Circadian Structural Changes in the Retina of Lycosa tarentula (Araneae: Lycosidae) |
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Authors: | J Kovoor J Ortega-Escobar A Mu oz-Cuevas |
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Institution: | J. Kovoor ,J. Ortega-Escobar,A. Muñ,oz-Cuevas |
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Abstract: | Daily structural changes of the rhabdoms are described in the four eye types of a lycosid spider submitted to laboratory conditions: LD 12:12 (light on at 08.00, 100 lux). From a study of animals submitted to constant darkness during fourteen days, rhabdom turnover was shown to be circadian. Each type of retina exhibits its own rhythmic turnover of rhabdoms. Anterior-lateral, posterior-median and lateral eyes are mostly diurnal; anterior-median retinae comprise 300 receptors with mainly nocturnal functioning and 150 receptors with mainly diurnal functioning. A correlation was found between rhythms of locomotor activity, other activity, and rhabdom turnover in L. tarentula suggesting that the same pacemaker controls these different rhythms. |
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