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Vol. 72, No. 4, 2008
Issue release date: February 2009
Section title: Review
Brain Behav Evol 2008;72:251–261
(DOI:10.1159/000171488)

Turning Loss Into Opportunity: The Key Deletion of an Escape Circuit in Decapod Crustaceans

Faulkes Z.
Department of Biology, The University of Texas-Pan American, Edinburg, Tex., USA

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Article / Publication Details

First-Page Preview
Abstract of Review

Received: 6/14/2007
Accepted: 9/11/2008
Published online: 11/12/2008

Number of Print Pages: 11
Number of Figures: 2
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE

Abstract

Decapod crustacean escape responses are adaptive behaviors whose neural bases are well understood. The escape circuit is composed of giant neurons. Lateral giant interneurons (LGs) respond to posterior stimuli by generating a somersaulting tailflip; medial giant interneurons (MGs) respond to anterior stimuli with a backwards tailflip. Both sets of interneurons connect to giant fast flexor motor neurons (MoGs). Most features of the escape circuit are thought to result from strong selective pressure to respond to stimuli in the shortest possible time. Despite the apparent advantages of the escape circuit, it has been lost in multiple taxa independently. Some losses of the escape circuit may be rare cases of disaptation, where organisms are less well adapted than related species (i.e., those with the escape circuit). The losses of the escape circuit might be key deletions that promoted the radiation of decapod crustaceans by increasing selection pressure for species to evolve new anti-predator strategies and removing constraints against change.


  

Author Contacts

Zen Faulkes
Department of Biology, The University of Texas-Pan American
1201 W. University Drive
Edinburg, TX 78539 (USA)
Tel. +1 956 381 2614, Fax +1 956 381 3657, E-Mail zfaulkes@utpa.edu

  

Article Information

Received: June 14, 2007
Accepted after second revision: September 11, 2008
Returned for revision: July 26, 2007
Published online: November 12, 2008
Number of Print Pages : 11
Number of Figures : 2, Number of Tables : 0, Number of References : 108

  

Publication Details

Brain, Behavior and Evolution

Vol. 72, No. 4, Year 2008 (Cover Date: February 2009)

Journal Editor: Wilczynski W. (Atlanta, Ga.)
ISSN: 0006–8977 (Print), eISSN: 1421–9743 (Online)

For additional information: http://www.karger.com/BBE


Article / Publication Details

First-Page Preview
Abstract of Review

Received: 6/14/2007
Accepted: 9/11/2008
Published online: 11/12/2008

Number of Print Pages: 11
Number of Figures: 2
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE


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