The Cape Fear River basin is located along the southeastern Atlantic Slope and is the largest river basin located within North Carolina. Historically, the ictalurid assemblage was characterized by five species of bullhead Ameiurus spp. and three species of madtom Noturus spp. Channel Catfish Ictalurus punctatus were introduced in the early 20th century, followed by Flathead Catfish Pylodictis olivaris in 1965 and Blue Catfish Ictalurus furcatus in 1966. Long-term analysis of the ictalurid assemblage has been confounded by disparate data sets in both electronic and historical paper-based document archives. The goal of this study was to merge contemporary and legacy agency data sets to elucidate spatial and temporal trends in the ictalurid assemblage of the Cape Fear River basin. Rotenone surveys conducted in the 1960s documented abundant madtoms and White Catfish Ameiurus catus throughout the basin. Native species comprised the majority of the ictalurid assemblage through the early 1990s. Since 1990, Blue and Flathead catfish have been the dominant species observed. The largest native ictalurid, the White Catfish, has not been collected since 2008. Nonmetric multidimensional scaling suggests that native ictalurids were more prevalent in small tributaries with increasing distance from the initial adult Flathead Catfish stocking location. Despite the widespread distribution and abundance of nonnative ictalurids, several native species are still found in small tributaries in upstream watersheds. The North Carolina Catfish Management Plan prioritizes the conservation of native ictalurids in the state's Atlantic Slope rivers; however, some species may already be extirpated.

中文翻译：

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探索遗留数据集以推断大西洋斜坡河 Ictalurid 组合的时空趋势

开普菲尔河流域位于大西洋东南部斜坡，是北卡罗来纳州最大的河流流域。从历史上看，ictalurid 组合的特征是五种牛头Ameiurus spp。和三种 madtom Noturus spp。20 世纪初引入了沟鲶Ictalurus punctatus，1965 年引入了平头鲶鱼Pylodictis olivaris和蓝鲶鱼Ictalurus furcatus1966 年。对 ictalurid 组合的长期分析被电子和历史纸质文档档案中的不同数据集混淆了。本研究的目标是合并当代和遗留机构数据集，以阐明开普菲尔河流域 ictalurid 组合的空间和时间趋势。1960 年代进行的鱼藤酮调查记录了大量的 madtoms 和白鲶鱼Ameiurus catus整个盆地。到 1990 年代初期，本地物种占 ictalurid 组合的大部分。自 1990 年以来，蓝鲶和扁头鲶一直是观察到的优势物种。最大的原生 ictalurid，白鲶鱼，自 2008 年以来一直没有被收集。非度量多维标度表明，本地 ictalurids 在小支流中更普遍，与最初的成年扁头鲶鱼放养地点的距离增加。尽管非本地 ictalurids 分布广泛且数量众多，但在上游流域的小支流中仍然发现了几种本地物种。北卡罗来纳州鲶鱼管理计划优先保护该州大西洋坡河流中的本地鲇鱼；然而，有些物种可能已经灭绝。