New PDF release: In the Light of Evolution: Volume VI: Brain and Behavior

By National Academy of Sciences, Francisco J. Ayala, John C. Avise, Georg F. Striedter

ISBN-10: 0309261759

ISBN-13: 9780309261753

The important objective of the In the sunshine of Evolution (ILE) sequence is to advertise the evolutionary sciences via cutting-edge colloquia--in the sequence of Arthur M. Sackler colloquia backed through the nationwide Academy of Sciences--and their released lawsuits. each one installment explores evolutionary views on a selected organic subject that's scientifically exciting but in addition has unique relevance to modern societal concerns or demanding situations.

This booklet is the outgrowth of the Arthur M. Sackler Colloquium "Brain and Behavior," which used to be backed by means of the nationwide Academy of Sciences on January 20-21, 2012, on the Academy's Arnold and Mabel Beckman heart in Irvine, CA. it's the 6th in a chain of Colloquia lower than the overall identify "In the sunshine of Evolution." particularly, In mild of Evolution: mind and Behavior makes a speciality of the sphere of evolutionary neuroscience that now encompasses a tremendous array of alternative ways, information kinds, and species.

This quantity is additionally that can be purchased with the In the sunshine of Evolution six-volume set.

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Additional info for In the Light of Evolution: Volume VI: Brain and Behavior

Sample text

Do we see a similar functional partitioning of Nav channel types in teleosts? Are those groups with only four Nav channel genes (elasmobranchs, basal actinpoterygian fishes, basal sarcopterygian fishes) hampered in the complexity of their neural processing? Finally, on a microevolutionary level, we see that Nav channels can be targets of adaptive changes for increasing diversity in signaling (electric fish), in the arms race against lethal naturally occurring or synthetic toxins (snakes, newts, pufferfish, insects), and in specialized habitats (naked mole rats).

The enhancement of conduction velocity along with the evolution of jaws likely made early gnathostomes fierce predators and the dominant vertebrates in the ocean. Later in vertebrate evolution, the Nav channel gene family expanded in parallel in tetrapods and teleosts (~9 to 10 genes in amniotes, 8 in teleosts). This expansion occurred during or after the late Devonian extinction, when teleosts and tetrapods each diversified in their respective habitats, and coincided with an increase in the number of telencephalic nuclei in both groups.

The only exceptions are two lineages of weakly electric fishes. These two groups—the South American gymnotiforms and African mormyriforms—evolved electric organs independently. 4a (scn4aa) lost its expression in muscle and became compartmentalized in the electric organ. 4 in mammals is under strong purifying selection because mutations in the gene for this channel often cause muscle paralysis or myotonia. , 2010). The pace of evolutionary change quickened in similar regions of the channel in both groups; in some cases the same or neighboring amino acids changed in both groups.

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In the Light of Evolution: Volume VI: Brain and Behavior by National Academy of Sciences, Francisco J. Ayala, John C. Avise, Georg F. Striedter

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