Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Anatomical Comparisons of Neural Systems in Sighted Epigean and Troglobitic Crayfish Species

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Journal of Crustacean Biology

Abstract The activity of visual systems is known to affect development of the neural tissue associated with vision in both vertebrates and invertebrates. Three species of crayfish were compared for variations in the gross structures of the eye and of the underlying neural tissue of the optic system that were associated with environmental adaptation. The troglobitic crayfish Orconectes australis packardi and two epigean crayfish, Cambarus tenebrosus and Procambarus clarkii, were used. Cambarus tenebrosus raised in the cave are functionally blind although ommatidia develop, indicating that the primary sensory structures still develop without normal input. Troglobitic crayfish have lost the genomic ability to form a functional visual system. Electrophysiological records from neurons within the optic stalk of O. australis packardi showed no response to light. The neuronal ganglia within the eye stalk of C. tenebrosus are disorganized which could be the reason for the lack of a behavioral response related to sight. Second order neurons associated with olfaction arise in the central brain and send processes to lobula within the eye stalk via the protocerebral tract. Cross sections of this tract revealed that the troglobitic crayfish have more olfactory projection neurons and fewer large axon profiles than the other two crayfish, suggesting that O. australis packardi has more neural processing devoted to olfaction as an adaptation to cave life.

Affiliations: 1: a Thomas Hunt Morgan School of Biological Sciences, Center for Ecology, Evolution, and Behavior, University of Kentucky, Lexington, Kentucky 40506-0225, U.S.A. ; 2: b Department of Geography, University of Kentucky, Lexington, Kentucky 40506-0225, U.S.A.

Loading

Full text loading...

/content/journals/10.1163/20021975-99990136
Loading

Data & Media loading...

http://brill.metastore.ingenta.com/content/journals/10.1163/20021975-99990136
Loading

Article metrics loading...

/content/journals/10.1163/20021975-99990136
2001-01-01
2016-12-09

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
     
    Journal of Crustacean Biology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation