caa a22 4500 477115845 CHVBK 20180405111622.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00005213 doi (NATIONALLICENCE)springer-10.1007/BF00005213 Visual constraints on migration behavior of juvenile French grunts [Elektronische Daten] [William McFarland, Christina Wahl] Synopsis: Retinomotor movements of three size classes of juvenile French grunts, Haemulon flavolineatum, are characterized during the periods of their daily evening and dawn migration. Differences in the extension and withdrawal of the cones correlate with the earlier departure and later return to the daytime schooling sites of the smallest juveniles as compared to the larger juveniles. For each size class changes in the dimensions and retinal distribution of the cone cells and optical properties of the eye are used to estimate differences in photosensitivity under conditions of equal radiant intensities. For a target subtending any given angle, calculation indicates that the largest juveniles should be capable of discrimination at one-thousandth the light intensity of the smallest juveniles. The differences in potential photosensitivity correlate with the different intensities at which they migrate. The likely trigger to initiate their daily migrations probably involves circadian factors at dawn and extension of the single cones from the focal region of the retina prior to the evening migration. Kluwer Academic Publishers, 1996 Retina nationallicence Fish nationallicence Behavior nationallicence Development nationallicence Haemulon flavolineatum nationallicence Haemulidae nationallicence McFarland William Friday Harbor Marine Laboratory, 620 University Road, 98250, Friday Harbor, WA, U.S.A. aut Wahl Christina Department of Anatomy, Cornell University, 14853, Ithaca, NY, U.S.A. aut Environmental Biology of Fishes Kluwer Academic Publishers 46/2(1996-06-01), 109-122 0378-1909 46:2<109 1996 46 10641 https://doi.org/10.1007/BF00005213 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005213 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McFarland William Friday Harbor Marine Laboratory, 620 University Road, 98250, Friday Harbor, WA, U.S.A aut NATIONALLICENCE 700 1- Wahl Christina Department of Anatomy, Cornell University, 14853, Ithaca, NY, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 46/2(1996-06-01), 109-122 0378-1909 46:2<109 1996 46 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer