A morphological study on species of African Mormyrus (Teleostei: Mormyridae) and their electric organ discharges
A morphological study on species of African Mormyrus (Teleostei: Mormyridae) and their electric organ discharges
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DOI：
10.2989/16085914.2012.745806
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发表时间：
2013-01-01
影响因子：
1.4
通讯作者：
Kramer, B.
中科院分区：
文献类型：
--
作者：
Kramer, B.
对5种长颌鱼属（Mormyrus Linne 1758）进行了形态学比较，并记录了它们的电器官放电。主成分分析和判别分析结果表明，这5种植物在形态学上有很好的区分，其中同域的M。rume Valenciennes 1846和M. subundulatus Roberts 1989非常接近但彼此不同。数据集中的一半变化仅由PC 1捕获，主要由尾柄深度和长度、臀鳍长度、吻长、前肛长和背鳍鳍条计数和长度依次加载。异区分布的M. lacerda Castelnau 1861来自赞比西河上游/宽多河流域和纳米比亚库内内河流域，表现出与M.来自班达马河和科莫埃河的样本进行了比较，两者都在科特迪瓦。在M的单极脉冲中，标准化到25 ℃的EOD的平均持续时间从362 μ s变化。tenuirostris Peters 1882在肯尼亚采样，在M. lacerda，波形也显示了所有其他长颌鱼物种。M. hasselquistii Valenciennes 1846是如此强大的鱼是痛苦的处理。M.雌、雄鼠的平均生殖力分别为1334 μ s（SE 106）和2008 μ s（SE 195）。
Five species of Mormyrus Linne 1758, three from West Africa and one each from East and southern Africa, were compared morphologically, and their electric organ discharges (EODs) recorded in the field. The five species were morphologically well differentiated in terms of principal components analysis and discriminant analysis, with syntopical M. rume Valenciennes 1846 and M. subundulatus Roberts 1989 very close to but distinct from one another. Half the variation in the dataset was captured by PC1 alone, being mainly loaded by caudal peduncle depth and length, anal fin length, length of snout, pre-anal length, and dorsal fin ray count and length, in that order. Allopatric samples of M. lacerda Castelnau 1861 from the Upper Zambezi/Kwando system and Cunene River, Namibia, showed some differentiation regarded as infrasubspecific, similar to that of the M. rume samples from the Bandama River compared to those of the Comoe River, both in Cote divoire. The EODs, normalised to 25 degrees C, varied in average duration from 362 mu s in the monopolar pulses of M. tenuirostris Peters 1882 sampled in Kenya, to 6 675 mu s in the biphasic waveform pulses of M. lacerda, the waveform also displayed by all other Mormyrus species. The EOD of M. hasselquistii Valenciennes 1846 was so strong the fish was painful to handle. The EOD pulse duration of M. rume differed significantly between the sexes, being on average 1 334 mu s (SE 106) in females and 2 008 mu s (SE 195) in males.