Multiple spectral channels in branchiopods. II. Role in light-dependent behavior and natural light environments
AffiliationUniv Arizona, Dept Neurosci
MetadataShow full item record
PublisherCOMPANY BIOLOGISTS LTD
CitationJournal of Experimental Biology (2018) 221, jeb165878. doi:10.1242/jeb.165878
JournalJOURNAL OF EXPERIMENTAL BIOLOGY
Rights© 2018. Published by The Company of Biologists Ltd.
Collection InformationThis 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 firstname.lastname@example.org.
AbstractLight 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.
Note12 month embargo; published online: 22 May 2018
VersionFinal published version
SponsorsNational Science Foundation Graduate Research Fellowship [DGE-0802261]; National Institutes of Health IRACDA PERT fellowship [K12 GM000708]; University of Delaware Research Foundation [12A00755]
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