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Is there a role for vision in the behaviour of sea lampreys (Petromyzon marinus) during their upstream spawning migration?

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Abstract:

This study found no evidence to support a role for vision in the behaviour of sea lampreys (Petromyzon marinus) during their spawning migration. Blindness had no affect on the migratory propensity of lampreys, and control and blinded animals moved upstream at the same rate. The diel activity pattern of control and blinded lampreys was identical in both the laboratory and field. Activity was mostly nocturnal, but lampreys in the field did show some daytime activity. Diel activity broke down when lampreys were unable to locate suitable daytime refuge, but blindness did not affect the willingness or ability of lampreys to do so in either the laboratory or field. Laboratory studies indicate that light avoidance is mediated by dermal photoreceptors located in the tail, but the data suggests that refuge sites are sought out before sunrise using tactile and possibly hydraulic cues. Thus, light-induced searching only occurs when the sites chosen at night do not provide adequate concealment after sunrise.

Notre étude ne trouve aucune indication qui appuie le rôle de la vision dans le comportement des grandes lamproies marines (Petromyzon marinus) durant leur migration de fraye. La cécité reste sans effet sur la propension à la migration chez les lamproies et les animaux témoins et aveuglés se déplacent vers l’amont à la même vitesse. Les patrons d’activité journalière des lamproies témoins et aveugles sont identiques, tant en laboratoire qu’en nature. L’activité est surtout nocturne, bien que les lamproies en nature soient partiellement actives le jour. L’activité diurne cesse lorsque les lamproies ne réussissent pas à trouver un refuge adéquat durant le jour, mais la cécité n’affecte ni la volonté, ni la capacité de demeurer en activité, tant au laboratoire qu’en nature. Nos études de laboratoire indiquent que l’évitement de la lumière se fait par l’intermédiaire de récepteurs dermiques situés dans la queue, mais nos données laissent croire que les lamproies recherchent les sites de refuge avant le lever du soleil à l’aide de signaux tactiles et peut-être hydrauliques. Ainsi, la recherche induite par la lumière n’a lieu que lorsque les sites choisis durant la nuit ne permettent pas une dissimulation suffisante après le lever du soleil.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2007-10-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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