Field observations of the different physiological colour patterns (PCPs) of juvenile bullethead parrotfish, Chlorurus sordiduswere conducted at three sites around Lizard Island, Australia. The aim of the study was to quantify, using log-linear analysis, the influence of simultaneously interacting variables upon the PCPs shown by this species in the field. It was proposed that features of an individual, such as body size (total length) and schooling behaviour (schooling/not schooling), as well as foraging activity (feeding/not feeding), were influential in PCP determination. In addition, the influence of time of day was considered. Overall, an individual's body size was the most significant factor, being over six times more important than foraging activity in determining the PCP displayed. The schooling behaviour of an individual was 40% more important than foraging activity in PCP determination. Furthermore, the correlation between body size and PCP was itself dependent on time of day whilst both foraging activity and schooling behaviour were independent of time of day. The systematic methodology used enabled interactions between variables to be ranked numerically and their biological significance to be discussed. The results present correlational evidence that PCPs may function for anti-predator purposes and provide the basis for future studies into the function of PCPs in juvenile C. sordidus

译文

在澳大利亚蜥蜴岛周围的三个地点进行了对幼年子弹头鹦嘴鱼Chlorurus sordidus的不同生理颜色图案(PCP)的现场观察。该研究的目的是使用对数线性分析来量化同时相互作用的变量对该物种在野外显示的五氯苯酚的影响。有人提出,个人特征,例如身材(总长)和上学行为(上学/不上学)以及觅食活动(进食/不进食),对五氯苯酚的测定有影响。另外,考虑了一天中时间的影响。总体而言,个人的身材是最重要的因素,在确定所显示的PCP方面比觅食活动重要六倍以上。在确定PCP方面,个人的学习行为比觅食活动重要40%。此外,体型与PCP之间的相关性本身取决于一天中的时间,而觅食活动和学习行为均与一天中的时间无关。使用的系统方法论使变量之间的相互作用能够进行数值排名,并对其生物学意义进行讨论。结果提供了相关证据,证明五氯苯酚可能起到反捕食目的,并为今后研究幼小梭状芽胞杆菌的五氯苯酚的功能提供了依据。

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