Eye color as an indicator of social rank in the fish Nile tilapia.
Eye color as an indicator of social rank in the fish Nile tilapia.
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眼睛颜色是尼罗罗非鱼社会地位的指标。
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
G. C. Ramanzini
中科院分区：
文献类型：
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作者：
G. L. Volpato;A. Luchiari;C. Duarte;R. E. Barreto;G. C. Ramanzini
我们研究了尼罗罗非鱼（Oreochromis niloticus）眼睛颜色与显性-从属关系的关系。眼睛颜色模式也被检查与攻击强度的关系。我们配对20个大小匹配的鱼（入侵者：73.69 - 11.49克;居民：75.42 - 8.83克），并评估眼睛的颜色和战斗。将这些鱼在单独的水族箱中隔离10天，然后在配对前5分钟测量它们的眼睛颜色（基础值）。配对后20分钟，眼睛的颜色和战斗进行了量化10分钟。明确建立社会阶层，观察到7对10对鱼。攻击次数从1到168不等。计算这些数据的四分位数，然后将这些对分为两类：低发作（1至111次发作- 2个较低的四分位数）或高发作（112至168次发作- 2个较高的四分位数）。优势减少配对后的鱼的眼睛变暗模式，而从属性增加变暗相比，优势。下级鱼在低攻击对抗提出了一个黑暗的眼睛相比，占主导地位的鱼类和基础条件。我们还观察到一个苍白的眼模式，占主导地位的人，分享低攻击的相互作用后，配对相比，下属和组内。然而，我们没有发现高攻击组的优势和下属之间的暗化模式的差异。我们的结论是，眼睛的颜色与社会等级在这个物种。此外，在低攻击对中，眼睛颜色和社会等级之间的关联可能起到减少攻击的作用。
We investigated the association of eye color with the dominant-subordinate relationship in the fish Nile tilapia, Oreochromis niloticus. Eye color pattern was also examined in relation to the intensity of attacks. We paired 20 size-matched fish (intruder: 73.69 11.49 g; resident: 75.42 8.83 g) and evaluated eye color and fights. These fish were isolated in individual aquaria for 10 days and then their eye color was measured 5 min before pairing (basal values). Twenty minutes after pairing, eye color and fights were quantified for 10 min. Clear establishment of social hierarchy was observed in 7 of 10 pairs of fish. Number of attacks ranged from 1 to 168 among pairs. The quartile was calculated for these data and the pairs were then divided into two classes: low-attack (1 to 111 attacks - 2 lower quartiles) or high-attack (112 to 168 attacks - 2 higher quartiles). Dominance decreased the eye-darkening patterns of the fish after pairing, while subordinance increased darkening compared to dominance. Subordinate fish in low-attack confrontations presented a darker eye compared to dominant fish and to the basal condition. We also observed a paler eye pattern in dominants that shared low-attack interactions after pairing compared to the subordinates and within the group. However, we found no differences in the darkening pattern between dominants and subordinates from the high-attack groups. We conclude that eye color is associated with social rank in this species. Moreover, the association between eye color and social rank in the low-attack pairs may function to reduce aggression.