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Northern Pike (esox Lucius) Population Characteristics And Relations To Recruitment In Hackberry Lake, Nebraska

机译:内布拉斯加州哈克贝里湖北部派克(esox Lucius)人口特征及其与招聘的关系

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Knowledge of the population structure of northern pike (Esox lucius), an important recreational and top-level piscivore, is essential to Nebraska Sandhill lakes management. We collected a sample of adult northern pike from Hackberry Lake in June and July of 2004. Proportional stock density (PSD) was 98 (95% CI = ± 3) and relative stock density of preferred-length fish (RSD-P) was 40 (95% CI = ± 9). Northern pike were aged using sagittal otoliths, and fish from the 1993 to the 2002 year classes were present in our population sample. Age-frequency histograms revealed relatively consistent recruitment of northern pike, as no missing year classes were detected, but year-class strength was variable among years. Examination of mean length at age suggested that growth was rapid in the first two years and slowed thereafter but was faster than populations in other locations, perhaps because this population is near the edge of the geographical range for this species. Year-class strength of northern pike was negatively related to spring wind speed and was curvilinearly related to spring air temperature. The strongest year classes occurred in years with relatively moderate air temperatures and lower wind speeds. This research provided useful information regarding northern pike population characteristics and recruitment in one Sandhill lake.
机译:了解北部梭子鱼(Esox lucius)的种群结构是重要的娱乐和顶级食肉动物,对内布拉斯加州桑德希尔湖的管理至关重要。我们于2004年6月和7月收集了朴树湖成年北部梭子鱼的一个样本。比例种群密度(PSD)为98(95%CI =±3),优选长度鱼的相对种群密度(RSD-P)为40 (95%CI =±9)。北部派克鱼使用矢状耳石进行陈化,并且从1993年到2002年的鱼类出现在我们的人口样本中。年龄-频率直方图显示北部派克的招募相对一致,因为没有检测到失踪的年级,但是年级强度在几年中是可变的。年龄平均长度的检查表明,在最初的两年中生长迅速,随后开始减慢,但比其他位置的种群快,这可能是因为该种群处于该物种地理范围的边缘。北部梭子鱼的年强度与春季风速呈负相关,与春季气温呈负相关。最强的年级发生在气温相对中等和风速较低的年份。这项研究提供了有关北部山狗种群特征和在一个Sandhill湖中募集的有用信息。

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