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Re: [dinosaur] Spinosaurus controversies + tiny theropod arms + marching dinosaurs to scale + more
On Fri, 4/1/16, Ben Creisler <firstname.lastname@example.org> wrote:
Spinosaurus Controversies and mysteries
Breath-hold time (BHT) is proportional to bodymass -- given their size,
spinosaurids could have exceeded the BHT's of modern crocs and turtles. It
follows that a head-down paddling/wading/swimming posture would not be
presumably maladaptive in a massive, carnivorous shallow-water forager (or an
herbivorous one, for that matter).
Further -- sails are unlikely to be functional as heat collectors, but are
practical as heat dumpers -- eg, cold-adapted mammoths have small, insulated
ears (retaining heat), while African Elephants have large, hairless fans with
adaptations to increase and decrease blood-flow (bio-radiators).
Given a warm, deltaic habitat filled with large prey and predators, the
reconstruction of Sereno and company seems quite reasonable from an ecological
perspective, if one takes a largish standard theropod as ancestral...