ABSTRACT

This study deals with the impact of zinc on the locomotor activity rhythm of two terrestrial isopods Armadillo officinalis and Chetophiloscia elongata. Specimens are collected from the banks of Ghar El Melh lagoon. The locomotor rhythm of untreated and treated individuals with zinc is studied in the laboratory under constant darkness for 10 days. Results showed that untreated individuals of A. officinalis and C. elongata exhibited nocturnal behavior. After Zn exposure, these species concentrated their locomotor activities more or less in the subjective day. Whatever the species, the locomotor patterns became in majority multimodal for treated individuals. We noted, in addition, the absence of the unimodal profile. Through periodogram analysis, ultradian and circadian components were determined whatever the experimental conditions. The most important rhythmicity was determined in the control individual of A. officinalis (73.7%) as well as of C. elongata (52.6%). Furthermore, the locomotor behavior is less stable for contaminated individuals of the two sympatric species. Moreover, contrary to C. elongata, A. officinalis individuals became significantly more active after their exposure to zinc contaminated litter (α_DD+Zn = 5h03 ± 2h33).

摘要

这项研究涉及锌对两种陆地等足类动物Armadillo officinalis和Chetophiloscia elongata的运动活动节律的影响。标本是从 Ghar El Melh 泻湖岸边收集的。未经治疗和用锌治疗的个体的运动节律在实验室中在持续黑暗的情况下研究 10 天。结果表明，未经处理的A. officinalis和C. elongata个体表现出夜间行为。锌暴露后，这些物种在主观天或多或少地集中了它们的运动活动。无论是什么物种，对于接受治疗的个体来说，运动模式在大多数情况下都是多模式的。此外，我们注意到单峰轮廓的缺失。通过周期图分析，无论实验条件如何，都可以确定超电和昼夜节律成分。在A. officinalis (73.7%) 和C. elongata (52.6%)的对照个体中确定了最重要的节律性。此外，这两种同域物种的受污染个体的运动行为不太稳定。此外，与C. elongata 不同，A. officinalis个体在暴露于锌污染的垃圾后变得更加活跃（α _DD+Zn  = 5h03 ± 2h33）。