoensis feeding
- From: Jura <email@example.com>
- Date: Thu, 20 Oct 2011 14:54:59 -0700 (PDT)
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Nice! I heard rumblings of this one for a while. Glad to see it is finally out.
"I am impressed by the fact that we know less about many modern [reptile] types
than we do of many fossil groups." - Alfred S. Romer
----- Original Message -----
> From: "Thomas R. Holtz, Jr." <email@example.com>
> To: 'DML List' <firstname.lastname@example.org>
> Sent: Thursday, 20 October 2011 5:41 PM
> Subject: Varanus komodoensis feeding
> D'Amore DC, Moreno K, McHenry CR, Wroe S (2011) The Effects of Biting and
> Pulling on the Forces Generated during Feeding in the
> Komodo Dragon (Varanus komodoensis). PLoS ONE 6(10): e26226.
> In addition to biting, it has been speculated that the forces resulting from
> pulling on food items may also contribute to feeding
> success in carnivorous vertebrates. We present an in vivo analysis of both
> and pulling forces in Varanus komodoensis, the
> Komodo dragon, to determine how they contribute to feeding behavior.
> Observations of cranial modeling and behavior suggest that V.
> komodoensis feeds using bite force supplemented by pulling in the
> caudal/ventrocaudal direction. We tested these observations using
> force gauges/transducers to measure biting and pulling forces. Maximum bite
> force correlates with both body mass and total body
> length, likely due to increased muscle mass. Individuals showed consistent
> behaviors when biting, including the typical
> medial-caudal head rotation. Pull force correlates best with total body
> longer limbs and larger postcranial motions. None of
> these forces correlated well with head dimensions. When pulling, V.
> use neck and limb movements that are associated with
> increased caudal and ventral oriented force. Measured bite force in Varanus
> komodoensis is similar to several previous estimations
> based on 3D models, but is low for its body mass rela
ull force, especially in the ventrocaudal
> direction, would allow individuals to hunt and deflesh with high success
> the need of strong jaw adductors. In future
> studies, pull forces need to be considered for a complete understanding of
> vertebrate carnivore feeding dynamics.
>> From the Conclusions:
> lthough the V. komodoensis behavior model is unique amongst extant taxa, it
> shed light upon the feeding behaviors of extinct
> ziphodont tetrapods, especially theropods , . Supposedly some
> also had relatively low bite forces given their size
> and cranial morphology . As in V. komodoensis, such low bite forces may
> been supplemented by a strong pull and would not
> hinder the animal's ability to modify flesh. Both tooth mark data and
> cranial morphometrics suggest that theropods used caudally
> oriented force during feeding -. Modeled neck musculature implies
> some theropods (i.e. Ceratosaurus and Allosaurus)
> also displayed significant ventroflexion, suggesting the "pulling" or
> "raking" of ziphodont teeth through the use of these
> postcranial muscles .
> Thomas R. Holtz, Jr.
> Email: email@example.com Phone: 301-405-4084
> Office: Centreville 1216
> Senior Lecturer, Vertebrate Paleontology
> Dept. of Geology, University of Maryland
> Fax: 301-314-9661
> Faculty Director, Science & Global Change Program, College Park Scholars
> Fax: 301-314-9843
> Mailing Address: Thomas R. Holtz, Jr.
> Department of Geology
> Building 237, Room 1117
> University of Maryland
> College Park, MD 20742 USA