FAS Abstracts 2004 Meeting Page

Biological Sciences (BIO C): BIO-27

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Spectral shift in phototaxis through ontogeny of the caridean shrimp Lysmata wurdmanni. A. RHYNE (1), E. AURELLADO (1), T. HEERBRANDT (1), and K.B. JOHNSON (2). (1) Biology Department, Florida Institute of Technology, Melboourne, FL 32901, (2) Department of Marine and Environmental Systems, Florida Institute of Technology, Melbourne, FL 32901. We subjected larvae of the Peppermint shrimp Lysmata wurdmanni to a range of light spectra and intensities to examine their response to light.  Larvae were less sensitive to light than some other decapods, typically requiring a light intensity of ³ 10¹⁴ photons m^-2 s^-1 to elicit a response. L. wurdmanni showed a spectral shift from 480 to 520 nm through ontogeny, a new ontogenetic pattern of spectral preference.  L. wurdmanni larvae are virtually unknown from field collections and phototactic patterns may suggest locations (i.e., expected depths and water quality) of naturally occurring larvae.