Assessing morphological differences in an adaptive trait: A landmark-based morphometric approach
Assessing morphological differences in an adaptive trait: A landmark-based morphometric approach
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DOI：
10.1002/jez.1020
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发表时间：
2001-05-01
影响因子：
--
通讯作者：
Kocher, TD
中科院分区：
文献类型：
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作者：
Albertson, RC;Kocher, TD
东非慈鲷鱼已经进化出一系列令人惊叹的口颌形态。为了更好地了解这种特征的适应性进化，我们对马拉维湖两个密切相关的物种的颌骨进行了形态学分析，这两个物种具有非常不同的进食模式。燃料氏营养鱼沿着基质以“咬”的方式觅食，而斑马尺蛾则以“吸”的方式在水体中觅食。我们分析了构成口颌的四个骨骼要素：齿骨、关节、前颌骨和上颌骨。此外，我们对脑颅进行了同样的分析，脑颅是与口颌密切相关的一个元素。我们使用薄板样条方法来量化形态差异，这使我们能够将我们的结果与物种的功能生物学联系起来。我们发现许多方面的形状变化，直接关系到的慈鲷头部的功能设计。对Labeotropheus和Metriaclima之间的杂交进行了相同的测量。对于每一个字符，杂种后代是统计学上不同于两个亲本物种。这些结果表明，负责这些表型的等位基因的加性作用模式。J. Exp. Zool.289：385-403，2001. (C)2001 Wiley-Liss，Inc.
East African cichlid fishes have evolved a stunning array of oral jaw morphologies. To better understand the adaptive evolution of this trait, we performed a morphological analysis of the jaws of two closely related species from Lake Malawi that have very different modes of feeding. Labeotropheus fuelleborni forages along the substrate with a "biting" mode of feeding, while Metriaclima zebra feeds in the water column with a "sucking" mode. We analyzed each of the four skeletal elements that make up the oral jaws: the dentary, articular, premaxilla, and maxilla. In addition, we performed the same analysis on the neurocranium, an element closely associated with the oral jaws. We used the thin-plate spline method to quantify morphological differences, which allowed us to relate our results to the functional biology of the species. We find many aspects of shape change that relate directly to the functional design of the cichlid head. The same series of measurements was made on hybrids between Labeotropheus and Metriaclima. For every character, hybrid progeny are statistically different from both parental species. These results suggest an additive mode of action of the alleles responsible for these phenotypes. J. Exp. Zool. 289:385-403, 2001. (C) 2001 Wiley-Liss, Inc.