spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

First published online January 17, 2007
Journal of Experimental Biology 210, 447-453 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.02658
This Article
Right arrow Summary Freely available
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Jordão, J. M.
Right arrow Articles by Oliveira, R. F.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Jordão, J. M.
Right arrow Articles by Oliveira, R. F.

Spectral sensitivity of four species of fiddler crabs (Uca pugnax, Uca pugilator, Uca vomeris and Uca tangeri) measured by in situ microspectrophotometry

Joana M. Jordão1,*, Thomas W. Cronin2 and Rui F. Oliveira1

1 Unidade de Investigação em Eco-Etologia, ISPA, Rua Jardim do Tabaco, 34, 1149-041 Lisboa, Portugal
2 Department of Biological Sciences, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 USA


Figure 1
View larger version (132K):
[in this window]
[in a new window]

  		Fig. 1. Photographs of sectioned photoreceptors and lateral screening pigments from four species of fiddler crabs, of genus Uca, as viewed in the microspectrophotometer. In each panel, the elongated rectangular or oval-shaped structures are rhabdoms, sectioned obliquely and viewed laterally, surrounded by droplets or granules of screening pigments. Absorption spectra of these screening pigments are plotted in Fig. 4B. Scale bar, 10 µm (applies to all panels).

 

Figure 2
View larger version (10K):
[in this window]
[in a new window]

  		Fig. 2. Difference spectrum for photobleaching obtained from a single rhabdom from U. tangeri (jagged curve). The smooth curve represents the best-fit template (Stavenga et al., 1993Go), with {lambda}max of 527 nm. In this example, the data are normalized to 0.011 optical density units (the average maximum difference at 527±2 nm).

 

Figure 3
View larger version (24K):
[in this window]
[in a new window]

  		Fig. 3. Normalized average absorbance change in main rhabdoms of all four study species. In each panel, the smooth curve is the template (Stavenga et al., 1993Go) that is fitted to the data.

 

Figure 4
View larger version (9K):
[in this window]
[in a new window]

  		Fig. 4. Absorption spectra of photostable pigments in the eyes of the four Uca species. Each curve is a single normalized scan. (A) Representative spectra from ommochrome granules. (B) Representative spectra from rhabdomal lateral screening pigments.

 

Figure 5
View larger version (7K):
[in this window]
[in a new window]

  		Fig. 5. Normalized spectral sensitivities in all four study species of Uca, computed as described in the text.

 




© The Company of Biologists Ltd 2007