Multiple spectral channels in branchiopods. II. Role in light-dependent behavior and natural light environments
Publisher
COMPANY BIOLOGISTS LTDCitation
Journal of Experimental Biology (2018) 221, jeb165878. doi:10.1242/jeb.165878Journal
JOURNAL OF EXPERIMENTAL BIOLOGYRights
© 2018. Published by The Company of Biologists Ltd.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Light is a primary environmental factor used by aquatic invertebrates for depth selection behavior. Many branchiopod crustaceans live in ephemeral aquatic habitats. All branchiopod crustaceans studied to date express four or more visual opsins in their compound eyes. We asked whether two branchiopods, Triops longicaudatus and Streptocephalus mackini, use multiple spectral channels to regulate their position in the water column. At the lowest intensities that elicited photonegative behavior, both species had broad spectral bandwidths, suggesting they use multiple spectral photoreceptor classes. Male S. mackini were more likely to maintain a vertical position 8.0-12.0 cm below the surface than females, independently of whether females were present. Male photopositive behavior at low intensity was restricted to a narrow bandwidth centered at 532 nm, suggesting a single photoreceptor class is used to maintain position above females. We compared ephemeral pools from two regions in Arizona and found that diffuse light attenuation coefficients were two orders of magnitude greater than the most heavily attenuating coastal waters. At less than 1 m of depth, pools were often dimmer than terrestrial habitats under starlight. Soil particle size distribution in each region affected spectral light environments, and behavioral responses of field-caught shrimp were adapted to the spectral properties of their region. The results suggest that branchiopods predominantly use luminance vision summed from multiple spectral photoreceptor classes for depth selection in dim, spectrally variable environments. The neuroanatomical basis for summation is described in a companion paper.Note
12 month embargo; published online: 22 May 2018ISSN
0022-09491477-9145
PubMed ID
29622667Version
Final published versionSponsors
National Science Foundation Graduate Research Fellowship [DGE-0802261]; National Institutes of Health IRACDA PERT fellowship [K12 GM000708]; University of Delaware Research Foundation [12A00755]Additional Links
http://jeb.biologists.org/lookup/doi/10.1242/jeb.165878ae974a485f413a2113503eed53cd6c53
10.1242/jeb.165878
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