Download e-book for kindle: Avian Evolution: The Fossil Record of Birds and its by Gerald Mayr

By Gerald Mayr

ISBN-10: 1119020727

ISBN-13: 9781119020721

Wisdom of the evolutionary heritage of birds has a lot superior in contemporary many years. Fossils from severe time classes are being defined at extraordinary premiums and smooth phylogenetic analyses have supplied a framework for the interrelationships of the extant teams. This publication supplies an outline of the avian fossil list and its paleobiological importance, and it's the in simple terms updated textbook that covers either Mesozoic and extra modern-type Cenozoic birds in a few element. The reader is brought to key gains of basal avians and the morphological variations that experience happened within the evolution in the direction of glossy birds. An account of the Cenozoic fossil list sheds gentle at the biogeographic historical past of the extant avian teams and discusses fossils within the context of present phylogenetic hypotheses. This evaluation of the evolutionary heritage of birds not just addresses scholars and confirmed researchers, however it can also be an invaluable resource of knowledge for a person else with an curiosity within the evolution of birds and a average historical past in biology and geology.

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Sexual selection or signaling may therefore have played a role in the evolution of some unusual integumentary structures of Mesozoic theropods, such as the elongated “ribbon-like” feathers of scansoriopterygids (Zhang et al. 2008a; Xu et al. 2009c). However, as yet no selective advantage has been identified that would lead to a pennaceous feather with its complex interlocking system of barbs and barbules just for display or signaling reasons. A coherent vane increases the feather surface available for signaling (Koschowitz et al.

Prum et al. 1998). These effects can involve melanosome layers, but because usually neither color pigments nor keratin are preserved in fossil feathers, color reconstructions based on the melanosomes alone may not always accurately reflect the original color spectrum. Surprisingly often, these analyses result in the assumption of black feathers, as in the cases of Archaeopteryx (Carney et al. 2012) and Microraptor (Li et al. 2012). At least among extant birds, a black plumage is, however, not very common and current color reconstructions may be all too simplistic (McNamara et al.

The trunk-climbing hypothesis was supported with the shape of the large forelimb claws, which are preserved with their horny sheaths in most specimens. The curvature of both the manual and pedal claws of Archaeopteryx does indeed correspond with that of the foot claws of extant arboreal birds and mammals (Feduccia 1993), but similar claw geometries are found in various non-arboreal birds (Wellnhofer 2009). The morphology of the hindlimb skeleton of Archaeopteryx does not indicate climbing habits (Wellnhofer 2009), and most likely it was neither a cursorial nor a strictly arboreal animal.

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Avian Evolution: The Fossil Record of Birds and its Paleobiological Significance by Gerald Mayr

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