Cookies Policy

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


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 Visually directed movements of juveniles of the mangrove crabs Aratus pisonii and Chlorodiella longimana and postlarvae (megalopae) of A. pisonii to black horizontal rectangles subtending visual angles from 5-350° were measured in a circular arena. The study tested the hypothesis that early stage crabs use visual cues for attraction to potential refuge sites represented by silhouettes of mangrove roots and for avoidance of large dark areas that represent predators. The habitats of the 2 species differ in that A. pisonii lives in the supralittoral/littoral area among the roots and branches of mangrove forests, while C. longimana lives sublittorally in this area and is rarely exposed to air. Megalopae and juveniles of A. pisonii were significantly attracted by relatively narrow rectangles subtending angles up to 30°. In contrast, juvenile C. longimana exhibited attraction to all dark sectors, except a 5° dark rectangle. Orientation away from large dark rectangles subtending angles of 90-350° was exhibited only by A. pisonii. These different responses are interpreted to reflect the demands for shelter and predator avoidance in the habitat of each species. Chlorodiella longimana responded to all dark objects as if they were refuge sites, while A. pisonii differentiated between refuge and predators on the basis of horizontal extent.


Full text loading...


Data & Media loading...

Article metrics loading...



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