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首页> 外文期刊>Environmental toxicology and chemistry >ELEVATED FLUCTUATING ASYMMETRY IN EASTERN MOSQUITOFISH (GAMBUSIA HOLBROOKI) FROM A RIVER RECEIVING PAPER MILL EFFLUENT
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ELEVATED FLUCTUATING ASYMMETRY IN EASTERN MOSQUITOFISH (GAMBUSIA HOLBROOKI) FROM A RIVER RECEIVING PAPER MILL EFFLUENT

机译：接受纸厂废水的东部蚊子（GAMBUSIA HOLBROOKI）中的波动不对称

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摘要

The present study investigated whether fluctuating asymmetry can serve as a useful biomarker of environmental stress in the eastern mosquitofish (Gambusia holbrooki). Fluctuating asymmetry was measured in sexually mature females sampled from two Florida, USA, coastal streams: The Fenholloway River, which is dominated by effluent from a paper mill, and Spring Creek, a tributary to the Fenholloway River (Taylor County, FL, USA) that does not receive paper mill effluent. Nine morphometric (lengths of the A and B scales, fifth pectoral fin ray, supraorbital canal, and preorbital canal and the sixth gill raker on the first brachial arch; orbit diameter; distance from the dorsal—ventral midpoint of the eye socket to the base of the pectoral fin; and distance from the postorbital canal to the operculum) and five meristic traits (numbers of scales in the lateral line, radii on the A and B scales, pectoral fin rays, and gill rakers on the first brachial arch) were included. For each of the three indexes of fluctuating asymmetry that were used, the majority of the traits showed a higher level of fluctuating asymmetry in fish from the Fenholloway River than in fish from Spring Creek. For two of the indexes, the difference was significant. Comparisons of mean values for fluctuating asymmetry (over all traits) for each fish and the means of a composite index of asymmetry both indicated that fish from the Fenholloway River had significantly greater overall fluctuating asymmetry than those from Spring Creek. Results of the present study are consistent with the hypothesis that environmental stress increased the level of fluctuating asymmetry in fish from the Fenholloway River. Thus, fluctuating asymmetry appears to be a useful biomarker for stress-induced developmental instability in the eastern mosquitofish.
机译：本研究调查了波动的不对称性是否可以作为东部蚊子（Gambusia holbrooki）环境压力的有用生物标记。在来自美国佛罗里达州的两个沿海河流的性成熟雌性身上测量了波动的不对称性：以造纸厂的废水为主的芬霍洛威河和芬霍洛韦河的支流Spring Creek（美国佛罗里达州泰勒县）不会接收造纸厂的废水。九个形态计量学（A和B鳞片的长度，第五个胸鳍鳍射线，眶上管和眶前管以及第一个肱骨弓上的第六个ra骨耙；轨道直径；从背－眼窝的腹中点到基底的距离胸鳍的大小；以及从眶后管到腹膜的距离）和五个优点特征（侧线的鳞片数量，A和B鳞片的半径，胸鳍射线和第一臂弓上的g耙）包括在内。对于所使用的三个波动不对称指数中的每一个，与从Spring Creek来的鱼类相比，芬哈洛威河鱼类的大多数性状表现出较高的波动不对称性。对于两个指标，差异是显着的。比较每条鱼的波动不对称平均值（所有性状）和复合不对称指数的均值均表明，芬霍洛韦河的鱼类总体波动不对称性明显高于普林溪的鱼类。本研究的结果与以下假设相符：环境压力增加了芬霍洛威河鱼类的波动不对称性。因此，波动的不对称性似乎是东部蚊鱼中由压力引起的发育不稳定性的有用生物标记。

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