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首页> 外文期刊>Belgian Journal of Zoology >Analysis of ontogenetic changes in head shape and diet in a catfish with moderately enlarged jaw adductors (Clariallabes melas)
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Analysis of ontogenetic changes in head shape and diet in a catfish with moderately enlarged jaw adductors (Clariallabes melas)

机译：jaw骨内moderate增大的enlarged鱼头部形状和饮食的个体发育变化分析（Clariallabes melas）

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Jaw adductor hypertrophy,or the presence of enlarged jaw-closing muscles,has arisen several times independently in African clariid catfish.Previous work has demonstrated that species characterized by enlarged jaw adductors may have unusual ways of foraging such as terrestrial foraging and prey capture,and often include a large proportion of hard and terrestrial prey in their diet.However,relatively little is known about species of the genus Clariallabes with an intermediate degree of jaw adductor hypertrophy. In the present study we present data on head shape and diet for a range of sizes of specimens of a poorly known species of Clariallabes,C. melas.Our data show that growth patterns in this species and the previously studied C.longicauda are similar in some ways (e.g.positive allometry of the growth of the jaw muscles) but different in others (negative allometry in hyoid width).However,C.melas has a smaller head for its body size in all dimensions. Due to the large number of empty stomachs we encountered,dietary data remain preliminary,but suggest a varied diet including both hard and soft prey.Our data show that a large amount of variation in head shape may exist even among related species and that species with jaw adductor hypertrophy generally show positive allometry in the growth of the jaw adductors and associated structures.Whether jaw muscle hypertrophy is an adaptive trait in clariid catfish awaits further comparative analyses testing for the evolutionary association between jaw adductor hypertrophy and the inclusion of hard prey into the diet.
机译：下颌内收肌肥大或下颌闭合肌增大是在非洲克拉丽cat鱼中独立发生的几次。先前的研究表明，以下颌内收肌增大为特征的物种可能具有不寻常的觅食方式，例如陆地觅食和捕获猎物，以及经常在饮食中包括大量的硬地和陆生猎物。然而，对唇唇lab科属中内收肌肥大程度中等的物种知之甚少。在本研究中，我们提供了Clariallabes，C的一个鲜为人知的物种的各种样本的头部大小和饮食数据。我们的数据表明，该物种和先前研究的长梭菌的生长方式在某些方面相似（例如，颌骨肌肉生长的正向异形体），但在其他方面却不同（在舌骨宽度上为负异形体）。 .melas在所有尺寸上均具有较小的头部。由于我们遇到大量空腹，饮食数据仍然是初步的，但建议饮食包括硬性和软性食物。我们的数据表明，即使在相关物种和具有相关性的物种中，头部形状也可能存在大量变异颌骨内收肌肥大通常在颌骨内收肌及其相关结构的生长中表现出正异构关系。颌骨肌肉肥大是否是克拉丽ari鱼的一种适应性状，有待进一步的比较分析测试，以探讨颌骨内收肌肥大与硬猎物被包括在内的进化关系。饮食。

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