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首页> 外文期刊>Michigan Academician >Changes in Fish Assemblages in Michigan Lakes since the 1950s
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Changes in Fish Assemblages in Michigan Lakes since the 1950s

机译：自1950年代以来密歇根湖鱼群的变化

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摘要

A comparison was made of the species of fishes found in 35 lakes in the Lower Peninsula of Michigan sampled in the 1950s with duplicate samples taken in 2003-2004. These lakes have been subjected to many perturbations in the past 50 years. Increased habitation on most lakes and recreational boating contributing to physical and biological changes have been noted, but not quantified. Stocking of fishes not native to the lake, treatment for control of aquatic plants, and some fish eradication practices have been recorded on many of the lakes. For all fishes in combined lakes, the Sorenson's index of similarity was 0.90. The mean index for individual lakes was 0.67. The mean number of species found in the lakes in the 1950s sample was 13.3 and in the present sample 11.8. The median number of species in the past was significantly greater than that in the present. Mean seining effort was greater in the present sample (121.7 minutes) than in the past (87-1 minutes) which suggests some species may be less abundant or less widely distributed now than 50 years ago. A plot of the frequency of occurrence of fishes for the 35 lakes, present against past, suggests (more than 50% change) the golden shiner, lake chubsucker, yellow bullhead, and grass pickerel are less common now, and the spotfin shiner and warmouth are more common. For the 35 lakes considered, the assemblages of fishes have changed little. Although the abundance of many populations appears to be reduced, the species involved appear to be resilient.
机译：比较了1950年代在密歇根州下半岛的35个湖泊中发现的鱼类种类，并在2003-2004年间进行了重复取样。在过去的50年中，这些湖泊遭受了许多干扰。人们注意到，大多数湖泊上的栖息地增加和休闲划船会导致物理和生物变化，但尚未量化。许多湖泊都记录了非湖泊鱼类的放养，控制水生植物的处理方法以及一些鱼类消灭习俗的记录。对于合并湖泊中的所有鱼类，索伦森相似度指数均为0.90。各个湖泊的平均指数为0.67。在1950年代的湖泊中发现的平均物种数为13.3，而在目前的样本中为11.8。过去物种的中位数明显大于现在。当前样品（121.7分钟）的平均围网努力比过去（87-1分钟）要大，这表明与50年前相比，现在某些物种的数量可能较少或分布较广。对过去的35个湖泊的鱼类出现频率作图，表明（超过50％的变化）现在，金黄色的日光浴，楚布克湖，黄色的牛头犬和草pick鱼已经不那么普遍了，点鳍的日光浴和华茅斯更常见。对于所考虑的35个湖泊，鱼类种类变化不大。尽管许多种群的数量似乎减少了，但所涉物种似乎具有复原力。

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  • 来源
    《Michigan Academician》 |2007年第3期|p.3-18|共16页
  • 作者

    W. C. LATTA;

  • 作者单位

    Institute for Fisheries Research, Michigan Department of Natural Resources;

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